The Role of the Hydrate Layer in Nanobubble Stability

IF 1.1 4区 化学 Q4 CHEMISTRY, PHYSICAL
Yu. K. Levin
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引用次数: 0

Abstract

The article considers factors determining the stability of a nanobubble with a hydrate layer having a thickness of 1 nm and a dielectric permittivity of about 3. Two stability hypotheses are compared, namely, electrostatic and mechanical (ice-effect or “electrofreezing”). In the first case, the Laplace pressure is compensated by the electrostatic pressure at the bubble boundary; in the second case, it is compensated by the effect of the electrofreezing of its Δ-layer in a high electric field. It is shown that, in salt-free water, a lower nanobubble charge is required for the formation of an ice shell than in the case of the Coulomb stabilization mechanism. In seawater, the Coulomb mechanism is, on the contrary, more efficient, because icing is counteracted by dissolved salt ions. The sizes and charges of the nanobubble are determined for both stability mechanisms.

Abstract Image

Abstract Image

水合物层在纳米泡稳定性中的作用
本文考虑了决定水合物层厚度为1nm,介电常数约为3的纳米气泡稳定性的因素。比较了两种稳定性假设,即静电和机械(冰效应或“电冻结”)。在第一种情况下,拉普拉斯压力由气泡边界处的静电压力补偿;在第二种情况下,它由其Δ-layer在高电场中的电冻结效应来补偿。结果表明,与库仑稳定机制相比,在无盐水中,形成冰壳所需的纳米泡电荷更低。相反,在海水中,库仑机制更有效,因为冰被溶解的盐离子抵消了。两种稳定机制决定了纳米气泡的大小和电荷。
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来源期刊
Colloid Journal
Colloid Journal 化学-物理化学
CiteScore
2.20
自引率
18.20%
发文量
36
审稿时长
6-12 weeks
期刊介绍: Colloid Journal (Kolloidnyi Zhurnal) is the only journal in Russia that publishes the results of research in the area of chemical science dealing with the disperse state of matter and surface phenomena in disperse systems. The journal covers experimental and theoretical works on a great variety of colloid and surface phenomena: the structure and properties of interfaces; adsorption phenomena and structure of adsorption layers of surfactants; capillary phenomena; wetting films; wetting and spreading; and detergency. The formation of colloid systems, their molecular-kinetic and optical properties, surface forces, interaction of colloidal particles, stabilization, and criteria of stability loss of different disperse systems (lyosols and aerosols, suspensions, emulsions, foams, and micellar systems) are also topics of the journal. Colloid Journal also includes the phenomena of electro- and diffusiophoresis, electro- and thermoosmosis, and capillary and reverse osmosis, i.e., phenomena dealing with the existence of diffusion layers of molecules and ions in the vicinity of the interface.
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