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dc.contributor.authorHornak, Josephen_US
dc.contributor.authorMoscicki, J.en_US
dc.contributor.authorSchneider, Donalden_US
dc.contributor.authorFreed, J.en_US
dc.date.accessioned2006-07-19T19:37:27Zen_US
dc.date.available2006-07-19T19:37:27Zen_US
dc.date.issued1986-03-15en_US
dc.identifier.citationThe Journal of Chemical Physics 84N6 (1986) 3387-3395en_US
dc.identifier.issn0021-9606en_US
dc.identifier.urihttp://hdl.handle.net/1850/2161en_US
dc.description.abstractWe report on the use of ESR imaging for determining the translational diffusion constants of typical ESR spin probes in ordered and isotropic solvents. A discussion is given for a Fourier deconvolution method for determining the correct concentration profile if there is more than one hyperfine line in the spectrum of the radical as well as a spatial dependence of the spectrometer sensitivity. A simple but approximate subtraction deconvolution method is also presented. The diffusion constants for 4-oxo-2,2,6,6-tetramethylpiperidine-1-oxyl (TEMPONE) in the nematic and isotropic phases of the liquid crystal p-pentylbenzylidine-p-butylanaline (5,4) were determined. In the isotropic phase the diffusion coefficient is isotropic (D=2.5×10–6 cm2 s–1, at 50 °C), while in the nematic phase it was found to be mildly anisotropic. The diffusion coefficients for motion perpendicular and parallel to the director axis in the nematic phase are respectively, D =9.0×10–7 cm2 s–1, D =6.4×10–7 cm2 s–1 at 27 °C. This is interpreted in terms of some smectic-like character in the nematic phase of 5,4. Possible improvements in the technique are also discussed. The Journal of Chemical Physics is copyrighted by The American Institute of Physics.en_US
dc.format.extent38937 bytesen_US
dc.format.mimetypeapplication/pdfen_US
dc.language.isoen_USen_US
dc.publisherAmerican Institute of Physics: The Journal of Chemical Physicsen_US
dc.subjectConcentration profileen_US
dc.subjectDiffusion coefficientsen_US
dc.subjectESR imagingen_US
dc.titleDiffusion coefficients in anisotropic fluids by ESR imaging of concentration profilesen_US
dc.typeAbstracten_US
dc.identifier.urlhttp://dx.doi.org/10.1063/1.450221


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