Effect of the chain length on the inter-and intramolecular dynamics of liquid oligo(ethylene glycol)s

Article Abstract:

A study is conducted to investigate the separation of inter and intermolecular effects on the dielectric relaxation behavior of ethylene glycol (sub n) and poly ethylene glycol compounds at 25 degree Celsius. The result reveals that this approach allows separation of end group effects connected with the relaxation of the hydrogen bond network from intramolecular dipole relaxation processes caused by the reorientation of chain segments.

Science & research, Research, Molecular dynamics, Hydrogen bonding, Hydrogen bonds, Polyethylene glycol

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Dielectric relaxation of cationic surfactants in aqueous solution. 1. Solvent relaxation

Article Abstract:

Complex dielectric permittivity spectra in the frequency range of 0.09 less than equal to upsilon/ GHz less than equal to 89 were recorded for certain aqueous solutions at room temperature and specific concentrations. The analysis of the relaxation processes attributed to water reveals that the micelles formed by tetraalkylammonium surfactants are considerably hydrated by two different species of ground water.

Chemical properties

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Dielectric relaxation of cationic surfactants in aqueous solution. 2. Solute relaxation

Article Abstract:

The complex dielectric permittivity spectra of octy-, dodecyl-, and hexadecyltrimethylammonium bromide and of dodecyltrimethylammonium chloride are studied. The study reveals two low-frequency relaxation processes centered around 80 and 250 MHz.

Structure

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