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APS March Meeting 2010 Portland, Oregon APS March Meeting 2010 Portland, Oregon http://www.aps.org/meetings/march/index.cfm i Monday, March 15, 2010 8:00AM - 11:00AM — Session A12 DFD: Microfluidics I: Electrokinesis and Transport B110-B111 8:00AM A12.00001 Flow Regimes and Parametric Competitions in Nanochannel Flows CHONG LIU, ZHIGANG LI, Department of Mechanical Engineering, The Hong Kong University of Science and Technology, Clear Water Bay, Kowloon, Hong Kong — Nanoscale fluid flow systems involve both micro- and macroscopic parameters, which compete with each another and lead to different flow regimes. In this work, we investigate the competitions of four fundamental parameters, including the fluid-fluid, fluid-wall binding energies, temperature of the system, and driving force. By illustrating the fluid flux as a function of a dimensionless number, which represents the effective surface effect on the fluid, we show that the fluid motion in nanochannels falls into different regimes. For small fluid-fluid self-binding energy, there are three flow regimes; as the dimensionless number increases, the flux undergoes a transition from fluid-wall binding energy independent to temperature independent. If the fluid-wall binding energy is of the order of room temperature, there is a critical value for the dimensionless number, which divides the flow into weak and strong fluid-wall interaction regimes. Each of these regimes is associated with a distinct mechanism which reveals the competitions of the parameters. 8:12AM A12.00002 Microfluidic Chemical Concentration Switching at Taylor’s Limit1 , EBERHARD BODENSCHATZ, ALBERT BAE, LASSP, Cornell University, Ithaca and MPI for Dynamics and Selforganization, Goettingen, CARSTEN BETA, Institute for Physics and Astronomy, University of Potsdam and MPI for Dynamics and Selforganization, Goettingen — In this talk, we will discuss the time for switching chemical concentrations in microfluidic devices. The limits of rapid switching are analyzed based on the theory of dispersion by Taylor and Aris and compared to both experiments and numerical simulations. We conclude by comparing the performance of various switching techniques. 1This work was supported by the Deutsche Forschungsgemeinschaft (SPP 1128) and the Max Planck Gesellschaft. 8:24AM A12.00003 Film Relaxation and Pressure-Saturation Hysteresis in a Wedge-shaped Microfluidic Channel1 , YIHONG LIU, Purdue University, LAURA PYRAK-NOLTE, DAVID NOLTE — Wetting-phase films play important roles in the fluid distribution and pressure-saturation behavior of porous media, but are often difficult to quantify because of their complex geometry. We used fluorescent confocal microscopy to image three-dimensional water-films in 40 µm deep wedge-shaped microfluidic channel. The microfluidic channels were fabricated from photoresist on a cover glass using two methods to achieve different wall roughness: a) two-photon laser machining, and b) UV-illumination. From the confocal images, we experimentally acquired the movement and transformation of the films and the time-dependent volume, thickness, and length of the films at controlled pressures. We also observe hysteresis in the capillary pressure vs. saturation behavior in this simple geometry when performing imbibition and drainage scanning. The wetting film, as an extension of the wetting phase, strongly increases the interaction area of the wetting phase (water) with the non-wetting phase (air) and the solid phase (channel), which contributes irreversible effects to hysteresis mechanisms. 1Acknowledgment: ARRA & the National Science Foundation (0911284-EAR). 8:36AM A12.00004 Fluidic rectification due to asymmetric concentration polarization at nano- microfluidic interface , JARROD SCHIFFBAUER, KATHLEEN RESCHKE, West Virginia University, BORIS ZALTZMAN, Ben Gurion Univerisity, BOYD EDWARDS, West Virginia University, ISAAK RUBINSTEIN, Ben Gurion Univerisity, WILL BOOTH, AARON TIMPERMAN, West Virginia University — A simple 1D locally electroneutral (LEN) electro-diffusive model explains steady-state fluidic rectification in terms of asymmetry in the diffusion layers flanking a charge-selective element such as a porous membrane or nano-pore. The selectivity in such systems is a function of the diffusion layer asymmetry and applied voltage. Rectification is experimentally demonstrated in a microfluidic system utilizing a charge selective membrane with symmetric nanopores where the asymmetry of the diffusion layers is attributed to the geometric asymmetry in the fluidic portion of the system. Results for devices with different cross-sections on either side of the membrane verify that increasing asymmetry in the geometry, hence diffusion layers, increases the strength of the observed rectification as predicted by the theory. 8:48AM A12.00005 Photo-manipulation of a liquid droplet by chromocapillary effect , ARNAUD SAINT-JALMES, Institut de Physique de Rennes - CNRS, ANTOINE DIGUET, Departement de Chimie, ENS-Paris, REINE-MARIE GUILLERMIC, Institut de Physique de Rennes , NOBUYUKI MAGOME, KENISHI YOSHIKAWA, Kyoto University, YONG CHEN, DAMIEN BAIGL, Departement de Chimie, ENS-Paris — Using simply light at different wavelengths, we show how an oil droplet floating on an aqueous solution can be trapped and rapidly moved along any desired shapes. The technique is based on the presence of a surfactant (adsorbed at the oil-water interface) which configuration and polarity change with the light wavelength. A partial illumination of the droplet, with either visible or UV light, is first used to create wavelength-dependent interfacial tension gradients, meaning that the gradient direction depends on the wavelength of the illumination. Such chromocapillary gradients are then able to induce interfacial flows, finally resulting in reversible droplet motions in directions depending on the light wavelength. By combining ultraviolet and visible light, we then made a chromocapillary trap to capture a droplet on the liquid surface. The trapped droplet can be dragged across the surface at 300 microns per second by moving the trap around. We discuss the potential use of chromocapillary effects in microfluidic devices and in light-responsive materials. 9:00AM A12.00006 Suppression of Brownian motion by electrodynamic confinement in aque- ous solution , WEIHUA GUAN, MARK REED, Department of Electrical Engineering, Yale University, SONY JOSEPH, PREDRAG KRSTIC, Physics Division, Oak Ridge National Laboratory — Trapping and manipulating single molecule or colloid particles in aqueous solution provides the opportunity to study intrinsic individual characteristics rather than averaged ensemble properties. In this study, a planar aqueous electrodynamic trap on a chip is fabricated and studied. Individual charged particles can be trapped in aqueous solution by a “Paul trap” type rotating electric field. The trap utilizes the strong alternating electrophoretic force and dynamically traps charged particles in the center of the planar device. The trap is characterized by investigating the stable trapping region with its characteristic driving parameters. The impact of the Brownian noise on the stability of the trapping and on the root- mean-square (rms) value of the position fluctuations are investigated. Compared to conventional Paul trap which works in vacuum or gaseous phase, our electrodynamic trap demonstrates for the first time a successful aqueous trapping. This technique opens the possibility to spatially control the object in aqueous solution and can lead to lab-on-a-chip systems controlling single molecules. 9:12AM A12.00007 Two-dimensional mapping of dielectrophoresis force and AC electro- osmosis flow , JINGYU WANG, H.D. OU-YANG, Lehigh University — In an AC electric field, colloids in an aqueous suspension are subjected to different electrokinetic forces. Charged particles will experience a frequency dependent dielectrophoresis (DEP) force due to the polarizability response of the associated double layers, causing particle movement. At the cross-over frequency when the double layers cannot fully respond to the field, this force tends to zero. For free ions in solution, Coulomb forces exerted on them near the electrodes can produce fluid flows through AC-electro-osmosis (ACEO). As DEP and ACEO depend quadratically on the field strength, it is difficult to distinguish the contribution of each force exerted on a particle. To differentiate DEP and ACEO, we used optical tweezers to track individual particle motion to pin-point the DEP cross-over frequencies at locations where ACEO is negligible. We then mapped out the ACEO flow patterns at the cross-over frequency of zero DEP force. Moreover, as the cross-over frequency was a function of particle size, we were able to determine the scaling of the ACEO flow with the applied field frequency. 9:24AM A12.00008 Destruction of Emulsions by an AC Electric Field: Importance of Partial Merging1 , ABDOU RACHID THIAM, NICOLAS BREMOND, JEROMEˆ BIBETTE, LCMD-ESPCI-PECSA-CNRS — Electrocoalescence is basically the process of blending droplets by the application of an electric field. The approach is used in petroleum refineries for the separation of water in oil emulsions (that is, by coalescing water droplets), and more recently in biotechnology industry, for the fusion of micro reactors. In a first step, we will focus on the coalesce condition for two drops under a given electric field. Microfluidics offers a comfortable setup therefore, as we sought to span a range of initial conditions in terms of the distance between the droplets, their sizes, and also a region of the applied electric field. Thus, we could establish
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