Application of a quartz-crystal microbalance for detection of phase transitions in liquid crystals and lipid multibilayers
- Tokyo Institute of Technology (Japan)
Resonance frequency increased abruptly at the phase transition temperature (T{sub c}) from solid to liquid crystalline state of liquid crystals (LCs) or lipid multibilayer films cast on a quartz-crystal microbalance (QCM) electrode when the ambient temperature increased gradually. The large frequency enhancement at the T{sub c} was observed in the case of smectic LC-coated QCM compared with those of nematic and cholesteric LC-coated QCM. Although the frequency enhancement at the T{sub c} of the LC-coated QCM was observed independent of media such as water and air phases, the frequency of the lipid multibilayer-coated QCM increased abruptly at the T{sub c} only in a water phase, but not in an air phase. Frequency enhancements at T{sub c} can be explained by slipping between layered structures of smectic LC and lipid multibilayer in the fluid liquid crystalline state above the T{sub c}. In the case of lipid multibilayers, the penetration of water into interlayers (swelling) occurs at the T{sub c} and then the frequency increase is observed due to slipping between hydrated and fluid layers only in aqueous phases.
- OSTI ID:
- 5410483
- Journal Information:
- Analytical Chemistry (Washington); (United States), Vol. 61:19; ISSN 0003-2700
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
37 INORGANIC
ORGANIC
PHYSICAL AND ANALYTICAL CHEMISTRY
LIQUID CRYSTALS
PHASE STUDIES
FILMS
MEASURING INSTRUMENTS
MEASURING METHODS
MICROBALANCES
TRANSITION TEMPERATURE
BALANCES
CRYSTALS
FLUIDS
LIQUIDS
PHYSICAL PROPERTIES
THERMODYNAMIC PROPERTIES
WEIGHT INDICATORS
360602* - Other Materials- Structure & Phase Studies
400100 - Analytical & Separations Chemistry