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- W2068946959 abstract "The surface pressure—area (π-A) curves for monolayers of three types of cation-anion double long-chain salts (alkyltrimethylammonium alkanesulfonates, alkyllamonium alkanesulfonates, and alkyllamonium alkanoates) on the concentrated electrolyte solution (i.e., 4.4 M NaCl) were measured at various temperatures by the Langmuir method. Of three types of double long-chain salts, the π-A curves for some of these salts have two transition points. And a marked temperature dependence of the first transition pressure was observed which leads to a large apparent molar entropy change on the phase transition, while a slight temperature dependence was observed for the second transition pressure which leads to a small entropy change on the transition. The apparent molar entropy change on the second transition is lowered by one order in the magnitude compared with the entropy change on the first transition. Judging from the entropy change on the transition, the first transition was assigned to the transition from the expanded state (E phase) to the condensed state (C-I phase) and the second one to the transition from the C-I phase to another condensed state (C-II phase). There exists a triple point on the phase diagram at which three phases (i.e., E, C-I, and C-II) coexist in equilibrium. In this paper, the other transition from the E phase to the C-II phase was observed at the temperature above the triple point. From the data of the apparent molar entropy change, limiting area, and compressibility, the orientation of double long-chain salts in the condensed film was assumed as follows. In the most compressed state of the C-II phase, the double long-chains are probably aligned perpendicular to the water surface. For the C-I phase, in which the limiting area was considerably larger than in the C-II phase, we can imagine the condensed monolayer with the elongated distance between the ionic head groups because of the incorporation of Na+ and Cl− ions into the two-dimensional ionic crystal structure with the long chains aligned on the tilt." @default.
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- W2068946959 date "1983-11-01" @default.
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- W2068946959 title "Monolayers of double long-chain salts on the concentrated sodium chloride solution" @default.
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