Role of microscopic phase separation in gelation of aqueous gelatin solutions

Using a unique home-made cell for four-contact impedance spectroscopy of conductive liquid samples, we establish the existence of two low frequency conductivity relaxations in aqueous solutions of gelatin, in both liquid and gel state. A comparison with diffusion measurements using pulsed field grad...

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Bibliographic Details
Published in:arXiv.org 2012-07
Main Authors: Pelc, Damjan, Sanjin Marion, Požek, Miroslav, Basletić, Mario
Format: Article
Language:English
Subjects:
Aqueous solutions
Diffusion rate
Gelatin
Gelation
Helices
NMR
Nuclear magnetic resonance
Phase separation
Self diffusion
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Summary:Using a unique home-made cell for four-contact impedance spectroscopy of conductive liquid samples, we establish the existence of two low frequency conductivity relaxations in aqueous solutions of gelatin, in both liquid and gel state. A comparison with diffusion measurements using pulsed field gradient NMR shows that the faster relaxation process is due to gelatin macromolecule self-diffusion. This single molecule diffusion is mostly insensitive to the macroscopic state of the sample, implying that the gelation of gelatin is not a percolative phenomenon, but is caused by aggregation of triple helices into a system-spanning fibre network.
ISSN:2331-8422
DOI:10.48550/arxiv.1207.4896