The Surface Activity of Silicones: A Short Review

Owen, Michael J.

doi:10.1021/i360073a023

Cited by 134 publications

(96 citation statements)

References 13 publications

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“…10 The Si-O bond is 50% ionic, and polar interactions between these bonds and water provide the driving force for this orientation. 15 Overall, surfactants A (Silwet L 7600) and B (Silwet L 7607) were the most successful at improving wettability and, at the 5 and 10% levels, they produced formulations with comparable wettability to Molloplast-B. As stated earlier, the surfactants used in this study were nonhydrolyzable copolymers of a silicone and an alkylene oxide, where the PE group may be a long chain moiety giving a comb-like structure.…”

Section: Discussionsupporting

confidence: 53%

Improved wettability of an experimental silicone rubber denture soft lining material

Waters

Jagger

1999

J. Biomed. Mater. Res.

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The purpose of this study was to improve the wettability of an experimental silicone rubber soft lining material (Sildent) to increase patient comfort. Sildent was modified by the addition of polyalkylene oxide poly(dimethylsiloxane) surfactants. The various surfactants were added directly to the polymeric matrix in the quantities 5, 10, 20% w/w. The surfactants were also added to a one part silicone sealant, which was then painted onto the surface of already cured Sildent. Contact angle measurements were made on samples using a dynamic contact angle analyzer. Results showed that incorporation of surfactants A (Silwet L7600) and B (Silwet L7607) effectively improved the wettability of Sildent. This improvement was still evident after 6 months storage in distilled water at 37 degrees C suggesting retention of the surfactants matrix via physio-chemical bonding. Formulations with surfactants added directly to the matrix showed unacceptable water absorption after 2 months in distilled water. Samples with surfactant charged sealant painted on the surface showed a lower water absorption. In conclusion, Sildent formulations modified with polyalkylene silicone surfactants showed improved wettability compared to unmodified Sildent. Further work is needed to reduce water uptake and determine the effect on key mechanical properties.

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Section: Discussionsupporting

confidence: 53%

Improved wettability of an experimental silicone rubber denture soft lining material

Waters

Jagger

1999

J. Biomed. Mater. Res.

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“…Considering that the measured adherence between a PDMS elastomer and a PDMS pseudo-brush by peel or Johnson-Kendall-Rogers (JKR) tests [31] decreases dramatically with increasing surface chain density [21], this is a benefit. In fact, at high chain density the work of adherence, G, ranges from the mere reversible work of adhesion (here, cohesion) of PDMS, W, which is (43 ± 3) mJ.m 2 from careful surface tension component measurements [27][28][29][30], to 3.5 times W, depending on the experimental conditions. The upper limit represents at the most a sixth of the adherence measured with less dense, optimized-for-maximum adherence pseudo-brushes.…”

Section: Pdms Monolayer Thicknessmentioning

confidence: 99%

Femtosecond laser micromachining of fused silica molds

Madani-Grasset

Bellouard

2010

Opt. Express

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The use of low-energy femtosecond laser beam combined with chemical etching has been proven to be an efficient method to fabricate three-dimensional structures in fused silica. For high-volume application, this technology -like other serial processes -suffers from a moderate production rate. Here, we show that femtosecond laser can also be employed to fabricate silica molds and other patterned surfaces, including surfaces with high aspect ratio features (> 10). Through appropriate tailoring of silica"s surface property and subsequent creation of, for instance, simple elastomeric molding, new opportunities for the indirect 3D, multi-scale spatial characterization of deep laser-fabricated microstructures come along. We demonstrate that those moldings are characterized by a high fidelity (down to the nanometer scale) to the silica mold. These results further advance the applicability of femtosecond laser processing to glass.

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“…The accumulation of bulkier ethyl groups reduces to a certain extent the chain flexibility. The additional presence of higher-energy -CH 2 - groups 29 (compared with -CH 3 groups) also provides a contribution to the increased surface tension.…”

Section: Wetting Behaviour Of Siloxanyl-modified Carbohydratesmentioning

confidence: 99%

“…29 But they cannot suppress a certain depth influence of the oxygen atoms. If one considers both (1) the differences in the specific area per molecule [(with similar packing at both interfaces, 33 at the liquid/vapour interface 40 Å 2 (22) 26 and 50 Å 2 (3) 26,27 ] and (2) in (22) the significantly greater distance to the solid surface of the second oxygen atom (Fig.…”

Section: Solid/liquid Interfacial Tension (␥ Sl )mentioning

confidence: 99%