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Switchable hydrophilicity solvents (SHSs) are solvents defined by theirability to switch from their hydrophobic form to a hydrophilic form when put incontact with an acidic trigger such as $CO_2$. As a consequence, SHSs qualifyas promising alternatives to volatile organic compounds during the industrialsolvent extraction processes, as greener and inexpensive methods can be appliedto separate and recover SHSs. Furthermore, because of their less volatilenature, SHSs are less flammable and so increase the safety of a larger-scaleextraction process. In this work, we study the dynamics and in-drop phaseseparation during the dissolution process of a drop composed of SHS andpolymer, triggered by an acid in the surrounding aqueous environment. From 70different experimental conditions, we found a scaling relationship between thedrop dissolution time and initial volume with an overall scaling coefficient$\sim$ 0.53. We quantitatively assessed and found a shorter dissolution timerelated with a decrease in pH of the aqueous phase or an increase in initialpolymer concentration in the drop. Examining the internal state of the dropduring the dissolution revealed an in-drop phase separation behavior, resultingin a porous morphology of the final polymer particle. Our experimental resultsprovide a microscopic view of the SHS dissolution process from droplets, andfindings may help design SHS extraction processes for particle formation fromemulsions.

Dissolution Dynamics of a Binary Switchable Hydrophilicty Solvent -- Polymer Drop into an Acidic Aqueous Phase