نتایج جستجو برای: electroosmotic

تعداد نتایج: 802  

Journal: :Analytical chemistry 2000
Oleschuk Shultz-Lockyear Ning Harrison

A 330-pL chromatographic bed was fabricated on a glass substrate as part of an electroosmotically pumped microfluidic system. Two weirs within a sample channel formed a cavity in which octadecylsilane (ODS) coated silica beads (1.5-4 microns diameter) were trapped. ODS beads were mobilized into and out of the cavity using electroosmotic flow through a bead-introduction channel which accessed th...

Journal: :Journal of chromatography. A 2002
Yi-Yun Hsieh Ya-Hsien Lin Jr-Shiung Yang Guor-Tzo Wei Pei Tien Lai-Kwan Chau

A simple coating procedure employing a sol-gel process to modify the inner surface of a bare fused-silica capillary with a positively charged quaternary ammonium group is established. Scanning electron microscopic studies reveal that a smooth coating with 1 to approximately 2 microm thickness can be obtained at optimized coating conditions. With 40 mM citrate as a running electrolyte, the plot ...

Journal: :Lab on a chip 2012
Mercedes C Morales Hao Lin Jeffrey D Zahn

Sample pre-concentration can be a critical element to improve sensitivity of integrated microchip assays. In this work a converging Y-inlet microfluidic channel with integrated coplanar electrodes was used to investigate transverse DNA and protein migration under uniform direct current (DC) electric fields to assess the ability to concentrate a sample prior to other enzymatic modifications or c...

Journal: :Analytical chemistry 2001
J G Santiago

Emerging microfluidic systems have spurred an interest in the study of electrokinetic flow phenomena in complex geometries and a variety of flow conditions. This paper presents an analysis of the effects of fluid inertia and pressure on the velocity and vorticity field of electroosmotic flows. In typical on-chip electrokinetics applications, the flow field can be separated into an inner flow re...

Journal: :Journal of advanced manufacturing science and technology 2023

Electroosmosis is one of the most used actuation mechanisms for microfluidics in current active lab-on-chip devices. It generated on induced charged microchannel walls contact with an electrolyte solution. Electrode distribution plays key role providing external electric field electroosmosis, and determines performance electroosmotic microfluidics. Therefore, this paper proposes a topology opti...

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