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

• Type: Article in International Scientific Journal
• Date: 2012

Authors

Issam Khaddour (Author) Other; António Ferreira (Author) FEUP; Luís Bento (Author) Other; Fernando Rocha (Author) FEUP

Journal

Title: Journal of Crystal Growth

Vol. 355

Pages: 17-25

ISSN: 0022-0248

Publisher: Elsevier

Indexing

ISI Web of Knowledge - 6 Citations

ISI Web of Science

Scopus - 8 Citations

INSPEC

Scientific classification

FOS: Engineering and technology > Materials engineering

Associated Projects

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

Other information

Authenticus ID: 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.

Language: English

Type (Professor's evaluation): Scientific

No. of pages: 9