Sheng Youjie, Zhang Hanling, Ma Li, Wang Zhenping, Hu Die, Zhang Shanwen
College of Safety Science and Engineering, Xi'an University of Science and Technology, Xi'an 710054, China.
Gels. 2023 Jun 30;9(7):534. doi: 10.3390/gels9070534.
Gel foam has the advantages of gel and foam and shows good prospects for applications in the fields of fire prevention and extinguishing. Rheology has a significant impact on the application of gel foam, but there is little related research. In the present study, hydrophilic silica nanoparticles (NPs) and water-soluble polymer xanthan gum (XG) were combined with fluorocarbon surfactant (FS-50) and hydrocarbon surfactant (APG0810) to create gel foam. The foaming ability and foam drainage were evaluated. The gel foam's rheology, including its flow behavior and viscoelasticity, was systematically investigated. The results show that the foaming of the FS-50/APG0810 mixture decreases but the foam drainage increases in the presence of NPs and/or XG. All of the foams belong to the category of non-Newtonian fluids with shear thinning behavior. The flow curves of the foams are consistent with the Cross model. The presence of XG/NPs enhanced the foam viscoelasticity of the FS-50/APG0810 mixture. The silica NPs showed a better ability to enhance foam viscoelasticity but a worse ability to stabilize the foam compared to XG. This research can offer theoretical support for the industrial usage of gel foam.
凝胶泡沫兼具凝胶和泡沫的优点，在防火灭火领域展现出良好的应用前景。流变学对凝胶泡沫的应用有重大影响，但相关研究较少。在本研究中，将亲水性二氧化硅纳米颗粒（NPs）和水溶性聚合物黄原胶（XG）与碳氟表面活性剂（FS - 50）和碳氢表面活性剂（APG0810）相结合来制备凝胶泡沫。对其发泡能力和泡沫析液进行了评估。系统研究了凝胶泡沫的流变学，包括其流动行为和粘弹性。结果表明，在存在NPs和/或XG的情况下，FS - 50/APG0810混合物的发泡能力降低，但泡沫析液增加。所有泡沫均属于具有剪切变稀行为的非牛顿流体类别。泡沫的流动曲线与Cross模型一致。XG/NPs的存在增强了FS - 50/APG0810混合物的泡沫粘弹性。与XG相比，二氧化硅NPs增强泡沫粘弹性的能力更好，但稳定泡沫的能力较差。本研究可为凝胶泡沫的工业应用提供理论支持。
