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Flow microcalorimetry of adsorption of anionic alkyl surfactants at the solid/liquid interface
Author(s) -
Tan XinYi,
Yan HaiKe,
Hu RiHeng,
Loren Hepler G.
Publication year - 1992
Publication title -
chinese journal of chemistry
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.28
H-Index - 41
eISSN - 1614-7065
pISSN - 1001-604X
DOI - 10.1002/cjoc.19920100302
Subject(s) - chemistry , isothermal microcalorimetry , alkyl , adsorption , aqueous solution , micelle , carboxylate , critical micelle concentration , monomer , phase (matter) , inorganic chemistry , organic chemistry , thermodynamics , polymer , enthalpy , physics
Flow microcalorimetry was used to study the adsoption of anionic alkyl surfactants from aqueous solutions onto silica. It is found that for alkyl sulfate systems the strength of adsorption interaction increases with increases of the alkyl chain length and decreases as temperature rises. The adsorption depends only on monomer concentration of the solution even above the critical micelle concentration ( cmc ). The assumption is made that the adsorption involves only a transfer of monomers from bulk to surface phase. A different adsorption mechanism is operative for the alkyl carboxylate.