Infrared spectroscopy study of aldehydes adsorbed on Rh-Sn bimetallic systems: selective activation of aldehydes by tin

Article Abstract:

Infrared spectra of propionaldehyde was investigated over silica-supported Rh-Sn bimetallic catalysts. Two absorption bands of the carbonyl group were seen at 1670 and 1720/cm and the aldehyde hydrogen (-CH=O) was also seen at 2748 and 2848/cm over the Sn/Rh/SiO2 catalysts on which propionaldehyde was preadsorbed. The adsorbed species observed at 1670/cm in the infrared spectra was found to be one of the most effective surface adsorption states in the selective hydrogenation reaction of carbonyl groups in unsaturated compounds.

Analysis, Tin, Aldehydes, Rhodium

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Observation of G-LE and LE-LC phase transitions of adsorbed 1-dodecanol monolayer from dynamic surface-tension profiles

Article Abstract:

Two phase transitions, G-LE and LE-LC, of the adsorbed monolayer of the soluble surfactant 1-dodecanol at the air-water interface were observed from the dynamic surface tension measurement by using a pendant bubble tensiometer. Two constant surface-tension (gamma) regions were detected in the dynamic surface-tension gamma(t) profiles of different surfactant concentrations at 20 degrees Celsius.

Usage, Surface tension, Tensiometers

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Effects of surface packing density of interfacial adsorbed monoclonal antibody on the binding of hormonal antigen human chorionic gonadotrophin

Article Abstract:

The interfacial adsorption of a mouse monoclonal antibody at the hydrophilic siliconoxide/water interface was studied by spectroscopic ellipsometry and neutron reflection. The neutron reflection revealed that the formation of a 40 Angstrom units uniform layer from the adsorbed antibody, indicating a flat-on orientation.

Monoclonal antibodies, Chorionic gonadotropin, Chorionic gonadotropins, Antigens, Structure, Chemical properties

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