Effect of processing conditions on the formation of aggregates and phase domains in monolayers of the hemicyanine dye, 4-(4-(dihexadecylamino)styryl)-N-methylpyridinium iodide

Article Abstract:

Epifluorescence microscopy and tapping mode AFM measurements is used to study the morphology of Langmuir-Blodgett monolayers of the hemicyanine dye, 4-(4-dihexadecylamino)styryl)-N-methylpyridinium iodide under varying conditions spreading, concentration, compression, speed, aging subphase composition and deposition pressure. Results showed that morphology is very sensitive to film preparation conditions and is also relatively insensitive to deposition pressure for a given film preparation protocol.

Fluorescence microscopy, Thin films, Multilayered, Multilayered thin films

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Boundary lubrication and surface mobility of mixed akylsilane self-assembled monolayers

Article Abstract:

A combination of experiment and theory is used to study the boundary lubrication characteristics of mixed self-assembled monolayers (SAMs) formed by tethering alkylsilanes with different chain lengths to planar substrates. Systematic increase in surface disorder is indicated as the molecular weight of molecules is lowered in one-component systems and, in mixed SAMs, as the difference in molecular weight of the two-component sis varied and as the ratio of the components approaches 1/1.

Observations, Infrared spectroscopy

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Spectroscopic characterization of 4'-substituted aromatic self-assembled monolayers on GaAs(100) surface

Article Abstract:

High-resolution X-ray photoelectron spectroscopy and near-edge X-ray adsorption fine structure spectroscopy were used to characterize GaAs(100) engineered by self-assembled monolayers (SAMs) of 4'-substituted aromatic molecules. The covalent coupling of 1,1'-bipenyl-4-thiol derivatives enabled both the protection of GaAs surface from degradation and control over surface free energy of the engineered GaAs.

Gallium arsenide

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