Effect of the hydrophilicity of aromatic counterions on the structure of ionic micelles

Article Abstract:

Small-angle neutron scattering experiments are done on aqueous micellar solutions of cationic surfactant cetyltrimethylammonium bromide (CTABr) in the presence of different aromatic salts. It is found that both the amount of hydrophilicity and the position of the hydrophilic groups in the aromatic counterions play an important role in deciding the charge neutralization by these counterions on the micellar surface.

Hydrophobic effect, Suspensions (Chemistry)

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pH-Dependent phase behavior of carbonate-based gemini surfactants: The effects of carbohydrate stereochemistry, head group hydrophilicity, and nature of the spacer

Article Abstract:

The effects of the size of the head group, carbohydrate stereochemistry and the nature of the spacer are investigated for a series of carbohydrate-based gemini surfactants displaying pH-dependent phase behavior. The results have shown that hydrophobic hydration of the vesicular surface is not a prerequisite for the specific ordering of water molecules, which is required for hydroxide-ion binding.

Pharmaceutical Preparation Manufacturing, Pharmaceutical preparations, Surface Active Agents, Carbohydrates, Stereochemistry, Report

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Chain-length anomaly in the two-dimensional ordering of the cationic surfactants CnTAB at the graphite/water interface, revealed by advanced calorimetric methods

Article Abstract:

The monolayer formation of even-numbered alkyltri-methylammonium bromides CnTAB (n = 6-16) at the graphite/water interface is studied by applying frontal-flow and pulsed-flow calorimetric methods. It is concluded that surface characterization of heterogeneous catalysts by the chemisorption of suitably elected probe molecules from inert solvents is promising.

Chemistry, Physical and theoretical, Physical chemistry, Calorimetry

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