نتایج جستجو برای: electrokinetic effect

تعداد نتایج: 1643637  

Journal: :Langmuir : the ACS journal of surfaces and colloids 2005
Jin-Pei Deng Chunhung Wu Cheng-His Yang Chung-Yuan Mou

Gold nanoparticles prepared by chemical reduction in sodium dodecyl sulfate (SDS) solution are size-controlled with the addition of pyrene. Micellar electrokinetic capillary chromatography (MEKC) is applied to the system to examine the size and polydispersity of gold nanoparticles and to show that pyrene has the extraordinary effect in decreasing the size and narrowing the dispersity of gold na...

Journal: :IOP conference series 2021

The climate change affects the coastal infrastructure including ports. This effect is through changes in tides, waves, wind and erosion. As a result, sedimentation harbours area increases therefore there need for more regular dredging as well adaption to reduce vulnerability. More frequent means higher amount of sediments be disposed or treated. One methods proposed impact high reducing environ...

2013
Ranabir Dey Suman Chakraborty

Thermal characteristics of pressure-driven, power-law fluid flows through narrow confinements are analyzed following a semi-analytical approach, by taking into consideration the electrokinetic effects beyond the Debye-Hückel limit. The influence of the induced streaming potential on the flow velocity, temperature and Nusselt number are delineated for parametric variations of the ionic Peclet nu...

Journal: :Lab on a chip 2010
Aigars Piruska Sean P Branagan Alexandra B Minnis Zhen Wang Donald M Cropek Jonathan V Sweedler Paul W Bohn

The introduction of metallic elements into microfluidic devices that support electrokinetic transport creates several fundamental issues relative to the high conductivity of the metal, which can act as a current shunt, causing profound effects on the transport process. Here we examine the use of Au-coated nanocapillary array membranes (Au NCAMs) as electrically addressable fluid control element...

2013
Michael B. Sano Roberto C. Gallo-Villanueva Blanca H. Lapizco-Encinas Rafael V. Davalos

Microfluidics is a rapidly growing field that offers great potential for many biological and analytical applications. There are important advantages that miniaturization has to offer, such as portability, shorter response times, higher resolution and sensitivity. There is growing interest on the development of microscale techniques. Among these, electrokinetic phenomena have gained significant ...

Journal: :The European physical journal. E, Soft matter 2013
Jiajia Zhou Friederike Schmid

We study the response of a spherical colloid under alternating electric fields (AC fields) by mesoscopic simulation method, accounting in full for hydrodynamic and electrostatic interactions. We focus on a special case of uncharged colloids. The main polarization mechanism is the "volume polarization", where ionic currents are deflected by the core of the uncharged colloid. Specifically, we com...

Journal: :Biomicrofluidics 2008
Kai Yang Jie Wu

Orthogonal electrodes have been reported to produce high velocity microflows when excited by ac signals, showing potential for micropumping applications. This paper investigates the microflow reversal phenomena in such orthogonal electrode micropumps. Three types of microflow fields were observed by changing the applied electric signals. Three ac electrokinetic processes, capacitive electrode p...

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