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One-Step Generation of Alginate-Based Hydrogel Foams Using $CO_{2}$ for Simultaneous Foaming and Gelation
| Content Provider | MDPI |
|---|---|
| Author | Djemaa, Imene Ben Andrieux, Sébastien Auguste, Stéphane Jacomine, Leandro Tarnowska, Malgorzata Drenckhan-Andreatta, Wiebke |
| Copyright Year | 2022 |
| Description | The reliable generation of hydrogel foams remains a challenge in a wide range of sectors, including food, cosmetic, agricultural, and medical applications. Using the example of calcium alginate foams, we introduce a novel foam generation method that uses $CO_{2}$ for the simultaneous foaming and pH reduction of the alginate solution to trigger gelation. We show that gelled foams of different gas fractions can be generated in a simple one-step process. We macroscopically follow the acidification using a pH-responsive indicator and investigate the role of $CO_{2}$ in foam ageing via foam stability measurements. Finally, we demonstrate the utility of interfacial rheology to provide evidence for the gelation process initiated by the dissolution of the $CO_{2}$ from the dispersed phase. Both approaches, gas-initiated gelation and interfacial rheology for its characterization, can be readily transferred to other types of gases and formulations. |
| Starting Page | 444 |
| e-ISSN | 23102861 |
| DOI | 10.3390/gels8070444 |
| Journal | Gels |
| Issue Number | 7 |
| Volume Number | 8 |
| Language | English |
| Publisher | MDPI |
| Publisher Date | 2022-07-16 |
| Access Restriction | Open |
| Subject Keyword | Gels Hydrogel Foams Liquid Foam Templating Alginate Hydrogels Gas-initiated Cross-linking Interfacial Rheology |
| Content Type | Text |
| Resource Type | Article |
