Premium
Small‐angle X‐ray scattering by PVP–water mixtures
Author(s) -
Van Der Elsken Jan,
Bras Wim,
Michielsen Jan
Publication year - 2001
Publication title -
journal of applied crystallography
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.429
H-Index - 162
ISSN - 1600-5767
DOI - 10.1107/s0021889800018689
Subject(s) - scattering , wide angle x ray scattering , small angle x ray scattering , small angle scattering , materials science , hexagonal crystal system , grazing incidence small angle scattering , small angle neutron scattering , optics , crystallography , molecular physics , x ray , biological small angle scattering , condensed matter physics , chemistry , neutron scattering , physics
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.