Diffusivity and nuclear spin relaxation measurements at high pressure in methanol

R. F. Marzke, D. P. Raffaelle, George Wolf, Jeffery Yarger

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Abstract

Diffusivity D and nuclear spin relaxation times T 1 and T 2 have been measured by NMR to 4.0 GPa in methanol, using a diamond anvil cell probe. In pure MeOH, D -1 and T 2 show essentially identical activation volumes. However, these are approximately 18% larger than the activation volume of viscosity. By relating these observations to an average molecular correlation time a pressure-dependent infinite-frequency shear modulus G can be inferred, using two independent approaches. The relation between diffusivity and viscosity shows increasing departure from Stokes-Einstein behavior with increasing pressure, if a constant hydrodynamic radius is assumed. This departure is attributed to the pressure dependence of G , and can be described empirically by a simple modification of the Stokes-Einstein relation.

Original languageEnglish (US)
Title of host publicationMaterials Research Society Symposium - Proceedings
EditorsN.M. Rodrigues, S.L. Soled, J. Hrbek
PublisherMRS
Pages295-300
Number of pages6
Volume499
StatePublished - 1998
EventProceedings of the 1997 MRS Fall Symposium - Boston, MA, USA
Duration: Dec 2 1997Dec 4 1997

Other

OtherProceedings of the 1997 MRS Fall Symposium
CityBoston, MA, USA
Period12/2/9712/4/97

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials

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