Small-angle X-ray Scattering; Gaussian random fields; Gels
Abstract :
[en] Time-resolved small-angle x-ray scattering (SAXS) is used to follow the formation of resorcinol-formaldehyde (RF) gels. An existing morphological model based on Gaussian random fields, and validated on RF aerogels, is generalized to analyze the data. The generalization is done in two different ways, one being relevant to colloid aggregation and the other to microphase separation. The SAXS data do not enable discrimination between the two mechanisms of gel formation, which shows that aggregation and microphase separation can generate very similar morphologies at the length scales explored by SAXS. Furthermore, physical arguments
suggest that, in the case of RF gels, aggregation and microphase separation can be regarded as two idealizations of the same complex physical process.
Disciplines :
Mathematics Materials science & engineering
Author, co-author :
Gommes, Cédric ; Université de Liège - ULiège > Département de chimie appliquée > Génie chimique - Génie catalytique
Roberts, Anthony
Language :
English
Title :
Structure development of resorcinol-formaldehyde gels: either microphase separation or colloid aggregation
Publication date :
2008
Journal title :
Physical Review. E, Statistical, Nonlinear, and Soft Matter Physics
ISSN :
1539-3755
eISSN :
1550-2376
Publisher :
American Physical Society, College Park, United States - Maryland
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