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KMID : 1059519930370030302
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Journal of the Korean Chemical Society
1993 Volume.37 No. 3 p.302 ~ p.308
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Swelling Behavior and Hydration Number of Langmuir-Blodgett Films of Metal-Palmitate Deposited on a Piezoelectric Quartz Crystal Plate
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Chung Jong-Jae
Seo Byung-Il
Lee Hai-Won
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Abstract
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Monolayers of calcium palmitate were deposited on a piezoelectric quartz crystal plate by the Langmuir-Blodgett(LB) technique, and it was found from frequency changes of the quartz crystal deposited LB films. The usual carbonyl absorbance at 1704 cm-1 was replaced by the split band in the 1540∼1590 cm-1. The two absorptions at 1580 cm-1 and 1540 cm-1 were assigned to the antisymmetric stretching vibration of the calcium carboxylate group and the hydrated species due to the lowering carbonyl stretching frequency by hydrogen bonding respectively. Besides, it was demonstrated by X-ray diffraction analysis. The swelling behaviour of LB films in water phase at 23℃ was observed from the frequency change of the LB films deposited quartz crystal with time. Calcium palmitate LB films has been found to swell substantially in water without flaking, whereas hexadecanol LB films hardly swelled in water. Amount of swelling of calcium palmitate LB films was equivalent to 47 wt.% of the dry LB films, which means that ca. 7 water molecules were incorporated per calcium palmitate amphiphile. Chemical structure of calcium palmitate LB film was estimated as [CH3(CH2)14COO]2Ca·χH2O, and the hydration number was 1.
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