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Sucrose diffusion in aqueous solution.

Hannah C Price1, Johan Mattsson, Benjamin J Murray

  • 1School of Earth and Environment, University of Leeds, Leeds, UK. hannah.price@ncas.ac.uk.

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|July 2, 2016
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Summary
This summary is machine-generated.

We measured sucrose diffusion coefficients in concentrated aqueous solutions. Sucrose diffusion is much slower than water diffusion, with implications for cryopreservation and atmospheric science.

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Area of Science:

  • Physical Chemistry
  • Chemical Engineering

Background:

  • Diffusion of solutes in aqueous solutions is crucial for natural and technological processes.
  • Direct measurements of sugar diffusion coefficients at low water content are limited.

Purpose of the Study:

  • To directly measure sucrose diffusion coefficients in aqueous solutions at low water content.
  • To evaluate the applicability of the Stokes-Einstein equation for predicting sucrose diffusion.

Main Methods:

  • Utilized a Raman isotope tracer method to monitor sucrose diffusion.
  • Measured diffusion across a boundary between non-deuterated and deuterated sucrose solutions.
  • Conducted measurements at a water activity of 0.4 (90 wt% sucrose) at room temperature.

Main Results:

  • Determined sucrose diffusion coefficients at a water activity of 0.4.
  • Found sucrose diffusion to be approximately four orders of magnitude slower than water diffusion.
  • Showed the Stokes-Einstein equation accurately predicts sucrose diffusion under studied conditions.

Conclusions:

  • Provided direct measurements of sucrose diffusion coefficients in concentrated aqueous solutions.
  • Highlighted the significant difference between sucrose and water diffusion rates.
  • Suggested implications for cryopreservation, atmospheric science, and fundamental understanding of diffusion.