pH-responsive diblock copolymer micelles at the silica/aqueous solution interface: Adsorption kinetics and equilibrium studies

Article Abstract:

The adsorption behavior of two poly(2-(dimethylamino)ethyl methacrylate)-block-poly(2-diethylamino)ethyl methacrylate) (PDMA-PDEA) diblock copolymers at the silica/aqueous solution interface is investigated as a function of solution pH, block ratio, and copolymer concentration. The complementary measurements by using optical reflectometry (OR) are carried out in order to determine the actual adsorbed amount of copolymer and hence allow estimation of the degrees of hydration of the adsorbed copolymer layers from the combined data.

Analysis, Electric properties, Optical properties, Block copolymers, Aqueous solution reactions

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Stable ordered mesoporous silica materials templated by high-temperature stable surfactant micelle in alkaline media

Article Abstract:

Using cationic (1,3-dimethyl-2-imidazolidin-2-ylidene) hexadecylmethyl-ammonium bromide (DIHAB) as a template, an ordered hexagonal mesoporous silica material (JLU-30) is successfully synthesized in alkaline media at high-temperature (>160 C). The heteroatoms such as Al and Ti species are easily introduced into the mesoporous walls of JLU-30 by using a simple mixture of tetraethyl orthosilicate (TEOS) with aluminum or titanium source in the initial reaction gel.

Surface active agents, Surface Active Agent Manufacturing, Chemical synthesis

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Slow organization of cationic surfactant adsorbed to silica from solutions far below the CMC

Article Abstract:

The aggregation of hexadecyltrimethylammonium bromide, CTAB, on silica at pH 9.6 (plus minus) 0.4 is shown. The lower critical surface aggregation concentration, CSAC, results from the increased surface charge of the silica.

Solution (Chemistry), Solutions (Chemistry), Ammonium compounds, Ammonium chloride, Ammonium paratungstate, Ammonium salts

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