Monday, July 23, 2012

1207.4896 (Damjan Pelc et al.)

Role of microscopic phase separation in gelation of aqueous gelatin
solutions
   [PDF]

Damjan Pelc, Sanjin Marion, Miroslav Požek, Mario Basletić
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.
View original: http://arxiv.org/abs/1207.4896

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