Development of an advanced nanocalorimetry system for rapid material characterizations

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Title: Development of an advanced nanocalorimetry system for rapid material characterizations
Author: Liu, Yen-Shan
Abstract: The development of a versatile system capable of providing rapid , portable , and inexpensive detection of explosives and energetic compounds is needed critically to offer an enhanced level of protection against current and future threats to homeland security , as well as to satisfy a wide range of applications in the fields of forensic analysis , emergency response , and industrial hazards analysis . The hand -held nanocalorimeter will serve as a first -of -its -kind screening tools for explosive and energetic compounds directly in the settings where they are needed with high efficiency , reduced cost , and simplicity with ease of use . Unlike current explosives detectors , this system is based on calorimetric techniques that are inherently capable of providing direct measurements of energy release potential and therefore do not depend on prior knowledge of familiar compounds . The microfabricated calorimetry instrument consists of (i ) a thermal control module incorporating arrays of microfabricated heaters and temperature sensors , as well as any necessary electronic interconnections , and (ii ) a sample encapsulation module incorporating etched enclosures designed to accommodate either solid or liquid samples . Initial work has led to successful fabrication of a chip capable of sampling nano -sized solid or liquid compounds . Control algorithms incorporating the DSC principle have also been written using LabVIEW . Device performance of the original and redesigned chips were tested by studying the thermal transitions associated with the boiling points of acetone and pentane . With the redesigned chip , the heat loss issue was reduced : the measured input heat was reduced from 32 times of the required energy to 5 times of the required energy . Future work will focus on modifying the chip design and control algorithm to improve accuracy and sensitivity , developing a trace analysis software to link it to a database of explosive information , and adapting different fabrication procedures for high temperature operation and large scale production .
URI: http : / /hdl .handle .net /1969 .1 /4834
Date: 2007-04-25

Citation

Development of an advanced nanocalorimetry system for rapid material characterizations. Available electronically from http : / /hdl .handle .net /1969 .1 /4834 .

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