کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
607852 1454605 2013 8 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Electroosmotic shear flow in microchannels
موضوعات مرتبط
مهندسی و علوم پایه مهندسی شیمی شیمی کلوئیدی و سطحی
پیش نمایش صفحه اول مقاله
Electroosmotic shear flow in microchannels
چکیده انگلیسی

We generate and study electroosmotic shear flow in microchannels. By chemically or electrically modifying the surface potential of the channel walls a shear flow component with controllable velocity gradient can be added to the electroosmotic flow caused by double layer effects at the channel walls. Chemical modification is obtained by treating the channel wall with a cationic polymer. In case of electric modification, we used gate electrodes embedded in the channel wall. By applying a voltage to the gate electrode, the zeta potential can be varied and a controllable, uniform shear stress can be applied to the liquid in the channel. The strength of the shear stress depends on both the gate voltage and the applied field which drives the electroosmotic shear flow. Although the stress range is still limited, such a microchannel device can be used in principle as an in situ micro-rheometer for lab on a chip purposes.

Figure optionsDownload high-quality image (45 K)Download as PowerPoint slideHighlights
► We generate and study electroosmotic shear flow in microchannels.
► The surface potential of the channel walls is modified chemically and electrically.
► An electrically controllable, uniform shear stress can be applied to the liquid.
► Such a device can be used as an in situ micro-rheometer for lab on a chip purposes.

ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Journal of Colloid and Interface Science - Volume 390, Issue 1, 15 January 2013, Pages 234–241
نویسندگان
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