\r\n\tmetallurgies, leading to satisfy growing demand for non-ferrous materials and leading to improvements in environmental issues. This book will offer, for that reason, a wide vision of the non-ferrous mineral processing and metallurgy.
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Fernández-Luque",slug:"francisco-j.-fernandez-luque"}]},{id:"12472",title:"Monitoring of Human Movements for Fall Detection and Activities Recognition in Elderly Care Using Wireless Sensor Network: a Survey",slug:"monitoring-of-human-movements-for-fall-detection-and-activities-recognition-in-elderly-care-using-wi",signatures:"Stefano Abbate, Marco Avvenuti, Paolo Corsini, Janet Light and Alessio Vecchio",authors:[{id:"14025",title:"MSc.",name:"Stefano",middleName:null,surname:"Abbate",fullName:"Stefano Abbate",slug:"stefano-abbate"},{id:"15973",title:"Prof.",name:"Marco",middleName:null,surname:"Avvenuti",fullName:"Marco Avvenuti",slug:"marco-avvenuti"},{id:"15974",title:"Prof.",name:"Paolo",middleName:null,surname:"Corsini",fullName:"Paolo Corsini",slug:"paolo-corsini"},{id:"15975",title:"PhD.",name:"Alessio",middleName:null,surname:"Vecchio",fullName:"Alessio Vecchio",slug:"alessio-vecchio"},{id:"15976",title:"Prof.",name:"Janet",middleName:null,surname:"Light",fullName:"Janet Light",slug:"janet-light"}]},{id:"12473",title:"Odor Recognition and Localization Using Sensor Networks",slug:"odor-recognition-and-localization-using-sensor-networks",signatures:"Rabie Ramadan",authors:[{id:"13612",title:"Dr.",name:"Rabie",middleName:null,surname:"Ramadan",fullName:"Rabie Ramadan",slug:"rabie-ramadan"}]},{id:"12474",title:"Modelling Underwater Wireless Sensor Networks",slug:"modelling-underwater-wireless-sensor-networks",signatures:"Jesus Antonio Llor Sirvent and Manuel Perez Malumbres",authors:[{id:"13934",title:"Dr.",name:"Jesus Antonio",middleName:null,surname:"Llor Sirvent",fullName:"Jesus Antonio Llor Sirvent",slug:"jesus-antonio-llor-sirvent"},{id:"15622",title:"Dr.",name:"Manuel",middleName:null,surname:"Perez Malumbres",fullName:"Manuel Perez Malumbres",slug:"manuel-perez-malumbres"}]},{id:"12475",title:"Prospects and Problems of Optical Diffuse Wireless Communication for Underwater Wireless Sensor Networks",slug:"prospects-and-problems-of-optical-diffuse-wireless-communication-for-underwater-wireless-sensor-netw",signatures:"Davide Anguita, Davide Brizzolara and Giancarlo Parodi",authors:[{id:"15658",title:"Dr.",name:"Davide",middleName:null,surname:"Brizzolara",fullName:"Davide Brizzolara",slug:"davide-brizzolara"}]},{id:"12476",title:"Estimation of Propagation Characteristics along Random Rough Surface for Sensor Networks",slug:"estimation-of-propagation-characteristics-along-random-rough-surface-for-sensor-networks-",signatures:"Kazunori Uchida and Junichi Honda",authors:[{id:"15667",title:"Dr.",name:"Kazunori",middleName:null,surname:"Uchida",fullName:"Kazunori Uchida",slug:"kazunori-uchida"}]},{id:"12477",title:"Design of Radio-Frequency Transceivers for Wireless Sensor Networks",slug:"design-of-radio-frequency-transceivers-for-wireless-sensor-networks",signatures:"Bo Zhao and Huazhong Yang",authors:[{id:"14787",title:"Dr.",name:"Bo",middleName:null,surname:"Zhao",fullName:"Bo Zhao",slug:"bo-zhao"},{id:"14788",title:"Prof.",name:"Huazhong",middleName:null,surname:"Yang",fullName:"Huazhong Yang",slug:"huazhong-yang"}]},{id:"12478",title:"MAC & Mobility In Wireless Sensor Networks",slug:"mac-mobility-in-wireless-sensor-networks",signatures:"Marwan Al-jemeli, Fawnizu Hussin and Vooi Yap",authors:[{id:"13690",title:"MSc.",name:"Marwan",middleName:"Ihsan Shukur",surname:"Al-Jemeli",fullName:"Marwan Al-Jemeli",slug:"marwan-al-jemeli"},{id:"23990",title:"Prof.",name:"Vooi Voon",middleName:null,surname:"Yap",fullName:"Vooi Voon Yap",slug:"vooi-voon-yap"},{id:"23991",title:"Prof.",name:"Fawnizu",middleName:null,surname:"Hussin",fullName:"Fawnizu Hussin",slug:"fawnizu-hussin"}]},{id:"12479",title:"Hybrid Optical and Wireless Sensor Networks",slug:"hybrid-optical-and-wireless-sensor-networks",signatures:"Xiaoyin Li, Wei Pan, Jiangtao Liu, Zhen Zhang and Lianshan Yan",authors:[{id:"15623",title:"Dr.",name:"Lianshan",middleName:null,surname:"Yan",fullName:"Lianshan Yan",slug:"lianshan-yan"},{id:"15624",title:"Mr.",name:"Xiaoyin",middleName:null,surname:"Li",fullName:"Xiaoyin Li",slug:"xiaoyin-li"},{id:"15625",title:"Prof.",name:"Wei",middleName:null,surname:"Pan",fullName:"Wei Pan",slug:"wei-pan"},{id:"15626",title:"Ms.",name:"Jiangtao",middleName:null,surname:"Liu",fullName:"Jiangtao Liu",slug:"jiangtao-liu"},{id:"15627",title:"Mr.",name:"Zhen",middleName:null,surname:"Zhang",fullName:"Zhen Zhang",slug:"zhen-zhang"}]},{id:"12480",title:"Range-free Area Localization Scheme for Wireless Sensor Networks",slug:"range-free-area-localization-scheme-for-wireless-sensor-networks",signatures:"Vijay R. Chandrasekhar, Winston K.G. Seah, Zhi Ang Eu and Arumugam P. Venkatesh",authors:[{id:"45110",title:"Prof.",name:"Winston",middleName:null,surname:"Seah",fullName:"Winston Seah",slug:"winston-seah"}]},{id:"12481",title:"Data Fusion Approach for Error Correction in Wireless Sensor Networks",slug:"data-fusion-approach-for-error-correction-in-wireless-sensor-networks",signatures:"Maen Takruri and Subhash Challa",authors:[{id:"14529",title:"Prof.",name:"Subhash",middleName:null,surname:"Challa",fullName:"Subhash Challa",slug:"subhash-challa"},{id:"47261",title:"Prof.",name:"Maen",middleName:null,surname:"Takruri",fullName:"Maen Takruri",slug:"maen-takruri"}]},{id:"12482",title:"Target Tracking in Wireless Sensor Networks",slug:"target-tracking-in-wireless-sensor-networks",signatures:"Jianxun Li and Yan Zhou",authors:[{id:"15575",title:"Prof.",name:"Jianxun",middleName:null,surname:"Li",fullName:"Jianxun Li",slug:"jianxun-li"},{id:"15676",title:"Prof.",name:"Yan",middleName:null,surname:"Zhou",fullName:"Yan Zhou",slug:"yan-zhou"}]},{id:"12484",title:"Monitoring Wireless Sensor Network Performance by Tracking Node Operational Deviation",slug:"monitoring-wireless-sensor-network-performance-by-tracking-node-operational-deviation",signatures:"Yaqoob J. Y. Al-Raisi and Nazar E. M. Adam",authors:[{id:"15583",title:"Dr.",name:"Nazar",middleName:null,surname:"Elfadil",fullName:"Nazar Elfadil",slug:"nazar-elfadil"},{id:"27409",title:"Mr.",name:"Yaqoob",middleName:null,surname:"AL-Raeisi",fullName:"Yaqoob AL-Raeisi",slug:"yaqoob-al-raeisi"}]},{id:"12485",title:"Building Context Aware Network of Wireless Sensors Using a Scalable Distributed Estimation Scheme for Real-time Data Manipulation",slug:"building-context-aware-network-of-wireless-sensors-using-a-scalable-distributed-estimation-scheme-fo",signatures:"Amir Basirat and Asad I. Khan",authors:[{id:"15812",title:"Dr.",name:"Amir",middleName:null,surname:"Basirat",fullName:"Amir Basirat",slug:"amir-basirat"}]},{id:"12486",title:"Multimedia Data Processing and Delivery in Wireless Sensor Networks",slug:"multimedia-data-processing-and-delivery-in-wireless-sensor-networks-",signatures:"Javier Molina, Javier M. Mora-merchan, Julio Barbancho and Carlos Leon",authors:[{id:"496",title:"Dr.",name:"Carlos",middleName:null,surname:"Leon",fullName:"Carlos Leon",slug:"carlos-leon"},{id:"14634",title:"Dr.",name:"Javier M.",middleName:null,surname:"Mora-Merchan",fullName:"Javier M. Mora-Merchan",slug:"javier-m.-mora-merchan"},{id:"15604",title:"Prof.",name:"Javier",middleName:null,surname:"Molina",fullName:"Javier Molina",slug:"javier-molina"},{id:"15605",title:"PhD.",name:"Julio",middleName:null,surname:"Barbancho",fullName:"Julio Barbancho",slug:"julio-barbancho"}]},{id:"12487",title:"Imaging in UWB Sensor Networks",slug:"imaging-in-uwb-sensor-networks",signatures:"Ole Hirsch, Rudolf Zetik and Reiner Thomä",authors:[{id:"14629",title:"Dr.",name:"Ole",middleName:null,surname:"Hirsch",fullName:"Ole Hirsch",slug:"ole-hirsch"},{id:"14630",title:"Dr.",name:"Rudolf",middleName:null,surname:"Zetik",fullName:"Rudolf Zetik",slug:"rudolf-zetik"},{id:"14632",title:"Prof.",name:"Reiner",middleName:null,surname:"Thomä",fullName:"Reiner Thomä",slug:"reiner-thoma"}]}]}]},onlineFirst:{chapter:{type:"chapter",id:"70813",title:"Triboelectric Nanogenerators: Design, Fabrication, Energy Harvesting, and Portable-Wearable Applications",doi:"10.5772/intechopen.90951",slug:"triboelectric-nanogenerators-design-fabrication-energy-harvesting-and-portable-wearable-applications",body:'In the last few decades, the boom in consumer electronics rapidly creates the need for a sustainable portable and wearable power source. There are too many low-power electronic devices that are introduced to enhance the quality of our life, such as sensors, communication devices, GPS devices, implantable, and health monitoring devices [1, 2, 3, 4]. All these electronic gadgets require electric power in the range of few microwatts to milliwatts. With the invention of batteries, these devices can use in various portable applications. However, the drawback in batteries limits the purpose and be an obstacle to miniaturize the sensors. As per the batteries in concern, the batteries require periodical replacement, and the recycling of batteries is still a significant challenge. The precursor used for the fabrication of the batteries is highly hazards to human life and creates pollution to the environment [5]. The disposal has many concerns regarding soil and water contamination as they contain a lot of heavy metals. The future of electronics depends on the portable and wearable sensors such as flexible electronics [6, 7], e-skin-based sensor devices [8], and implantable bio-medical electronic systems [9]. Operating the low-power electronic devices, a sustainable and highly reliable power source is required. The power sources should scavenge power from waste mechanical energy. The majority of energy that we consume today is from many nonrenewable sources such as thermal power plants that operate on coal, and diesel power plants operating with the help of oil. These natural resources are limited in supply, and it takes thousands of years to regenerate. The usage of fossil fuels such as coal and oil in the generation of electricity creates massive pollution, and it leads to the reduction of life span to humans. To overcome this issue, an alternative energy harvesting approach had been introduced across the globe to protect humanity and overcome the growing energy crisis.
The conventional approach to generate electrical energy is by using an electromagnetic generator (EMG). These generators harvest effectively under the high frequency of mechanical energy inputs [10]. However, there is an abundant low-frequency mechanical energy around the globe as well as from various sources such as vibration, wind, water wave, human motions, and vehicle motions. These low-frequency motions cannot be harvested effectively using an EMG. The solution to this problem addressed in 2006 with the invention of nanogenerators (NGs) [11]. The NGs with various classifications and effects such as piezoelectric nanogenerator (PNG) [12, 13, 14, 15], triboelectric nanogenerator (TENG) [16], thermoelectric generator (TEG) [17], and pyroelectric generator (PYG) [18] had been introduced in the past decades for a variety of energy harvesting and self-powered applications.
Furthermore, the energy harvesters are performing some real-time applications by integrating it with battery or other storage devices. Apart from energy harvesting, these NG can work as a self-powered sensors such as pH sensors [19], glucose sensors [20], chemical sensors [21], humidity sensors [22, 23], temperature sensors [24], air pressure sensors [25], motion sensor [26], optical sensor [27, 28], and strain sensors [29]. To enhance the output power of the TENG devices, researchers across the globe performed the hybridization of these devices and studied the possibility of its use in extensive applications. To be used for a wide range of applications, TENG-PENG [30] hybrid had been reported with high instantaneous power density. Similarly, there are many reports for scavenging the water wave energy by TENG-EMG hybrid configuration [31]. The generated output is much higher and can use for GPS tracking and positioning system. A similar concept is demonstrating by using magnetic particles instead of magnets in the EMG component [32]. The motion of particles activates the triboelectric part of the hybrid device. The issues that TENGs have faced so far are its bio-compatibility, performance reduction concerning humidity. The problems rectified by introducing a biodegradable, edible TENG [33], and a fully packed water-resistant TENG. The fully packed TENG [34] can protect the device from humidity issues and maintains its performance for a more extended period. The further advancements in NGs lead to the design of flexible electronic-skin-based devices for sensing various parameters, microfluidic-based devices [35], and other portable-wearable devices making NGs a sustainable power source. This chapter covers the basics of TENG, fundamental working modes of TENG and fabrication, and energy harvesting and its application in portable and wearable technologies.
The mechanism behind TENG is triboelectrification and electrostatic induction effects; with the rapid advancement in the field of nanogenerators and TENG, the exploration leads to the investigation of fundamental working modes of TENG, which covers four basic modes. The modes include a vertical contact separation mode, linear sliding mode, single-electrode mode, and free-standing mode. These modes require two different triboelectric materials with proper electrode connections with proper insulation between each layer. The combination may be either dielectric-dielectric or metal-dielectric arrangements. The basic principle behind all the four modes is that whenever there is a displacement in any of the triboelectric layers, the electrostatic charge movements break the electrostatic status present, leading to the development of potential difference between the electrodes. In the repeated mechanical actuation of layers with forward and reverse direction makes the triboelectric layer to generate forward and reverse potential between the electrodes, making the positive and negative peaks in the TENG output generating the AC signal. The four different working modes are shown schematically in Figure 1.
Schematic representation of the four fundamental operating modes of TENG.
In the contact separation mode TENG, the triboelectrification occurs by the contact and separation process of two triboelectric materials or layers, as shown in Figure 1a. The process may either happen between two different dielectric materials or may be a dielectric and metallic layers. This model has a significant advantage with its simple design, easy fabrication, and low cost. This mode of TENG is also the first developed and demonstrated for powering low-power electronics. This mode of TENG can also make as a multi-unit stacking for the enhanced output performance.
In the linear sliding mode, the charge generation is by the relative to and from sliding between the layers of TENG. The construction is almost similar to the contact separation mode with electrodes attached to the back of the triboelectric layers, but the displacement is in sideward, as shown in Figure 1b. The sliding mode has a low figure-of-merits compared with the vertical contact separation mode due to its protracted displacement in the sliding process. The advantage of this mode is that it can generate more charge density with a highly effective charge generation due to its high contact area. Also, by introducing more grating structures, the output performance can be enhanced. The sliding mode TENG can also be able to operate rotationally with cylindrical grating structures.
The simplest structure of TENG is the single-electrode mode TENG, but the output performance is too low due to the small charge transfer, making the generated voltage and current to be less, but it is highly suitable for self-powered applications. The advantage of this device is that it overcomes the application limitation due to the contact wire obstructing at both sides in the contact separation mode and sliding mode TENG devices. The basic arrangement of a single-electrode mode TENG is shown in Figure 1c.
The free-standing model has one electrode move freely between the two electrodes or triboelectric layers. The electrodes are in a static position, and a triboelectric layer without electrode can move over it. This mode of TENG device has a high figure-of-merits and has demonstrated high output efficiency and electrical output. Also, this type of device can be fabricated easily and integrated into various real-time applications. The necessary arrangement of a single-electrode mode TENG is shown in Figure 1d.
After the invention of TENG in 2012, the field becomes an extensive investigated field with a vast number of researchers working and improving it until today [36]. The first developed TENG device is a contact separation mode device with kapton and polyester as the active layers [7]. Further investigation TENG leads to the invention of other modes in 2013 [37]. The research trend on NGs started moving forward from energy harvesting to self-powered sensing and actuation. The transparent and flexible nanogenerators were fabricated and tested in the later stage with the application in e-skin and tactile sensing. The researchers’ then working towards hybridizing the TENG with other energy harvesters such as PENG and EMG for scavenging wind and water wave energy efficiently and also had performed various real-time applications connected to environmental monitoring. Very recently, by adopting these explored TENG design and operation, liquid–solid interface TENGs and liquid–liquid TENGs had introduced for scavenging water droplet energy [38]. There had been a problem in TENGs and its electrical output concerning external factors such as temperature and humidity. Recently, the humidity issues got rectified by introducing a fully packed, waterproof TENG device by our group in 2019. In addition to biodegradable TENGs, an edible TENG made of regular food items was designed and fabricated by our group and demonstrated powering low-power electronic devices. Also, the first developed TENG device has a power density in the range of micro watts, and today, the device had reached the power density in watts. The increasing power density shows that the TENGs are reliable energy harvester and self-powered sensors which can able to commercialize shortly and to have a high possibility to replace batteries. Figure 2 shows the road map, explaining the advancement of TENGs for various applications.
Design and development of TENGs from its origin to date, with various device structures, applications, and performances.
The fabrication of a TENG device requires precise handling of the arrangement of triboelectric layers and electrodes. The improvement in the design of the TENG device is improving day-by-day. The triboelectric layer with a high surface roughness delivers high electrical output. The phenomenon is that the rough surfaces increase the contact points of the TENG device. Each micro/nano scale roughness interacts with the other triboelectric layer during its mechanical actuation. Therefore, the contact point multiplies the generated output as compared with the flat surface where the contact point is single. There are various approaches to creating surface roughness of the triboelectric layers, such as inductively coupled plasma etching, wet etching, lithographic technique, and casting. These techniques involve various advantages as well as disadvantages. The high-end lithographic and plasma etching techniques involve high-cost instruments and skilled operator, which is a disadvantage. There are various reports on simply creating surface roughness using cost-effective techniques such as using sandpaper as a mold. The sandpaper with more roughness as a mold for fabricating roughness created triboelectric layer, and the polymers such as PDMS and other silicon elastomer-based polymers poured on it, and with heat treatment, the polymer solution is then cured to form a polymeric film with microscale surface roughness. The other cost-effective technique reported is the surface modification of a used acrylonitrile butadiene styrene (ABS) polymer petri dish. The surface modification is done through wet etching using acetone as an etchant. The technique involves less time and a simple preparation process.
The ABS polymer petri dish is first washed with water and dipped in a beaker full of acetone for 90 s, as shown in Figure 3a, and the petri dish dried in an air atmosphere at room temperature. By this time, acetone etches the surface of the petri dish, creating micro-roughness on its surface, as shown in Figure 3b. The PDMS polymer is poured into the petri dish and cured in a hot air oven to get a polymeric film. Figure 3c–g shows the FE-SEM morphology of the surface of the PDMS polymer film made using roughness created petri dish mold. The petri dish with acetone treatment for a period of 90 s shows good roughness. Figure 3h shows the fabrication techniques involved in the fabrication of different micro or nanoscale surface roughness.
(a, b) Wet etching of an ABS polymer petri dish using acetone as an etchant and fabrication of mold. The PDMS monomer is then poured on the surface-etched mold and cured to form a roughness patterned PDMS film. (c–g) FE-SEM morphology showing the surface roughness of PDMS film cured in a petri dish with different acetone treated time and their corresponding surface roughness. (h) Fabrication techniques for micro/nanoscale surface roughness [39].
The primary purpose of a TENG device is that it can harvest mechanical energy from the environment. The mechanical energy can be in any form ranging from vibration, vehicle motion, and human body motion. To scavenge the biomechanical energy and use effectively for a variety of applications, an H-TENG and SS-TENG devices report the fabrication of wearable TENG and its performance to applications. Figure 4 shows the H-TENG device and its electrical performances with the application of an emergency exit system. The H-TENG device made up of polymeric materials by collecting the polymeric waste materials from the house garbage bin, as shown in Figure 4a. The positive material is cooking aluminum foil, and the harmful triboelectric materials are random plastics, and the spacer material is the utensil cleaning sponge. The entire TENG device made of household waste shows its easy fabrication and competitive cost development process. The layer-by-layer schematic of H-TENG is shown in Figure 4b. The statistics of plastic wastes generated and creating adverse effect to the environment is shown in Figure 4c. The device works on vertical contact separation mode, as shown in Figure 4d. The device successfully used for scavenging waste mechanical energy from the human finger, palm, hand, and leg motions, as shown in Figure 4e with their corresponding electrical response. The electrical output of the H-TENG device made of various polymers was measured in the laboratory using a linear motor, and their corresponding voltage and current responses are shown in Figure 4f. The devices were constantly powering at a maximum of 20 V/300 nA response. At last, the fabricated H-TENG device was used for an emergency exit LED lighting system, indicating the exit direction, as shown in Figure 4g.
(a) Fabrication materials of TENG device using recycled waste polymer wrappers from household things. (b) Schematic of the household H-TENG device. (c) Statistics of generated plastic waste all over the world. (d) Contact-separation working mechanism of H-TENG device. (e) Scavenging waste mechanical energy from H-TENG device. (f) Voltage and current response of the H-TENG devices made with different type of polymers. (g) Applications of H-TENG device showing the emergency exit with LED indication [40].
In a similar approach, an SS-TENG device fabricated for scavenging biomechanical energy by placing it on the seating chair. The whole process of SS-TENG from the schematic, electrical response and applications are shown in Figure 5. The device consists of interdigitated electrodes (IDE) made of aluminum is attached to the bottom side of a Kapton film. The kapton film acts as a negative triboelectric layer, and the contact materials were bus cards, polyethylene cover, jeans cloth, and newspaper. The schematic of the SS-TENG device is shown in Figure 5a. The SS-TENG device works on a single-electrode mode triboelectrification. The working mechanism of SS-TENG device with single-electrode mode configuration is shown in Figure 5b. Figure 5c shows the electrical output response of the device showing a maximum power of 6.5 μW at 10 MΩ resistance. The device also has high stability power continuously for 2000 s without variation in the electrical response. The device is then placed in the pant pocket and measured the electrical response under walking, running, and sitting mechanical motions.
(a) Schematic of SS-TENG device showing different layers and the logic circuit used for powering electronic displays and LEDs. (b) Working mechanism of SS-TENG device operating with single-electrode mode. (c) Electrical response of SS-TENG and its application as a smart seat [41].
Besides scavenging biomechanical energy, TENGs can also use as a portable-wearable power sources. By making a design suitable for a portable and wearable process utilizing the appropriate working mode, TENGs can then be used for the mentioned applications. Many researchers have been working on textile-based nanogenerators for wearable applications. These devices use bio-compatible materials as triboelectric layers with the content of fabrics and making it suitable for wearable applications. The advancement in the wearable TENGs can be able to use as a wearable sensor as well as be used as a health monitoring device also. The chapter discusses a smart mobile pouch TENG (SMP-TENG) showing the portable quality of the TENG device. Along with that, a smart backpack TENG (SBP-TENG) demonstrates the energy harvesting and the wearable part.
The SMP-TENG works on the wearable part with the sliding mode. The polymeric layer made of kapton was deposited with the IDE electrode and attached in the mobile phone, which interacts with the triboelectric layer (contact materials) on the mobile pouch. The contact materials tested here are polyester, jeans, cotton, and nylon. Figure 6a shows the schematic of the SMP-TENG device with IDE electrode and contact materials. The working mechanism of SMP-TENG is sliding mode, with the contact materials slides over the kapton layer, as shown in Figure 6b. Figure 6c shows the electrical response of the device with contact materials. Among the four different contact materials, nylon generates a high electrical output of 150 V and 305 μA. Also, the SMP-TENG device was used to transfer the generated electrical output wirelessly using transmitter and receiver antennas.
(a) Schematic of a smart mobile pouch TENG device. (b) Working mechanism of SMP-TENG device operating in a free-standing triboelectrification mode. (c) Electrical response of SMP-TENG using various contact materials [42].
Similarly, an SBP-TENG device also fabricated with the free-standing triboelectric made and attached to the commercial backpack. The free-standing layer here is the fabric that we wear every day. The device performance got tested with various fabric materials such as polyethylene, jeans, cloth, cotton, paper, and wool. A multi-unit SBP-TENG was constructed and attached continuously in the backpack as four units. The four devices connected in parallel electrical connection. Figure 7a shows the four TENG units connected in parallel, and the inset shows the backpack with TENG devices attached on the backside.
(a–e) Electrical response of SBP-TENG device showing its electrical response under parallel connections with four units. (f) Cyclic stability study by charging and discharging a 1 μF capacitor. (g) Emergency LED flash using a switch and a capacitor. (h and i) Electrical response of SBP-TENG with various contact materials and the maximum response obtained with wool. (j and k) Voltage and current responses of SBP-TENG with wool. (l–n) The electrical response of SBP-TENG under biomechanical motions such as walking, running, and bending [39].
Figure 7b shows the electrical response of the device concerning the number of units connected in parallel. The voltage remains constant, and the current of the devices increases every fold with the addition of devices in parallel connection. Figure 7c,d shows the capacitor charging performance to increase in the TENG device under a parallel connection. The charging performance also increases, which is due to the high current with the increase in the number of devices. The electrical response for the weight of the bag is shown in Figure 7e. When the weight of the bag increases, the motion of the bag would be restricted; therefore, the electrical output of the device would decrease. The LED is flashed, as shown in Figure 7f and g, with the help of a capacitor and a switch. Whenever the bag moves, the capacitor gets charges due to the actuation of the TENG device; during the emergency times, the switch would be operated to give a flashlight.
Figure 7f shows the capacitor charging and discharging with the switch ON and OFF. The electrical response of the device under various contact materials is given in Figure 7h and i, where the wool as contact materials shows high output with the voltage of 250 V peak-to-peak and the current of 12 μA. Figure 7j and k shows the voltage and current response of wool material with the peak pattern. The force analysis of SBP-TENG at different weights of the backpack and their respective electrical responses are shown in Figure 7l and m. Finally, the real-time electrical response is shown in Figure 7n with the backpack worn by a person, and the electrical response was monitored under various biomechanical motions such as walking, running, and bending. The devices show pleasant repose under the different mechanical motions proving that the SBP-TENG is a promising candidate for scavenging biomechanical energy and for being used under emergencies.
Very recently, researchers were taken a step towards the easy commercialization of TENG in a new way by making it a direct commercial product. TENGs have made as a toy which can make the children not to get addicted to electronic gadgets. The researchers have shown that the TENG could be made as a toy and sell it as a commercial product. As an idea, TENGs packed with various toys such as clapping toys, duck toys, puzzles, and computer mouse. The clapping toy makes a clapping sound, in which the contact and separation triboelectric layers were introduced between the clapping layers of the clapping toys.
The generated electric power was used to lit up green LEDs, as shown in Figure 8a. Figure 8b shows the puzzle TENG. A free-standing device made of PDMS and aluminum was attached to the puzzle board. The puzzle pieces have the other contact material, and the positions are kept different in each piece. The right piece can match with the other triboelectric layer, which placed on the exact matching area on the puzzle board. Whenever the correct piece matches, the liquid crystal display (LCD) shows “C” indicating “correct” in its display. The smart duck toy usually makes noise upon pressing its middle part. The similar concept used here by placing a TENG device placed in the middle of the duck toy connected with two LEDs in the eye portion, as shown in Figure 8c. The smart computer mouse uses a sliding mode triboelectrification with IDE electrodes attached to the bottom of the mouse and slides over various contact materials used in the mouse pad. This device glows a few LEDs, lit up an LCD, and charges a Li-ion battery. The improvement of the device makes the mouse work without battery power source: the schematic and electrical response of the smart mouse TENG as shown in Figure 8d.
(a) Schematic and device fabrication of a smart clapping toy TENG. (b) Schematic and operation of a smart puzzle TENG. (c) Schematic of a smart toy TENG. (d) Schematic and electrical response of smart mouse TENG [43, 44].
Biodegradable and edible TENGs have recently been fabricated using edible materials. This approach utilizes the TENGs for implantable applications without being toxic to the human body and the environment. In general, TENG devices made of triboelectric materials, which are either polymer or metals. They usually create pollution in various ways depends on the toxicity levels and properties of the materials used. This section of the book shows an edible TENG made of laver (seaweed) as a triboelectric layer and an edible silver foil as an electrode. The triboelectric layer and electrode were attached to a rice sheet, which acts as a substrate for the active layer. Figure 9a–e shows the step-by-step fabrication process of an edible TENG device with its various layers. The TENG operated under a single-electrode mode and contacted day-to-day usage materials such as paper, tissue paper, polyvinyl chloride (PVC), and fluorinated ethylene propylene (FEP). The toxicity level and biocompatibility of the edible TENG device tested with 3-(4,5-dimethylthiazol-2-yl)-2,5-diphenyl tetrazolium bromide (MTT) assay, cell imaging, and 4′,6-diamidino-2-phenylindole (DAPI). The results prove that the triboelectric layer is biocompatible and allows the cells to grow on it. The cell growth that verifies under a confocal microscope and the imaging shows a blue color pattern in Figure 9f. Figure 9g demonstrates the real-time application of powering various electronic components such as a hygrometer, wristwatch, and LEDs using a capacitor and a switch. The electrical response and stability of the edible TENG device are shown in Figure 9h with the maximum output response, with its interaction with FEP. The results prove that the edible TENG is highly suitable for implantable devices and also in the applications related to biomedical electronics.
(a–e) Fabrication of edible TENG device using laver as triboelectric layer and silver foil as an electrode with a rice sheet as a substrate. (f) MTT assay and cell viability test. (g) Powering up various electronic devices. (h) Electrical response analysis and stability test of the edible TENG device [45].
There are several drawbacks of TENG devices overcome by introducing various solutions, techniques, and fabrication designs. The major drawback that TENGs are facing from the day of its invention is that its electrical performance had affected under humidity. Recently, this issue had overcome by introducing a fully packed, waterproof TENG (WP-TENG) device where it can work even underwater as well as in high humidity. Figure 9 shows the schematic of a fully packed WP-TENG and its electrical response. The device made of nickel foam as a positive triboelectric layer, and roughness created PDMS as a negative triboelectric layer, as shown in Figure 10a, and the FE-SEM shows the layers in microscale in Figure 10b–d. The device was packed on either side with a polymer casing and sealed using a pouch laminator, as shown in Figure 10e. The device is extremely lightweight and weighs around 1.9 g, which is shown in Figure 10f. The waterproof ability of the device is tested by dipping the device underwater and is shown in Figure 10g. The device shows an excellent electrical response of 80 V and a maximum instantaneous power density of 4 mW/m2. The water resistance capability of the device is shown in Figure 10j in which the device submerged into the water for a period of 24 h, and the corresponding response in between the intervals is measured. The response was stable for the entire time without affecting its performance. The electrical response and performance of the device are shown in Figure 10h–j. The electrical response to humidity is measured using a homemade humidity chamber, and the device was tested with the application of various percentages of relative humidity. The output is stable from 0% RH to 90% RH. Figure 10k–m shows the electrical response of humidity studies and the homemade chamber used. This study of WP-TENG shows that the device is capable of using in harsh and humid weather and environmental conditions.
(a) Schematic and layers of waterproof TENG device. (b–d) FESEM image showing the cross-section of WP-TENG device with both the layers, morphology of nickel foam and roughness PDMS. (e) Fully packed device. (f) Lightweight device weight. (g) Waterproof capability. (h) Load resistance vs. power density analysis. (i) Rectified voltage. (j) Water-resistant analysis with different time duration (k and l) humidity with output analysis. (m) Homemade humidity chamber for the analysis [34].
In summary, the development of TENG as a sustainable, portable, and wearable power source focuses on the trend of miniaturization, energy harvesting, and self-powered electronics. The rapid advancement of energy harvesting using nanogenerators brought the possibility to power electronic devices from the waste mechanical energy in the environment. The development of TENG has reached to the bulk and scalable fabrication and started to get commercialized. Further advancement in TENG as flexible construction would be easier to harvest day-to-day mechanical energy from human motions. The construction of TENGs as a flexible power source would pave the way towards a more reliable and sustainable power source and the possibility to replace the battery shortly.
This work was supported by the Basic Science Research Program through the National Research Foundation of Korea (NRF) grant funded by the Korean Government (MSIT) (2018R1A4A1025998, 2019R1A2C3009747).
The authors declare no conflict of interest.
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El-Hemaly\nProfessor OB/GYN & Urogynecology\nFaculty of medicine, Al-Azhar University \nPersonal Information: \nMarried with two children\nWife: Professor Laila A. Moussa MD.\nSons: Mohamad A. M. El-Hemaly Jr. MD. Died March 25-2007\nMostafa A. M. El-Hemaly, Computer Scientist working at Microsoft Seatle, USA. \nQualifications: \n1.\tM.B.-Bch Cairo Univ. June 1963. \n2.\tDiploma Ob./Gyn. Cairo Univ. April 1966. \n3.\tDiploma Surgery Cairo Univ. Oct. 1966. \n4.\tMRCOG London Feb. 1975. \n5.\tF.R.C.S. Glasgow June 1976. \n6.\tPopulation Study Johns Hopkins 1981. \n7.\tGyn. Oncology Johns Hopkins 1983. \n8.\tAdvanced Laparoscopic Surgery, with Prof. Paulson, Alexandria, Virginia USA 1993. \nSocieties & Associations: \n1.\t Member of the Royal College of Ob./Gyn. London. \n2.\tFellow of the Royal College of Surgeons Glasgow UK. \n3.\tMember of the advisory board on urogyn. FIGO. \n4.\tMember of the New York Academy of Sciences. \n5.\tMember of the American Association for the Advancement of Science. \n6.\tFeatured in �Who is Who in the World� from the 16th edition to the 20th edition. \n7.\tFeatured in �Who is Who in Science and Engineering� in the 7th edition. \n8.\tMember of the Egyptian Fertility & Sterility Society. \n9.\tMember of the Egyptian Society of Ob./Gyn. \n10.\tMember of the Egyptian Society of Urogyn. \n\nScientific Publications & Communications:\n1- Abdel Karim M. El Hemaly*, Ibrahim M. Kandil, Asim Kurjak, Ahmad G. Serour, Laila A. S. Mousa, Amr M. Zaied, Khalid Z. El Sheikha. \nImaging the Internal Urethral Sphincter and the Vagina in Normal Women and Women Suffering from Stress Urinary Incontinence and Vaginal Prolapse. Gynaecologia Et Perinatologia, Vol18, No 4; 169-286 October-December 2009.\n2- Abdel Karim M. El Hemaly*, Laila A. S. Mousa Ibrahim M. Kandil, Fatma S. El Sokkary, Ahmad G. Serour, Hossam Hussein.\nFecal Incontinence, A Novel Concept: The Role of the internal Anal sphincter (IAS) in defecation and fecal incontinence. Gynaecologia Et Perinatologia, Vol19, No 2; 79-85 April -June 2010.\n3- Abdel Karim M. El Hemaly*, Laila A. S. Mousa Ibrahim M. Kandil, Fatma S. El Sokkary, Ahmad G. Serour, Hossam Hussein.\nSurgical Treatment of Stress Urinary Incontinence, Fecal Incontinence and Vaginal Prolapse By A Novel Operation \n"Urethro-Ano-Vaginoplasty"\n Gynaecologia Et Perinatologia, Vol19, No 3; 129-188 July-September 2010.\n4- Abdel Karim M. El Hemaly*, Ibrahim M. Kandil, Laila A. S. Mousa and Mohamad A.K.M.El Hemaly.\nUrethro-vaginoplasty, an innovated operation for the treatment of: Stress Urinary Incontinence (SUI), Detursor Overactivity (DO), Mixed Urinary Incontinence and Anterior Vaginal Wall Descent. \nhttp://www.obgyn.net/urogyn/urogyn.asp?page=/urogyn/articles/ urethro-vaginoplasty_01\n\n5- Abdel Karim M. El Hemaly, Ibrahim M Kandil, Mohamed M. Radwan.\n Urethro-raphy a new technique for surgical management of Stress Urinary Incontinence.\nhttp://www.obgyn.net/urogyn/urogyn.asp?page=/urogyn/articles/\nnew-tech-urethro\n\n6- Abdel Karim M. El Hemaly, Ibrahim M Kandil, Mohamad A. Rizk, Nabil Abdel Maksoud H., Mohamad M. Radwan, Khalid Z. El Shieka, Mohamad A. K. M. El Hemaly, and Ahmad T. El Saban.\nUrethro-raphy The New Operation for the treatment of stress urinary incontinence, SUI, detrusor instability, DI, and mixed-type of urinary incontinence; short and long term results. \nhttp://www.obgyn.net/urogyn/urogyn.asp?page=urogyn/articles/\nurethroraphy-09280\n\n7-Abdel Karim M. El Hemaly, Ibrahim M Kandil, and Bahaa E. El Mohamady. Menopause, and Voiding troubles. \nhttp://www.obgyn.net/displayppt.asp?page=/English/pubs/features/presentations/El-Hemaly03/el-hemaly03-ss\n\n8-El Hemaly AKMA, Mousa L.A. Micturition and Urinary\tContinence. Int J Gynecol Obstet 1996; 42: 291-2. \n\n9-Abdel Karim M. El Hemaly.\n Urinary incontinence in gynecology, a review article.\nhttp://www.obgyn.net/urogyn/urogyn.asp?page=/urogyn/articles/abs-urinary_incotinence_gyn_ehemaly \n\n10-El Hemaly AKMA. Nocturnal Enuresis: Pathogenesis and Treatment. \nInt Urogynecol J Pelvic Floor Dysfunct 1998;9: 129-31.\n \n11-El Hemaly AKMA, Mousa L.A.E. Stress Urinary Incontinence, a New Concept. Eur J Obstet Gynecol Reprod Biol 1996; 68: 129-35. \n\n12- El Hemaly AKMA, Kandil I. M. Stress Urinary Incontinence SUI facts and fiction. Is SUI a puzzle?! http://www.obgyn.net/displayppt.asp?page=/English/pubs/features/presentations/El-Hemaly/el-hemaly-ss\n\n13-Abdel Karim El Hemaly, Nabil Abdel Maksoud, Laila A. Mousa, Ibrahim M. Kandil, Asem Anwar, M.A.K El Hemaly and Bahaa E. El Mohamady. \nEvidence based Facts on the Pathogenesis and Management of SUI. http://www.obgyn.net/displayppt.asp?page=/English/pubs/features/presentations/El-Hemaly02/el-hemaly02-ss\n\n14- Abdel Karim M. El Hemaly*, Ibrahim M. Kandil, Mohamad A. Rizk and Mohamad A.K.M.El Hemaly.\n Urethro-plasty, a Novel Operation based on a New Concept, for the Treatment of Stress Urinary Incontinence, S.U.I., Detrusor Instability, D.I., and Mixed-type of Urinary Incontinence.\nhttp://www.obgyn.net/urogyn/urogyn.asp?page=/urogyn/articles/urethro-plasty_01\n\n15-Ibrahim M. Kandil, Abdel Karim M. El Hemaly, Mohamad M. Radwan: Ultrasonic Assessment of the Internal Urethral Sphincter in Stress Urinary Incontinence. The Internet Journal of Gynecology and Obstetrics. 2003. Volume 2 Number 1. \n\n\n16-Abdel Karim M. El Hemaly. Nocturnal Enureses: A Novel Concept on its pathogenesis and Treatment.\nhttp://www.obgyn.net/urogynecolgy/?page=articles/nocturnal_enuresis\n\n17- Abdel Karim M. El Hemaly. Nocturnal Enureses: An Update on the pathogenesis and Treatment.\nhttp://www.obgyn.net/urogynecology/?page=/ENHLIDH/PUBD/FEATURES/\nPresentations/ Nocturnal_Enuresis/nocturnal_enuresis\n\n18-Maternal Mortality in Egypt, a cry for help and attention. The Second International Conference of the African Society of Organization & Gestosis, 1998, 3rd Annual International Conference of Ob/Gyn Department � Sohag Faculty of Medicine University. Feb. 11-13. Luxor, Egypt. \n19-Postmenopausal Osteprosis. The 2nd annual conference of Health Insurance Organization on Family Planning and its role in primary health care. Zagaziz, Egypt, February 26-27, 1997, Center of Complementary Services for Maternity and childhood care. \n20-Laparoscopic Assisted vaginal hysterectomy. 10th International Annual Congress Modern Trends in Reproductive Techniques 23-24 March 1995. Alexandria, Egypt. \n21-Immunological Studies in Pre-eclamptic Toxaemia. Proceedings of 10th Annual Ain Shams Medical Congress. Cairo, Egypt, March 6-10, 1987. \n22-Socio-demographic factorse affecting acceptability of the long-acting contraceptive injections in a rural Egyptian community. Journal of Biosocial Science 29:305, 1987. \n23-Plasma fibronectin levels hypertension during pregnancy. The Journal of the Egypt. Soc. of Ob./Gyn. 13:1, 17-21, Jan. 1987. \n24-Effect of smoking on pregnancy. Journal of Egypt. Soc. of Ob./Gyn. 12:3, 111-121, Sept 1986. \n25-Socio-demographic aspects of nausea and vomiting in early pregnancy. Journal of the Egypt. Soc. of Ob./Gyn. 12:3, 35-42, Sept. 1986. \n26-Effect of intrapartum oxygen inhalation on maternofetal blood gases and pH. Journal of the Egypt. Soc. of Ob./Gyn. 12:3, 57-64, Sept. 1986. \n27-The effect of severe pre-eclampsia on serum transaminases. The Egypt. J. Med. Sci. 7(2): 479-485, 1986. \n28-A study of placental immunoreceptors in pre-eclampsia. The Egypt. J. Med. Sci. 7(2): 211-216, 1986. \n29-Serum human placental lactogen (hpl) in normal, toxaemic and diabetic pregnant women, during pregnancy and its relation to the outcome of pregnancy. Journal of the Egypt. Soc. of Ob./Gyn. 12:2, 11-23, May 1986. \n30-Pregnancy specific B1 Glycoprotein and free estriol in the serum of normal, toxaemic and diabetic pregnant women during pregnancy and after delivery. Journal of the Egypt. Soc. of Ob./Gyn. 12:1, 63-70, Jan. 1986. Also was accepted and presented at Xith World Congress of Gynecology and Obstetrics, Berlin (West), September 15-20, 1985. \n31-Pregnancy and labor in women over the age of forty years. Accepted and presented at Al-Azhar International Medical Conference, Cairo 28-31 Dec. 1985. \n32-Effect of Copper T intra-uterine device on cervico-vaginal flora. Int. J. Gynaecol. Obstet. 23:2, 153-156, April 1985. \n33-Factors affecting the occurrence of post-Caesarean section febrile morbidity. Population Sciences, 6, 139-149, 1985. \n34-Pre-eclamptic toxaemia and its relation to H.L.A. system. Population Sciences, 6, 131-139, 1985. \n35-The menstrual pattern and occurrence of pregnancy one year after discontinuation of Depo-medroxy progesterone acetate as a postpartum contraceptive. Population Sciences, 6, 105-111, 1985. \n36-The menstrual pattern and side effects of Depo-medroxy progesterone acetate as postpartum contraceptive. Population Sciences, 6, 97-105, 1985. \n37-Actinomyces in the vaginas of women with and without intrauterine contraceptive devices. Population Sciences, 6, 77-85, 1985. \n38-Comparative efficacy of ibuprofen and etamsylate in the treatment of I.U.D. menorrhagia. Population Sciences, 6, 63-77, 1985. \n39-Changes in cervical mucus copper and zinc in women using I.U.D.�s. Population Sciences, 6, 35-41, 1985. \n40-Histochemical study of the endometrium of infertile women. Egypt. J. Histol. 8(1) 63-66, 1985. \n41-Genital flora in pre- and post-menopausal women. Egypt. J. Med. Sci. 4(2), 165-172, 1983. \n42-Evaluation of the vaginal rugae and thickness in 8 different groups. Journal of the Egypt. Soc. of Ob./Gyn. 9:2, 101-114, May 1983. \n43-The effect of menopausal status and conjugated oestrogen therapy on serum cholesterol, triglycerides and electrophoretic lipoprotein patterns. Al-Azhar Medical Journal, 12:2, 113-119, April 1983. \n44-Laparoscopic ventrosuspension: A New Technique. Int. J. Gynaecol. Obstet., 20, 129-31, 1982. \n45-The laparoscope: A useful diagnostic tool in general surgery. Al-Azhar Medical Journal, 11:4, 397-401, Oct. 1982. \n46-The value of the laparoscope in the diagnosis of polycystic ovary. Al-Azhar Medical Journal, 11:2, 153-159, April 1982. \n47-An anaesthetic approach to the management of eclampsia. Ain Shams Medical Journal, accepted for publication 1981. \n48-Laparoscopy on patients with previous lower abdominal surgery. Fertility management edited by E. Osman and M. Wahba 1981. \n49-Heart diseases with pregnancy. Population Sciences, 11, 121-130, 1981. \n50-A study of the biosocial factors affecting perinatal mortality in an Egyptian maternity hospital. Population Sciences, 6, 71-90, 1981. \n51-Pregnancy Wastage. Journal of the Egypt. Soc. of Ob./Gyn. 11:3, 57-67, Sept. 1980. \n52-Analysis of maternal deaths in Egyptian maternity hospitals. Population Sciences, 1, 59-65, 1979. \nArticles published on OBGYN.net: \n1- Abdel Karim M. El Hemaly*, Ibrahim M. Kandil, Laila A. S. Mousa and Mohamad A.K.M.El Hemaly.\nUrethro-vaginoplasty, an innovated operation for the treatment of: Stress Urinary Incontinence (SUI), Detursor Overactivity (DO), Mixed Urinary Incontinence and Anterior Vaginal Wall Descent. \nhttp://www.obgyn.net/urogyn/urogyn.asp?page=/urogyn/articles/ urethro-vaginoplasty_01\n\n2- Abdel Karim M. El Hemaly, Ibrahim M Kandil, Mohamed M. Radwan.\n Urethro-raphy a new technique for surgical management of Stress Urinary Incontinence.\nhttp://www.obgyn.net/urogyn/urogyn.asp?page=/urogyn/articles/\nnew-tech-urethro\n\n3- Abdel Karim M. El Hemaly, Ibrahim M Kandil, Mohamad A. Rizk, Nabil Abdel Maksoud H., Mohamad M. Radwan, Khalid Z. El Shieka, Mohamad A. K. M. El Hemaly, and Ahmad T. El Saban.\nUrethro-raphy The New Operation for the treatment of stress urinary incontinence, SUI, detrusor instability, DI, and mixed-type of urinary incontinence; short and long term results. \nhttp://www.obgyn.net/urogyn/urogyn.asp?page=urogyn/articles/\nurethroraphy-09280\n\n4-Abdel Karim M. El Hemaly, Ibrahim M Kandil, and Bahaa E. El Mohamady. Menopause, and Voiding troubles. \nhttp://www.obgyn.net/displayppt.asp?page=/English/pubs/features/presentations/El-Hemaly03/el-hemaly03-ss\n\n5-El Hemaly AKMA, Mousa L.A. Micturition and Urinary\tContinence. Int J Gynecol Obstet 1996; 42: 291-2. \n\n6-Abdel Karim M. El Hemaly.\n Urinary incontinence in gynecology, a review article.\nhttp://www.obgyn.net/urogyn/urogyn.asp?page=/urogyn/articles/abs-urinary_incotinence_gyn_ehemaly \n\n7-El Hemaly AKMA. Nocturnal Enuresis: Pathogenesis and Treatment. \nInt Urogynecol J Pelvic Floor Dysfunct 1998;9: 129-31.\n \n8-El Hemaly AKMA, Mousa L.A.E. Stress Urinary Incontinence, a New Concept. Eur J Obstet Gynecol Reprod Biol 1996; 68: 129-35. \n\n9- El Hemaly AKMA, Kandil I. M. Stress Urinary Incontinence SUI facts and fiction. Is SUI a puzzle?! http://www.obgyn.net/displayppt.asp?page=/English/pubs/features/presentations/El-Hemaly/el-hemaly-ss\n\n10-Abdel Karim El Hemaly, Nabil Abdel Maksoud, Laila A. Mousa, Ibrahim M. Kandil, Asem Anwar, M.A.K El Hemaly and Bahaa E. El Mohamady. \nEvidence based Facts on the Pathogenesis and Management of SUI. http://www.obgyn.net/displayppt.asp?page=/English/pubs/features/presentations/El-Hemaly02/el-hemaly02-ss\n\n11- Abdel Karim M. El Hemaly*, Ibrahim M. Kandil, Mohamad A. Rizk and Mohamad A.K.M.El Hemaly.\n Urethro-plasty, a Novel Operation based on a New Concept, for the Treatment of Stress Urinary Incontinence, S.U.I., Detrusor Instability, D.I., and Mixed-type of Urinary Incontinence.\nhttp://www.obgyn.net/urogyn/urogyn.asp?page=/urogyn/articles/urethro-plasty_01\n\n12-Ibrahim M. Kandil, Abdel Karim M. El Hemaly, Mohamad M. Radwan: Ultrasonic Assessment of the Internal Urethral Sphincter in Stress Urinary Incontinence. The Internet Journal of Gynecology and Obstetrics. 2003. Volume 2 Number 1. \n\n13-Abdel Karim M. El Hemaly. Nocturnal Enureses: A Novel Concept on its pathogenesis and Treatment.\nhttp://www.obgyn.net/urogynecolgy/?page=articles/nocturnal_enuresis\n\n14- Abdel Karim M. El Hemaly. Nocturnal Enureses: An Update on the pathogenesis and Treatment.\nhttp://www.obgyn.net/urogynecology/?page=/ENHLIDH/PUBD/FEATURES/\nPresentations/ Nocturnal_Enuresis/nocturnal_enuresis",institutionString:null,institution:{name:"Al Azhar University",country:{name:"Egypt"}}},{id:"113313",title:"Dr.",name:"Abdel-Aal",middleName:null,surname:"Mantawy",slug:"abdel-aal-mantawy",fullName:"Abdel-Aal Mantawy",position:null,profilePictureURL:"//cdnintech.com/web/frontend/www/assets/author.svg",biography:null,institutionString:null,institution:{name:"Ain Shams University",country:{name:"Egypt"}}}],filtersByRegion:[{group:"region",caption:"North America",value:1,count:5684},{group:"region",caption:"Middle and South America",value:2,count:5166},{group:"region",caption:"Africa",value:3,count:1682},{group:"region",caption:"Asia",value:4,count:10211},{group:"region",caption:"Australia and Oceania",value:5,count:887},{group:"region",caption:"Europe",value:6,count:15616}],offset:12,limit:12,total:1689},chapterEmbeded:{data:{}},editorApplication:{success:null,errors:{}},ofsBooks:{filterParams:{sort:"dateendthirdsteppublish"},books:[],filtersByTopic:[{group:"topic",caption:"Agricultural and Biological Sciences",value:5,count:9},{group:"topic",caption:"Biochemistry, Genetics and Molecular Biology",value:6,count:18},{group:"topic",caption:"Business, Management and Economics",value:7,count:2},{group:"topic",caption:"Chemistry",value:8,count:7},{group:"topic",caption:"Computer and Information Science",value:9,count:10},{group:"topic",caption:"Earth and Planetary Sciences",value:10,count:5},{group:"topic",caption:"Engineering",value:11,count:15},{group:"topic",caption:"Environmental Sciences",value:12,count:2},{group:"topic",caption:"Immunology and Microbiology",value:13,count:5},{group:"topic",caption:"Materials Science",value:14,count:4},{group:"topic",caption:"Mathematics",value:15,count:1},{group:"topic",caption:"Medicine",value:16,count:60},{group:"topic",caption:"Nanotechnology and Nanomaterials",value:17,count:1},{group:"topic",caption:"Neuroscience",value:18,count:1},{group:"topic",caption:"Pharmacology, Toxicology and Pharmaceutical Science",value:19,count:6},{group:"topic",caption:"Physics",value:20,count:2},{group:"topic",caption:"Psychology",value:21,count:3},{group:"topic",caption:"Robotics",value:22,count:1},{group:"topic",caption:"Social Sciences",value:23,count:3},{group:"topic",caption:"Technology",value:24,count:1},{group:"topic",caption:"Veterinary Medicine and Science",value:25,count:2}],offset:0,limit:12,total:null},popularBooks:{featuredBooks:[{type:"book",id:"9208",title:"Welding",subtitle:"Modern Topics",isOpenForSubmission:!1,hash:"7d6be076ccf3a3f8bd2ca52d86d4506b",slug:"welding-modern-topics",bookSignature:"Sadek Crisóstomo Absi Alfaro, Wojciech Borek and Błażej Tomiczek",coverURL:"https://cdn.intechopen.com/books/images_new/9208.jpg",editors:[{id:"65292",title:"Prof.",name:"Sadek Crisostomo Absi",middleName:"C. 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