Growth of local structure in colloidal suspensions

Ito, Katsura; Okumura, Hiroya; Yoshida, Hiroshi; Ise, Norio

doi:10.1103/physrevb.41.5403

Cited by 8 publications

(3 citation statements)

References 17 publications

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“…In this section, we discuss how the structural inhomogeneity varies with time only briefly, since detailed accounts have already been given by us. 22,24,25 First the ordering of latices was confirmed by the microscope and then the structure was destroyed by addition of sodium chloride (at a concentration of mol dmP3). The crystallisation was allowed to take place by putting ion-exchange resin beads in the suspension, which removed the added salt ions.…”

Section: Change With Time Of the Structural Inhomogeneity: Growth Of ...mentioning

confidence: 99%

Inhomogeneity of solute distribution in ionic systems

Ise¹,

Matsuoka²,

Ito³

et al. 1990

Faraday Discuss. Chem. Soc.

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By using video imagery and an image data analyser, the ordering phenomena of polymer latex particles in dilute suspensions have been studied. The micrographs clearly showed the existence of localised ordered structure coexisting with disordered particles, and furthermore, fairly long-lived void structures were noted. The lattice vibrations of the particles on two adjoining lattice planes were shown to be coupled. Lattice defects were also found and the lattice vibration of the particle around the defect was anisotropic. The growth of the localised structure was found to obey the Ostwald ripening mechanism. All these findings validate the existence of an interparticle long-range attraction in addition to the short-range repulsion.

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Section: Change With Time Of the Structural Inhomogeneity: Growth Of ...mentioning

confidence: 99%

Inhomogeneity of solute distribution in ionic systems

Ise¹,

Matsuoka²,

Ito³

et al. 1990

Faraday Discuss. Chem. Soc.

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“…Hachisu aging various crystal planes with the inverse microscope. 27 Yoshida et al 18,28 compared results obtained by light diffraction and by light microscopy. Using a fluorescence microscope they were able to distinguish fluorescent particles of diameter of only 140 nm.…”

Section: Introductionmentioning

confidence: 99%

Direct observation of stacking disorder in a colloidal crystal

Verhaegh

Duijneveldt

Blaaderen

et al. 1995

The Journal of Chemical Physics

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Colloidal crystals of rhodamine labeled silica spheres dispersed in chloroform have been studied with fluorescence confocal scanning laser microscopy. We report the first determination of the three-dimensional crystalline stacking in the bulk of a concentrated dispersion. The structure was found to consist of a random stacking of close-packed planes. The results are compared with light scattering experiments.

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“…More and more experimental evidence is being accumulated which is in disagreement with this assumption. Besides the void formation, the Ostwald ripening mechanism in colloidal crystal growth, re-entrant phase separation, vapor−liquid condensation, and positive adsorption of ionic species near a like-charged interface 39 can be understood without additional ad hoc assumptions if we accept the attraction−repulsion assumption. Finally, it should be mentioned that the attraction−repulsion assumption corrects “one of three fallacies in the theories of colloidal structure” pointed out by Langmuir …”

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confidence: 99%