Thermodynamic behavior and collapse kinetics of mixed DPPC/n-hexadecanol monolayers at the air/water interface

Kai Bin Chen, Chien Hsiang Chang, Yu Min Yang, Jer Ru Maa

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11 Citations (Scopus)

Abstract

The thermodynamic behavior and collapse kinetics of mixed DPPC/n-hexadecanol monolayers at the air/water interface were studied. Surface pressure-area isotherms were obtained for mixed DPPC/n-hexadecanol monolayers at 15°C, 25°C , and 37°C by using a computer-controlled film balance. The analysis indicated that, at all surface pressures and compositions, the areas of monolayers exhibited significant negative deviations from the ideal values. Excess free energy changes of mixing had been calculated and the most stable state of the mixed monolayer with xDPPC = 0.5 was found. The collapse kinetics of the mixed monolayers in the temperature range of 15-37°C was investigated by the relaxation measurements of the surface pressure at the collapse point as a function of time. It was shown that the collapse process which occurred in two stages can be represented by a nucleation and growth mechanism. The first stage is described by the Prout-Tompkins law and the second stage is described by a second order kinetic law.

Original languageEnglish
Pages (from-to)x7-464
JournalJournal of the Chinese Institute of Chemical Engineers
Volume27
Issue number6
Publication statusPublished - 1996 Dec 1

All Science Journal Classification (ASJC) codes

  • Chemistry(all)
  • Chemical Engineering(all)

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