Structural Development In Silica Systems

Dokter, WH Wim; Beelen, Tpm Theo; Garderen, van Hf; Santen, van Ra Rutger

doi:10.1557/proc-346-217

Cited by 3 publications

(3 citation statements)

References 13 publications

(13 reference statements)

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“…[23][24][25] The values of the fractal dimension D obtained experimentally by SAXS may be compared to those obtained by computer simulation based on different growth models (e.g., diffusion-limited aggregation, DLA, reaction limited aggregation, RLA). [26][27][28][29][30][31][32][33] Therefore, SAXS is the proper technique for characterizing the mechanisms of growth in solutions of colloidal particles.…”

Section: Scattering Intensity By Aggregatesmentioning

confidence: 99%

“…Under suitable conditions, many types of colloidal aggregates exhibit a fractal structure. For these objects, named mass fractals, , the exponent D may have noninteger values within the interval 1< D < 3. − The values of the fractal dimension D obtained experimentally by SAXS may be compared to those obtained by computer simulation based on different growth models (e.g., diffusion-limited aggregation, DLA, reaction limited aggregation, RLA). − Therefore, SAXS is the proper technique for characterizing the mechanisms of growth in solutions of colloidal particles.…”

Section: Saxs Analysismentioning

confidence: 99%

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Synchrotron SAXS Study of the Mechanisms of Aggregation of Sulfate Zirconia Sols

et al. 2003

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This is a systematic investigation, using in situ synchrotron small-angle X-ray scattering, of the mechanisms of aggregation of sulfate zirconia sols under different preparation conditions. We have studied the effects of the variations of acid, water, and sulfate contents on the process of aggregate growth. These effects were investigated using open and sealed sample cells. It was observed that two clearly different mechanisms govern the aggregation at the beginning and at advanced stages of the process. In the early stages, small needle-shaped clusters are formed. They have a time independent cross-section and progressively grow by increasing their length. At advanced stages, the initially isolated needle-shaped clusters start to build up a 3D structure, their aggregation being governed by the classical mechanism of diffusion-limited cluster aggregation (DLCA). The experimental results also suggested an effect of sulfate concentration on the structure of the aggregates. Even though the structures of the final sols vary markedly due to differences in the chemical and physical preparation conditions, our experimental results suggest that a single and remarkably simple model explains the aggregation process for all the studied solutions.

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Section: Scattering Intensity By Aggregatesmentioning

confidence: 99%

Section: Saxs Analysismentioning

confidence: 99%

Synchrotron SAXS Study of the Mechanisms of Aggregation of Sulfate Zirconia Sols

et al. 2003

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“…In previous studies carried out by our group [3][4][5] the formation of silicas from water glass solutions was investigated at pH 4. Water glass was mixed into the acidic solution, and subsequently the reaction vessel was left unstirred.…”

Section: Introductionmentioning

confidence: 99%