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Effect of Narrow Oxirane Adduct Distribution on the Adsorption of Disodium Alcohol Ethoxylates Sulfosuccinate at Air–Aqueous Solution Interface
Author(s) -
Wen Pengpeng,
Gao Yuyang,
Sun Yongqiang
Publication year - 2017
Publication title -
journal of surfactants and detergents
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.349
H-Index - 48
eISSN - 1558-9293
pISSN - 1097-3958
DOI - 10.1007/s11743-017-1967-3
Subject(s) - chemistry , adsorption , surface tension , aqueous solution , steric effects , electrolyte , wilhelmy plate , adduct , alcohol , analytical chemistry (journal) , inorganic chemistry , gibbs isotherm , chromatography , thermodynamics , stereochemistry , organic chemistry , physics , electrode
Adsorption behaviors at the air–water interface were presented for disodium alcohol ethoxylate sulfosuccinates (AESS) with narrow and broad oxirane adduct distribution. The CMC and equilibrium surface tension γ eq of broad‐range distributed (BRD) and narrow‐range distributed (NRD) AESS 2 (with average degrees of ethoxylation of 2) were measured by the Wilhelmy plate method, while the adsorption and thermodynamic parameters were calculated. The effect of temperature and inorganic electrolyte on adsorption behaviors of these two surfactants was also investigated. The results show that NRD AESS 2 displays a lower CMC and higher γ eq compared with BRD AESS 2 . At the same time, the maximum surface excess concentration Γ max of NRD AESS 2 was lower than that of BRD AESS 2 because of its larger steric hindrance, leading to the different adsorption and thermodynamic parameters. The adsorption of NRD AESS 2 and BRD AESS 2 was weakened with increasing temperature and enhanced in the presence of inorganic electrolyte.