The Dow Chemical Company

University of Washington

Paul J O'Connor

Stephen E Bales

Donald J Perettie

James C Tou

Ing-Feng Hu

Richard G Melcher

James H Sedon

Ing-Fen Hu

Steve D Jons

The present invention is a covered microchannel comprising: a) a substrate; b) an etched material adhered to the substrate; and c) a silicon-carbon material adhered to the etched material in such a manner to form a covered microchannel; wherein the silicon-carbon material comprises SiO.sub.1.8-2.4 C.sub.0.3-1.0 and H.sub.0.7-4.0 containing at least one of the following functional groups:

Covered microchannels and the microfabrication thereof

The present invention is a laminate which comprises:

Coated plastic substrate

A reversed permeation membrane assembly and method for collecting one or more compounds of interest from a sample solution. The membrane assembly includes a semi-permeable membrane of predetermined thickness and length, and having inner and outer surfaces. The membrane is attached adjacent its outer surface to a substantially rigid membrane support, and a non-porous barrier contacts the outer surface of the membrane to prevent permeation of compounds beyond the outer surface in use. In a preferred embodiment, the semi-permeable membrane assumes a substantially tubular conformation through which sample solution may be passed. The membrane support also preferably features a tubular conformation within which the semi-permeable membrane is mounted. Because of its unique structure and improved efficiency, the assembly of the present invention may be incorporated for in-line use with liquid and gas chromatography devices and GC/MS units. In some applications, the extractant can even be flowed through the membrane cell to collect analytes and directly to an LC column for analysis in a substantially non-stop manner.

Apparatus and method for reversed permeation membrane extraction of

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Midland, MI, United States of America

Paul J O'Connor