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capillary Rise in a Single Tortuous capillary

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Chinese Physics Letters 2010年第5期27卷 148-151页

作者：蔡建超郁伯铭梅茂飞罗良 School of Physics Huazhong University of Science and Technology Wuhan 430074

The impact of convolutedness of capillary on the capillary rise of wetting liquid in a single tortuous capillary is studied. By introducing tortuosity and fractal dimension for a tortuous capillary, analytical expression for time evolution of the height/weight of capillary rise is obtained. It is found that the accumulated weight of liquid imbibed into a single tortuous capillary is independent of the shape of a capillary in the early rising stage.

关键词： capillary rise capillary rise single tortuous

capillary pumping independent of the liquid surface energy and viscosity

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Microsystems & Nanoengineering 2018年第1期4卷 423-429页

作者： Weijin Guo Jonas Hansson Wouter van der Wijngaart Micro and Nanosystems KTH Royal Institute of TechnologyOsquldas väg 10Stockholm 10044Sweden

capillary pumping is an attractive means of liquid actuation because it is a passive mechanism,i.e.,it does not rely on an external energy supply during *** capillary flow rate generally depends on the liquid sample viscosity and surface *** poses a problem for capillary-driven systems that rely on a predictable flow rate and for which the sample viscosity or surface energy are not precisely ***,we introduce the capillary pumping of sample liquids with a flow rate that is constant in time and independent of the sample viscosity and sample surface *** features are enabled by a design in which a well-characterized pump liquid is capillarily imbibed into the downstream section of the pump and thereby pulls the unknown sample liquid into the upstream pump *** downstream pump geometry is designed to exert a Laplace pressure and fluidic resistance that are substantially larger than those exerted by the upstream pump geometry on the sample ***,the influence of the unknown sample liquid on the flow rate is *** experimentally tested pumps of the new design with a variety of sample liquids,including water,different samples of whole blood,different samples of urine,isopropanol,mineral oil,and *** capillary filling speeds of these liquids vary by more than a factor 1000 when imbibed to a standard constant cross-section glass *** our new pump design,20 filling tests involving these liquid samples with vastly different properties resulted in a constant volumetric flow rate in the range of 20.96–24.76μL/*** expect this novel capillary design to have immediate applications in lab-on-a-chip systems and diagnostic devices.

关键词： viscosity capillary pump

capillary-force-induced collapse lithography for controlled plasmonic nanogap structures

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Microsystems & Nanoengineering 2020年第1期6卷 404-412页

作者： Inki Kim Jungho Mun Wooseup Hwang Younghwan Yang Junsuk Rho Department of Mechanical Engineering Pohang University of Science and Technology(POSTECH)Pohang 37673Republic of Korea Department of Chemical Engineering Pohang University of Science and Technology(POSTECH)Pohang 37673Republic of Korea Department of Chemistry Pohang University of Science and Technology(POSTECH)Pohang 37673Republic of Korea National Institute of Nanomaterials and Technology(NINT) Pohang 37673Republic of Korea

The capillary force effect is one of the most important fabrication parameters that must be considered at the micro/nanoscale because it is strong enough to deform micro/***,the deformation of micro/nanostructures due to such capillary forces(e.g.,stiction and collapse)has been regarded as an undesirable and uncontrollable obstacle to be avoided during ***,we present a capillary-force-induced collapse lithography(CCL)technique,which exploits the capillary force to precisely control the collapse of micro/*** uses electron-beam lithography,so nanopillars with various shapes can be fabricated by precisely controlling the capillary-force-dominant cohesion process and the nanopillar-geometry-dominant collapse process by adjusting the fabrication parameters such as the development time,electron dose,and shape of the *** aims to achieve sub-10-nm plasmonic nanogap structures that promote extremely strong focusing of *** is a simple and straightforward method to realize such nanogap structures that are needed for further research such as on plasmonic nanosensors.

关键词： capillary structures collapse

capillary electrophoretic separation of glycoproteins

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Science China Chemistry 1998年第1期41卷 71-76页

作者：陈义 Institute of Chemistry Chinese Academy of Sciences Beijing China

A capillary electrophoretic approach has been developed for analyzing the microheterogeneity of glycoproteins. The key factors include the buffer composition, concentration, pH, and the surface treatment of the capillaries used. It has been shown that, if the buffer is mainly composed of alcohol amines and the capillaries are coated with polyacrylamide, ovalbumin from chicken egg can be separated into more than 25 peaks and that of transferrin about 10 peaks.

关键词： glycoprotein microheterogeneity capillary electrophoresis.

capillary electrophoresis of FITC labeled amino acids with laser-induced fluorescence detection

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Science China Chemistry 1999年第6期42卷 663-669页

作者：党福全陈义 Center for Molecular Science Institute of Chemistry Chinese Academy of Sciences Beijing China

FITC labeled amino acids have been separated using a home-built capillary electrophoresis with a laser-induced fluorescence detection (CE-LIF) system. Seventeen peaks can now be generated from the twenty common amino ... 详细信息

关键词： capillary electrophoresis with laser-induced fluorescence amino acids fuorescein isothiocyanate (FITC).

capillary Electrophoretic Separation of Monosialogangliosides by using cyclodextrin and borax as selectors

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Chinese Chemical Letters 1996年第11期7卷 1033-1034页

作者： Chang, LW Yu, ZL Xu, GY Chen, Y CHINESE ACAD SCI DEPT CHEMBEIJING 100080PEOPLES R CHINA

f The CE separation of monosialogangliosids (MSGLS) is generally difficult owing to theirmixed micelle formation. The addition of high concentration of borax to the buffer containing α-Cyclodextrin allowed for improvement of selectivity of separation. Under the optimum conditions,several forms of MSGLS were successfully separated and the commercial standard GM1 gave twopeaks, suggesting that the standard may contain two different types of species.

关键词： Monosialogangliosides using Separation capillary

capillary Micro-Flow Through a Fiber Bundle(Ⅰ)

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Journal of Wuhan University of Technology(Materials Science) 2004年第2期19卷 94-97页

作者：祝颖丹 Wuhan University of Technology

The present work considered the capillary micro-flow through a fiber *** resin heights in the fiber bundle as a function of time were used to determine the experimental values of capillary pressure and the permeability by the nonlinear regression fitting *** fitting curves showed a good agreement with ***,these values of capillary pressure from short-time experiments were much lower than the theoretical results from the Yang-Laplace *** accurate capillary pressure was predicted from the presented long-run experiment.

关键词： capillary micro flow fiber bundle

capillary Micro-flow Through a Fiber Bundle(Part 2)

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Journal of Wuhan University of Technology(Materials Science) 2005年第3期20卷 64-66页

作者：祝颖丹 Department of Composites Materials Wuhan University of Technology

A numerical model was proposed to simulate the capillary micro-flow through a fiber bundle. The capillary pressure was predicted by the Young-Laplace equation and the corresponding optimal values of permeability were found by a trial-and-error method. The empirical Kozeny constants which are dependent on fiber volume fraction were recormnended for the prediction of permeability.

关键词： capillary micro-flow fiber bundle permeability kozeny constant

capillary electrophoretic study on UDP-sugars in cells

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Science China Chemistry 2000年第1期43卷 85-93页

作者：许国旺 R.Lehmann 路鑫 H.M.Liebich 张玉奎卢佩章 National Chromatographic R. & A. Center Laboratory of Chromatography Dalian Institute of Chemical Physics Chinese Academy of Sciences Dalian 116011 China Medizinische Universitaetsklinik Tuebingen Tuebingen 72076 Germany

Glucose is an important regulator of cell growth and metabolism. Uridine diphosphate sugars (UDP-sugars), as the intermediate products of metabolism, play pivotal roles as precursors in the synthesis of complex carbohydrates and glycolipids as well as lectose. It is very important to study their metabolism in cells in clinical biochemistry. A capillary electrophoretic method has been developed for the analysis of UDP-sugars and nucleotides. By using an uncoated capillary (70cm×50μm) and 20 mmol/L borax buffer (pH 9), 4 important UDP-sugars can be analyzed in 15 min at 22 kV with satisfactory precision and sensitivity. The developed method has been applied to analyze UDP-sugars concentrations in lymphocytes, fibroblasts and mesangial cells, and the results show it not only is much better than HPLC method, but also can be used to measure the energy charge of cells.

关键词： cells glucose capillary electrophoresis UDP-sugars hexosamines.