Ben Djemaa Imene, Andrieux Sébastien, Auguste Stéphane, Jacomine Leandro, Tarnowska Malgorzata, Drenckhan-Andreatta Wiebke
Institut Charles Sadron, CNRS UPR22-University of Strasbourg, 67084 Cedex 2 Strasbourg, France.
Urgo Research Innovation and Development, 21300 Cedex Chenôve, France.
Gels. 2022 Jul 16;8(7):444. doi: 10.3390/gels8070444.
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 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 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 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.
在包括食品、化妆品、农业和医疗应用在内的广泛领域中，可靠地制备水凝胶泡沫仍然是一项挑战。以海藻酸钙泡沫为例，我们介绍了一种新颖的泡沫生成方法，该方法利用二氧化碳同时对海藻酸盐溶液进行发泡和降低pH值以引发凝胶化。我们表明，可以通过简单的一步法生成不同气体分数的凝胶泡沫。我们使用pH响应指示剂宏观跟踪酸化过程，并通过泡沫稳定性测量研究二氧化碳在泡沫老化中的作用。最后，我们证明了界面流变学的效用，为从分散相中溶解二氧化碳引发的凝胶化过程提供证据。气体引发的凝胶化及其表征的界面流变学这两种方法都可以很容易地转移到其他类型的气体和配方中。
