Studies on the area-temperature isobars of insoluble monolayers at air/water interface. I. Development of a microcomputer-controlle instrument for measuring precise area-temperature isobars.
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A microcomputer-controlled instrument for measuring precise area–temperature (<I>A</I>–<I>T</I>) isobars of insoluble monolayers at the air/water interface was developed. To obtain precise <I>A</I>–<I>T</I> isobars, leakage or dissolution of film material must be checked. Before starting <I>A</I>–<I>T</I> isobar measurements, area or structural relaxations must be completed. <I>A</I>–<I>T</I> isobars of monolayers of cadmium eicosanoate, L-α-dipalmitoyl phosphatidylcholine (DPPC), trioctadecanoyl glyceride (TOG), and <I>cis</I>-9-octadecen-1-ol were measured. Precise <I>A</I>–<I>T</I> isobars can afford two-dimensional isobaric thermal expansivities of insoluble monolayers by differentiation with respect to temperature. The thermal expansivities were evaluated as around 9.0×10<SUP>−4</SUP> K<SUP>−1</SUP> for condensed monolayers and around 30×10<SUP>−4</SUP> K<SUP>−1</SUP> for liquid-expanded monolayers.
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- Studies on the area-temperature isobars of insoluble monolayers at air/water interface. I. Development of a microcomputer-controlle instrument for measuring precise area-temperature isobars.