title: Effect of Hydrophobic Chain Structure on Phase Transition and Domain Formation of Hybrid Alcohol Films Adsorbed at the Hexane/Water Interface.
abstract: The phase transition and domain formation of the adsorbed film of two kinds of hybrid alcohols (CF3(CF2)m-1(CH2)nOH, FmHnOH), 2-perfluorooctylethanol (F8H2OH) and 2-perfluorohexylhexanol (F6H6OH), as a mixture at the hexane/water interface was investigated by interfacial tensiometry and X-ray reflection. The interfacial tension γ versus total molality m curve of pure F8H2OH has a break point at high concentration, and thus, the mean area per molecule A changes discontinuously at high interfacial pressure π, corresponding to the phase transition between expanded and condensed films. The Fresnel divided reflectivity R/RF versus Qz plots in the expanded state was well-fitted by the domain model for incoherent interference to determine the interfacial coverage, which is the fraction of the interface covered by the condensed phase. This indicates that the expanded film is heterogeneous and consists of a condensed F8H2OH domain, the size of which is larger than the X-ray coherence length (∼5 μm). In the mixed system, the discontinuous change in A at the phase transition point becomes small with increasing the bulk composition of F6H6OH X2 in the mixture, and eventually the A value changes continuously; i.e, the phase transition becomes obscure in X2 ≥ 0.6. This behavior was linked to an increase in interfacial coverage with X2. Furthermore, the R/RF versus Qz plot was fitted by the domain model for coherent interference, suggesting that the size of the domain is smaller than 5 μm. These results are probably due to the reduction of domain line tension by preferential adsorption of F6H6OH at the F8H2OH domain boundary.
authors: Department of Chemistry, Faculty of Sciences, Kyushu University , Fukuoka 812-8581, Japan.
authors: Kenta
authors: K
authors: Mitani
authors: Faculty of Arts and Science, Kyushu University , 744 Motooka, Nishi-ku, Fukuoka 819-0395, Japan.
authors: Yosuke
authors: Y
authors: Imai
authors: Japan Synchrotron Radiation Research Institute , Hyogo 678-5198, Japan.
authors: Toshiaki
authors: T
authors: Ina
authors: Japan Synchrotron Radiation Research Institute , Hyogo 678-5198, Japan.
authors: Kiyofumi
authors: K
authors: Nitta
authors: Japan Synchrotron Radiation Research Institute , Hyogo 678-5198, Japan.
authors: Hajime
authors: H
authors: Tanida
authors: Japan Synchrotron Radiation Research Institute , Hyogo 678-5198, Japan.
authors: Tomoya
authors: T
authors: Uruga
authors: Department of Chemistry, Faculty of Sciences, Kyushu University , Fukuoka 812-8581, Japan.
authors: Hiroki
authors: H
authors: Matsubara
authors: Department of Chemistry, Faculty of Sciences, Kyushu University , Fukuoka 812-8581, Japan.
authors: Makoto
authors: M
authors: Aratono
authors: Department of Chemistry, Faculty of Sciences, Kyushu University , Fukuoka 812-8581, Japan.|Faculty of Arts and Science, Kyushu University , 744 Motooka, Nishi-ku, Fukuoka 819-0395, Japan.
authors: Takanori
authors: T
authors: Takiue