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Titolo: SMALLANGLE NEUTRONSCATTERING INVESTIGATION OF SHORTRANGE CORRELATIONS IN FRACTAL AEROGELS  SIMULATIONS AND EXPERIMENTS
Autore: HASMY A; FORET M; PELOUS J; JULLIEN R;
 Indirizzi:
 UNIV MONTPELLIER 2,SCI MAT VITREUX LAB,PL EUGENE BATAILLON F34095 MONTPELLIER 5 FRANCE
 Titolo Testata:
 Physical review. B, Condensed matter
fascicolo: 13,
volume: 48,
anno: 1993,
pagine: 9345  9353
 SICI:
 01631829(1993)48:13<9345:SNIOSC>2.0.ZU;2F
 Fonte:
 ISI
 Lingua:
 ENG
 Soggetto:
 LIMITED AGGREGATION; CLUSTERS; MODELS;
 Tipo documento:
 Article
 Natura:
 Periodico
 Settore Disciplinare:
 Science Citation Index Expanded
 Citazioni:
 24
 Recensione:
 Indirizzi per estratti:



 Citazione:
 A. Hasmy et al., "SMALLANGLE NEUTRONSCATTERING INVESTIGATION OF SHORTRANGE CORRELATIONS IN FRACTAL AEROGELS  SIMULATIONS AND EXPERIMENTS", Physical review. B, Condensed matter, 48(13), 1993, pp. 93459353
Abstract
The centertocenter interparticledistance distribution function f(r) and its Fourier transform, the scattering function S(q), are computed for simulated fractal aggregates made of identical spherical particles using several threedimensional offlattice clustercluster algorithms. As expected f(r) exhibits a delta peak at the particle diameter followed by a discontinuity at twice this distance as a consequence of the nonoverlapping character of the spherical particles. As a result the curve log10S(q) versus log10q goes through a broad minimum followedby damped oscillations at largeq values. These simulations are compared with experimental smallangle neutronscattering results on colloidal silica aerogels. The experimental scattering function S(q) is derived from the ratio between the scattered intensity I(q) and the form factor P(q) determined from measurements on the diluted colloidal solution. The agreement between simulations and experiments is qualitatively good and the influence of aerogel density is well accounted for. Thedeparture of the experimental curves from the theoretical S(q) curve,which is stronger for larger particle sizes, is attributed to shortwavelength corrections to the simple scattering theory.
ASDD Area Sistemi Dipartimentali e Documentali, Università di Bologna, Catalogo delle riviste ed altri periodici
Documento generato il 02/12/20 alle ore 17:45:01