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Title: Shape-Selectivity with Liquid Crystal and Side-Chain Liquid Crystalline Polymer SAW Sensor Interfaces

A liquid crystal (LC) and a side-chain liquid crystalline polymer (SCLCP) were tested as surface acoustic wave (SAW) vapor sensor coatings for discriminating between pairs of isomeric organic vapors. Both exhibit room temperature smectic mesophases. Temperature, electric-field, and pretreatment with self-assembled monolayers comprising either a methyl-terminated or carboxylic acid-terminated alkane thiol anchored to a gold layer in the delay path of the sensor were explored as means of affecting the alignment and selectivity of the LC and SCLCP films. Results for the LC were mixed, while those for the SCLCP showed a consistent preference for the more rod-like isomer of each isomer pair examined.
Authors:
; ; ; ; ; ;
Publication Date:
OSTI Identifier:
14047
Report Number(s):
SAND99-2468C
TRN: AH200136%%289
DOE Contract Number:
AC04-94AL85000
Resource Type:
Conference
Resource Relation:
Conference: 12th European Conference on Solid-State Transducers, Netherlands, 09/12/1999--09/15/1999; Other Information: PBD: 23 Sep 1999
Research Org:
Sandia National Labs., Albuquerque, NM (US); Sandia National Labs., Livermore, CA (US)
Sponsoring Org:
US Department of Energy (US)
Country of Publication:
United States
Language:
English
Subject:
47 OTHER INSTRUMENTATION; 54 ENVIRONMENTAL SCIENCES; SOUND WAVES; ALKANES; COATINGS; LIQUID CRYSTALS; POLYMERS; ORGANIC COMPOUNDS; VOLATILE MATTER; DETECTION; PERFORMANCE; MONITORS; VAPOR SENSOR; SAW SENSOR; LIQUID CRYSTAL; SELF-ASSEMBLED MONOLAYER; SHAPE SELECTIVITY