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The anomaly of oxygen diffusion in aqueous xanthan solutions

Authors

  • Chester S. Ho,

    Corresponding author
    1. Department of Chemical Engineering, State University of New York at Buffalo, Buffalo, New York 14260
    Current affiliation:
    1. Invitron Corporation, 4849 LcBourget Drive, St. Louis, MO 63134
    • Department of Chemical Engineering, State University of New York at Buffalo, Buffalo, New York 14260
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  • Lu-Kwang Ju,

    1. Department of Chemical Engineering, State University of New York at Buffalo, Buffalo, New York 14260
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  • Raymond F. Baddour

    1. Department of Chemical Engineering, Massachusetts Institute of Technology, Cambridge, Massachusetts 02139
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Abstract

A membrane-covered polarographic oxygen electrode was used to measure oxygen diffusion coefficients in aqueous polyelectrolyte solutions of xanthan gum, sodium alginate, and sodium carboxymethylcellulose (CMC). In sodium alginate solutions, dilute xanthan solutions, and solutions containing more than 0.3 wt % CMC, oxygen diffusion coefficients decrease with increasing polymer concentrations. Interestingly, in dilute CMC solutions and concentrate xanthan solutions containing more than 0.5 wt % xanthan gum, oxygen diffusion coefficients increase with increasing polymer concentrations, and values exceeding that in pure water are generally observed.

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