On growth rate hysteresis and catastrophic crystal growth

• Tipo: Artigo em Revista Científica Internacional
• Data: 2013

Autores

Cecília Ferreira (Autor) FEUP; Fernando A. Rocha (Autor) FEUP; Ana M. Damas (Autor) Outra; Pedro M. Martins (Autor) ICBAS

Revista

Título: Journal of Crystal Growth

Vol. 368

Páginas: 47-55

ISSN: 0022-0248

Editora: Elsevier

Indexação

ISI Web of Knowledge - 8 Citações

ISI Web of Science

Scopus - 8 Citações

INSPEC

Classificação Científica

CORDIS: Ciências Tecnológicas > Engenharia > Engenharia química

FOS: Ciências da engenharia e tecnologias > Engenharia dos materiais

Projetos Associados

PTDC/BIA-PRO/101260/2008 - Crescimento de Cristais de Proteínas com Propriedades de Difracção de Raios-X de Elevada Qualidade

Outras Informações

ID Authenticus: P-001-ZY9

DOI: 10.1016/j.jcrysgro.2013.01.016

Abstract (EN): Different crystal growth rates as supersaturation is increasing or decreasing in impure media is a phenomenon called growth rate hysteresis (GRH) that has been observed in varied systems and applications, such as protein crystallization or during biomineralization. We have recently shown that the transient adsorption of impurities onto newly formed active sites for growth (or kinks) is sensitive to the direction and rate of supersaturation variation, thus providing a possible explanation for GRH [6]. In the present contribution, we expand on this concept by deriving the analytical expressions for transient crystal growth based on the energetics of growth hillock formation and kink occupation by impurities. Two types of GRH results are described according to the variation of kink density with supersaturation: for nearly constant density, decreasing or increasing supersaturation induce, respectively, growth promoting or inhibiting effects relative to equilibrium conditions. This is the type of GRH measured by us during the crystallization of egg-white lysozyme. For variable kink density, slight changes in the supersaturation level may induce abrupt variations in the crystal growth rate. Different literature examples of this so-called 'catastrophic' crystal growth are discussed in terms of their fundamental consequences.

Idioma: Inglês

Tipo (Avaliação Docente): Científica

Nº de páginas: 9