Silicon Containing Structures at Interfaces: The Wetting Behavior of Carbohydrate Modified Si Surfactants on Perfluorinated Surfaces and the Modification of Rough Metal Surfaces by Hydrophilic Polysiloxane Networks

Wagner, Roland; Wu, Yuling; Richter, L.; Pfohl, Thomas; Siegel, Stefan; Weißmüller, J.; Reiners, J.; Stelzle, Martin; Fröhlich, R.

doi:10.1002/(sici)1521-4125(199802)21:2<172::aid-ceat172>3.0.co;2-4

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“…Substantial advances in our understanding of this class of surfactants have taken place in recent years including their aqueous phase behavior − and their unique ability to rapidly wet hydrophobic substrates. − Siloxane surfactants are different from conventional hydrocarbon surfactants in being surface active in nonaqueous media and lowering surface tension to about 20 dyn/cm. , A wide variety of structures can readily be prepared, ranging from high molecular weight graft copolymers to the trisiloxane surfactants which are the subject of this paper. Most early papers on siloxane surfactants dealt with applications and their surface propertiessuch things as surface tension, adhesion, lubrication, and skin feel.…”

Section: Introductionmentioning

confidence: 99%

Phase Behavior and Microstructure of Water/Trisiloxane E₆ and E₁₀ Polyoxyethylene Surfactant/Silicone Oil Systems

Washenberger

Scriven

et al. 1999

Langmuir

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The binary and ternary phase behavior of the trisiloxane E6 and E10 polyoxyethylene surfactants with water and three low molecular weight silicone oils has been determined. The silicone oils were the tetra- and pentacyclosiloxanes, D4 and D5, and the short linear tetrasiloxane oil, MD2M. Microstructures were investigated using small-angle X-ray scattering, polarized light microscopy, and cryogenic transmission electron microscopy. Our results illustrate the differences and similarities between the trisiloxane surfactants and conventional hydrocarbon surfactants. Both water/surfactant binary systems form the isotropic spongelike phase, L3, in a narrow temperature band above the lamellar phase region. The L3 phase is found at significantly higher temperatures for the E10 homolog. In the water/M(D‘E6)M system, no two-phase region was detected between the region labeled L3 and the isotropic surfactant-rich region, L2. The different birefringent appearance as one progresses between the L3, the L2, and the lamellar liquid crystal phase, Lα, regions is photographically documented. A large region of lamellar phase is the dominating feature of both the binary water/M(D‘E6)M system and the ternary water/M(D‘E6)M/silicone oil systems. In addition to L3 and Lα, the E10 trisiloxane surfactant, with its larger hydrophilic group, also forms the normal hexagonal liquid crystal phase, H1, in the binary water/M(D‘E10)M system and H1 and the cubic liquid crystal phase, I1, in the ternary systems. The d spacings of the lamellar phase in both the binary and ternary systems are inversely proportional to surfactant concentration and vary only weakly with oil content. Low molecular weight silicone oils shift the phase regions to higher temperature and lead to the formation of highly structured phases such as I1. Higher molecular weight oils shift microemulsion regions to higher temperatures and surfactant concentrations.

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Section: Introductionmentioning

confidence: 99%

Phase Behavior and Microstructure of Water/Trisiloxane E₆ and E₁₀ Polyoxyethylene Surfactant/Silicone Oil Systems

Washenberger

Scriven

et al. 1999

Langmuir

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Silicon Containing Structures at Interfaces: The Wetting Behavior of Carbohydrate Modified Si Surfactants on Perfluorinated Surfaces and the Modification of Rough Metal Surfaces by Hydrophilic Polysiloxane Networks

Cited by 1 publication

References 9 publications

Phase Behavior and Microstructure of Water/Trisiloxane E₆ and E₁₀ Polyoxyethylene Surfactant/Silicone Oil Systems

Phase Behavior and Microstructure of Water/Trisiloxane E₆ and E₁₀ Polyoxyethylene Surfactant/Silicone Oil Systems

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Silicon Containing Structures at Interfaces: The Wetting Behavior of Carbohydrate Modified Si Surfactants on Perfluorinated Surfaces and the Modification of Rough Metal Surfaces by Hydrophilic Polysiloxane Networks

Cited by 1 publication

References 9 publications

Phase Behavior and Microstructure of Water/Trisiloxane E6 and E10 Polyoxyethylene Surfactant/Silicone Oil Systems

Phase Behavior and Microstructure of Water/Trisiloxane E6 and E10 Polyoxyethylene Surfactant/Silicone Oil Systems

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Product

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Phase Behavior and Microstructure of Water/Trisiloxane E₆ and E₁₀ Polyoxyethylene Surfactant/Silicone Oil Systems

Phase Behavior and Microstructure of Water/Trisiloxane E₆ and E₁₀ Polyoxyethylene Surfactant/Silicone Oil Systems