Two fractal structures in aerogel

Marlière, C.; Woignier, Thierry; Dieudonné, Philippe; Primera, Juan; Lamy, M.; Phalippou, J.

doi:10.1016/s0022-3093(01)00450-1

Cited by 50 publications

(46 citation statements)

References 18 publications

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“…For this concentration range, the aerosil particles may be assumed to play no role in establishing network connectivity, in that they do not participate in load transfer. Above the percolation threshold for concentrations >40%, it has been shown that the structure is made of two imbricate networks: one polymeric, the other of aerosil [15]. The mechanical properties rapidly increase with aerosil content above 40% and the mean pore diameter also increases.…”

Section: Discussionmentioning

confidence: 99%

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The use of silica aerogels as host matrices for chemical species

Woignier

Primera

Lamy

et al. 2004

Journal of Non-Crystalline Solids

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Section: Discussionmentioning

confidence: 99%

“…In this concentration range, the density increases from 0.26 to 0.31 g cm À3 . The aerosil addition improves the mechanical properties, but also affects the aggregation process, the aerogel structure [15] and the pore-size distribution [12]. Fig.…”

Section: Improvement Of the Mechanical Properties By Addition Of Oxidmentioning

confidence: 97%

The use of silica aerogels as host matrices for chemical species

Woignier

Primera

Lamy

et al. 2004

Journal of Non-Crystalline Solids

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“…(1) which introduces the cutoff L (Marlière et al 2001). where I is the scattered intensity, q is the wave vector, ρ is the bulk density of the sample, Γ(x) is the gamma function, and A is a normalization constant.…”

Section: Change In Soil Porosity During the Incubation Of Organic Mattermentioning

confidence: 99%

Compost addition reduces porosity and chlordecone transfer in soil microstructure

Woignier

Clostre²,

Fernandes³

et al. 2015

Environ Sci Pollut Res

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Chlordecone, an organochlorine insecticide, pollutes soils and contaminates crops and water resources and is biomagnified by food chains. As chlordecone is partly trapped in the soil, one possible alternative to decontamination may be to increase its containment in the soil, thereby reducing its diffusion into the environment. Containing the pesticide in the soil could be achieved by adding compost because the pollutant has an affinity for organic matter. We hypothesized that adding compost would also change soil porosity, as well as transport and containment of the pesticide. We measured the pore features and studied the nanoscale structure to assess the effect of adding compost on soil microstructure. We simulated changes in the transport properties (hydraulic conductivity and diffusion) associated with changes in porosity. During compost incubation, the clay microstructure collapsed due to capillary stresses. Simulated data showed that the hydraulic conductivity and diffusion coefficient were reduced by 95 and 70% in the clay microstructure, respectively. Reduced transport properties affected pesticide mobility and thus helped reduce its transfer from the soil to water and to the crop. We propose that the containment effect is due not only to the high affinity of chlordecone for soil organic matter but also to a trapping mechanism in the soil porosity.

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“…The data from the SAXS experiments provided three types of information on the fractal geometry. These were: the size of the clusters ( ), the size of the primary particles (a), and the fractal dimension (Df), which expresses the compactness of the clusters, that is, the spatial arrangement of the matter inside the fractal clusters [34][35][36][37]. The primary particles (a) are the building blocks of the clusters and the cluster size ( ) which represents the high limit of the fractal structure.…”

Section: Soil Structure Measurementsmentioning

confidence: 99%