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Kalorimetrische Untersuchungen des Wassereinflusses auf den Lösungsvorgang von Aerosol OT in apolaren Lösungsmitteln
Author(s) -
Christen Heinz,
Eicke HansFriedrich,
Hammerich Holger,
Strahm Ulrich
Publication year - 1976
Publication title -
helvetica chimica acta
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.74
H-Index - 82
eISSN - 1522-2675
pISSN - 0018-019X
DOI - 10.1002/hlca.19760590432
Subject(s) - chemistry , pulmonary surfactant , endothermic process , solvent , aerosol , mesophase , nonionic surfactant , organic chemistry , adsorption , biochemistry , phase (matter)
Calorimetric Investigations of the Effect of Water on the Solution Process of Aerosol OT in Apolar Media. Heats of solution of Aerosol OT in apolar solvents are influenced considerably by already small amounts of water. Calorimetric investigations of the solution process with differently dried surfactant and solvent samples showed the predominating effect on the heats of hydration with regard to the ionic and polar groups of the surfactant. Only if the hydration is finished prior to the process of solution, the latter is endothermic. An estimation of the various enthalpic contributions demonstrates that the destruction of the coherence of the built‐in water within the surfactant is decisive in the latter case. Two models corresponding to definite structures of the liquid crystalline mesophase of the surfactant show very satisfactory agreement with the experimental Δ H ‐values.