## Прибор. Microchannel Diffusion. [Редактировать]

Прибор для изучения взаимодействия сыпучих частиц на наноуровне.

## Найдено 252 документов по запросу «Microchannel Diffusion». [Перейти к поиску]

Дата загрузки: 2016-12-06Скачать документСкачать текст |
... electrodes (e) channel base in a groove microchannel and (f) a “three-dimensional” electrode geometry... PEM within a microchannel. Processing starts with (a) a patterned empty microchannel which is (b) filled with liquid PEGDA-sPEGPEA monomer. (c) The microchannel... the microchannel. (d) After photopolymerization excess liquid monomer is removed from the microchannel... for both diffusion and convection of oxygen within the microchannel and oxygen... shows length along the microchannel normalized to microchannel length. For each u av... of the microchannel (in the plane of the cells). The microchannel was... the microchannel. For the insufficient oxygen state only a fraction of the microchannel... length of the microchannel, and D is the diffusion coefficient of the particle... in the microchannel. Solving the equations specifically for a rectangular microchannel (as shown... the microchannel given in Equation 2.4: where L is the length of the microchannel... the microchannel width at (y=0) and for flow in a straight, well defined microchannel... main microchannel. Due to the low Reynold’s number of the microchannel, the... then precisely aligned below a patterned microchannel prior to bonding. Alternatively, membraneless... electrodes (e) channel base in a groove microchannel and (f) a “three-dimensional” electrode geometry... 150 0.58 1.5 Ladder shaped microchannel Groove shaped microchannel Laser-machined Sulfuric acid...-579. 21 “Diffusion and Flow Development In Co-Flowing Microchannel Streams” Oak... preliminary testing of a planar membraneless microchannel fuel cell” Cohen J L, Westly D A, Pechenik... PEM within a microchannel. Processing starts with (a) a patterned empty microchannel which is (b) filled with liquid PEGDA-sPEGPEA monomer. (c) The microchannel... the microchannel. (d) After photopolymerization excess liquid monomer is removed from the microchannel... scaffolds could selectively photopolymerized within a microchannel and restrict the passage of... for both diffusion and convection of oxygen within the microchannel and oxygen... the microchannel) and diffusion (i.e. oxygen flowing through the capping layer into the microchannel... the microchannel flowing from left to right. Oxygen within the microchannel (Equation 4.1) was transported by both convection and diffusion, while... of the microchannel Fl. The flux of oxygen leaving the microchannel was... shows length along the microchannel normalized to microchannel length. For each u av... oxygen transport, diffusion, and convection. Near the inlet of the microchannel, cells... the microchannel, media became oxygen depleted and mass transport from diffusion became significant. By the end of the microchannel, diffusion was... across the length of the microchannel. Diffusion dominated transport (as shown in... (i.e. decreasing in magnitude) along the microchannel length resulting in curved concentration... choice of flow rates and microchannel architecture. 4.3.1 Oxygen Concentration Gradients within... available to move into the microchannel through diffusion. The importance of this... of the microchannel (in the plane of the cells). The microchannel was... concentration profiles in a planar rectangular microchannel alkaline direct methanol ABMFC device... the microchannel. For the insufficient oxygen state only a fraction of the microchannel... use the thinnest gas diffusion barrier between the microchannel and the external... compound) rather than diffusion of oxygen through the microchannel. Simulation techniques described... to hepatocytes in a flat-plate microchannel bioreactor” Roy P, Baskaran H, Tilles A W, Yarmush... microchannel narrowed to 500 µm before reaching an outlet. All simulations used a microchannel... relief of the microchannel structure shown in Figure 5.2a. Microchannel structure was... the main microchannel (in terms of location within the microchannel and width... velocity across the microchannel width. These effects result in diffusion of etchant from high concentration (i.e. the middle of the microchannel... the microchannel (5 mm from the inlet). As etchant moves through the microchannel, diffusion... the microchannel base. At this point, the base of the microchannel was... the microchannel (~120 s). Results demonstrated that in the 1000 µm wide microchannel devices... fuel cell with a bridge shaped microchannel cross-section” LopezMontesinos P O, Yossakda N, Brushet... oxygen in a microchannel from both saturated inflowing fluid and diffusion from the... both diffusion (i.e. oxygen flowing through the capping layer and into the microchannel... preliminary testing of a planar membraneless microchannel fuel cell” Cohen J L, Westly D A, Pechenik... fuel cell with a bridge shaped microchannel cross-section” LopezMontesinos P O, Yossakda N, Brushet...) 145-161. “Diffusion and Flow Development In Co-Flowing Microchannel Streams” Oak... to hepatocytes in a flat-plate microchannel bioreactor” Roy P, Baskaran H, Tilles A W, Yarmush... |

Дата загрузки: 2016-12-06Скачать документСкачать текст |
.... The principle of hydrofocusing in a microchannel is based on laminating cells... Embossed Structures An example of a microchannel structure fabricated in PMMA using... tools and structures. SEMs of (a) a microchannel array of a flow cytometry system... of less than 5 nm. The microchannel intersection illustrates the high surface... aspect ratios. An SEM of a microchannel array of a flow cytometry system..., 1997. 41. McComrick, R.M. et al., Microchannel electrophoretic separations of DNA in..., flows are generally constrained in a microchannel so that fluid flows within... is fabricated is the rectangular microchannel. Here fully developed flow in..., and good etch repeatability. Polymer microchannel fabrication is often accomplished by... also be used directly within a microchannel as bubble expansion acts as... achieve flow rectification by proper microchannel design in order to rectify...,38] fixedgeometry valves (Figure 6.4). Proper microchannel design adds a geometric flow resistance... the physical structure of the microchannel rectifies the flow. A diffuser valve... that connects two parts of a microchannel. As fluid flows in the... flow is through the main microchannel. In the opposite flow direction... open or completely block the microchannel. Peristaltic micropumps therefore require at... used to compress a silicone rubber microchannel. 6.4.5 Acoustic Streaming Acoustic streaming has... Applications in Bio-MEMS When a microchannel is produced from an insulating... an aqueous solution. Because the microchannel is insulating, a tangential electric field... the bulk region of the microchannel, charge neutrality is maintained so.... Because σw is a property of the microchannel material it must be experimentally... per unit area (determined by microchannel material selection), Debye length (determined... with surface charge on the microchannel boundary. (b) Electroosmotic flow field. (Adapted... ........................................................................................... 192 7.7 Design Methodology for Optimal Diffusion-Based, Micromixers for Batch Production... mixing is driven by diffusion, and that diffusion processes are inherently slow... turbulent flow (e.g., Re = 5000) in a microchannel 100 µm by 100 µm in cross... of bonded surfaces. Increasing the microchannel cross-section alleviates the high... patterned on the bottom of a microchannel. The dark areas marked as... toward the center of the microchannel from all directions by negative... a 3D design of a hydrodynamic focusing microchannel fabricated using a soft photolithography–based... blood cell counts obtained using a microchannel based flow cytometer, in Proc... conventional format with a cross-shaped microchannel pattern.28 Their basic chip... recesses in-plane with the microchannel network after glass etching, which...) was achieved using the same microchannel and run buffer. The addition... of dopamine. Hydrodynamic voltammograms exhibited diffusion-limited currents occurring at potentials... Culture-Based Biochip..................................................... 315 11.5.1 Microchannel Fabrication ........................................................ 315 11.5.2 Adhesive Bonding... Figure 11.2. It consists of a microchannel containing parafﬁn islands used for... of Environmental Mycobacteria 303 Embossed microchannel Input & output ports (a) Patterned para... inside a cyclic oleﬁn copolymer (COC) microchannel for bating and culturing bacteria... parafﬁn on COC substrates. Next, a microchannel was formed in a second COC... the two COC substrates. 11.5.1 Microchannel Fabrication Microchannels in COC wafers... three parafﬁn islands inside the microchannel are spaced at 2 mm, each... of the microneedle showing its microchannel, (c) a sophisticatedly designed single microneedle with... with the sieving matrix.12 Microchannel length and depth also influence... bases in a 40 cm–long microchannel, but the separation time was... embedded in a sol-gel in a microchannel was developed and shown to... using a PCSL is straightforward; a patterned microchannel is filled with PCSL (Figure... brought into contact with the microchannel-containing piece (Figure 13.4f... polymer networks for high-throughput microchannel DNA sequencing, Anal. Chem., 76... 361 18. Buchholz, B.A. et al., Microchannel DNA sequencing matrices with a thermally... Barron, A.E., A novel thermogelling matrix for microchannel DNA sequencing based on poly... loader for capillary array electrophoresis microchannel plates, BioTechniques, 31, 1150, 2001... device. Denotations: 1, sample inlet port; 2, diffusion barrier; 3, reaction chamber; 4, flow-delay... (s) (b) FIGURE 14.7 (a) Electroosmotic mobility in microchannel of original PDMS, O 2 plasma–treated... illustrating the geometry of the microchannel. The constricted segment of the... by fluid flow from the microchannel outlets. The inset shows a cross... entire cross-section of the microchannel is illuminated at the detection... (larger thus slower) slows their diffusion; diffusion profile changes compared to profile.... 29. Rodriguez, I., Lee, H.K., and Li, S.F., Microchannel electrophoretic separation of biogenic amines... |

Дата загрузки: 2017-01-10Скачать документСкачать текст |
... summarize the recent advances of microchannel reaction technologies and focus our...). 406 M. Miyazaki et al. Introduction Microchannel reaction systems, which can be... efficiency performance and repeatability. Therefore, microchannel reaction systems are expected to... conditions and time. In addition, microchannel reaction systems provide large surface... summarize the recent advances of microchannel reaction technologies especially on enzyme... used for preparing partially-modified microchannel surface (Zhao et al., 2002...., 2005). Microchannel was fabricated on both bottom and top plates. Microchannel of... devices or materials in the microchannel, such as electrokinetical mixing (Erickson... of microfluidics, rather, it uses a microchannel as the reaction space. The... were improved 3 to 5 fold in a microchannel system. These results demonstrate the... mechanism of enzyme reactions in a microchannel (Sotowa et al., 2008). Such... 1. Typical techniques for enzyme immobilized microchannel reactor preparation. 410 M. Miyazaki et... phosphatase • Enable partial modification of microchannel fibrinogen/Photochemmical • Special equipment is...-immobilized polystylene beads within the microchannel (a). Modified surfaces are also useful... formation (e). Membrane formed within the microchannel can also be used as...-linking enzyme aggregate formed at microchannel surface (g) was used for immobilization... for enzyme immobilization within the microchannel. Glucose oxidase was immobilized within... methacrylate, with an enzyme, in a microchannel (Sakai-Kato et al., 2004... enzyme and entrapping it within a microchannel has also been developed. Trypsin... ENZYME ON MICROCHANNEL SURFACE Methods for enzyme immobilization on the microchannel surface... way to immobilize molecules. In microchannel systems, a biotin-avidin system has... of a functional group on the microchannel surface was used for covalent... to form nanostructures on a silica microchannel surface (Figure 1b) (Miyazaki et...., 2003). This method modifies the microchannel surface with polymerized copolymer of... of functional nanostructure on the microchannel surface (Figure 1c: Thomsen et... filled-in microchannel (Figure 1d) (Wang et al., 2002). The microchannel obtained... immobilization of enzymes on the microchannel surface (Logan et al., 2007... alkaline phosphatase was prepared within a microchannel by exposure to UV light... urease and different enzymes on microchannel surfaces. MEMBRANE-FORMATION Enzymes can... immobilized on a membrane within the microchannel. A porous Enzymatic processing in microfluidic...(vinylidene fluoride) membrane embedded within a microchannel can be used for enzyme... of two solutions occurred in a microchannel (Figure 1f). Peroxidase was immobilized... enzyme-immobilizing membrane on the microchannel surface (Honda 2005). This is... paraformaldehyde into the microchannel forms a CLEA membrane on the microchannel wall (Figure... solution. The reaction in the microchannel was about 5 times faster than... the aqueousorganic interface in the microchannel • Diffusion of the substrate is the... NH2 N Entrapment of Novozym435TM within microchannel • Novozym-435 • Much less of... Entrapment of silicaimmobilized enzymes within microchannel Ref. Garcia et al. 2000... a biphasic stream in a microchannel depends on the diffusion of the substrate into... possesses an electrode within the microchannel (Yoon et al., 2005). Another..., and silica-immobilized peroxidase within a microchannel, were prepared and connected sequentially... have also been performed in a microchannel system. Lipase-immobilized microreactors have... the larger surface area of microchannel systems. A microreaction using immobilized Novozym... a microextractor which has a partially modified microchannel (Yamaguchi et al., 2005). Using... microreaction process development. Concluding remarks Microchannel devices can be useful in..., H. (2005) Immobilization of enzymes on microchannel surface through cross-linking polymerization... a cross-linking enzyme membrane on a microchannel surface. Advanced Synthesis & Catalysis, 348..., M. (2002b) Enhanced enzymatic reactions in a microchannel reactor. Australian Journal of Chemistry... of optically pure cyanohydrins in microchannel using a crude lysate. Chem. Eng... p-chlorophenol in a two-phase flow microchannel system. Lab on a Chip 3, 308..., H. H. (2002) Mixing processes in a zigzag microchannel: Finite element simulations and optical... yield of enzyme reaction in microchannel reactor. Chemistry Letters, 442-443... for preparation of nanostructure on microchannel surface and its usage for...) Preparation of functionalized nanostructures on microchannel surface and their use for...) Efficient immobilization of enzymes on microchannel surface through His-tag and...-210 Miyazaki, M. and Maeda, H. (2006) Microchannel enzyme reactors and their applications...) Mixing and enzyme reactions in a microchannel packed with glass beads. Korean... an enzyme reaction in deep microchannel reactor under high-throughput condition..., H. (2005) Partial chemical modification of a microchannel and stabilization of water-oil... |

Дата загрузки: 2016-12-06Скачать документСкачать текст |
... Dr. Harnett, whose work on microchannel cytometry would not have led... see how molecules within the microchannel will react with different flow... the microcytometer walls. The numerical diffusion solution is greatly affected by... IV. MASS DIFFUSION WITHIN A MICROCYTOMETER ..............................35 A. Experimental Diffusion ........................................................................ 38 B. Diffusion Grid Sensitivity .................................................................... 39... A. Three Dimensional Fluid Flow and Diffusion ..................................... 50 VI. CONCLUSIONS .............................................................................................53 vi... focused stream width of the microchannel diffusion coefficient viii LIST OF TABLES... 34 - Normalized diffusion along a channel. ...................................................... 42 FIGURE 35 - Diffusion down the length... FIGURE 36 – Numerical result for diffusion. .................................................................. 44 FIGURE 37 - Increased focused... “bullet” profile. 51 FIGURE 43 - Diffusion of the three dimensional channel... the most recent design of a microchannel at the University of Louisville... two fluids relies on molecular diffusion (Wu & Nguyen, 2005). There are... cells increases diffusion between the sample and sheath streams. This diffusion will... fluid flow, mass transfer, and diffusion of the microcytometer by using... VII. Other notes on the microchannel code are the direction of..., & Yang, 2005). 34 IV. MASS DIFFUSION WITHIN A MICROCYTOMETER This chapter investigates... different Schmidt numbers on the diffusion rates are explored. Lastly, the...'s Laws of diffusion is the basis for all diffusion problems. Proposed in... (Mills, 2001). Fick's Laws for diffusion of liquids keeps the convection... and pressure gradients: the resulting diffusion can be analyzed on a molar... C is the concentration (Basmadjian, 2007). Diffusion is not only affected by... source heating the cells. Forced diffusion from the electrodes can happen... diffusion is also known as the Soret effect (Mills, 2001). Thermal diffusion increases diffusion between the sample stream and... current path. Forced also increases diffusion between the sample and sheath... on sample flow concentrations. A. Experimental Diffusion Harnett et al. (Harnett, 2009... a concentration level equal to zero. B. Diffusion Grid Sensitivity 39 As with... y-direction resolution will affect the diffusion solution. A comparison between Wu & Nguyen... command file to solve for diffusion is shown in Appendix X. Increasing... x-direction grid lines changes the diffusion level by a small amount. This... y-direction. TABLE III EFFECT OF DIFFUSION BY INCREASING Y-DIRECTIONAL GRID LINES... processing time. An experimental normalized diffusion solution of Wu & Nguyen (2005... clearly shown. FIGURE 34 - Normalized diffusion along a channel. x*=x/W, y*=y/W, c*=c/Co, and Co... solution. A comparison between the numerical diffusion solution (FIGURE 36) and (Harnett... FIGURE 36 – Numerical result for diffusion. C. Effects of Different Asymmetric and... aspects of fluid flow and diffusion within the channel. A disadvantage from.... A. Three Dimensional Fluid Flow and Diffusion The only difference between creating... showing “bullet” profile. 51 For diffusion within the channel, one aspect... of the diffusion are shown in FIGURE 43. FIGURE 43 - Diffusion of... microcytometer grid is capturing the diffusion fairly well, it is still... y-direction will help capture the diffusion better; however this will take... grid solution for capturing the diffusion. FIGURE 44 - Added focused grid... diffusion coefficient 5e-4 fluid density 1.0 nu 1 * * turn on second order artificial diffusion * OBPDE:second-order artificial diffusion $ad2 * OBPDE:ad21,ad22 $ad21,$ad22 * #OBPDE:fourth-order artificial diffusion... diffusion * turn off fourth order artificial diffusion * turn on second order artificial diffusion *OBPDE:second-order artificial diffusion 1 *OBPDE:ad21,ad22 2,2 *OBPDE:fourth-order artificial diffusion 1 *OBPDE... diffusion coefficient 5e4 fluid density 1.0 nu 1 * * turn on second order artificial diffusion * OBPDE:second-order artificial diffusion $ad2 * OBPDE:ad21,ad22 $ad21,$ad22 * #OBPDE:fourth-order artificial diffusion... parameters * kThermal $kThermal passive scalar diffusion coefficient 5e-4 fluid density 1.0 done... diffusion * turn off fourth order artificial diffusion * turn on second order artificial diffusion * OBPDE:second-order artificial diffusion 1 * OBPDE:ad21,ad22 2,2 * OBPDE:fourth-order artificial diffusion 1 * OBPDE... results of CFD to find diffusion, velocity, and temperature profiles Applied... |

Дата загрузки: 2016-12-15Скачать документСкачать текстСкачать переводПосмотреть билингву |
... Dr. Harnett, whose work on microchannel cytometry would not have led... see how molecules within the microchannel will react with different flow... the microcytometer walls. The numerical diffusion solution is greatly affected by... IV. MASS DIFFUSION WITHIN A MICROCYTOMETER ..............................35 A. Experimental Diffusion ........................................................................ 38 B. Diffusion Grid Sensitivity .................................................................... 39... A. Three Dimensional Fluid Flow and Diffusion ..................................... 50 VI. CONCLUSIONS .............................................................................................53 vi... focused stream width of the microchannel diffusion coefficient viii LIST OF TABLES... 34 - Normalized diffusion along a channel. ...................................................... 42 FIGURE 35 - Diffusion down the length... FIGURE 36 – Numerical result for diffusion. .................................................................. 44 FIGURE 37 - Increased focused... “bullet” profile. 51 FIGURE 43 - Diffusion of the three dimensional channel... the most recent design of a microchannel at the University of Louisville... two fluids relies on molecular diffusion (Wu & Nguyen, 2005). There are... cells increases diffusion between the sample and sheath streams. This diffusion will... fluid flow, mass transfer, and diffusion of the microcytometer by using... VII. Other notes on the microchannel code are the direction of..., & Yang, 2005). 34 IV. MASS DIFFUSION WITHIN A MICROCYTOMETER This chapter investigates... different Schmidt numbers on the diffusion rates are explored. Lastly, the...'s Laws of diffusion is the basis for all diffusion problems. Proposed in... (Mills, 2001). Fick's Laws for diffusion of liquids keeps the convection... and pressure gradients: the resulting diffusion can be analyzed on a molar... C is the concentration (Basmadjian, 2007). Diffusion is not only affected by... source heating the cells. Forced diffusion from the electrodes can happen... diffusion is also known as the Soret effect (Mills, 2001). Thermal diffusion increases diffusion between the sample stream and... current path. Forced also increases diffusion between the sample and sheath... on sample flow concentrations. A. Experimental Diffusion Harnett et al. (Harnett, 2009... a concentration level equal to zero. B. Diffusion Grid Sensitivity 39 As with... y-direction resolution will affect the diffusion solution. A comparison between Wu & Nguyen... command file to solve for diffusion is shown in Appendix X. Increasing... x-direction grid lines changes the diffusion level by a small amount. This... y-direction. TABLE III EFFECT OF DIFFUSION BY INCREASING Y-DIRECTIONAL GRID LINES... processing time. An experimental normalized diffusion solution of Wu & Nguyen (2005... clearly shown. FIGURE 34 - Normalized diffusion along a channel. x*=x/W, y*=y/W, c*=c/Co, and Co... solution. A comparison between the numerical diffusion solution (FIGURE 36) and (Harnett... FIGURE 36 – Numerical result for diffusion. C. Effects of Different Asymmetric and... aspects of fluid flow and diffusion within the channel. A disadvantage from.... A. Three Dimensional Fluid Flow and Diffusion The only difference between creating... showing “bullet” profile. 51 For diffusion within the channel, one aspect... of the diffusion are shown in FIGURE 43. FIGURE 43 - Diffusion of... microcytometer grid is capturing the diffusion fairly well, it is still... y-direction will help capture the diffusion better; however this will take... grid solution for capturing the diffusion. FIGURE 44 - Added focused grid... diffusion coefficient 5e-4 fluid density 1.0 nu 1 * * turn on second order artificial diffusion * OBPDE:second-order artificial diffusion $ad2 * OBPDE:ad21,ad22 $ad21,$ad22 * #OBPDE:fourth-order artificial diffusion... diffusion * turn off fourth order artificial diffusion * turn on second order artificial diffusion *OBPDE:second-order artificial diffusion 1 *OBPDE:ad21,ad22 2,2 *OBPDE:fourth-order artificial diffusion 1 *OBPDE... diffusion coefficient 5e4 fluid density 1.0 nu 1 * * turn on second order artificial diffusion * OBPDE:second-order artificial diffusion $ad2 * OBPDE:ad21,ad22 $ad21,$ad22 * #OBPDE:fourth-order artificial diffusion... parameters * kThermal $kThermal passive scalar diffusion coefficient 5e-4 fluid density 1.0 done... diffusion * turn off fourth order artificial diffusion * turn on second order artificial diffusion * OBPDE:second-order artificial diffusion 1 * OBPDE:ad21,ad22 2,2 * OBPDE:fourth-order artificial diffusion 1 * OBPDE... results of CFD to find diffusion, velocity, and temperature profiles Applied... |

Дата загрузки: 2017-01-10Скачать документСкачать текст |
... channels to form a highly perfuse microchannel network. Incorporating collagen into the... to prepare each sample. B. Microjluidic Microchannel Fabrication Using standard soft-lithographic.... III. RESULTS A. MeHA Microchannel Diffusion By rigorously characterizing diffusion of both small and... a quantitative idea of the construct diffusion limit which will aid us... in mind. Based on our diffusion results, we believe that the... to sufficiently perfuse a similar region. B. Microchannel Stacking Using repeated channel crosslinking... channel network resulted in high diffusion. Cell viability experiments are currently... in these multi-level 3D microchannel networks. Fig. 4. 20x and 40x... Summer Undergraduate Research Fellowship. REFERENCES C. Microchannel Endothelialization Using a previously reported technique... |

Дата загрузки: 2017-03-09Скачать документСкачать текстСкачать переводПосмотреть билингву |
.... International Mission Space Station Summary Microchannel Diffusion (Microchannel Diffusion) Using microgravity, researchers seek insight... many others. Knowledge gleaned from Microchannel Diffusion may have implications for drug... |

Дата загрузки: 2017-03-10Скачать документСкачать текстСкачать переводПосмотреть билингву |
... health during long-duration missions. Microchannel Diffusion is study of fluids at...: NASA Optical image of the Microchannel Diffusion device. Credits: Houston Methodist Research... |

Дата загрузки: 2017-01-10Скачать документСкачать текст |
... of flows is dominated by diffusion, meaning a sufficient channel length is... to one another in the microchannel, diffusion occurs at the interface of... only possible by diffusion. In our system, the diffusion time was calculated... low Reynolds number in the microchannel, active mixing is required to... |

Дата загрузки: 2017-01-10Скачать документСкачать текст |
... of flows is dominated by diffusion, meaning a sufficient channel length is... to one another in the microchannel, diffusion occurs at the interface of... only possible by diffusion. In our system, the diffusion time was calculated... low Reynolds number in the microchannel, active mixing is required to... |