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Article

Effect of D-Mannitol on the Microstructure and Rheology of Non-Aqueous Carbopol Microgels

Department of Chemical Engineering, University College London, Torrington Place, London WC1E 7JE, UK
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Academic Editor: Yannis Dimakopoulos
Materials 2021, 14(7), 1782; https://doi.org/10.3390/ma14071782
Received: 17 March 2021 / Revised: 31 March 2021 / Accepted: 1 April 2021 / Published: 4 April 2021
(This article belongs to the Special Issue Rheology of Advanced Complex Fluids)
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. View Full-Text
Keywords: carbopol; microgels; nonlinear rheology, LAOS; yield stress; structure-rheology relationship; mannitol; fluorescence microscopy; non-aqueous formulations carbopol; microgels; nonlinear rheology, LAOS; yield stress; structure-rheology relationship; mannitol; fluorescence microscopy; non-aqueous formulations
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MDPI and ACS Style

Migliozzi, S.; Angeli, P.; Mazzei, L. Effect of D-Mannitol on the Microstructure and Rheology of Non-Aqueous Carbopol Microgels. Materials 2021, 14, 1782. https://doi.org/10.3390/ma14071782

AMA Style

Migliozzi S, Angeli P, Mazzei L. Effect of D-Mannitol on the Microstructure and Rheology of Non-Aqueous Carbopol Microgels. Materials. 2021; 14(7):1782. https://doi.org/10.3390/ma14071782

Chicago/Turabian Style

Migliozzi, Simona, Panagiota Angeli, and Luca Mazzei. 2021. "Effect of D-Mannitol on the Microstructure and Rheology of Non-Aqueous Carbopol Microgels" Materials 14, no. 7: 1782. https://doi.org/10.3390/ma14071782

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