Surface roughness using different of material, spindle speed, feed rate and depth of cut.
\\n\\n
Released this past November, the list is based on data collected from the Web of Science and highlights some of the world’s most influential scientific minds by naming the researchers whose publications over the previous decade have included a high number of Highly Cited Papers placing them among the top 1% most-cited.
\\n\\nWe wish to congratulate all of the researchers named and especially our authors on this amazing accomplishment! We are happy and proud to share in their success!
Note: Edited in March 2021
\\n"}]',published:!0,mainMedia:null},components:[{type:"htmlEditorComponent",content:'IntechOpen is proud to announce that 191 of our authors have made the Clarivate™ Highly Cited Researchers List for 2020, ranking them among the top 1% most-cited.
\n\nThroughout the years, the list has named a total of 261 IntechOpen authors as Highly Cited. Of those researchers, 69 have been featured on the list multiple times.
\n\n\n\nReleased this past November, the list is based on data collected from the Web of Science and highlights some of the world’s most influential scientific minds by naming the researchers whose publications over the previous decade have included a high number of Highly Cited Papers placing them among the top 1% most-cited.
\n\nWe wish to congratulate all of the researchers named and especially our authors on this amazing accomplishment! We are happy and proud to share in their success!
Note: Edited in March 2021
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The molecular defects that cause thalassemia are located within the human globulin gene which encodes for alpha and beta globulin polypeptide chain of hemoglobin on chromosome numbers 16 and 11, respectively. These genetic molecular defects in thalassemia lead to reduced or no production of one globulin chain with the excess of the other resulting in alpha thalassemia when the alpha chain is affected and beta thalassemia when the beta chain is affected [2]. In thalassemia, the imbalance of globin chain synthesis leads to red cell damage resulting in destruction of red cells in the marrow (ineffective erythropoiesis) and peripheral circulation (hemolysis) [3]. In addition to pediatrician and hematologist, family physician and general practitioner need to know what thalassemia is, how it is diagnosed and differentiated from other hypochromic microcytic anemias, and what are the principles of treatment and prevention.
Classically, thalassemia affecting population across thalassemic built which extends from the Mediterranean region through Middle East and Sub-Saharan Africa to South and Southeast Asian countries. Nowadays, thalassemia occurs all over the world because of continual migrations of population from these areas to western countries. Thalassemia affects both sexes equally, occurring approximately in 4.4% of every 10,000-live birth [4] and accounting for about 60,000–70,000 children each year who born with different types of thalassemia [5].
In the embryonic life, blood in the blood islands of the yolk sac produces specific types of hemoglobulin called Gower 1 composed of two zeta chains and two epsilon chain (ξ2ε2), Gower 2 composed of two alpha chains and two epsilon chains (α2ε2), and Portland hemoglobulin composed of two zeta chains and two gamma chains (ξ2γ2). In the first trimester, definitive hematopoietic stem cell emerges from the ventral wall of the dorsal aorta which then migrates to fetal liver where fetal hemoglobin is produced (Hb F). Around the time of birth, hematopoietic stem cell migrates to the bone morrow which will become the main site of adult hemoglobin production for the rest of life. The switching from embryonic to fetal and then to adult hemoglobin occurs as a result of well-coordinated developmental stage due to specific expression of globin genes in Alpha and Beta globin loci [6]. Each type of hemoglobin composes of four globin chains. Fetal hemoglobin has two alpha and two gamma chains (
Embryonic, fetal, and adult hemoglobin [
In alpha thalassemia, reduced or no production of alpha globin chains is usually caused by deletion of one or more of the genes responsible for its production. Deletion of one gene results in alpha thalassemia carrier state in which the patient is asymptomatic with normal hematological findings. Deletion of two genes results in alpha thalassemia trait or alpha thalassemia minor in which the patient has no or very mild anemia but with microcytosis. On the other hand, deletion of three genes results in significant production of hemoglobin H consisting of four beta chain (β4), also called alpha thalassemia intermedia, which usually presents with hemolysis, microcytosis, and splenomegaly, while the deletion of the four genes results in the production of significant amount of hemoglobin Bart which consists of four gamma chain (
Regarding the more common type of thalassemia, B thalassemia, more than 200 mutations, and rarely deletions, of the two genes responsible for the production of B chain can be criminated. In B thalassemia, the production of beta chain can range from normal to completely absent resulting in variable clinical presentations. In the one-gene defect, the patient has thalassemia minor, also called trait, in which the patient is asymptomatic apart from mild anemia (hemoglobin level is 2–3 g below the average of his age) and microcytosis. This is commonly mistaken as the more common iron deficiency anemia. If both genes are affected resulting in no or reduced production of beta chain, the patient has thalassemia major (when it is absent) or thalassemia intermedia when it is reduced. Thalassemia major is usually asymptomatic at birth because at this age, normally, the hemoglobin F is predominant. At 6 months of age, the patients present with severe anemia and hepatosplenomegaly. In patients with reduced production of beta chain, clinical spectrum will be beta thalassemia intermedia in which the patient will suffer less severe symptoms with the occasional requirement for blood transfusion and he enjoys long life survival.
The two major consequences of thalassemia major are severe anemia, resulting from ineffective erythropoiesis, and iron overload resulting from regular blood transfusion and also increasing the rate of iron absorption in small intestine. Almost all complications of thalassemia major can be attributed to these two factors. Examples of these complications include skeletal changes, hepatosplenomegaly, growth retardation, multiple endocrine failure, and cardiac problem. Additionally, blood transfusion for anemia and chelation therapy for iron overload represent a major burden on the patient and his family and on the health resources where its prevalence is high. The only hope for children implicated with thalassemia major is bone marrow transplantation when it is done early in life before complications occur.
Hematopoietic stem cell transplantation represents the only curative approach for those unlucky patients with thalassemia. Hematopoietic stem cells from a healthy donor replace the affected bone marrow and restore the normal hematopoiesis. The success rate is inversely correlated with the degree of iron overload and hepatic damage. The availability of healthy acceptable donor is another problem especially in societies with small family size as in China [8].
In areas where thalassemia rate is high, determination of carrier rate by population screening and prenatal diagnosis associated with genetic counseling is very useful by allowing couples at risk to decide about their reproductive choice after explaining the nature of the disease and the associated risk of having an affected child. It is clear that the only way to stop thalassemia is to prevent the birth of affected child by making the premarital screening tests for thalassemia carrier state compulsory for the general population and providing counseling for the affected families. Implementation of effective program for thalassemia control adopted by health authority with the help of international agencies like World Health Organization is fundamental for effective control of thalassemia in countries where its prevalence is high.
The field of microfluidics refers to systems that use millimeter to nanometer-sized fluids for analysis purposes [1]. The system analyzes small samples from micro to nano. Microfluidics is a combination of several fields, such as molecular analysis, molecular biology, biological defense and electronic electronics [2]. Each of these areas contributes to the advancement of microfluidic technology and increased interest in microfluidics [1]. Microflow cytometer are used in the microfluidic flow system, which is a system consisting of a combination of microfluidic and optical, where optical systems are required for analysis purposes [3]. The latest technology for micro flow cytometers focuses on particle focusing to be tested in microfluidics, fluid-controlled shrinkage, optical shrinkage and application integration and integration [3, 4]. Microfluidics are very relevant as they have several advantages, such as requiring only small-sized fluids, and indirectly allowing microfluidics to be tested using micro-to-nano samples [5]. Also, the advantage of microfluidics is that it can be used on small chips. This allows the chip to be used as a portable tool, especially for point of care diagnostic devices (Point of care) (POC). These advantages allow microfluidics to be able to analyze the sample information quickly.
One of the rapidly evolving phenomena in microfluidic studies is hydrodynamic focusing [6]. Hydrodynamic focusing is a technique that concentrates the flow in the center of the device by manipulating the flow rate of the side [7, 8]. During hydrodynamic focusing the middle path is concentrated by being narrowed by the side path flow. This method of hydrodynamic focusing is important in increasing microfluidic sensitivity [9]. Hydrodynamic focusing can be used to accurately position positions of cells, particles and sensor targets [9]. This hydrodynamic focusing method can be used for the purpose of manipulating cells found in blood composition such as white blood cells and red blood cells [10].
Microfluidic devices can initially be designed using Micro-Electro-Mechanical (MEMS) method [11], the manufacture of silicon-based microfluidic devices usually using this method of Micro-Electro-Mechanical System (MEMS) [3], where its progress is in line with the advancement of semiconductor technology [11]. The processes in this MEMS method involve processes such as oxidation, ion application, low pressure chemical vapor deposition (LPCVD), diffusion, splash, etc. [11].
In addition, for the manufacture of microfluidic rapid prototypes, microfluidic devices can be made using PDMS materials using soft lithographic manufacturing methods or PMMA materials using micro milling.
However, micro milling for microfluidics using PMMA material although a simple and inexpensive method, however, the manufacturing period is longer and not suitable for manufacturing devices in large quantities [12]. This micro milling method for microfluidics is an automated process suitable for the rapid manufacture of prototype devices [12]. Micro milling is a subtractive fermentation process, in which cutting tools are used to remove bulk material from the workpiece. The micro-milling system basically has a work table for XY positions for workpieces, cutting [12].
The advancement of microfabrication enables the construction of micro channels with micrometer dimensions. Since microfluidic are usually integrated into microsystems, it is important to determine the characteristics of fluid flow in microfluidic for better microfluidic design and operation. From Figures 1 and 2, microfluidics can be designed using circular or rectangular shapes. Theoretically, the best form of fluid flow mechanism is a circular channel. But, it is not so noticeable when the device has reached the level of micro or nano scale. First of all, a circular duct has a minimum surface area exposed to fluid that can reduce friction between the wall surface and the liquid. So, the energy required is less to pump water for a given flow rate. Second, the shape of the circle is efficient for handling internal stress. Using a circular channel, the pressure power distribution is uniform across the channel circumference. The presence of sharp corners in the rectangular duct will focus on the edges and sometimes this area needs to be strengthened to resist pressure.
Microchannel with rectangular and circular geometrical shape [
Microfluidic with rectangular and circular geometrical shape.
Cell traps with hydrodynamic methods also show the advantage of a round shape to isolate a cell by reducing the applied pressure. By doing this, cells will have a higher percentage to survive in extreme flow conditions [14]. The purpose of this study was to simulate the flow of fluid in the micro-channel using COMSOL Microfluidic. The rectangle was chosen because it is widely used during the fabrication process of PDMS devices with soft lithography.
The terms surface roughness and surface finish are widely used in the manufacturing sector to measure surface after machining. Average roughness is the arithmetic mean of the surface roughness profile measure of the mean line, and is the most widely used and universally recognized surface roughness parameter. The surface roughness of the machine in the final micro milling process depends on commonly used process parameters such as tool geometry, spindle speed, feed rate and depth of cut [15]. There are other factors of the micro milling process that affect the surface roughness such as the tip of the micro milling, the breakdown of the tool, the breakdown of the tool (and the nature of the workpiece which has a high quality surface).
Therefore, factors such as vibration and chip removal where these factors are not critical in the macro scale, can have a significant impact on the surface produced on the micro scale. The surface produced after micro milling is found to be affected by the end radius of the micro-tool and the feed rate. It is reported that when the 2 μm of the end radius, and in the state of the feed rate is reduced, the surface roughness increases, indicating that, the optimal feed rate can produce the lowest surface roughness. Cutting speed d an cutting depth affects the surface roughness on the PMMA material [16]. Further, it is found from previous studies as well, depth cutting has the greatest impact while, cutting speed has the lowest effect [16]. Surface roughness also depends on machining parameters and workpiece conditions, tool and heat conditions were also found to affect surface roughness [16]. In addition, the resulting surface quality after machining can be improved by increasing the rigidity and accuracy of the equipment. Because there are various manufacturing methods for polymer-based microfluidics, changes in the surface of the polymer after the manufacture of microfluids attract the interest of many researchers. Many researchers have tried various methods to reduce surface roughness for microfluidics to improve optical quality and improve biological capabilities.
Table 1 shows the surface roughness produced using the micro milling technique. Based on previous studies, it was found that the surface roughness produced by the micro milling can reach up to as little as 38 nm. However, surface roughness can be achieved up to 38 nm if the micro tool used is coated with the diamond. Micro–tool coated with high-cost diamond are not an option for micro-manufacturing.
Diameter | Material | Spindle speed | Feed rate | Depth of cut | Surface roughness | Reference |
---|---|---|---|---|---|---|
0.8 mm | Carbide | 2000 rpm | 2 mm/min | 1.5 μm | 0.352 μm | [17] |
0.45 mm | Diamond Coated | 150,000 rpm | 5 μm/flute | 50 μm | 38 nm | [18] |
0.2 mm | N/A | 20,000 rpm | 300 mm/min | 10 μm | 0.13 μm | [19] |
0.1 mm to 0.5 mm | Carbide | 10,000 rpm | 20 mm/min | 10–20 μm | 70–85 nm | [20] |
0.8 mm | Carbide | 30,000 rpm | 2.65 mm/min | 40 μm | 128.24 nm | [21] |
Surface roughness using different of material, spindle speed, feed rate and depth of cut.
Since this study uses a micro milling a microfluidic design with a rectangular geometry will be used. From Figure 3, the designed depth is 50 um, 200 um wide, and the circle on the inlet and outlet has a diameter of 0.6 um. Figure 3 shows microfluidics with 2 layer PMMA to be fabricated. From Figure 3, the top layer has 4 holes with a diameter of 0.8 mm, the design of the hole is based on the need to place a tube with an outer diameter of 0.7 mm. While the design for the bottom layer of microfluidics, there is a circular inlet and outlet with a diameter of 0.6 mm which is smaller than the outer diameter of the tube, to allow the tube to be above the microfluidic layer and the entire fluid can enter the micro flow.
Top and bottom layer of microfluidic.
The tool used in this research is a 0.2 mm diameter tool made of carbide material, has 2 flutes and Aluminum coated. While the workpiece that will be used in this research is Poly (methyl methacrylate) or referred to as acrylic which has a thickness of 2 mm.
The Taguchi method as shown in Table 2 is used taking into account 3 main parameters, namely, spindle speed, cutting depth, and feed rate to obtain the lowest surface roughness. The Taguchi method which uses 3 parameters along with 3 stages is used as Table 2. Spindle speeds consisting of 4000 rpm, 5000 rpm, and 6000 rpm, and spindle speeds lower than 10,000 rpm are used because PMMA material will burn when high speeds are used, as high speeds can increase the temperature on the tool can cause micro flow size the result is greater than desired. The cutting depths used for each cut are 0.01 μm, 0.025 μm, and 0.05. This is to ensure that the discarded chip is smaller than the tip of the tool. While the feed rate used is 10 mm/min, 15 mm/min, and 20 mm/min. Due to the high feed rate it can cause the tool to break. The total number of experiments produced is 9 experiments as shown in Table 3, each surface roughness average will be recorded, based on the smallerer the better method, and the smallest surface roughness average parameter will be taken. Then the optimal parameters will be repeated 10 times to ensure that the parameters produce consistent and stable results.
Factors | Level 1 | Level 2 | Aras 3 |
---|---|---|---|
Spindle speed (rpm) | 4000 | 5000 | 6000 |
Depth of cut (μm) | 0.01 | 0.025 | 0.05 |
Feed rate (mm/min) | 10 | 15 | 20 |
Machining parameter (Taguchi method).
Experiment number | Spindle speed (rpm) | Depth of cut (mm) | Feed rate (mm/min) |
---|---|---|---|
1 | 4000 | 0.010 | 10 |
2 | 4000 | 0.025 | 15 |
3 | 4000 | 0.050 | 20 |
4 | 5000 | 0.010 | 15 |
5 | 5000 | 0.025 | 20 |
6 | 5000 | 0.050 | 10 |
7 | 6000 | 0.010 | 20 |
8 | 6000 | 0.250 | 10 |
9 | 6000 | 0.050 | 15 |
Experiment number (Taguchi method).
After analyzing the experimental data from Table 4, the lowest surface roughness can be obtained by using a spindle speed of 4000 rpm, a feed rate of 10 mm/min and a depth cut of 0.01 mm. However, based on Table 4, it can be seen that while the spindle speed is 6000 rpm, cutting depth and feed rate do not have a significant impact on surface roughness, where the average surface roughness is recorded around 100 nm to 200 nm, at the same time, increasing cutting depth and feed rate, increasing average surface roughness resulting. Moreover, it can be observed that all the resulting surface roughness is less than 450 nm. Next, to validate the experiment, 10 microcontrollers were built on PMMA with spindle speed parameters of 4000 rpm, feed rate of 10 mm/min and depth depth of 0.01. During the machining process, a drop of water is placed on the substrate to remove debris during machining. The average surface roughness obtained from 10 validation experiments is shown in Table 5, where the average roughness is 24.0824 nm with a standard deviation of 4.2509 nm.
Number | Spindle speed (rpm) | Depth of cut (mm) | Feed rate (mm/min) | Surface roughness (nm) |
---|---|---|---|---|
1 | 4000 | 0.01 | 10 | 67.3018 |
2 | 4000 | 0.025 | 15 | 267.2102 |
3 | 4000 | 0.05 | 20 | 406.8926 |
4 | 5000 | 0.01 | 15 | 170.2524 |
5 | 5000 | 0.025 | 20 | 350.468 |
6 | 5000 | 0.05 | 10 | 442.6494 |
7 | 6000 | 0.01 | 20 | 119.4901 |
8 | 6000 | 0.025 | 10 | 139.6821 |
9 | 6000 | 0.05 | 15 | 170.2192 |
Surface roughness by using different machining parameters.
Number | Surface roughness (nm) |
---|---|
1 | 21.3106 |
2 | 20.1148 |
3 | 26.7489 |
4 | 23.628 |
5 | 19.3741 |
6 | 23.5145 |
7 | 22.9668 |
8 | 27.5627 |
9 | 33.6486 |
10 | 21.9548 |
Average | 24.08238 |
Surface roughness by using optimal machining parameters.
Selecting the cutting depth range and the feed rate with less than the minimum value will result in an increase in machining time, however, the cutting depth value, spindle speed and high feed rate, can increase the risk of damaged tool as reported [22]. From Table 4 a total of 9 microchannel with a depth of 50 μm and a width of 200 μm were tested using the Alicona Infinite Focus Microscopy (IFM) 3D Optical Profiler used to measure the roughness of the surface on the cut of microchannels. The area of surface roughness shown at Figure 4. Analytical factors can be used to determine the main cutting parameters in the micro milling of the PMMA substrate. Based on Table 4, the larger the resulting range, the greater the influence of these factors on surface roughness, in this research, the depth of cutting indicates the largest range. This shows that the depth of cutting has a great influence on surface roughness. Whereas, the feed rate indicates a low range, this means that the feed rate has the least influence on surface roughness.
Area for surface roughness measurement using infinite focus microscopy.
Table 4 also shows the optimal cutting parameters for obtaining minimal surface roughness. Table 4 shows the combination of machining parameters to obtain the smallest surface roughness is the spindle speed 4000 rpm, cutting depth 0.01 μm and feed rate 10 mm/min. Based on Table 4, the average surface roughness average achieved for this parameter is 67.3018 nm. Moreover, from this study, based on Figure 5, if the study is compared by looking at the same parameter readings, shows that the spindle speed of 6000 rpm can produce the lowest surface roughness compared to the spindle speed of 4000 rpm and 5000 rpm. It shows that the cutting depth of 0.01 μm produces the lowest surface roughness followed by 0.025 mm and 0.05 mm. Furthemore, the feed rate of 15 mm/min produces the lowest surface roughness followed by 10 mm/min and 20 mm/min. Based on Table 4, it shows that the cutting depth most influences the roughness of the resulting surface followed by spindle speed and feed rate. This is in line with the theory that low cutting depths can result in low chip loads, this allows lower surface roughness to be achieved. As previously discussed, low depth of cut can result in low surface roughness.
Result of surface roughness by comparing same machining parameter.
After successful microfluidic installation, the experiment was continued by testing the hydrodynamic focus. This feature is important to ensure that the designed microfluidics can operate, there are several factors that can cause the microfluidics to be unable to operate, firstly due to clogged microwaves, secondly because the bond between the 2 wafers is not strong causing small holes that cause leakage. Based on Table 6, the resulting focusing width is related to the sheath and sample flow rate ratio. The resulting focusing width can be adjusted according to the desired application. However, the sample flow width must be adjusted according to the specific cell size for detection, at the same time, allowing cells to pass through them one by one on the sample flow, this is to increase the sensitivity of the constructed device. Reynold numbers are kept in low condition, this is to avoid uninterrupted flow of microfluidics [23].
Ratio | Sheath flow rate | Sample flow rate | Width of hydrodynamic focusing |
---|---|---|---|
10 | 1000 μl/min | 100 μl/min | 89 μm |
100 | 1000 μl/min | 10 μl/min | 67 μm |
30 | 3000 μl/min | 100 μl/min | 60 μm |
300 | 3000 μl/min | 10 μl/min | 39 μm |
Width of hydrodynamic focusing.
Based on this hydrodynamic focusing experiment shown at Figure 6, the side path with a flow rate of 3000 μl/min and the flow rate for the sample path of 10 μl/min can produce a focusing width as low as 39 μm. However, with an sheath flow rate of 3000 μl/min and a sample path flow rate of 100 μl/min, the resulting focusing width is 60 μm. Both of these results answer for the objective of the study, namely the production of hydrodynamic focusing around 60 μm. Based on Table 6 it can also be observed, that if a flow rate ratio of 10 and 100 is used, a focusing width of 67 μm and 89 μm can be produced. From the simulation results show that effective hydrodynamic focusing occurs only when the sheath flow rate is higher than the center flow rate.
Setup for hydrodynamic focusing experiment.
Furthermore, from the simulation results of nonlinear behavior will occur when too high a ratio is used. Increasing the ratio of sheath flow rate to large central flow will only have a small effect on hydrodynamic focusing and may even cause hydrodynamic focusing not to occur if too high a flow rate is used. As shown in Figure 7, the hydrodynamic focusing that occurs is in the state of laminate and fully developed. This experiment can also give the impression that the bonding technique between 2 PMMA wafers using ethanol material was successfully performed, since hydrodynamic focusing can be formed. However, it should be noted that the hydrodynamic focus that occurs is not only due to the inflow rate by the fluid only, but the microfluidic geometry constructed also has a significant impact on the characteristics of hydrodynamic focusing. Especially when taking into account the rectangular geometry is easier to do by a micro milling than a round design. The forces formed to control hydrodynamic focusing are more complex than hydrodynamic focusing calculated only on the flow rate ratio [24].
Hydrodynamic focusing.
An important aspect of designing and operating for the purpose of hydrodynamic focusing is to identify the position of the focus flow formed. Both lateral flows should have the same flow rate to ensure that the focusing flow flows in the middle of the micro flow. If the asymmetric focusing flow, the focusing flow will be deducted from the flow axis. Based on Figure 7, it can be observed that the hydrodynamic focusing width will decrease if the ratio (sheath flow rate to the main flow rate) increases. It can also be observed from the experiment, it shows that the results of focusing will shrink if a larger ratio is used.
In this study, simple, low-cost and real-time methods have been used to detect touch between tools and workpieces. The objective of this study is to find the optimal parameters to achieve low surface roughness using a micro milling, from the data trends obtained, the parameters to obtain the lowest surface roughness are 4000 rpm spindle speed, 10 mm/min billing rate and 0.01 μm cutting depth. However, from the data obtained as well, it shows that water droplets placed on the tool during cutting also contribute to the reduction of surface roughness. In addition, there are several other parameters that can be studied in the future, namely the tool material (e.g. diamond), the smaller tool size, and the type of coolant used.
Since microfluidics manufacturing studies designed using micro milling are still limited, its function can be tested by looking at the hydrodynamic focusing that occurs. This study uses 2 PMMA-based wafers and is bonded using thermal-assisted ethanol. Based on the experiments conducted, the resulting hydrodynamic focusing has a width as small as 39 μm if the sheath flow rate and the center flow rate used are 3000 μl/min and 100 μl/min. Apart from using fluids such as water and dyes, fluids that have properties such as blood can also be used so that more accurate results can be produced.
The authors would like to thank Universiti Kebangsaan Malaysia, in particular the Nanophotonics Lab, Institute of Microengineering and Nanoelectronics (IMEN) for providing the facilities and for supporting this research through the Research University Grant scheme, GUP-2019-071.
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