TY - JOUR
T1 - Thermodynamic study of the adsorption of octylsulfinylethanol at the micellar solution/air interface
AU - Motomura, Kinsi
AU - Iwanaga, Shin Ichiro
AU - Uryu, Shozo
AU - Matsukiyo, Hidetsugu
AU - Yamanaka, Michio
AU - Matuura, Ryohei
N1 - Funding Information:
This work ~83 supported by a Grant In Aid for Scientific R-arch 547009 from the Ministry OF Education, Science and Culture.
PY - 1984/3/1
Y1 - 1984/3/1
N2 - The surface tension of the aqueous solution of octylsulfinylethanol (OSE) was measured as a function of temperature at concentrations around the critical micelle concentration (CMC). The derivative of surface tension with respect to the temperature vs concentration curve was found to change abruptly at the CMC like that of dodecylammonium chloride (DAC) reported previously [1]. By comparing the experimental results with the thermodynamic relations derived for the nonionic surfactant, it has been proved in the case of the OSE solution that the micelle formation can be treated thermodynamically as the appearance of a macroscopic bulk phase in the solution. Further, it was found that the entropy change associated with the transfer of surfactant from the micelle to the water/air interface has a positive value for OSE whereas for DAC it had a negative one. This has been accounted for by the difference between OSE and DAC in contributions of the hydrocarbon chain and polar group parts of the surfactant molecule to its mean partial molar entropy.
AB - The surface tension of the aqueous solution of octylsulfinylethanol (OSE) was measured as a function of temperature at concentrations around the critical micelle concentration (CMC). The derivative of surface tension with respect to the temperature vs concentration curve was found to change abruptly at the CMC like that of dodecylammonium chloride (DAC) reported previously [1]. By comparing the experimental results with the thermodynamic relations derived for the nonionic surfactant, it has been proved in the case of the OSE solution that the micelle formation can be treated thermodynamically as the appearance of a macroscopic bulk phase in the solution. Further, it was found that the entropy change associated with the transfer of surfactant from the micelle to the water/air interface has a positive value for OSE whereas for DAC it had a negative one. This has been accounted for by the difference between OSE and DAC in contributions of the hydrocarbon chain and polar group parts of the surfactant molecule to its mean partial molar entropy.
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U2 - 10.1016/0166-6622(84)80139-0
DO - 10.1016/0166-6622(84)80139-0
M3 - Article
AN - SCOPUS:0021390017
VL - 9
SP - 19
EP - 31
JO - Colloids and Surfaces
JF - Colloids and Surfaces
SN - 0166-6622
IS - 1
ER -