Diffusion coefficients in anisotropic fluids by ESR imaging of concentration profiles

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dc.contributor.author Hornak, Joseph en_US
dc.contributor.author Moscicki, J. en_US
dc.contributor.author Schneider, Donald en_US
dc.contributor.author Freed, J. en_US
dc.date.accessioned 2006-07-19T19:37:27Z en_US
dc.date.available 2006-07-19T19:37:27Z en_US
dc.date.issued 1986-03-15 en_US
dc.identifier.citation The Journal of Chemical Physics 84N6 (1986) 3387-3395 en_US
dc.identifier.issn 0021-9606 en_US
dc.identifier.uri http://hdl.handle.net/1850/2161 en_US
dc.description.abstract We 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.extent 38937 bytes en_US
dc.format.mimetype application/pdf en_US
dc.language.iso en_US en_US
dc.publisher American Institute of Physics: The Journal of Chemical Physics en_US
dc.subject Concentration profile en_US
dc.subject Diffusion coefficients en_US
dc.subject ESR imaging en_US
dc.title Diffusion coefficients in anisotropic fluids by ESR imaging of concentration profiles en_US
dc.type Abstract en_US
dc.identifier.url http://dx.doi.org/10.1063/1.450221

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