Observation of a liquid-gas phase transition in monolayers of alkytrimethylammonium alkyl sulfates adsorbed at the air/water interface

Article Abstract:

The equilibrium adsorption layers of symmetric chain alkyltrimethylammonium alkyl sulfates were investigated at the air/water interface by sum-frequency vibrational spectroscopy in the function of the bulk surfactant concentration. The occurrence of the phase transition is indicated by the breakpoint in the equilibrium surface tension versus concentration curve and by the sudden increase of SFG intensities at the same bulk surfactant concentration.

Monomolecular films, Sulfates, Vibrational spectra

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Synthesis of porous organosilicates in the presence of alkytrimethylammonium chlorides: Effect of the alkyl chain length

Article Abstract:

A series of organosilicates are prepared using 1,2-bis(trimethoxysilyl)ethane (BTME) as silica precursor and alkytrimethylammonium chloride (CnTMACl) surfactants with different chain lengths as supramolecular templating materials. (super 13)C and (super 29)Si NMR data showed that after surfactant extraction, all samples consisted of pure organosilicate.

Chemistry, Physical and theoretical, Physical chemistry, Methyl groups, Methyl group

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Enhancement of third-order optical nonlinearities in 3-dimensional films of dielectric shell capped Au composite nanoparticles

Article Abstract:

The composite nanoparticles of Au-core capped by CdS shells of different thickness were prepared and assembled into densely packed 3-dimensional films layer-by-layer self assembly technique. Additionally, the nonlinearity was optimized by determination of the values of the dielectric constant and thickness of the different shell.

All Other Basic Inorganic Chemical Manufacturing, Industrial inorganic chemicals, not elsewhere classified, Gold Compounds, Cadmium Compounds, Electric properties, Optical properties, Dielectrics, Dielectric materials, Structure

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