Mechanism of formation of two-dimensional crystals from latex particles on substrata

O. D. Velev, N. D. Denkov, P. A. Kralchevsky, I. B. Ivanov, Hideyuki Yoshimura, K. Nagayama

Research output: Chapter in Book/Report/Conference proceedingChapterpeer-review

6 Citations (Scopus)

Abstract

The dynamics of two-dimensional ordering of micron-size polystyrene latex on a horizontal glass substrata has been directly observed by means of optical microscopy. It turns out that the ordering starts when the thickness of water layer containing the particles becomes approximately equal to the particle diameter. By variation of the electrolyte concentration, the charge of the particles and their volume fraction, it is proven that neither the electrostatic repulsion nor the van der Waals attraction between the particles are responsible for the formation of the 2D crystals. The observations revealed that two main factors are responsible for the ordering. Attractive capillary forces (due to menisci formed around the particles) are governing the formation of the nuclei of the ordered phase. The growth of the crystals afterwards proceeds due to the convective transport of particles towards the ordered regions. Experiments under controlled crystal growth have been carried out, allowing obtaining of either well ordered monolayers or domains consisting of multilayers (bilayers, trilayers etc.).

Original languageEnglish
Title of host publicationProgress in Colloid & Polymer Science
EditorsP. Laggner, O. Glatter
PublisherPubl by Springer-Verlag GmbH & Company KG
Pages366-367
Number of pages2
Volume93
ISBN (Print)0387914544
Publication statusPublished - 1 Dec 1993
EventProceedings of the 6th European Colloid and Interface Society (ECIS) Conference - Graz, Austria
Duration: 21 Sep 199225 Sep 1992

Conference

ConferenceProceedings of the 6th European Colloid and Interface Society (ECIS) Conference
CityGraz, Austria
Period21/09/9225/09/92

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