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Titolo:
SMALL-ANGLE NEUTRON-SCATTERING INVESTIGATION OF LONG-RANGE CORRELATIONS IN SILICA AEROGELS - SIMULATIONS AND EXPERIMENTS
Autore:
HASMY A; ANGLARET E; FORET M; PELOUS J; JULLIEN R;
Indirizzi:
UNIV MONTPELLIER 2,SCI MAT VITREUX LAB,PL EUGENE BATAILLON F-34095 MONTPELLIER 5 FRANCE
Titolo Testata:
Physical review. B, Condensed matter
fascicolo: 9, volume: 50, anno: 1994,
pagine: 6006 - 6016
SICI:
0163-1829(1994)50:9<6006:SNIOLC>2.0.ZU;2-E
Fonte:
ISI
Lingua:
ENG
Soggetto:
DIFFUSION-LIMITED AGGREGATION; CLUSTER CLUSTER AGGREGATION; 3 DIMENSIONS; SPHERES; MODEL; SIZE; GELS;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Science Citation Index Expanded
Citazioni:
29
Recensione:
Indirizzi per estratti:
Citazione:
A. Hasmy et al., "SMALL-ANGLE NEUTRON-SCATTERING INVESTIGATION OF LONG-RANGE CORRELATIONS IN SILICA AEROGELS - SIMULATIONS AND EXPERIMENTS", Physical review. B, Condensed matter, 50(9), 1994, pp. 6006-6016

Abstract

Numerical simulations of gel formation by off-lattice diffusion-limited cluster-cluster aggregation (DLCA) of identical spherical particlesin a cubic box are performed. Both the correlation function g (r) andthe small-angle scattering function S (q), which is related to the Fourier transform of g (r) - 1, are calculated for the resulting gel structure which is made of connected fractal clusters. In addition to theshort-range features already described in a previous paper, it is found that g (r) goes through a minimum before tending to unity for larger values. As a consequence the scattering function S (q) exhibits a maximum at small q values. After multiplying S (q) by the form factor P(q), the intensity curve I (q) is calculated and its behavior is found to be in good agreement with small-angle neutron-scattering experiments on silica aerogels of various densities. In contrast with previousapproaches, the low-q maximum in the I (q) curve is here directly quantitatively accounted for, without introducing any phenomenological adhoc term to describe the intercluster correlations.

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Documento generato il 02/12/20 alle ore 17:41:31