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Chemistry

Chemical engineering and processing

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Displaying 301 - 325 of 407

Development of a Microfluidic Rheometer for Complex Fluids

January 1, 2005
Author(s)
Jai A. Pathak, Robert F. Berg, Kathryn Beers
Our group has recently published a report of a combinatorial rheometer/viscometer developed in our lab, based on the princinple of a damped harmonic oscillator. In this paper, we describe a modification of this approach to scale down this viscometer to the

Refrigeration for Superconductors

September 20, 2004
Author(s)
Ray Radebaugh
Temperatures in the range of 0.05 to 80 K are required for most applications of superconductors. Refrigeration powers range from fractions of a watt for many electronic applications to kilowatts for some large magnet and power applications. This paper

A Buckling-Based Metrology for Measuring the Elastic Moduli of Polymeric Thin Films

August 1, 2004
Author(s)
Christopher Stafford, Eva Simonyi, C Harrison, Kathryn Beers, Alamgir Karim, Eric J. Amis, Mark R. VanLandingham, H C. Kim, W Volksen, R D. Miller
As technology continues towards smaller, thinner and lighter devices, more stringent demands are placed on thin polymer films as diffusion barriers, dielectric coatings, electronic packaging and so on. Therefore, there is a growing need for testing

Gas Flowmeter Calibrations with the 34 L and 677 L PVTt Standards

June 23, 2004
Author(s)
John Wright, Aaron Johnson, Michael Moldover, Gina Kline
This document provides a description of the 34 L and 677 L pressure, volume, temperature, and time (PVTt) primary gas flow standards operated by the National Institute of Standards and Technology (NIST) Fluid Flow Group. These facilities are used to

Elastic Flow Instability, Curved Streamlines and Mixing in Microfluidic Flows

February 1, 2004
Author(s)
Jai A. Pathak, David J. Ross, Kalman D. Migler
Flow instabilities are well known to occur in macroscopic flows when elastic fluids flow along curved streamlines. In this work we use flow visualization to study the mechanism underlying a purely elastic flow instability for Poiseuille flow in a micro (m)

Selective DNA Sensing Elements Integrated Into Microfluidic Channels

December 1, 2003
Author(s)
Rebecca A. Zangmeister, Michael J. Tarlov
This paper describes the development of a unique fluorescence based DNA diagnostic assay that does not require pre-labeling of the target oligomer prior to analysis. The assay uses polyacrylamide hydrogel plugs immobilized in microfluidic channels, and is

Temperature Metrology and Its Impact on Industry

September 1, 2003
Author(s)
Hratch G. Semerjian, Ellyn S. Beary
Temperature measurement represents one of the most frequently and broadly used measurements, with a majority of products manufactured having temperature measurement devices as an esential component. The accuracy and precision of these temperature

Refrigeration Methods for Superconductors

December 1, 2002
Author(s)
Ray Radebaugh
This chapter reviews various methods commonly used for achieving the cryogenic temperatures required of superconducting materials. The problems associated with cryogenic refrigerators (cryocoolers), such as poor reliability, low efficiency, electromagnetic

DNA Hydrogel Plugs Immobilized in Microfluidic Channels with Improved Stability

February 28, 2002
Author(s)
Rebecca A. Zangmeister, K G. Olsen, David J. Ross, Michael J. Tarlov
It has been previously demonstrated that DNA, modified on the 5' end with an acrylic acid group, can be incorporated into a polyacrylamide hydrogel matrix. These types of DNA containing gels have recently been immobilized in plastic microfluidic channels

Temperature Measurement and Control in Microfluidic Systems

October 1, 2001
Author(s)
David J. Ross, Michael Gaitan, Laurie E. Locascio
We describe a technique for the measurement of fluid temperatures in microfluidic systems based on temperature-dependent fluorescence. The technique is easy to implement with a standard fluorescence microscope and CCD camera. The efficiency of the method

1,6-Hexanedithiol Monolayers on Au(111): A Multi-Technique Structural Study

December 29, 2000
Author(s)
T Leung, M Gerstenberg, D J. Lavrich, G Scoles, F Schreiber, G Poirier
Monolayers of 1,6-hexanedithiol [HS(CH 2) 6SH] deposited on Au(111) from the gas phase were characterized by scanning tunneling microscopy (STM), grazing incidence X-ray diffraction (GIXD), and low energy atom diffraction (LEAD). Molecular resolution STM
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