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

• Tipo: Artigo em Revista Científica Internacional
• Data: 2010

Autores

Vasanth V Kumar (Autor) Outra; Rocha, F (Autor) FEUP

Revista

Título: Surface Science

Vol. 604 Nº 11

Páginas: 981-987

ISSN: 0039-6028

Editora: Elsevier

Indexação

ISI Web of Knowledge - 6 Citações

ISI Web of Science

Scopus - 9 Citações

Classificação Científica

FOS: Ciências exactas e naturais > Química

Outras Informações

ID Authenticus: 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.

Idioma: Inglês

Tipo (Avaliação Docente): Científica

Nº de páginas: 7