ANTIGRANULOCYTES STRUCTURE AND FRACTAL DOMAINS OF SILICA AEROGELS

被引：23

作者：

ROUSSET, JL ^{[1
]}

BOUKENTER, A ^{[1
]}

CHAMPAGNON, B ^{[1
]}

DUMAS, J ^{[1
]}

DUVAL, E ^{[1
]}

QUINSON, JF ^{[1
]}

SERUGHETTI, J ^{[1
]}

机构：

[1] UNIV LYON 1,DEPT PHYS MAT,F-69622 VILLEURBANNE,FRANCE

来源：

JOURNAL OF PHYSICS-CONDENSED MATTER | 1990年 / 2卷 / 42期

关键词：

D O I：

10.1088/0953-8984/2/42/021

中图分类号：

O469 [凝聚态物理学];

学科分类号：

070205 ;

摘要：

Observation of silica aerogels by scanning electron microscopy and transmission electron microscopy are presented. They are supplemented by information on pore volume and pore size distribution determined by thermoporometry. Comparison with small-angle neutron scattering allows precise characterization of the fractal domains. The authors identify three classes of structure. Primary chains, 30-50 AA in diameter, form the substructures of grains whose size varies from 100 to 500 AA depending on density. The grains form large-scale aggregates, leading to pores on scales exceeding 1000 AA. Since the system is demonstrated to be fractal between the chain and grain dimensions, they re-examine the phonon-fracton crossover and the fracton dimensionality determined by Brillouin scattering and Raman scattering.

引用

页码：8445 / 8455

页数：11

共 22 条

[1] RELAXATION AND NONRADIATIVE DECAY IN DISORDERED-SYSTEMS .2. 2-FRACTION INELASTIC-SCATTERING
ALEXANDER, S
ENTINWOHLMAN, O
ORBACH, R
[J]. PHYSICAL REVIEW B, 1986, 33 (06): : 3935 - 3946
[2] ALEXANDER S, 1982, J PHYS LETT-PARIS, V43, pL625, DOI 10.1051/jphyslet:019820043017062500
[3] VIBRATIONAL-MODES IN SILICA AEROGELS - LOW-FREQUENCY RAMAN-SCATTERING
BOUKENTER, A
CHAMPAGNON, B
DUVAL, E
ROUSSET, JL
DUMAS, J
SERUGHETTI, J
[J]. JOURNAL OF PHYSICS C-SOLID STATE PHYSICS, 1988, 21 (34): : L1097 - L1102
[4] LOW-FREQUENCY RAMAN-SCATTERING FROM FRACTAL VIBRATIONAL-MODES IN A SILICA-GEL
BOUKENTER, A
CHAMPAGNON, B
DUVAL, E
DUMAS, J
QUINSON, JF
SERUGHETTI, J
[J]. PHYSICAL REVIEW LETTERS, 1986, 57 (19) : 2391 - 2394
[5] LOW-FREQUENCY RAMAN-SCATTERING FROM DISORDERED OR HETEROGENEOUS MATERIALS
BOUKENTER, A
CHAMPAGNON, B
DUVAL, E
ROUSSET, JL
ROSENBERG, HM
[J]. PHILOSOPHICAL MAGAZINE B-PHYSICS OF CONDENSED MATTER STATISTICAL MECHANICS ELECTRONIC OPTICAL AND MAGNETIC PROPERTIES, 1989, 59 (01): : 125 - 131
[6] LOW-DENSITY SILICA AEROGELS OBSERVED BY HIGH-RESOLUTION ELECTRON-MICROSCOPY
BOURRET, A
[J]. EUROPHYSICS LETTERS, 1988, 6 (08): : 731 - 737
[7] SOL-]GEL-]GLASS .1. GELATION AND GEL STRUCTURE
BRINKER, CJ
SCHERER, GW
[J]. JOURNAL OF NON-CRYSTALLINE SOLIDS, 1985, 70 (03) : 301 - 322
[8] NEW METHOD FOR SIMULTANEOUS DETERMINATION OF SIZE AND SHAPE OF PORES - THERMOPOROMETRY
BRUN, M
LALLEMAND, A
QUINSON, JF
EYRAUD, C
[J]. THERMOCHIMICA ACTA, 1977, 21 (01) : 59 - 88
[9] LOW-TEMPERATURE PROPERTIES OF SILICA AEROGELS
CALEMCZUK, R
DEGOER, AM
SALCE, B
MAYNARD, R
ZAREMBOWITCH, A
[J]. EUROPHYSICS LETTERS, 1987, 3 (11): : 1205 - 1211
[10] BRILLOUIN-SCATTERING MEASUREMENTS OF PHONON-FRACTON CROSSOVER IN SILICA AEROGELS
COURTENS, E
PELOUS, J
PHALIPPOU, J
VACHER, R
WOIGNIER, T
[J]. PHYSICAL REVIEW LETTERS, 1987, 58 (02) : 128 - 131

← 1 2 3 →