Direct evidence of the enthalpy release being accompanied by first-order phase transitions of monolayers at the air/water interface by compression
✍ Scribed by Teijo Kato; Hideyuki Akiyama; Takuya Tanaka
- Publisher
- Elsevier Science
- Year
- 1991
- Tongue
- English
- Weight
- 530 KB
- Volume
- 184
- Category
- Article
- ISSN
- 0009-2614
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✦ Synopsis
Insoluble monolayers at the air/water Interface change their phases with isothermal compression. Previously, however, it has been difficult to detect the temperature change of the monolagers by the enthalpy release in their first-order phase transition regions because the amount of film materials on the water surface was much too small. We constructed a new instrument, which controlled the temperatures of the water surface and the air above the water within O.O2"C, to detect this temperature change. Direct evidence is given for the enthalpy release which is accompanied by the first-order phase transitions caused by the compression of monolayers of arachidic acid and stearic acid at the air/water interface, and the possibility is discussed that the so-called "solid films" of these monolayers do not correspond to the two-dimensional solids but to the first-order phase transition regions from two-dimensional liquids to solids.