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Posts Taged colloidal-stability

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Practical Sessions in the Master of Cosmetic and Dermopharmacy by NANBIOSIS U12

The researchers of NANBIOSIS U12, Nanostructured liquid characterization unit of CIBR-BBN and IQAC-CSIC, will participate in teaching and training students of the Master en Cosmética y Dermofarmacia, organized by Centro de Estudios Superiores de la Industria Farmacéutica (CESIF), from 17 May to 16 June 2021.

Cosmetic manufacturing companies are committed to innovation, both in technological development and in the use of components in their formulations, adapting to new trends and user needs. Determination of colloidal stability, surface tension, particle size and rheological behaviour, among many others properties, is essential for the proper characterization and understanding the performance of cosmetic products. Attendees participate in practical sessions in which they can learn advanced experimental techniques and methodologies of great interest in the cosmetic industry

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Elastic and adhesion properties of adsorbed hydrophobically modified inulin films on latex particles using Atomic Force Microscopy (AFM)

In a study published in the journal Colloids and Surfaces A: Physicochemical and Engineering Aspects, by Jordi Esquena, Coordinator of Unit 12 of NANBIOSIS, among others, it has been shown that the latex particles dispersed with graft-type polymeric surfactants have excellent colloidal stability, which is attributed to the repulsion forces between the particles, which arise from the presence of adsorbed surfactant molecules. These forces of repulsion have been studied by means of Atomic Force Microscopy (AFM), between an AFM tip and a latex particle, with the presence of surfactant adsorbed on both. It has been observed that this repulsion is maintained even at high concentrations of electrolyte, which has been attributed to the high hydration of the surfactant.

The results have allowed to explain the stabilization mechanism, being of great importance in systems where the control of the colloidal stability is a fundamental requirement.

 

Article of reference

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