Dynamic light scattering studies on charged rod-like fd-virus in dilute aqueous solution
1990; American Institute of Physics; Volume: 92; Issue: 12 Linguagem: Inglês
10.1063/1.458249
ISSN1520-9032
AutoresSusanne Schulz, Erich E. Maier, R. Krause, M. Hagenbüchle, M. Deggelmann, Reinhart Weber,
Tópico(s)Material Dynamics and Properties
ResumoTime correlation functions of the scattered light intensity are studied in aqueous solutions of charged rod-like fd-virus (L=880 nm, d=6 nm) at various ionic strengths. The short time behavior of the correlation function is dominated by the static structure factor S(q) which is also independently determined from static light scattering experiments. Comparison of correlation functions of solutions with high ionic strength (screened Coulomb interaction) and those of solutions with liquid-like nearest neighbor order (strong Coulomb interaction) shows different single particle diffusion coefficients on medium time scales at high scattering vectors, where mainly single particle properties are observed by light scattering. The single particle diffusion coefficient decreases with increasing structure peak height of the solutions. At low scattering vectors an extra slow mode component of the correlation function is observed for solutions with Coulomb interaction.
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