无机盐KCl对离子型表面活性剂泡沫演化规律研究

doi:10.3969/j.issn.2097-2806.2023.07.001

摘要/Abstract

摘要：

泡沫广泛应用在很多的领域，比如食品、化妆品、医药和矿物浮选等方面。无机盐加入到离子型表面活性剂中会影响其在气-液界面的吸附及在溶液中的溶解度，由此会对泡沫的演化过程产生影响，目前无机盐对离子型表面活性剂泡沫演化规律的影响还不清楚。本文系统的研究了在偏低浓度范围内无机盐氯化钾对阴离子表面活性剂十二烷基硫酸钠（SDS）泡沫演化过程的影响，发现当盐和表面活性剂浓度均较小时，所制备的泡沫稳定性与未加盐时类似，为表面活性剂分子稳定的泡沫；随着二者浓度的增大且数值相差不大时，加入的盐离子由于静电作用促进了表面活性剂分子在气-液界面的吸附和结晶，使得泡沫的稳定性比纯表面活性剂泡沫更好，为无机盐增强表面活性剂分子稳定的泡沫；当盐浓度稍微高于表面活性剂浓度时，表面活性剂晶体颗粒吸附在网络状的泡沫上，由于局部晶体破坏了气泡液膜的连续性使得制备的泡沫不稳定，为表面活性剂晶体干扰下表面活性剂分子稳定的泡沫；随着盐浓度继续升高，表面活性剂晶体颗粒完全覆盖在泡沫气-液界面上，通过形成固体颗粒屏障获得超稳定的Pickering泡沫。本论文的研究对进一步探索表面活性剂晶体粒子稳定的泡沫演化理论及其在相关领域的应用具有重要的理论指导意义。

关键词: 盐效应, 十二烷基硫酸钠, 泡沫演化, 表面活性剂晶体

Abstract:

Foams are widely used in many fields, such as food, cosmetics, medicine, and mineral flotation. The addition of inorganic salts to ionic surfactants will affect the adsorption of surfactants at the air-liquid interface and the solubility of surfactants in solution, thus influencing the evolution of foams. At present, the influences of salts on the evolution of foams of ionic surfactants are still not clear. In this work, the influence of potassium chloride （KCl） on the evolution of foam of sodium dodecyl sulfate （SDS） in the low concentration range was systematically studied. It was found that, when the concentrations of salt and surfactant were both low, the stability of the foam prepared was similar to that without salt, in which the foam was stabilized by surfactant molecules; when the concentrations of salt and surfactant were both increased and their concentrations were close to each other, the salt promoted the adsorption and crystallization of surfactant molecules at the air-liquid interface due to electrostatic interaction, making the stability of foam better than that of pure surfactant, in which the foam was stabilized by inorganic-salt enhanced surfactant molecules; when the salt concentration was slightly higher than the surfactant concentration, the surfactant crystal particles adsorbed on the network of foam, and the local crystals destroyed the liquid film of foam, thus making the foam unstable, in which the foam was stabilized by surfactant molecules under the interference of surfactant crystals; when the salt concentration was further increased, the surfactant crystal particles completely covered on the air-liquid interface of foam, and ultra-stable Pickering foam was obtained by forming solid particle barrier. This research work might have important theoretical guiding significance for further exploring the evolution theory of foams stabilized by surfactant crystal particles and their applications in related fields.

Key words: salt effect, SDS, foam evolution, surfactant crystal

中图分类号:

TQ423

强学峰, 张莉, 郑斌, 侯倩倩, 燕坤. 无机盐KCl对离子型表面活性剂泡沫演化规律研究[J]. 日用化学工业（中英文）, 2023, 53(7): 733-741.

Qiang Xuefeng, Zhang Li, Zheng Bin, Hou Qianqian, Yan Kun. Study on the inf luence of KCl on the evolution of foam of an anionic surfactant[J]. China Surfactant Detergent & Cosmetics, 2023, 53(7): 733-741.

图/表 8

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