Sucrose crystal growth in the presence of dextran of different molecular weights

• Tipo: Artigo em Revista Científica Internacional
• Data: 2012

Autores

Issam Khaddour (Autor) Outra; António Ferreira (Autor) FEUP; Luís Bento (Autor) Outra; Fernando Rocha (Autor) FEUP

Revista

Título: Journal of Crystal Growth

Vol. 355

Páginas: 17-25

ISSN: 0022-0248

Editora: Elsevier

Indexação

ISI Web of Knowledge - 6 Citações

ISI Web of Science

Scopus - 8 Citações

INSPEC

Classificação Científica

FOS: Ciências da engenharia e tecnologias > Engenharia dos materiais

Projetos Associados

PEst-C/EQB/UI0511/2011 - PROJECTO ESTRATÉGICO - UI 511 - 2011-2012

Outras Informações

ID Authenticus: P-002-5FT

DOI: 10.1016/j.jcrysgro.2012.05.039

Abstract (EN): The effects of variable concentrations of different molecular weight fractions of dextran on the interfacial free energies and the kinetic coefficients of the overall linear growth rates of the sucrose crystal were evaluated at 40 and 50 degrees C. Dextrans-reducing effects on the interfacial free energy increased the overall linear growth rates of sucrose at 40 degrees C. Further, dextrans-reducing effects of the growth kinetic coefficients resulted in lower growth rates of the sucrose crystals at 50 degrees C. Impurity effectiveness factor, differential heat of adsorption and Langmuir isotherm constant were determined, for the used dextrans, at 50 degrees C and relative supersaturation of 0.161. The dextran of molecular fraction of 2000 kilo Daltons (kDa) showed considerably high effectiveness factor in comparison with the dextrans of molecular fractions of 70 and 250 kDa. Role of dextran in retarding the advancement of the growth steps in the vicinity of its incorporation on the face (100) of the sucrose crystal is pointed out using AFM technique.

Idioma: Inglês

Tipo (Avaliação Docente): Científica

Nº de páginas: 9