Document Detail


Adsorption behaviors of cationic surfactants and wettability in polytetrafluoroethylene-solution-air systems.
MedLine Citation:
PMID:  23148857     Owner:  NLM     Status:  Publisher    
Abstract/OtherAbstract:
Measurements of the advancing contact angle ( ) and adsorption properties were carried out for aqueous solutions of four cationic surfactants, hexadecanol glycidyl ether ammonium chloride (C16PC), guerbet alcohol hexadecyl glycidyl ether ammonium chloride (C16GPC), hexadecanol polyoxyethylene(3) glycidyl ether ammonium chloride(C16(EO)3PC) and guerbet alcohol hexadecyl polyoxyethylene(3) glycidyl ether ammonium chloride (C16G(EO)3PC), on the polytetrafluoroethylene (PTFE) surface using the sessile drop analysis. The obtained results indicate that the contact angle decreases to a minimum with the increasing concentration for all cationic surfactants. Surfactants with branched-chain show lower values. Moreover, an increase of adhensional tension on PTFE-water interface has been observed for the four cationic surfactants, and the branched ones have larger increases of adhensional tension. It is very interesting that the sharp decrease of appears mainly after critical micelle concentration (cmc) for C16GPC, C16(EO)3PC and C16G(EO)3PC, which is quite different from traditional cationic surfactants reported in the literature. Especially for C16G(EO)3PC , there are two saturated adsorption stages on PTFE surface after cmc (which means the saturated adsorption film at air-solution interface has been formed). In the first saturated stage, the C16G(EO)3PC molecules are oriented parallel to the PTFE surface with saturated monolayer formed through hydrophobic interaction and hydrogen bond. In the second saturated stage, the hemimicelle has been formed on the PTFE surface, which can be supported by the QCM-D and SPR measurements.
Authors:
Dan-Dan Liu; Zhi-Cheng Xu; Lei Zhang; Lan Luo; Lu Zhang; Tianxin Wei; Sui Zhao
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Publication Detail:
Type:  JOURNAL ARTICLE     Date:  2012-11-14
Journal Detail:
Title:  Langmuir : the ACS journal of surfaces and colloids     Volume:  -     ISSN:  1520-5827     ISO Abbreviation:  Langmuir     Publication Date:  2012 Nov 
Date Detail:
Created Date:  2012-11-14     Completed Date:  -     Revised Date:  -    
Medline Journal Info:
Nlm Unique ID:  9882736     Medline TA:  Langmuir     Country:  -    
Other Details:
Languages:  ENG     Pagination:  -     Citation Subset:  -    
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