Molecular dynamics in binary organic glass formers

Article Abstract:

A study on the dynamics of simple organic glass formers applied nuclear magnetic resonance and dielectric spectroscopy to investigate the dynamics of binary low-molecular-weight glass formers. The experiment focused primarily on the relaxation behavior of the respectively smaller components of a binary mixture above and below glass transition temperature. It shows that many effects found in polymer-plasticizer systems are already observed in low-molecular-weight mixtures.

Case studies, Liquid metals

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Molecular motion in the two amorphous phases of triphenyl phosphite

Article Abstract:

Dielectric relaxation and two-dimensional nuclear magnetic resonance spectroscopy were used in studying the molecular orientation in the two amorphous phases of triphenyl phosphite. These states are the supercooled liquid phase (aI) and the second amorphous phase (aII). It was observed that aI displays the relaxational patterns of supercooled liquids while aII shows massive dielectric loss and a significant nonexponential reorientational correlation function.

Analysis, Molecular rotation

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Type A versus type B glass formers: NMR relaxation in bulk and confining geometry

Article Abstract:

(Super 2)H NMR spin-lattice relaxation times T1 and spectra of two fragile molecular glass forming liquids, deuterated 0-terphenyl-d14 (OTP) and toulene-d5, confined in a nanoporous SBA-15 type matrix with a pore diameter of 7.1-nm size is reported. The results are compared with bulk data of several glass formers.

Science & research, Usage, Nuclear magnetic resonance, Matrix mechanics

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