Dependence of Ion Selectivity on Ordered Orientation of Neutral Carriers in Ion-Sensing Membranes Based on Thermotropic Liquid Crystals

Thermotropic liquid-crystalline compounds were applied as membrane materials (membrane solvent and neutral carrier) for neutral carrier-type ion sensors to investigate how the ordered arrangement of neutral carriers affects the property of the resulting ion sensors. Nematic, smectic, and cholesteric...

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Bibliographic Details
Published in:Analytical chemistry (Washington) 2002-11, Vol.74 (21), p.5544-5549
Main Authors: Kimura, Keiichi, Kawai, Yoshikazu, Oosaki, Shusuke, Yajima, Setsuko, Yoshioka, Yayoi, Sakurai, Yoshiaki
Format: Article
Language:English
Subjects:
Analytical chemistry
Chemistry
Crystallization
Crystals
Electrochemical methods
Ethers, Cyclic - chemistry
Exact sciences and technology
General, instrumentation
Ion-Selective Electrodes
Ions
Membranes
Membranes, Artificial
Potassium - analysis
Sensors
Sodium - analysis
Spectrophotometry, Infrared - methods
Temperature
X-Ray Diffraction
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Summary:Thermotropic liquid-crystalline compounds were applied as membrane materials (membrane solvent and neutral carrier) for neutral carrier-type ion sensors to investigate how the ordered arrangement of neutral carriers affects the property of the resulting ion sensors. Nematic, smectic, and cholesteric liquid-crystalline compounds were used as the membrane solvents and crown ether derivatives with a molecular structure similar to the liquid-crystalline solvent as the K+ neutral carriers. Polarized IR spectroscopy and X-ray diffraction experiments confirmed that the highly ordered arrangement of membrane components was retained in the liquid-crystal-based ion-sensing membranes containing a neutral carrier and a lipophilic salt. The ordered arrangement of neutral carriers in the liquid-crystalline membranes enhanced the ion selectivity significantly, probably due to the efficient cooperation of two adjacent crown ether moieties in the highly ordered and aggregated state.
ISSN:0003-2700
1520-6882
DOI:10.1021/ac025787l