Detail of "5168-89-8"

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Surface activity of selected non-ionic surfactants; their chemical structure and possible application

Surface activity of selected non-ionic surfactants; their chemical structure and possible application. Pawelek, Janusz; Polanska, Maria (Inst. Katal. Fizykochem. Powierzchni, PAN, Krakow, Pol.). Univ. Iagellon.There are some reagents with their cas registry numbers 5168-89-8 and 39840-09-0 are used in this study. Acta Chim., 34, 219-26 (Polish) 1991. CODEN: UIACEG. DOCUMENT TYPE: Journal CA Section: 66 (Surface Chemistry and Colloids) Section cross-reference(s): 46 The surface activity, solubilization, and wettability characteristics of aq. solns. of selected nonionic surfactants were detd. The effect of the ratio of sizes of hydrophobic to hydrophilic groups in the surfactant mols. on surface activity as well as the possible application of these surfactants were studied. Crit. micellization concn. and wettability increase while solubilization decreases with increasing no. of ethylene oxide groups in the surfactant mol. These surfactants were divided into 3 groups based on the energies of surface structures and solubilization characteristics. .

Heat Capacity Changes Accompanying Micelle Formation upon Burial of Hydrophobic Tail of Nonionic Surfactants

Heat Capacity Changes Accompanying Micelle Formation upon Burial of Hydrophobic Tail of Nonionic Surfactants. Chen, Li-Jen; Sheu, Yih-Heh; Li, Pei-Juian (Department of Chemical Engineering, National Taiwan University, Taipei, Taiwan 10617, Peop. Rep. China). Journal of Physical Chemistry B, 108(50), 19096-19098 (English) 2004 American Chemical Society. CODEN: JPCBFK. ISSN: 1520-6106. 5168-89-8 and 19327-40-3 are cas registry numbers. These chemicals are also mentioned in this article. DOCUMENT TYPE: Journal CA Section: 46 (Surface Active Agents and Detergents) The heat of micellization DHm for five nonionic surfactants (C10E5, C10E6, C10E7, C10E8, C8E5) was measured as a function of temp. by using an isothermal titrn. calorimeter. The abbreviation CiEj stands for the nonionic surfactant CH3(CH2)i-1(OCH2CH2)jOH. The heat capacity change upon micellization DCp was detd. from DHm's. It is found that DCp is const. for four C10Ej's. That is DCp is independent of the chain length of hydrophilic headgroups. Furthermore, DCp is directly proportional to the removal of water accessible nonpolar surface area DAnp. The ratio DCp/DAnp is equal to -1.28±0.06 J mol-1 K-1 ?-2 for C10Ej's and -1.34±0.06 J mol-1 K-1 ?-2 for C8E5, consistent with that obsd. upon protein folding (-1.34±0.33 J mol-1 K-1 ?-2) of Spolar et al. (Biochem. 1992, 31, 3947.). .