Large-Scale Supramolecular Structure in Solutions of Low Molar Mass Compounds and Mixtures of Liquids: I. Light Scattering Characterization
- 3 February 2006
- journal article
- Published by American Chemical Society (ACS) in The Journal of Physical Chemistry B
- Vol. 110 (9), 4329-4338
- https://doi.org/10.1021/jp0569335
Abstract
Static and dynamic laser light scattering were used to bring evidence of large-scale supramolecular structure in solutions of low molar mass electrolytes, nonelectrolytes, and mixtures of liquids. It was shown that solutes are distributed inhomogeneously on large length scales. Regions of higher and lower solute concentration exist in solution and give sufficient scattering contrast for experimental observation. A detailed light scattering study showed that these regions can be characterized as close-to-spherical discrete domains of higher solute density in a less dense rest of solution. These domains do contain solvent inside and can be therefore characterized as loose associates (giant clusters, aggregates). Their size distributions are significantly broad, ranging up to several hundreds of nanometers. Characteristic sizes of these inhomogenities thus exceed angstrom dimensions of individual molecules by several orders of magnitude. The number of solute molecules per domain varies approximately in the range 10(3)-10(8). Phenomena described were observed in a very broad range of solutes and solvents. Among others, selected data on most common substances of great chemical and biological importance such as sodium chloride, citric acid, glucose, urea, acetic acid, and ethanol are presented.Keywords
This publication has 36 references indexed in Scilit:
- Polyelectrolyte chain dimensions and concentration fluctuations near phase boundariesThe Journal of Chemical Physics, 2003
- Light Scattering on Semidilute Polyelectrolyte Solutions: Ionic Strength and Polyelectrolyte Concentration DependenceThe Journal of Physical Chemistry B, 1997
- The ionic strength dependence of the structure and dynamics of polyelectrolyte solutions as seen by light scattering: The slow mode dilemmaThe Journal of Chemical Physics, 1996
- Optical sizing of small colloidal particles: an optimized regularization techniqueApplied Optics, 1991
- Dynamic light scattering studies of polymer solutions. 6. Polyisoprenes in a .THETA.-solvent, 1,4-dioxaneMacromolecules, 1987
- Comments on the “ordinary–extraordinary phase transition” of poly(lysine)Peptide Science, 1984
- Influence of ionic strength on the diffusion of polystyrene latex spheres, bovine serum albumin, and polynucleosomesThe Journal of Chemical Physics, 1983
- A constrained regularization method for inverting data represented by linear algebraic or integral equationsComputer Physics Communications, 1982
- Ionic strength effects on macroion diffusion and excess light‐scattering intensities of short DNA rodsPeptide Science, 1981
- Interpretation of dynamic scattering from polymer solutionsPolymer, 1980