Relationship between cationic charge, coordination number, and polarizability in oxidic materials

Article Abstract:

An investigation made into the variation of oxide(-II) electronic polarizability, alpha(sub oxide(-II)), for glasses covering a wide range of composition shows that there is an almost linear relationship between alpha(sub oxide(-II)) and glass basicity expressed as optical basicity, lambda. Data for glasses containing the cations indicate that the oxide(-II) atoms of the glass undergo the same degree of polarization regardless of whether these cations exercise a coordination number of four or six.

Metallic oxides, Metal oxides, Polarization (Electricity)

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Electrofluorescence of MEH-PPV and its oligomers: Evidence for field-induced fluorescence quenching of single chains

Article Abstract:

Optical and electronic properties of poly[2- methoxy-5-(2-ethylhexyloxy)-p-phenylenevinylene] (MEH- PPV) and a series of oligomeric model compounds using electroabsorption and electrofluorescence spectroscopy are studied. Evidence of electric-field-induced fluorescence quenching of MEH-PPV in dilute solvent glasses is found.

Plastics Material and Resin Manufacturing, Plastics materials and resins, Vinyl Resins, Usage, Optical properties, Fluorescence spectroscopy, Vinyl polymers

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Multiple mechanical relaxations in ethylcyclohexane above the glass transition temperature

Article Abstract:

The investigation of the mechanical response of ethylcyclohexane at ultrasonic frequencies in a large temperature range from 300 K down to the glass transition region is presented. It exhibited three different mechanical relaxations above the glass transition temperature.

Cyclic crudes and intermediates, Cyclic Crude and Intermediate Manufacturing, Cyclohexane, Thermal properties, Transition temperature, Acoustic properties, Phase transition temperatures

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