J. Appl. Cryst. (2001). 34, 62-64 [ doi:10.1107/S0021889800018689 ]
Abstract: Small-angle X-ray scattering experiments reveal the formation of large-scale structures when a 60 wt% poly(vinylpyrrolidone) (PVP)-water mixture is cooled to 260 K. The formation of these structures leads to an enhancement of continuous small-angle scattering with decreasing temperature. This is accompanied by the appearance of sharp Bragg peaks that have a very short lifetime. The scattering angles of these peaks are in accordance with a hexagonal columnar structure. It appears that such structures occasionally live long enough to undergo rotational Brownian motion.
Keywords: small-angle X-ray scattering; poly(vinylpyrrolidone)-water; temperature-dependent scattering; phase transitions.
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