The effects of fatty acid (
m=816) and alcohol (
n=818) portions in sodium 2-sulfonato-fatty acid higher alkyl esters [C
mH
2m+1CH (SO
3Na) COOC
nH
2n+1] on monolayers were investigated. Monolayers were converted readily to condensed monolayers with an increase in total hydrophobic chain length and/or with a decrease in difference between two hydrophobic chain lengths. The transition pressure at which an expanded monolayer changed to a condensed monolayer increased with temperatures. The temperature at which the expanded monolayer began to form, i.e., the melting point of the monolayer (
Tm), was lower than the melting point (
Tc) of the hydrophobic chain length in the bilayer.
Tm increased with increasing total hydrophobic chain lengths and/or with decreasing chain length difference.
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