dispersion – Page 4 – TechConnect Briefs

Processing and Characterization of Epon 862 reinforced with functionalized MWCNT’s

Theodore M., Hosur M.V., Thomas J., Jeelani S., Tusekgee University, US

In the current research work, functionalization of pristine MWCNTs was performed by oxidation in acid solution (MWCNT-COOH), direct-fluorination (MWCNT-F), and amino-functionalization (MWCNT-NH2). An epoxy-nanocomposite material was developed through the use of functionalized Multi-wall Carbon Nanotubes [...]

Morphological Consequence of Sonication on Lignin-CNT-Epoxy Composite

Thomas D., Edwards J., Parker R., Ku C.-L., Bryan D., Liao Y-H, Liang R., Florida A & M University, US

This project will utilize SEM and molecular modeling analysis to determine morphological consequences of presonication time on lignin particle size and the joint sonication of lignin with CNT. The investigation will yield a more fundamental [...]

Nanoparticle Composites for Coating Applications

Cayton R.H., Nanophase Technologies Corporation, US

Nanoparticles can be incorporated into polymeric coatings to enable significant improvement in targeted properties, i.e., scratch resistance, UV resistance, conductivity, etc. Commercial processing methods have been developed to surface treat nanoparticles to render compatibility between [...]

Composable System Simulation of Dispersion in Complex Electrophoretic Separation Microchips

Wang Y., Lin Q., Mukherjee T., Carnegie Mellon University, US

This paper presents a composable system simulation framework for electrophoretic separation microchips, using an analog hardware description language integrating analytical dispersion models that describe not only the behavior of individual components, but also the interactions [...]

Numerical Simulation of Field Amplified Sample Stacking in Microfluidic System

Feng J.J., Krishnamoorthy S., Sundaram S., Bhardwaj R., Santiago J.G., CFD Research Corporation, US

In this paper we developed a numerical simulation method that solves the transport phenomenon associated with sample stacking in microchip-based separation system. The model is based on thin double layer approximation where the electrostatic force [...]

A Simple Description of Turn-induced Transverse Field Dispersion in Micrlfluidic Channels for System-Level Design

Magargle R.M., Hoburg J.F., Mukherjee T., Carnegie Mellon University, US

This abstract shows a simple analytical model for turn-induced dispersion that captures an essential aspect of the transition field from uniform to circumferential that has been ignored in prior simple descriptions. The model applies directly [...]

Study of Sample Dispersion Mechanisms in an Electroosmotically Pumped Microchannel

Debusschere B., Najm H., Matta A., Knio O., Ghanem R., Le Maitre O., Sandia National Laboratories, US

In many microfluidic separation processes, dispersion of sample peaks is a significant problem limiting the detection resolution. In this work, we use simulations to study the dominant dispersion mechanisms during a protein labeling process in [...]

Modeling of Joule Heating in Electrophoretic Separation Microchips

Wang Y., Lin Q., Hoburg J.F., Mukherjee T., Carnegie Mellon University, US

This paper presents a model for Joule heating induced analyte dispersion in electrophoretic separation channels with a rectangular cross section. The model is in closed form and captures the effect of cross-sectional geometry. Three-dimensional numerical [...]

Electroosmotic Flow and Zone Broadening in Microfluidic Channels of Variable Cross-Section and Wall Charge

Ghosal S., Lu Z., Northwestern University, US

Electroosmotic flow is often the method of choice for generating fluid flows in micro fluidic devices. The resulting flow has a characteristic at profile which has the advantage of very low axial dispersion. This is [...]

Inverted Method for Simulation of Electrokinetic Transport in Microchannel Devices

Nilson R.H., Griffiths S.K., Sandia National Laboratories, US

An inverted method of solution is used to numerically solve the equations governing electrokinetic fluid flow and species transport in microscale turns, junctions and curved channels. Rather than solving for the electric potential and fluid [...]