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Cholesteric liquid crystals doped with dodecylamine for detecting aldehyde vapors.
MedLine Citation:
PMID:  21630648     Owner:  NLM     Status:  Publisher    
Abstract/OtherAbstract:
In this paper, we report a study of using cholesteric liquid crystals (CLCs) doped with dodecylamine for detecting aldehyde vapors. CLCs doped with dodecylamine show color change from red to yellow green upon exposure to 300 ppmv of pentyl aldehyde within 60 s. In contrast, no colorimetric response is observed when pure CLCs are used. Characterization by using FTIR shows that the possible mechanism responsible for the colorimetric response is the formation of imine bond between dodecylamine and pentyl aldehyde. A new C=N peak at 1670 cm-1 appears in the spectrum after the exposure to aldehyde vapors. The CLCs doped with dodecylamine show good selectivity for pentyl aldehyde; they do not respond to 200 ppmv of pentyl alcohol, pentylamine, acetone, ethanol, and water vapor. This study demonstrates the potential applications of doped-CLCs as low-cost and portable gas sensors.
Authors:
Laura Sutarlie; Jia Yi Lim; Kun-Lin Yang
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Publication Detail:
Type:  JOURNAL ARTICLE     Date:  2011-6-1
Journal Detail:
Title:  Analytical chemistry     Volume:  -     ISSN:  1520-6882     ISO Abbreviation:  -     Publication Date:  2011 Jun 
Date Detail:
Created Date:  2011-6-2     Completed Date:  -     Revised Date:  -    
Medline Journal Info:
Nlm Unique ID:  0370536     Medline TA:  Anal Chem     Country:  -    
Other Details:
Languages:  ENG     Pagination:  -     Citation Subset:  -    
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