RIT Digital Archive

Diffusion coefficients in anisotropic fluids by ESR imaging of concentration profiles

RIT Digital Archive

Show simple item record

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

Files in this item

Files Size Format View

There are no files associated with this item.

This item appears in the following Collection(s)

Show simple item record

Search RIT Digital Archive

Advanced Search


My Account