Understanding the stability behavior of colloidal silica in different alkali environments

IF 2.1 4区材料科学 Q3 CHEMISTRY, MULTIDISCIPLINARY Journal of Nanoparticle Research Pub Date : 2024-05-03 DOI:10.1007/s11051-024-05993-6

Yi Xing, Zhenyu Wu, Yaowen Li, Juntao Gong, Zhijie Zhang, Weili Liu, Zhitang Song

引用次数: 0

Abstract

This paper investigates the effect of three different alkalis, namely ammonia (NH₄OH), ethylenediamine (EDA), and tetrabutylammonium hydroxide (TBAOH) on the stability of colloidal silica, with pH controlled within the range of 8–11. As a result, NH₄OH greatly promotes the stability of silica sol at first due to the strong solvation ability of NH₄⁺ and then the stability begins to decrease because the electric double layer of silica is compressed. The addition of EDA into silica system leads to a reduction in the stability evidently followed by a slight increase, which can be explained by the cationic bridging effect of the ethylenediammonium cations. Meanwhile, the effect of TBAOH on silica dispersion is analogous to EDA, mainly caused by the hydrophobic and steric effects. The abovementioned relevant stability mechanisms are involved in non-DLVO theory.

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了解胶体二氧化硅在不同碱环境中的稳定性行为

本文研究了氨水（NH4OH）、乙二胺（EDA）和四丁基氢氧化铵（TBAOH）这三种不同碱对胶体二氧化硅稳定性的影响，pH值控制在8-11之间。结果表明，NH4OH 起初由于 NH4+ 的强溶解能力而大大提高了二氧化硅溶胶的稳定性，随后由于二氧化硅的电双层被压缩，稳定性开始下降。在二氧化硅体系中加入 EDA 后，稳定性明显下降，随后又略有上升，这可以解释为乙二铵阳离子的阳离子架桥效应。同时，TBAOH 对二氧化硅分散的影响与 EDA 类似，主要由疏水和立体效应引起。上述相关稳定性机理涉及非 DLVO 理论。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

Journal of Nanoparticle Research 工程技术-材料科学：综合

CiteScore

4.40

自引率

4.00%

发文量

198

审稿时长

3.9 months

期刊介绍： The objective of the Journal of Nanoparticle Research is to disseminate knowledge of the physical, chemical and biological phenomena and processes in structures that have at least one lengthscale ranging from molecular to approximately 100 nm (or submicron in some situations), and exhibit improved and novel properties that are a direct result of their small size. Nanoparticle research is a key component of nanoscience, nanoengineering and nanotechnology. The focus of the Journal is on the specific concepts, properties, phenomena, and processes related to particles, tubes, layers, macromolecules, clusters and other finite structures of the nanoscale size range. Synthesis, assembly, transport, reactivity, and stability of such structures are considered. Development of in-situ and ex-situ instrumentation for characterization of nanoparticles and their interfaces should be based on new principles for probing properties and phenomena not well understood at the nanometer scale. Modeling and simulation may include atom-based quantum mechanics; molecular dynamics; single-particle, multi-body and continuum based models; fractals; other methods suitable for modeling particle synthesis, assembling and interaction processes. Realization and application of systems, structures and devices with novel functions obtained via precursor nanoparticles is emphasized. Approaches may include gas-, liquid-, solid-, and vacuum-based processes, size reduction, chemical- and bio-self assembly. Contributions include utilization of nanoparticle systems for enhancing a phenomenon or process and particle assembling into hierarchical structures, as well as formulation and the administration of drugs. Synergistic approaches originating from different disciplines and technologies, and interaction between the research providers and users in this field, are encouraged.