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Influence of Temperature on the Surface Tension of Triton Surfactant Solutions
Author(s) -
Nguyen Trung B.,
Phan Chi M.
Publication year - 2019
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 - 10.1002/jsde.12228
Subject(s) - surface tension , chemistry , pulmonary surfactant , maximum bubble pressure method , ethylene oxide , atmospheric temperature range , sodium , thermodynamics , chemical engineering , organic chemistry , polymer , biochemistry , physics , engineering , copolymer
The surface tension of different Triton surfactants (X‐100, X‐405, and X‐705) with or without adding sodium chloride was measured in the temperature range between 20 and 40°C using the maximum bubble pressure method. Rising temperature reduced the surface tension of Triton surfactants via disrupting the H‐bonds between the ethylene oxide (EO) group and water. Increasing the number of the EO groups created the steeper thermal gradient of the surface tension. The data indicated that EO‐water bonds are easier to be broken by rising temperature than the water–water H‐bonds, with an entropy change of −0.535 J deg −1 per mole of EO. The presence of NaCl decreased the surface tension for all systems. However, NaCl produced a synergistic effect with surfactants on the surface tension.