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Effective Interactions between a Pair of Nanoparticles.
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SYSNO ASEP 0459541 Document Type J - Journal Article R&D Document Type Journal Article Subsidiary J Článek ve WOS Title Effective Interactions between a Pair of Nanoparticles. Author(s) Malijevský, Alexandr (UCHP-M) RID, ORCID, SAI Source Title Molecular Physics. - : Taylor & Francis - ISSN 0026-8976
Roč. 113, 9-10 (2015), s. 1170-1178Number of pages 9 s. Language eng - English Country GB - United Kingdom Keywords nanoparticles ; colloids ; density functional theory Subject RIV CF - Physical ; Theoretical Chemistry R&D Projects GA13-02938S GA ČR - Czech Science Foundation (CSF) Institutional support UCHP-M - RVO:67985858 UT WOS 000354790400025 EID SCOPUS 84929966120 DOI 10.1080/00268976.2015.1015640 Annotation We investigate the effective interactions between two nanoparticles (or colloids) immersed in a solvent exhibiting two-phase separation. Using a non-local density functional theory, we determine the dependence of the effective potential on the separation of the nanoparticles when the solvent is near bulk two-phase coexistence. If identical nanoparticles preferentially adsorbing phase alpha are inserted into phase beta, thick wetting layers of the preferable phase alpha develop at their surfaces. At some particular separation h(b) of the nanoparticles, the wetting layers connect to form a single bridge, and the induced effective potential becomes strongly attractive for all distances h < h(b). The bridging is a first order capillary condensation like transition for all radii of the nanoparticles greater than the critical radius R-c, the value of which was estimated to be approximately R-c approximate to 20 sigma for a temperature T/T-c approximate to 0.9, where sigma is the size of the solvent (square-well) particles. For radii R < R-c the process of bridging is continuous. If the same particles are inserted into the preferable phase alpha, the only effective interaction between them is induced by the short-ranged depletion potential. If the nanoparticles have opposite adsorption preferences, only a single wetting layer forms around one of the nanoparticles and the effective interaction is strongly repulsive in both phases. The repulsion, induced by a disruption of the wetting film by the presence of the second particle, is larger and slightly longer-ranged in a low density state. Workplace Institute of Chemical Process Fundamentals Contact Eva Jirsová, jirsova@icpf.cas.cz, Tel.: 220 390 227 Year of Publishing 2017
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