Neutron reflection study of phenol adsorbed at the surface of its aqueous solutions: an unusual adsorbed layer

Article Abstract:

Experiments were performed to investigate the adsorption of phenols on air and liquid interfaces. In particular, neutron reflection and second harmonic generation (SHG) techniques were utilized to measure phenol adsorption at the surface of aqueous solutions. The surface coverage, scattering length and densities of phenol were determined. No direct conflict was observed from the results of the neutron reflection and SHG tests. However, inconsistencies were found in the computer simulation and neutron reflection tests related to the distribution of phenol molecules on the surface normal.

Measurement, Phenols, Phenols (Class of compounds), Surface tension

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Neutron reflectivity of an adsorbed water-soluble block copolymer: a surface transition to micelle-like aggregates at the air/water interface

Article Abstract:

The structure of equilibrium layers of the block polyelectrolyte poly(2-(dimethylamino)ethyl methacrylate-block-methyl methacrylate) adsorbed at the air/water interface was investigated using neutron reflectivity calculations. The adsorption isotherm was derived from the measurements, which revealed a surface phase transition from one layer to another. The concentration of polymer at which the phase transition takes place is close to that at which micellar aggregation in the bulk solution also occurs.

Micelles, Polyelectrolytes

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Neutron reflectivity of an adsorbed water-soluble block copolymer at the air/water interface: the effects of pH and ionic strength

Article Abstract:

Research was conducted to examine the effects of pH and added electrolyte on the structure of layers of poly(2-(dimethylamino)-ethyl methacrylate-block-methyl methacrylate)copolymer (poly(DMAEMA-b-MMA)) adsorbed at the air/water interface. Results demonstrate that the micellar structure is promoted by any alterations in the solution that enhance the surface coverage but is restricted by an increase in the fractional charge on the polyelectrolyte part of the copolymer.

Neutrons, Ions, Electrolytes, Hydrogen-ion concentration

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