New Concepts of Colloid Chemistry: Nano-Adsorbent as a Solvent Component and Adsorption Protomicelle

IF 16.4 1区 化学 Q1 CHEMISTRY, MULTIDISCIPLINARY
A. I. Rusanov, T. G. Movchan, E. V. Plotnikova
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Abstract

Large molecules of dyes or other substances can act as nano-adsorbents in aqueous surfactant solutions and, being coated with surfactant molecules, they resemble surfactant micelles with a solubilizate. These micelle-like particles were called protomicelles (or, more precisely, adsorption protomicelles, as in this paper). Their formation does not require a critical micelle concentration (CMC) and begins immediately when a surfactant is added to a solution. In this spectrophotometric study of Nile red (NR) in aqueous solutions of nonanoic acid (NOA), the first case where protomicelles were more important than micelles was demonstrated. It was shown that NR solubilization in both premicellar and micellar solutions proceeds through protomicelles rather than through NOA micelles. In the theoretical part of the paper, on the basis of the chemical potential of the nano-adsorbent, it was proved that the addition of a surfactant to a solution always increases the solubility of the nano-adsorbent. The dependence of adsorption on the curvature of the nano-adsorbent surface was considered, and it was shown that the adsorption equations for flat surfaces are applicable to curved surfaces with high accuracy.

Abstract Image

Abstract Image

胶体化学新概念:作为溶剂成分和吸附原核的纳米吸附剂
摘要 大分子染料或其他物质可在表面活性剂水溶液中充当纳米吸附剂,在表面活性剂分子的包覆下,它们类似于表面活性剂胶束与增溶剂。这些胶束状颗粒被称为原胶束(或更准确地说是吸附原胶束,如本文所述)。它们的形成不需要临界胶束浓度(CMC),在溶液中加入表面活性剂后立即开始形成。在对壬酸(NOA)水溶液中的尼罗红(NR)进行的分光光度法研究中,首次证明了原胶束比胶束更重要。研究表明,尼罗红在前胶束和胶束溶液中的溶解都是通过原胶束而不是壬酸胶束进行的。在论文的理论部分,根据纳米吸附剂的化学势,证明了在溶液中添加表面活性剂总是会增加纳米吸附剂的溶解度。研究还考虑了吸附力与纳米吸附剂表面曲率的关系,结果表明,平面的吸附方程适用于曲面,而且精度很高。
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来源期刊
Accounts of Chemical Research
Accounts of Chemical Research 化学-化学综合
CiteScore
31.40
自引率
1.10%
发文量
312
审稿时长
2 months
期刊介绍: Accounts of Chemical Research presents short, concise and critical articles offering easy-to-read overviews of basic research and applications in all areas of chemistry and biochemistry. These short reviews focus on research from the author’s own laboratory and are designed to teach the reader about a research project. In addition, Accounts of Chemical Research publishes commentaries that give an informed opinion on a current research problem. Special Issues online are devoted to a single topic of unusual activity and significance. Accounts of Chemical Research replaces the traditional article abstract with an article "Conspectus." These entries synopsize the research affording the reader a closer look at the content and significance of an article. Through this provision of a more detailed description of the article contents, the Conspectus enhances the article's discoverability by search engines and the exposure for the research.
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