![]() ![]() Example demonstrations include, prediction of osmotic pressure built up in thin pores subject to concentration gradient, propagation of deionization shocks and induced recirculations for intersecting pores with varying properties.Īctive control of surface charge property and electroosmotic flow (EOF) in a silica-based nanochannel using a field effect transistor (FET) is analyzed for the first time taking the Stern layer effect into account. By considering a hierarchy of canonical problems with increasing complexity, we demonstrate that the developed framework can capture a wide range of phenomena. Distinct advantages of the present framework include: a fully conservative discretization, fully bounded tabulated area-averaged coefficients without any singularity in the limit of infinitely thick electric double layers (EDLs), a flux discretization that exactly preserves equilibrium conditions, and extension to general network of pores with multiple intersections. We take into account the non-uniformity of potential and ion concentration profiles across the pore cross-section in the form of area-averaged coefficients in different flux terms representing fluid flow, electric current, and ion fluxes. Assuming that each pore in the network is long and thin, we derive a 1D model describing the transport in pore's longitudinal direction. ![]() We present here a reduced order computational model that treats a network of many pores via solutions to 1D equations. Capturing these phenomena by direct simulation of the governing equations in multiple dimensions is prohibitively expensive. These equations describe a wide range of transport phenomena that can interact in complex and highly nonlinear ways in networks involving multiple pores with variable properties. Coupling between fluid flow and ion transport in these networks is governed by the Poisson-Nernst-Planck-Stokes equations. We present an efficient and robust numerical model for simulation of electrokinetic phenomena in porous networks over a wide range of applications including energy conversion, desalination, and lab-on-a-chip systems. Using our model we predict the dependence of ζ potential, surface charge density, and capillary filling length ratio on ionic strength for different surface compositions, which can be difficult to achieve otherwise. ![]() To validate our model, we used both pH-sensitive dye-based capillary filling experiments as well as electro-osmotic current-monitoring measurements. Our theoretical model consists of three parts: (i) a chemical equilibrium model of the bare or coated wall, (ii) a chemical equilibrium model of the buffered bulk electrolyte, and (iii) a self-consistent Gouy-Chapman-Stern triple-layer model of the electrochemical double layer coupling these two equilibrium models. We develop a model that relaxes the assumption that the surface parameters C(1), C(2), and pK(+) are constant and independent of surface composition. I’ve also modeled for numerous conventions, Playboy, and as a runway model for the local clothing line called Kill Royal.We present a combined theoretical and experimental analysis of the solid-liquid interface of fused-silica nanofabricated channels with and without a hydrophilic 3-cyanopropyldimethylchlorosilane (cyanosilane) coating. ![]() It is an all organic spa and apothecary located in the heart of Uptown, Dallas. Now, I perform esthetic treatments at D Magazine’s “Best Spa in Dallas” called Spa Habitat. Since then I’ve worked all over the Metroplex as a model, laser technician and arch specialist. In 2009, I graduated from Paul Mitchell and was certified as an esthetician in the state of Texas. I also took part in my Varsity high school musical theatre class in various shows. I grew up in competitive dancing till the age of 16. My name is Amanda and I was born and raised in the Dallas/Forth Worth area. ![]()
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