New developments on size-dependent growth applied to the crystallization of sucrose

• Tipo: Artigo em Revista Científica Internacional
• Data: 2007

Autores

Martins, PM (Autor) FEUP; Rocha, F (Autor) FEUP

Revista

Título: Surface Science

Vol. 601 Nº 23

Páginas: 5466-5472

ISSN: 0039-6028

Editora: Elsevier

Indexação

ISI Web of Knowledge - 6 Citações

ISI Web of Science

Scopus - 8 Citações

Classificação Científica

CORDIS: Ciências Tecnológicas > Engenharia > Engenharia química

FOS: Ciências exactas e naturais > Química

Outras Informações

ID Authenticus: P-004-66Z

DOI: 10.1016/j.susc.2007.09.008

Abstract (EN): The effect of crystal size on the growth rate of sucrose (C12H22O11) at 40 degrees C is investigated from a theoretical and an experimental point of view. Based on new perspectives resulting from the recently introduced spiral nucleation model [P.M. Martins, F. Rocha, Surf. Sci. 601 (2007) 3400], crystal growth rates are expressed in terms of mass deposition per time and crystal volume units. This alternative definition is demonstrated to be size-independent over the considered supersaturation range. The conventional overall growth rate expressed per surface area units is found to be linearly dependent on crystal size. The advantages of the "volumetric" growth rate concept are discussed. Sucrose dissolution rates were measured under reciprocal conditions of the growth experiments in order to investigate the two-way effect of crystal size on mass transfer rates and on the integration kinetics. Both effects are adequately described by combining a well-established diffusion-integration model and the spiral nucleation mechanism.

Idioma: Inglês

Tipo (Avaliação Docente): Científica

Nº de páginas: 7