Measurements of Elastic Constants of Colloidal Silica Crystals by Kossel Line Analysis

Measurements of Elastic Constants of Colloidal Silica Crystals by Kossel Line Analysis

We made structure analyses of colloidal crystals in salt-free silica dispersions with water as dispersant by Kossel line analysis and estimated bulk moduli of static elasticity. Due to the density difference between silica particles and water, there were observed sedimentation effects and small but...

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Veröffentlicht in:Langmuir 2001-12, Vol.17 (26), p.8010-8015
Hauptverfasser: Shinohara, Tadatomi, Yoshiyama, Tsuyoshi, Sogami, Ikuo S, Konishi, Toshiki, Ise, Norio
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container_issue 26
container_start_page 8010
container_title Langmuir
container_volume 17
creator Shinohara, Tadatomi
Yoshiyama, Tsuyoshi
Sogami, Ikuo S
Konishi, Toshiki
Ise, Norio
description We made structure analyses of colloidal crystals in salt-free silica dispersions with water as dispersant by Kossel line analysis and estimated bulk moduli of static elasticity. Due to the density difference between silica particles and water, there were observed sedimentation effects and small but still detectable gravitational pressure effects on the colloidal silica crystals. Using laser diffraction by a parallel Ar laser beam, we observed intrinsic Kossel images of colloidal crystals to accurately probe symmetry structure. We photographed the Kossel images of colloidal crystals systematically at different heights and found that the crystals keeping cubic structure received uniform compression due to gravity. High precision measurement of a lattice constant as a function of height enabled us to estimate the elastic moduli of the colloidal crystals.
doi_str_mv 10.1021/la010393v
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title Measurements of Elastic Constants of Colloidal Silica Crystals by Kossel Line Analysis
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