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Measuring the Densities of Aqueous Glasses at Cryogenic Temperatures
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Diffusion-viscosity decoupling in supercooled aqueous trehalose solutions.

Horacio R Corti1, Guillermo A Frank, Mario C Marconi

  • 1Departamento Física de Materia Condensada, Centro Atómico Constituyentes, Comisión Nacional de Energía Atómica, Av. General Paz 1499, 1650 San Martín, Argentina. hrcorti@cnea.gov.ar

The Journal of Physical Chemistry. B
|September 25, 2008
PubMed
Summary
This summary is machine-generated.

Disodium fluorescein diffusion in supercooled trehalose solutions follows classical models within a limited temperature range. Ionic solutes like disodium fluorescein show deviations from these models across all studied temperatures.

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Area of Science:

  • Physical Chemistry
  • Solution Dynamics
  • Cryoprotectant Research

Background:

  • Trehalose is a key cryoprotectant in aqueous solutions.
  • Understanding solute diffusion in supercooled liquids is crucial for cryobiology and materials science.
  • The Stokes-Einstein relationship describes particle diffusion in continuum media.

Purpose of the Study:

  • To measure the diffusional mobility of disodium fluorescein in supercooled trehalose solutions.
  • To analyze results using classical hydrodynamic theory (Stokes-Einstein relationship).
  • To compare solute behavior in trehalose and sucrose solutions.

Main Methods:

  • Measurement of disodium fluorescein diffusional mobility.
  • Analysis using the Stokes-Einstein relationship.
  • Comparison with diffusion and conductivity data of other solutes.

Main Results:

  • Disodium fluorescein diffusion adheres to the Stokes-Einstein model within a specific range of reduced temperatures (Tg/T).
  • Decoupling of neutral solutes occurs at higher Tg/T values.
  • Ionic solutes, including disodium fluorescein, exhibit decoupling across the entire studied Tg/T range.

Conclusions:

  • The classical diffusion model is applicable to disodium fluorescein in supercooled trehalose solutions only within a limited temperature window.
  • Ionic solutes demonstrate a broader deviation from classical diffusion behavior compared to neutral solutes in supercooled sugar solutions.