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

• Type: Article in International Scientific Journal
• Date: 2007

Authors

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

Journal

Title: Surface Science

Vol. 601 No. 23

Pages: 5466-5472

ISSN: 0039-6028

Publisher: Elsevier

Indexing

ISI Web of Knowledge - 6 Citations

ISI Web of Science

Scopus - 8 Citations

Scientific classification

CORDIS: Technological sciences > Engineering > Chemical engineering

FOS: Natural sciences > Chemical sciences

Other information

Authenticus ID: 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.

Language: English

Type (Professor's evaluation): Scientific

No. of pages: 7