Show/Hide Menu
Hide/Show Apps
anonymousUser
Logout
Türkçe
Türkçe
Search
Search
Login
Login
OpenMETU
OpenMETU
About
About
Open Science Policy
Open Science Policy
Communities & Collections
Communities & Collections
Help
Help
Frequently Asked Questions
Frequently Asked Questions
Videos
Videos
Thesis submission
Thesis submission
Publication submission with DOI
Publication submission with DOI
Publication submission
Publication submission
Contact us
Contact us
Rotational and translational diffusion of a rodlike virus in random coil polymer solutions
Date
1997-08-25
Author
Cush, R
Russo, PS
Kucukyavuz, Z
Bu, ZM
Neau, D
Shih, D
Kucukyavuz, S
Ricks, H
Metadata
Show full item record
This work is licensed under a
Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International License
.
Item Usage Stats
17
views
0
downloads
Cite This
Depolarized dynamic light scattering was used to measure the translational and rotational diffusion of tobacco mosaic virus, TMV, in aqueous solutions of dextran (M similar to 505 000). TMV is an electrically charged, nucleoprotein assembly with the shape of a stiff, rigid rod. Dextran is an uncharged, flexible carbohydrate polymer. The TMV was held at a fixed, dilute concentration (0.5 mg/mL), while the concentration of dextran spanned both dilute and semidilute regimes (0-14.5% by weight). There was no evidence of phase separation or strong aggregation of the TMV particles in the presence of the dextran. The TMV particles dominated the depolarized scattering at all dextran concentrations. The angular variation of the decay rates of the autocorrelation functions always followed the form expected for symmetric top molecules in the absence of translational-rotational coupling. Nevertheless, translational and rotational motions are almost surely coupled in most dextran-containing solutions. The apparent translational and rotational diffusion rates decreased with added dextran, but not exactly according to the rise in macroscopic solution viscosity. A transition occurred at about 6.5% dextran. Beyond this concentration, pronounced failures of the continuum (Stokes-Einstein) relation between diffusion and viscosity were found. Translational diffusion continued more rapidly than expected on the basis of the macroscopic viscosity, while rotational diffusion fell sharply below expectation. The quotient D-r/D-t of rotational and translational diffusion, which presumably cancels effects due to viscosity, also dropped suddenly above the transition point. These findings are consistent with a sudden onset of topological constraints to rotational motion of the TMV, without onset of severe constraints to translational motion. Temperature dependent studies showed that either the solution or the solvent viscosity can describe translation and rotation fairly well, at least at concentrations below the transition. Energies of activation for translational and rotational diffusion of TMV were similar and not strongly dependent on dextran concentration in this regime.
Subject Keywords
Dynamic light-scattering
,
Polystyrene latex spheres
,
Rod-like macromolecules
,
Tobacco mosaic-virus
,
Hydrodynamic scaling model
,
Self-diffusion
,
Rigid-rod
,
Concentrated-solution
,
Semidilute solutions
,
Integral-equations
URI
https://hdl.handle.net/11511/68456
Journal
MACROMOLECULES
DOI
https://doi.org/10.1021/ma970032f
Collections
Department of Chemistry, Article
Citation Formats
IEEE
ACM
APA
CHICAGO
MLA
BibTeX
R. Cush et al., “Rotational and translational diffusion of a rodlike virus in random coil polymer solutions,”
MACROMOLECULES
, vol. 30, no. 17, pp. 4920–4926, 1997, Accessed: 00, 2020. [Online]. Available: https://hdl.handle.net/11511/68456.