Effects of base catalyst on the physicochemical properties and surface reactivity of silica nanoparticles

IF 4.9 2区 化学 Q2 CHEMISTRY, PHYSICAL Colloids and Surfaces A: Physicochemical and Engineering Aspects Pub Date : 2024-11-21 DOI:10.1016/j.colsurfa.2024.135783
Tsaone Gosiamemang , Robert V. Law , Jerry Y.Y. Heng
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Abstract

The surface reactivity of silica particles is a key property that enhances their versatility in various industries. Therefore, it is imperative to investigate the effects of different base catalysts on the surface reactivity of silica nanoparticles. Silica nanoparticles were synthesised using potassium hydroxide (KOH) and sodium hydroxide (NaOH) as strong base catalysts, as well as ammonia (NH3) and lysine amino acid as weak base catalysts. The particle size was observed to increase with the pH of the reaction mixture. Additionally, X-ray photoelectron spectroscopy (XPS) revealed that the catalyst molecules adsorb onto the particle surface, thereby enhancing their surface reactivity. Sodium and potassium ions were found to significantly improve surface reactivity during silanisation, with KOH- and NaOH-sil-C8 samples exhibiting high silane grafting density (> 2.58 alkyl chains/nm2). These findings indicate that the type of base catalyst plays a crucial role in tailoring the properties and surface reactivity of silica nanoparticles.
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碱催化剂对纳米二氧化硅理化性质和表面反应活性的影响
二氧化硅颗粒的表面活性是提高其在各行各业中通用性的关键特性。因此,研究不同碱催化剂对纳米二氧化硅颗粒表面活性的影响势在必行。以氢氧化钾(KOH)和氢氧化钠(NaOH)为强碱催化剂,以氨水(NH3)和赖氨酸为弱碱催化剂合成了纳米二氧化硅颗粒。据观察,粒径随反应混合物的 pH 值增大而增大。此外,X 射线光电子能谱(XPS)显示,催化剂分子吸附在颗粒表面,从而增强了其表面反应活性。在硅烷化过程中,钠离子和钾离子可显著提高表面反应速度,KOH- 和 NaOH-Sil-C8 样品表现出较高的硅烷接枝密度(2.58 烷基链/nm2)。这些研究结果表明,碱催化剂的类型在定制纳米二氧化硅颗粒的特性和表面反应活性方面起着至关重要的作用。
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来源期刊
CiteScore
8.70
自引率
9.60%
发文量
2421
审稿时长
56 days
期刊介绍: Colloids and Surfaces A: Physicochemical and Engineering Aspects is an international journal devoted to the science underlying applications of colloids and interfacial phenomena. The journal aims at publishing high quality research papers featuring new materials or new insights into the role of colloid and interface science in (for example) food, energy, minerals processing, pharmaceuticals or the environment.
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