Kinetics and thermodynamics of sucrose crystal growth in the presence of a non-ionic surfactant

• Type: Article in International Scientific Journal
• Date: 2010

Authors

Vasanth V Kumar (Author) Other; Rocha, F (Author) FEUP

Journal

Title: Surface Science

Vol. 604 No. 11

Pages: 981-987

ISSN: 0039-6028

Publisher: Elsevier

Indexing

ISI Web of Knowledge - 6 Citations

ISI Web of Science

Scopus - 9 Citations

Scientific classification

FOS: Natural sciences > Chemical sciences

Other information

Authenticus ID: P-003-5Q7

DOI: 10.1016/j.susc.2010.03.001

Abstract (EN): Batch experiments were carried out to study the effect of Hodag CB6, a non-ionic surfactant, on the growth kinetics of sucrose crystals as a function of supersaturation, impurity concentration and temperature. The growth promoting effect of the added impurity, studied using a recently introduced spiral nucleation model (SNM), was due to the decrease in the surface free energy induced by the added surfactant. The growth process was influenced by both kinetic and thermodynamic effect, the latter being predominant. The coverage of impurity molecules on the sucrose surface followed a Henry type expression according to Langmuir isotherm at studied temperatures. In the case of a pure system, the total active kink density was found to be around 10(16) kinks/m(2). The active growth sites on the crystal surface were found to be two orders of magnitude lower than the total number of sucrose molecules.

Language: English

Type (Professor's evaluation): Scientific

No. of pages: 7