Oil resistivity of fluorine-free foams stabilized by silica nanoparticles and mixture of silicone and hydrocarbon surfactants

IF 2.3 4区 材料科学 Q2 MATERIALS SCIENCE, CERAMICS Journal of Sol-Gel Science and Technology Pub Date : 2024-08-09 DOI:10.1007/s10971-024-06503-9
Youjie Sheng, Die Hu, Wenzhi Ma, Qian Zhao
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Abstract

This study aims at exploring properties of fluorine-free foams co-stabilized by nanoparticles (NPs) and surfactant. The mixed dispersion liquids composed of silica NPs, nonionic hydrocarbon surfactant (APG-0810), and organosilicon surfactant (CoatOsil-77) was prepared. The NP-intensified foams under the action of n-heptane (flammable liquid) were focused by analyzing aggregation behavior of surfactants, initial foaming height, foams drainage and decay, and single vertical film stability of the mixed dispersion liquids. The findings show that the presence of surfactants improves surface activity of water obviously. After adding NPs, the interactions between surfactant molecules are destroyed but new aggregates formed. Foaming ability decreases but stability increases significantly with increasing NP concentration. After n-heptane is added, intensified interactions exist among surfactant molecules, NPs, and oil droplet, promoting formation of some larger aggregates and increasing the surface tension and viscosity but decreasing the conductivity and foaming ability. In addition, the presence of n-heptane accelerates foam drainage and volume decay and thinning process of the vertical liquid film. NPs with an appropriate concentration can improve foaming ability, foam stability, and the corresponding oil resistivity of foam. This study can provide theoretical guidance for the development of new fluorine-free foams used for liquid fuel fire.

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用纳米二氧化硅颗粒及有机硅和碳氢化合物表面活性剂混合物稳定的无氟泡沫的耐油性能
本研究旨在探索由纳米粒子(NPs)和表面活性剂共同稳定的无氟泡沫的特性。该研究制备了由二氧化硅 NPs、非离子烃类表面活性剂(APG-0810)和有机硅表面活性剂(CoatOsil-77)组成的混合分散液。通过分析混合分散液的表面活性剂聚集行为、初始发泡高度、泡沫排泄和衰减以及单垂直膜稳定性,重点研究了正庚烷(易燃液体)作用下的 NP 强化泡沫。研究结果表明,表面活性剂的存在明显提高了水的表面活性。添加 NPs 后,表面活性剂分子间的相互作用被破坏,但形成了新的聚集体。随着 NP 浓度的增加,起泡能力降低,但稳定性显著提高。加入正庚烷后,表面活性剂分子、NPs 和油滴之间的相互作用增强,促进形成一些较大的聚集体,表面张力和粘度增加,但传导性和起泡能力降低。此外,正庚烷的存在会加速泡沫排出和垂直液膜的体积衰减和变薄过程。适当浓度的 NPs 可提高泡沫的发泡能力、泡沫稳定性和相应的泡沫耐油性。这项研究可为开发用于液体燃料火灾的新型无氟泡沫提供理论指导。
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来源期刊
Journal of Sol-Gel Science and Technology
Journal of Sol-Gel Science and Technology 工程技术-材料科学:硅酸盐
CiteScore
4.70
自引率
4.00%
发文量
280
审稿时长
2.1 months
期刊介绍: The primary objective of the Journal of Sol-Gel Science and Technology (JSST), the official journal of the International Sol-Gel Society, is to provide an international forum for the dissemination of scientific, technological, and general knowledge about materials processed by chemical nanotechnologies known as the "sol-gel" process. The materials of interest include gels, gel-derived glasses, ceramics in form of nano- and micro-powders, bulk, fibres, thin films and coatings as well as more recent materials such as hybrid organic-inorganic materials and composites. Such materials exhibit a wide range of optical, electronic, magnetic, chemical, environmental, and biomedical properties and functionalities. Methods for producing sol-gel-derived materials and the industrial uses of these materials are also of great interest.
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