Migliozzi, S;
Angeli, P;
Mazzei, L;
(2021)
Effect of D-Mannitol on the Microstructure and Rheology of Non-Aqueous Carbopol Microgels.
Materials
, 14
(7)
, Article 1782. 10.3390/ma14071782.
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Abstract
D-mannitol is a common polyol that is used as additive in pharmaceutical and personal care product formulations. We investigated its effect on the microstructure and rheology of novel non-aqueous Carbopol dispersions employing traditional and time-resolved rheological analysis. We considered two types of sample, (i) fresh (i.e., mannitol completely dissolved in solution) and aged (i.e., visible in crystalline form). The analysis of the intracycle rheological transitions that were observed for different samples revealed that, when completely dissolved in solution, mannitol does not alter the rheological behaviour of the Carbopol dispersions. This highlights that the chemical similarity of the additive with the molecules of the surrounding solvent allows preserving the swollen dimension and interparticle interactions of the Carbopol molecules. Conversely, when crystals are present, a hierarchical structure forms, consisting of a small dispersed phase (Carbopol) agglomerated around a big dispersed phase (crystals). In keeping with this microstructural picture, as the concentration of Carbopol reduces, the local dynamics of the crystals gradually start to control the integrity of the microstructure. Rheologically, this results in a higher elasticity of the suspensions at infinitesimal deformations, but a fragile yielding process at intermediate strains.
| Type: | Article |
|---|---|
| Title: | Effect of D-Mannitol on the Microstructure and Rheology of Non-Aqueous Carbopol Microgels |
| Open access status: | An open access version is available from UCL Discovery |
| DOI: | 10.3390/ma14071782 |
| Publisher version: | https://doi.org/10.3390/ma14071782 |
| Language: | English |
| Additional information: | This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited |
| Keywords: | Carbopol, Microgels, Nonlinear rheology, LAOS, Yield stress, Structure-rheology relationship, Mannitol, Fluorescence microscopy, Non-aqueous formulations |
| UCL classification: | UCL 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/10125579 |
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