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Contact angle of surfactant solutions on precipitated surfactant surfaces. III. Effects of subsaturated anionic and nonionic surfactants and NaCl
Author(s) -
Luepakdeesakoon Bungon,
Saiwan Chintana,
Scamehorn John F.
Publication year - 2006
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/s11743-006-0381-z
Subject(s) - pulmonary surfactant , chemistry , adsorption , wetting , surface tension , contact angle , critical micelle concentration , chemical engineering , nonionic surfactant , inorganic chemistry , micelle , aqueous solution , organic chemistry , biochemistry , quantum mechanics , engineering , physics
The contact angles of saturated calcium dodecanoate (CaC 12 ) solutions containing a second subsaturated surfactant on a precipitated CaC 12 surface were measured by using the drop shape analysis technique. The subsaturated surfactants used were anionic sodium dodecylsulfate (NaDS), anionic sodium octanoate (NaC 8 ), and nonionic nonylphenol polyethoxylate (NPE). Comparing at the critical micelle concentration (CMC) for each surfactant, NaC 8 was the best wetting agent, followed by NaDS, with NPE as the poorest wetter (contact angles of 32 0 , 42 0 , and 62 0 , respectively). Surface tension at the CMC increased in the order NaC 8