Migliozzi, S;
Angeli, P;
Mazzei, L;
(2019)
Gelation kinetics of non-aqueous Carbopol dispersions.
Colloids and Surfaces A: Physicochemical and Engineering Aspects
, 577
pp. 84-95.
10.1016/j.colsurfa.2019.05.051.
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Abstract
The time evolution of the gelation process of non-aqueous Carbopol dispersions in PEG and glycerol was studied experimentally by tracking the evolving viscoelastic properties of the material by means of Fourier Transform Mechanical Spectroscopy (FTMS). A structural conversion degree related to the storage modulus was defined and a kinetic expression to describe its evolution was developed. UV–vis spectroscopy was employed to confirm the mechanism of gelation. It was found that an increase in both the concentration of glycerol and the gelation temperature increased the gelation rate. These trends seem to indicate a diffusion-controlled mechanism of the process, in which the solvent molecules penetrate the cross-linked structure of Carbopol particles, causing their uncoiling and subsequent swelling. Lastly, the kinetic relation found for the structural conversion degree was used to obtain conversion maps, which can be employed as a first guidance to design new continuous gelation formulation processes.
| Type: | Article |
|---|---|
| Title: | Gelation kinetics of non-aqueous Carbopol dispersions |
| Open access status: | An open access version is available from UCL Discovery |
| DOI: | 10.1016/j.colsurfa.2019.05.051 |
| Publisher version: | https://doi.org/10.1016/j.colsurfa.2019.05.051 |
| Language: | English |
| Additional information: | This version is the author accepted manuscript. For information on re-use, please refer to the publisher’s terms and conditions. |
| Keywords: | Time-resolved rheometry, Gelation kinetics, Carbopol gels, UV-vis spectroscopy |
| UCL classification: | UCL UCL > Provost and Vice Provost Offices UCL > Provost and Vice Provost Offices > UCL BEAMS UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Engineering Science UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Engineering Science > Dept of Chemical Engineering |
| URI: | https://discovery.ucl.ac.uk/id/eprint/10075167 |
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