Utilize este identificador para referenciar este registo: http://hdl.handle.net/10400.21/3644
Título: Criticality of colloids with distinct interaction patches: The limits of linear chains, hyperbranched polymers, and dimers
Autor: Tavares, J. M.
Teixeira, Paulo Ivo Cortez
Gama, M. M. Telo da
Palavras-chave: Association
Critical points
Free energy
Liquid structure
Liquid theory
Short-range order
Data: 26-Ago-2009
Editora: Amer Physical Soc
Citação: TAVARES, J. M.; TEIXEIRA, P. I. C.; GAMA, M. M. Telo da - Criticality of colloids with distinct interaction patches: The limits of linear chains, hyperbranched polymers, and dimers. Physical Review E. ISSN 1539-3755. Vol. 80, nr. 2 (2009), p. 021506-1/021506-12.
Relatório da Série N.º: ;021506
Resumo: We use a simple model of associating fluids which consists 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 bonding interactions between each pair of spots have strengths epsilon(AA), epsilon(BB), and epsilon(AB). The theory is applied over the whole range of bonding strengths and the results are interpreted in terms of the equilibrium cluster structures of the phases. In addition to our numerical results, we derive asymptotic expansions for the free energy in the limits for which there is no liquid-vapor critical point: linear chains (epsilon(AA)not equal 0, epsilon(AB)=epsilon(BB)=0), hyperbranched polymers (epsilon(AB)not equal 0, epsilon(AA)=epsilon(BB)=0), and dimers (epsilon(BB)not equal 0, epsilon(AA)=epsilon(AB)=0). These expansions also allow us to calculate the structure of the critical fluid by perturbing around the above limits, yielding three different types of condensation: of linear chains (AA clusters connected by a few AB or BB bonds); of hyperbranched polymers (AB clusters connected by AA bonds); or of dimers (BB clusters connected by AA bonds). Interestingly, there is no critical point when epsilon(AA) vanishes despite the fact that AA bonds alone cannot drive condensation.
Peer review: yes
URI: http://hdl.handle.net/10400.21/3644
ISSN: 1539-3755
Versão do Editor: http://journals.aps.org/pre/abstract/10.1103/PhysRevE.80.021506
Aparece nas colecções:ISEL - Física - Artigos

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