John E Hawk

US Patent:

7207206, Apr 24, 2007

Filed:

Feb 16, 2005

Appl. No.:

11/059170

Inventors:

Lal A. Pinnaduwage - Knoxville TN, US
Thomas G. Thundat - Knoxville TN, US
Gilbert M. Brown - Knoxville TN, US
John Eric Hawk - Olive Branch MS, US
Vassil I. Boiadjiev - Knoxville TN, US

Assignee:

UT-Battelle, LLC - Oak Ridge TN

International Classification:

G01N 7/00

US Classification:

73 232

Abstract:

A chemically functionalized cantilever system has a cantilever coated on one side thereof with a reagent or biological species which binds to an analyte. The system is of particular value when the analyte is a toxic chemical biological warfare agent or an explosive.

US Patent:

20060032289, Feb 16, 2006

Filed:

Feb 7, 2005

Appl. No.:

11/052556

Inventors:

Lal Pinnaduwage - Knoxville TN, US
Dechang Yi - Oak Ridge TN, US
Thomas Thundat - Knoxville TN, US
John Hawk - Germantown TN, US

International Classification:

G01N 27/14

US Classification:

073025050, 073031020

Abstract:

A two-track piezoresistive cantilever detects explosives in ambient air by measuring resistance changes in the cantilever when one piezoresistive track is pulse heated to cause deflagration of explosive adhered to the surface of the cantilever. The resistance measurement is through the second piezoresistive track, which is located at the most resistance-sensitive area. The resistance change of this track is caused by the temperature change of the cantilever as well as the bending of the cantilever due to bi-material thermal expansion. The detecting method using this novel cantilever avoids the use of any optical components such as a laser and position sensing detector (PSD), which are necessary in traditional detecting systems using cantilevers. Therefore, it can extremely reduce the complexity of the detecting system and make a portable chemical detection system possible that is small, less expensive, and able to be mass produced and is particularly useful for the detection of explosives.