Electron tunneling at the semiconductor-insulator-electrolyte interface. Photocurrent studies of the n-InP-alkanethiol-ferrocyanide system

Article Abstract:

Electronic tunneling through self-assembled monolayer films on n-InP semiconductor electrodes has been studied. The research delves on the dependence of the photocurrent on control parameters of the photoelectrochemical cell. The photocurrent is determined by the electron-transfer rate constant, the concentration of the redox couple and the concentration of photogenerated holes at the electrode surface. Results indicate that the photocurrent is a linear function at low concentrations of an equimolar mixture of ferricyanide and ferrocyanide. The reaction becomes zero order in the redox concentration.

Electric properties, Thin films, Tunneling (Physics)

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Thermodynamic analysis of phase coexistence and stability in textured amphiphilic monolayers at the air/water interface

Article Abstract:

The equilibrium behavior of surfactant monolayers in the liquid-expanded/liquid-condensed coexistence region is analyzed. To understand the trends examined in the phase equilibria in an amphiphilic monolayer, a formulation of the monolayer free energy is necessary at a mesoscopic level particularly, the calculation of the exact nature of the free energy of mixing, Gmix, which involves a 2D equation of state for the film. The results are discussed.

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Monolayers and 3D films of cholesteryl derivatives at the air-water interface

Article Abstract:

Cholestrol and its derivatives have been studied at the air-water (A-W) interface. The assembly of molecules in the different phases of the A-W interface for the cholesteryl derivatives with respect to their packaging in the bulk and the onset of smetic liquid - crystalline phases are discussed.

Cholesterol, Chemistry, Physical and theoretical, Physical chemistry, 3-D films, 3-D movies

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