Modeling Chemical Reactivity at the Interfaces of Emulsions: Effects of Partitioning and Temperature

• Type: Another Publication in an International Scientific Journal
• Date: 2021

Authors

Costa, M (Author) Other; Fatima Paiva Martins (Author) FCUP; Losada Barreiro, S (Author) Other; Bravo Diaz, C (Author) Other

Journal

Title: Molecules

Vol. 10

Final page: 4703

ISSN: 1420-3049

Publisher: MDPI

Indexing

ISI Web of Knowledge - 3 Citations

Other information

Authenticus ID: P-00V-939

DOI: 10.3390/molecules26154703

Abstract (EN): Bulk phase chemistry is hardly ever a reasonable approximation to interpret chemical reactivity in compartmentalized systems, because multiphasic systems may alter the course of chemical reactions by modifying the local concentrations and orientations of reactants and by modifying their physical properties (acid-base equilibria, redox potentials, etc.), making them-or inducing them-to react in a selective manner. Exploiting multiphasic systems as beneficial reaction media requires an understanding of their effects on chemical reactivity. Chemical reactions in multiphasic systems follow the same laws as in bulk solution, and the measured or observed rate constant of bimolecular reactions can be expressed, under dynamic equilibrium conditions, in terms of the product of the rate constant and of the concentrations of reactants. In emulsions, reactants distribute between the oil, water, and interfacial regions according to their polarity. However, determining the distributions of reactive components in intact emulsions is arduous because it is physically impossible to separate the interfacial region from the oil and aqueous ones without disrupting the existing equilibria and, therefore, need to be determined in the intact emulsions. The challenge is, thus, to develop models to correctly interpret chemical reactivity. Here, we will review the application of the pseudophase kinetic model to emulsions, which allows us to model chemical reactivity under a variety of experimental conditions and, by carrying out an appropriate kinetic analysis, will provide important kineticparameters.

Language: English

Type (Professor's evaluation): Scientific

No. of pages: 25