TITLE

Electrothermal ac electro-osmosis

AUTHOR(S)
Gagnon, Zachary R.; Chang, Hsueh-Chia
PUB. DATE
January 2009
SOURCE
Applied Physics Letters;1/12/2009, Vol. 94 Issue 2, pN.PAG
SOURCE TYPE
Academic Journal
DOC. TYPE
Article
ABSTRACT
Two ac polarization mechanisms, charge accumulation due to electrode double layer charging and bulk permittivity/conductivity gradients generated by Joule heating, are combined in the double layer by introducing zwitterions to produce a new ac electrokinetic pump with the largest velocity (>1 mm/s) and flow penetration depth (100 μm) reported for low-conductivity fluids. The large fluid velocity is due to a quartic scaling with respect to voltage, as is true of electrothermal flow, but exhibits a clear maximum at a frequency corresponding to the electrode double layer inverse RC time.
ACCESSION #
36258501

 

Related Articles

  • Electrokinetic ‘ratchet’ pumps for microfluidics. Ajdari, A. // Applied Physics A: Materials Science & Processing;2002, Vol. 75 Issue 2, p271 

    The symmetry argument underlying ‘ratchet’ schemes for the motion of molecular motors and for selective transport of particles is shown to yield new means for the pumping of liquids. A practical realization consists in using surfaces bearing polar periodic arrays of electrodes...

  • Anomalous field-induced particle orientation in dilute mixtures of charged rod-like and spherical colloids. Mantegazza, F.; Caggioni, M.; Jiménez, M. L.; Bellini, T. // Nature Physics;Nov2005, Vol. 1 Issue 2, p103 

    Charged colloids in aqueous suspension often reconfigure counter-intuitively in the presence of an external electric field. Despite decades of substantial theoretical effort, a clear understanding of such electrokinetic phenomena is only available for the electric polarization and migration of...

  • Self-correction of field-effect transistor characteristics in the mode of spontaneous space-charge ion polarization of gate oxide. Zhdan, A. G.; Naryshkina, V. G.; Chucheva, G. V. // Semiconductors;May2009, Vol. 43 Issue 5, p677 

    Spontaneous space-charge ion polarization of gate oxide in the inversion n-channel silicon field-effect transistor was accomplished in the mode of its Joule heating by the drain current Id. The transistor characteristics measured at room temperature ( Tr) before and after thermal-field treatment...

  • Separation processes based primarily on action in an electric field. Rangarajan, S. // Chemical Business;Jan2010, Vol. 24 Issue 1, p41 

    The article focuses on separation processes which are based mainly on action in an electric field. The theory of electrical separations is discussed. It defines the four related elektrokinetic phenomena, namely, electrophoresis, sedimentation potential, electroosmosis and streaming potential....

  • Discrete solution of the electrokinetic equations. Capuani, Fabrizio; Pagonabarraga, Ignacio; Frenkel, Daan // Journal of Chemical Physics;7/8/2004, Vol. 121 Issue 2, p973 

    We present a robust scheme for solving the electrokinetic equations. This goal is achieved by combining the lattice-Boltzmann method with a discrete solution of the convection-diffusion equation for the different charged and neutral species that compose the fluid. The method is based on...

  • Electrokinetic effects on detection time of nanowire biosensor. Liu, Yaling; Guo, Qingjiang; Wang, Shunqiang; Hu, Walter // Applied Physics Letters;4/9/2012, Vol. 100 Issue 15, p153502 

    We develop a multiphysics model to study the contribution of electrokinetics on the biomolecular detection process and provide a physical explanation of the two to three orders of magnitude difference in detection time between experimental results and theoretical predications at ultralow...

  • Analytical solution of electro-osmotic flow in a semicircular microchannel. Chang-Yi Wang; Ying-Hong Liu; Chang, Chien C. // Physics of Fluids;Jun2008, Vol. 20 Issue 6, p063105 

    The electro-osmotic flow through a microchannel with a semicircular cross section is studied under the Debye–Huckel approximation. Analytical series solutions are found for two basic cases. The solutions for the two basic cases considered can be superposed to yield solutions for any...

  • Simple and reusable picoinjector for liquid delivery via nanofluidics approach. Li, Shunbo; Cao, Wenbin; Hui, Yu; Wen, Weijia // Nanoscale Research Letters;Dec2014, Vol. 9 Issue 1, p1 

    Precise control of sample volume is one of the most important functions in lab-on-a-chip (LOC) systems, especially for chemical and biological reactions. The common approach used for liquid delivery involves the employment of capillaries and microstructures for generating a droplet which has a...

  • Numerical Simulation of Bioparticle Manipulation Using Dielectrophoresis. Neculae, A.; Bunoiu, O. M.; Lungu, M. // AIP Conference Proceedings;8/3/2010, Vol. 1262 Issue 1, p144 

    The manipulation of biological particles (cells, viruses DNA, proteins) is an important research subject in microfluidics. The dielectrophoresis (DEP) based on AC electrokinetics became one of the most widely used tools in particle separation, due to the low operating voltage (1–20 V),...

Share

Read the Article

Courtesy of VIRGINIA BEACH PUBLIC LIBRARY AND SYSTEM

Sorry, but this item is not currently available from your library.

Try another library?
Sign out of this library

Other Topics