This article is cited in 4 papers

Polymers

Density-density correlations on a gelatin films surface

D. V. Novikov^a, A. N. Krasovskii<sup>b

a</sup> St. Petersburg State University of Telecommunications
^b St. Petersburg State University of Film and Television

Abstract: The spatial correlations on the surface of films obtained from aqueous solutions of gelatin during cooling from 320 to 293 K have been studied using electron microscopy. It has been shown that the total density fluctuation correlation function on the scale $R >$ 4 nm can be represented in the form $h(R)\sim R^{-n}\exp(-R/\xi)$, where the correlation radius $\xi$ coincides with the hydrodynamic radius of a macromolecule. Unfolding of macromolecules in the coil $\to$ helix transformation leads to a decrease in the density and the fractal dimension of the physical network of pinnings of macromolecules and to variation in the index n of the power term in the function $h(R)$ from $n$ = 1 to 2, due to the transition from a continual type of disorder to a cellular type in a solid.

Received: 22.12.2011

 English version: Physics of the Solid State, 2012, 54:8, 1688–1692

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