Roughness effect on the overall growth rate of sucrose crystals

• Type: Article in International Scientific Journal
• Date: 2008

Authors

Ferreira, A (Author) FEUP; Faria, N (Author) Other; Rocha, F (Author) FEUP

Journal

Title: Journal of Crystal Growth

Vol. 310 No. 2

Pages: 442-451

ISSN: 0022-0248

Publisher: Elsevier

Indexing

ISI Web of Knowledge - 8 Citations

Scopus - 8 Citations

COMPENDEX

INSPEC

Scientific classification

CORDIS: Technological sciences > Engineering > Chemical engineering

FOS: Engineering and technology > Materials engineering

Other information

Authenticus ID: P-004-21V

DOI: 10.1016/j.jcrysgro.2007.11.031

Abstract (EN): The roughness effect on crystal growth rate was investigated at 35 degrees C in a fluidized bed crystallizer and in a batch crystallizer. The crystallization of sucrose in pure aqueous solutions was the study subject. The results show that the sucrose crystals exhibit time-dependent growth rate. The overall growth rate decreased continually with time until a constant value was reached, that corresponds to a decrease of 40% considering the experiments of 13 and 63 min duration in the fluidized bed crystallizer. The decrease of the growth rates with the contact time between crystals and supersaturated solution was interpreted in terms of the increase of surfaces' roughness. According to SEM micrographs, the surface roughness increases significantly with residence time and supersaturation. The roughness appears to be the result of faulty integration of growth clusters in the crystal surface. The batch experiments show that the surface roughness acts like a strong impurity. The results were interpreted according to the Kubota-Mullin model.

Language: English

Type (Professor's evaluation): Scientific

No. of pages: 10