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| DC 欄位 | 值 | 語言 |
|---|---|---|
| dc.contributor.advisor | 陳炳煇 | |
| dc.contributor.author | Chih-Wei Chang | en |
| dc.contributor.author | 張志偉 | zh_TW |
| dc.date.accessioned | 2021-06-13T02:46:31Z | - |
| dc.date.available | 2008-10-25 | |
| dc.date.copyright | 2006-10-25 | |
| dc.date.issued | 2006 | |
| dc.date.submitted | 2006-10-13 | |
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R., and Brunnschweiler, A., 1999, “Improved characterization technique for micromixers,” Journal of Micromechanics and Microengineering, 9, no. 2, pp. 156-158 Link, D. R., Anna, S. L., Weitz, D. A., and Stone, H. A., 2004,“Geometrically Mediated Breakup of Drops in Microfluidic Devices,” Physical Review Letters, 92(5), pp. 054503-1-4. Liu, R. H., Stremler, M. A., Sharp, K. V., Olsen, M. G., Santiago, J. G., Adrian, R. J., Aref, H., and Beebe, D. J., 2000, “Passive Mixing in a Three-Dimensional Serpentine Microchannel,” Journal of Microelectromechanical Systems, 9, pp. 190-197 Masashige Shinkai, Akira Ito, 2004, “Functional Magnetic Particles for Medical Application,” Journal of Bioscience and Bioengineering, 94(6), pp.606-613 Oddy, M. H., Santiago, J. G. and Mikkelsen, J. C., 2001, “Electrokinetic Instability Micromixing,” Analytical Chemistry, 73, pp.5822-5832 Papell. S. S., 1965, 'Manufacture of Magnetofluids,' U. S. Patent. No. 3215527. Park, G. S. and Park, S. H., 1999, “Design of magnetic fluid linear pump,” IEEE Transactions on Magnetics, 35, pp. 4058–4060 Pankhurst, Q. A., Connolly, J., Jones, S. K. and Dobson, J., 2003, :Applications of magnetic nanoparticles in biomedicine,” Journal of Physics D: Applied Physics., 36, R167 Pennemann , H., Hessel, V., Kost, H.-J., Löwe, H., de Bellefon, C., 2004, “Investigations on pulse broadening for transient catalyst screening in gas/liquid systems,” The American Institute of Chemical Engineers, Journal 50 (8), pp. 1814–1823. Raj, K. and Moskowitz, R., 1990, “Commercial applications of ferrofluids,” Journal of Magnetism and Magnetic Materials, 85, pp.233-245 Rashidnia, N., Balasubramaniam, R., Kuang, J., Petitjeans, P., and Maxworthy, T., 2001, “Measurement of the Diffusion Coefficient of Miscible Fluids Using Both Interferometry and Wiener's Method,” International Journal of Thermophysics, 22 (2), pp. 547-555 Rosenweig, R. E., 1985, Ferrohydrodynamics, Cambridge University Press, New York. Rosenweig, R. E., 2002, “Heating magnetic fluid with alternating magnetic field,” Journal of Magnetism and Magnetic Materials, 252, pp.370-374 Song, H., Tice, J. D. and Ismagilov, R. F., 2003, “A microfluidic system for controlling reaction networks in time,” Angewandte Chemie International Edition, 42, pp. 768-772 Stroock, A. D., Dertinger, S. K. W., Ajdari, A., Mezic, I., Stone, H. A., and Whitesides, G. M., 2002, “Chaotic Mixer for Microchannels,” Science, 295, pp. 647-651 Tice, J. D., Song, H., Lyon, A. D., Ismagilov, R. F., 2003, “Formation of droplets and mixing in multiphase microfluidics at low values of the Reynolds and the Capillary Numbers,” Langmuir, 19, pp. 9127-9133 Walker, G. M., Ozers, M. S. and Beebe, D. J., 2004, “Cell infection within a microfluidic device using virus gradients,” Sensors Actuators B, 98 pp. 347–355 White, F. M., 1991, “Viscouc Fluid Flow,” 2nd ed., McGRAW-Hill, Singapore Wu, Z., Nguyen, N. T. and Huang, X. Y., 2004, “Non-linear diffusive mixing in microchannels: theory and experiments,” Journal of Micromechanics and Microengineering, 14, pp.604–611 Yamahata, C., Chastellain, M., Parashar, V. K., Petri, A., Hofmann, H. and Gijs, M. A. M., 2005 “Plastic Micropump With Ferrofluidic Actuation,” Journal of Microelectromechanical Systems, 14, pp. 96-102 Yang, Z., Gooto, H., Matsumoto, M., Maeda, R., 2000, “Active micromixer for microfluidic systems using lead-zirconate-titanate (pzt)-generated ultrasonic vibration,” Electrophoresis, 21, pp.116–119 Zahn, M., 2001, “Magnetic fluid and nanoparticle applications to nanotechnology,” Journal of Nanoparticle Research, 3, pp. 73–78 | |
| dc.identifier.uri | http://tdr.lib.ntu.edu.tw/jspui/handle/123456789/31378 | - |
| dc.description.abstract | The mixing and the separation of the ferrofluid in microfluidic chips were investigated in this thesis. Mixing processes of the ferrofluid in the presence of a permanent magnet (5mm*4mm*2mm, 1000 Gauss) are highly different from that of pure diffusion. The magnetic field re-distributes the ferrofluid and the mixing efficiencies vary with the positions of the magnet and the volumetric flow rates of the fluids. With the suitable setup of the magnet, the mixing efficiencies can reach more than 90% within one characterisitic width of the channel. The segmented flows are also studied by injecting two immiscible fluids (water and oil were used in the present study) into the microchannel, which can be applied for fluid control. The length of the segmented slugs can be controlled by modulating the flow rates of water and oil; the geometry of the microchannels also plays an important role during the formation of the slugs. The mixing and the separation were then combined on the PDMS microfluidic chips to perform a more complete function. By the suitable design of the microfluidic chips and the proper position of the magnet, mixing and separation of the ferrofluid in microfluidic chips can be performed in order. | en |
| dc.description.provenance | Made available in DSpace on 2021-06-13T02:46:31Z (GMT). No. of bitstreams: 1 ntu-95-F91522308-1.pdf: 12605249 bytes, checksum: 4bd3224534fdd54a5313d8c663a0b0c0 (MD5) Previous issue date: 2006 | en |
| dc.description.tableofcontents | Table of Contents
Acknowledgement I Abstract II Nomenclature IV Table of Content VI List of Tables IX List of Figures X Chapter 1 Introduction 1 1.1 General Remarks 1 1.2 Literature Survey 3 1.2.1 Ferrofluids 3 1.2.2 Micromixers 6 1.2.3 Segmented Flow 8 1.3 Motivation and Objectives 9 1.4 Outline of the Thesis 10 Chapter 2 Apparatuses and Fabrication Processes 16 2.1 Fabrication of Ferrofluid 16 2.1.1 The Procedure of the Precipitation Method 17 2.1.2 Properties of the Ferrofluid 19 2.2 Fabrication of PDMS Microfluidic Chips 21 2.2.1 Fabrication of the Mold via MEMS Processes 22 2.2.2 Fabrication of the PDMS Microfluidic Chips 23 2.3 Experimental Apparatus 24 2.4 The Experimental Procedure 25 Chapter 3 Mixing of Ferrofluid in Microchannels 39 3.1 Introduction 39 3.1.1 Evaluation of the Mixing Efficiency 39 3.1.2 Testing Conditions 41 3.2 Mixing by diffusion 41 3.3 Mixing by the magnetic agitation on ferrofluid 42 3.3.1 Mixing Efficiency of Side-Mode 42 3.3.2 Mixing Efficiency of Side-Mode in the Downstream Region 44 3.3.3 Mixing Efficiency of Center-Mode 45 3.3.4 Mixing Efficiency of Center-Mode in the Downstream Region 46 3.4 Discussions 48 Chapter 4 Segmented Flow of Ferrofluid in Microchannels 85 4.1 Formation of the Segmented Flow 85 4.1.1 T-type Microchannel 86 4.1.2 Bifurcation of Segmented Flow in Microchannel 88 4.2 Separation of the Slug Flows with a Magnet 92 4.3 Discussions 93 Chapter 5 Integration of the Mixing and Separation 114 5.1 Combination of Mixing and Separation 114 5.2 Mixing and Separation in a Single Chip 116 5.3 Handling of the droplets of ferrofluid 117 Chapter 6 Conclusions and Prospects 131 References 133 List of Tables Table 1.1 15 The classification of the active mixing mechanisms (Hessel et al., 2005) Table 1.2 15 The classification of the passive mixing mechanisms (Hessel et al., 2005) Table 2.1 37 Chemical reagents used in the experiment. Table 2.2 38 Physical properties of the ferrofluid. Table 4.1 112 The contact angles and the surface tension of the fluids Table 4.2 113 List of the generation of ferrofluid slugs among tested cases for the bifurcate channel of type I. List of Figures Figure 1.1 11 Hexagonal peaking patterns when a perpendicular magnetic field is applied to a layer of the magnetic fluid with saturation magnetization of 400 Gauss. The applied magnetic field is about 200 Gauss for the left picture and 330 Gauss for the right picture. (Zahn, 2001) Figure 1.2 12 Schematic illustration of the formation of the plugs. Three aqueous solutions are cut by a stream of water-immiscible fluorinated fluid, PFD, to form plugs. Droplets were mixed rapidly by recirculation shown by the white arrows. (Tice et al., 2003) Figure 1.3 13 The illustration of the ferrofluidic valves and pumps. (Hartshorne et al., 2004) (a)Two designs of the ferrofluid valves. The dark regions of the channels represent ferrofluid; the small disks represent permanent magnets. (b)The sketch of the ferrofluidic pump. Figure 1.4 14 The principle of a circular ferrofluid pump. (Hatch et al., 2001) Figure 2.1 26 The procedure of the precipitation method to fabricate the ferrofluid. Figure 2.2 27 The procedure of transferring the solvent from water to oil Figure 2.3 28 Magnetic effects on the ferrofluid and the pure fluid. (a)Water-based ferrofluid vs. DI water; (b)Oil-based ferrofluid vs. diesel oil. Figure 2.4 29 The adsorption model showing the relation between the surfactant and the particle. (a)Model for water-based ferrofluid; (b)Model for oil-based ferrofluid. Figure 2.5 30 TEM photos showing the sizes of the ferro-particles. (a)Water-based ferrofluid; (b)Oil-based ferrofluid. Figure 2.6 31 Magnetization curves measured by a VSM. (a)Water-based ferrofluid (0.078M); (b)Oil-based ferrofluid (0.078M) Figure 2.7 32 The procedure of making a microfluidic chip via soft lithography. Figure 2.8 33 The procedure of photolithography. Figure 2.9 34 A sample of the SU-8 mold. Figure 2.10 35 A sample of the microfluidic chip. Figure 2.11 36 The measuring system. Figure 3.1 51 Illustrations of the position of the magnet relative to the microchannel. (a) side-mode; (b) center-mode. Figure 3.2 52 Pictures of mixing processes of T-junction (left) and Y-junction (right) in microchannel with 300μm in width: (a) Q=2 μl / min; (b) Q=6 μl / min; (c) Q=20 μl / min. Figure 3.3 53 Streamwise mixing efficiencies without external magnetic field along microchannelswith 300μm in width at different volumetric flow rates. Figure 3.4 54 Streamwise mixing efficiencies without external magnetic field along microchannels with 500μm in width at different volumetric flow rates. Figure 3.5 55 Streamwise mixing efficiencies without external magnetic field along microchannels with 1000μm in width at different volumetric flow rates. Figure 3.6 56 Pictures of mixing processes of T-junction (left) and Y-junction (right) in microchannel of 300μm in width at different volumetric flow rates with a side-mode magnet: (a) Q=2 μl / min; (b) Q=6 μl / min; (c) Q=20 μl / min. Figure 3.7 57 Streamwise mixing efficiencies of the side-mode along microchannels with 300μm in width at different volumetric flow rates. Figure 3.8 58 Pictures of mixing processes of T-junction (left) and Y-junction (right) in microchannel of 500μm in width at different volumetric flow rates with a side-mode magnet: (a) Q=2 μl / min; (b) Q=6 μl / min; (c) Q=20 μl / min. Figure 3.9 59 Streamwise mixing efficiencies of the side-mode along microchannels with 500μm in width at different volumetric flow rates. Figure 3.10 60 Pictures of mixing processes of T-junction (left) and Y-junction (right) in microchannel of 1000μm in width at different volumetric flow rates with a side-mode magnet: (a) Q=2 μl / min; (b) Q=6 μl / min; (c) Q=20 μl / min. Figure 3.11 61 Streamwise mixing efficiencies of the side-mode along microchannels with 1000μm in width at different volumetric flow rates. Figure 3.12 62 Pictures of mixing processes in the downstream region of T-junction (left) and Y-junction (right) in microchannel of 300μm in width at different volumetric flow rates with a side-mode magnet: (a) Q=2 μl / min; (b) Q=6 μl / min; (c) Q=20 μl / min.. Figure 3.13 63 Streamwise mixing efficiencies in the downstream region of the side-mode along microchannels with 300μm in width at different volumetric flow rates. Figure 3.14 64 Pictures of mixing processes in the downstream region of T-junction (left) and Y-junction (right) in microchannel of 500μm in width at different volumetric flow rates with a side-mode magnet: (a) Q=2 μl / min; (b) Q=6 μl / min; (c) Q=20 μl / min. Figure 3.15 65 Streamwise mixing efficiencies in the downstream region of the side-mode along microchannels with 500μm in width at different volumetric flow rates. Figure 3.16 66 Pictures of mixing processes in the downstream region of T-junction (left) and Y-junction (right) in microchannel of 1000μm in width at different volumetric flow rates with a side-mode magnet: (a) Q=2 μl / min; (b) Q=6 μl / min; (c) Q=20 μl / min. Figure 3.17 67 Streamwise mixing efficiencies in the downstream region of the side-mode along microchannels with 1000μm in width at different volumetric flow rates. Figure 3.18 68 The development of the ferrofluid layer in Y-junction microchannel of 500μm in width at different volumetric flow rates with a side-mode magnet: (a) Q=2 μl / min; (b) Q=6 μl / min; (c) Q=20 μl / min. Figure 3.19 69 Pictures of mixing processes of T-junction (left) and Y-junction (right) in microchannel of 300μm in width at different volumetric flow rates with a center-mode magnet: (a) Q=2 μl / min; (b) Q=6 μl / min; (c) Q=20 μl / min Figure 3.20 70 Streamwise mixing efficiencies of the center-mode along microchannels with 300μm in width at different volumetric flow rates. Figure 3.21 71 Pictures of mixing processes of T-junction (left) and Y-junction (right) in microchannel of 500μm in width at different volumetric flow rates with a center-mode magnet: (a) Q=2 μl / min; (b) Q=6 μl / min; (c) Q=20 μl / min. Figure 3.22 72 Streamwise mixing efficiencies of the center-mode along microchannels with 500μm in width at different volumetric flow rates. Figure 3.23 73 Pictures of mixing processes of T-junction (left) and Y-junction (right) in microchannel of 1000μm in width at different volumetric flow rates with a center-mode magnet: (a) Q=2 μl / min; (b) Q=6 μl / min; (c) Q=20 μl / min Figure 3.24 74 Streamwise mixing efficiencies of the center-mode along microchannels with 1000μm in width at different volumetric flow rates. Figure 3.25 75 Pictures of mixing processes in the downstream region of T-junction (left) and Y-junction (right) in microchannel of 300μm in width at different volumetric flow rates with a center-mode magnet: (a) Q=2 μl / min; (b) Q=6 μl / min; (c) Q=20 μl / min. Figure 3.26 76 Streamwise mixing efficiencies in the downstream region of the center-mode along microchannels with 300μm in width at different volumetric flow rates. Figure 3.27 77 Pictures of mixing processes in the downstream region of T-junction (left) and Y-junction (right) in microchannel of 500μm in width at different volumetric flow rates with a center-mode magnet: (a) Q=2 μl / min; (b) Q=6 μl / min; (c) Q=20 μl / min. Figure 3.28 78 Streamwise mixing efficiencies in the downstream region of the center-mode along microchannels with 500μm in width at different volumetric flow rates. Figure 3.29 79 Pictures of mixing processes in the downstream region of T-junction (left) and Y-junction (right) in microchannel of 1000μm in width at different volumetric flow rates with a center-mode magnet: (a) Q=2 μl / min; (b) Q=6 μl / min; (c) Q=20 μl / min. Figure 3.30 80 Streamwise mixing efficiencies in the downstream region of the center-mode along microchannels with 1000μm in width at different volumetric flow rates. Figure 3.31 81 Mixing efficiencies without external magnetic field near the position of 1000μm after two fluids contact for different channels. (a)η vs. Re; (b)η vs. Pe Figure 3.32 82 Mixing efficiencies of the center-mode near the position of 1000μm after two fluids contact for different channels. (a)η vs. Re; (b)η vs. Pe Figure 3.33 83 Mixing efficiencies in the downstream region of the center-mode near the position of 1000μm after two fluids contact for different channels. (a)η vs. Re; (b)η vs. Pe Figure 3.34 84 Schematic drawing of the cross-section of the ferrofluid layer within the microchannel. (a) one magnet; (b)two magnet. Figure 4.1 95 The slug flow in T-junction microchannel. (300μm) Qf: 5 μl / min; Qo: 5 μl / min Figure 4.2 96 The length of slugs for T-junction microchannel (300μm). (a)The lengths of slugs versus the flow rate of oil (b)The lengths of slugs versus the flow rate of water-based ferrofluid Figure 4.3 97 The length of slugs for T-junction microchannel (500μm). (a)The lengths of slugs versus the flow rate of oil (b)The lengths of slugs versus the flow rate of water-based ferrofluid Figure 4.4 98 The length of slugs for T-junction microchannel (1000μm). (a) The lengths of slugs versus the flow rate of oil (b) The lengths of slugs versus the flow rate of water-based ferrofluid. Figure 4.5 99 Comparison of measured results in T-junction channel among three different channel widths: (a)The length of the slugs; (b)The volume of the slugs. Figure 4.6 100 The dimensionless lengths of slugs vs. the Weber number (We) between the T-type channels of the different widths. (a) constant flow rates of water-based ferrofluid; (b) constant flow rates of diesel oil Figure 4.7 101 The dimensionless lengths of slugs vs. the Capillary number (Ca) between the T-type channels of the different widths. (a) constant flow rates of water-based ferrofluid; (b) constant flow rates of diesel oil Figure 4.8 102 Geometries of the microchannels tested in the present study. (a)cross-junction; (b)Bifurcate channel of Type-I; (c)Bifurcate channel of Type-II Figure 4.9 103 The common patterns of the cross-junction channel at a volumetric flow rate of Qf = Qo = 5 μl / min and channel width of 500 | |
| dc.language.iso | en | |
| dc.subject | 分離 | zh_TW |
| dc.subject | 磁性流體 | zh_TW |
| dc.subject | 微流體晶片 | zh_TW |
| dc.subject | 混合 | zh_TW |
| dc.subject | microfluidic chip | en |
| dc.subject | ferrofluid | en |
| dc.subject | mixing | en |
| dc.subject | separation | en |
| dc.title | 磁性流體在微流體晶片之混合與分離之研究 | zh_TW |
| dc.title | The Study on the Mixing and Separation of the Ferrofluid in Microfluidic Chips | en |
| dc.type | Thesis | |
| dc.date.schoolyear | 95-1 | |
| dc.description.degree | 博士 | |
| dc.contributor.oralexamcommittee | 鍾清枝,苗志銘,李達生,陳瑤明,陳希立 | |
| dc.subject.keyword | 磁性流體,混合,分離,微流體晶片, | zh_TW |
| dc.subject.keyword | ferrofluid,mixing,separation,microfluidic chip, | en |
| dc.relation.page | 138 | |
| dc.rights.note | 有償授權 | |
| dc.date.accepted | 2006-10-17 | |
| dc.contributor.author-college | 工學院 | zh_TW |
| dc.contributor.author-dept | 機械工程學研究所 | zh_TW |
| 顯示於系所單位： | 機械工程學系 | |
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