Utilize este identificador para referenciar este registo: http://hdl.handle.net/10400.21/3638
Título: How patchy can one get and still condense? The role of dissimilar patches in the interactions of colloidal particles
Autor: Tavares, J. M.
Teixeira, Paulo Ivo Cortez
Gama, M.M. Telo da
Palavras-chave: Patchy colloids
Phase diagram
Critical point
Data: 1-Fev-2009
Editora: Taylor & Francis Ltd
Citação: TAVARES. J. M.; TEIXEIRA, P.I.C.; GAMA, M. M. Telo da - How patchy can one get and still condense? The role of dissimilar patches in the interactions of colloidal particles. Molecular Physics: An International Journal at the Interface Between Chemistry and Physics. ISSN 0026-8976. Vol. 107, nr. 4-6 (2009), p. 453-466.
Relatório da Série N.º: ;PII 911461489
Resumo: We investigate the influence of strong directional, or bonding, interactions on the phase diagram of complex fluids, and in particular on the liquid-vapour critical point. To this end we revisit a simple model and theory for associating fluids which consist of spherical particles having a hard-core repulsion, complemented by three short-ranged attractive sites on the surface (sticky spots). Two of the spots are of type A and one is of type B; the interactions between each pair of spots have strengths [image omitted], [image omitted] and [image omitted]. The theory is applied over the whole range of bonding strengths and results are interpreted in terms of the equilibrium cluster structures of the coexisting phases. In systems where unlike sites do not interact (i.e. where [image omitted]), the critical point exists all the way to [image omitted]. By contrast, when [image omitted], there is no critical point below a certain finite value of [image omitted]. These somewhat surprising results are rationalised in terms of the different network structures of the two systems: two long AA chains are linked by one BB bond (X-junction) in the former case, and by one AB bond (Y-junction) in the latter. The vapour-liquid transition may then be viewed as the condensation of these junctions and we find that X-junctions condense for any attractive [image omitted] (i.e. for any fraction of BB bonds), whereas condensation of the Y-junctions requires that [image omitted] be above a finite threshold (i.e. there must be a finite fraction of AB bonds).
Peer review: yes
URI: http://hdl.handle.net/10400.21/3638
ISSN: 0026-8976
Versão do Editor: http://www.tandfonline.com/doi/abs/10.1080/00268970902852616#.U6GqKoZJ6vw
Aparece nas colecções:ISEL - Física - Artigos

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