Unveiling Enhanced Electrostatic Repulsion in Silica Nanosphere Assembly: Formation Dynamics of Body-Centered-Cubic Colloidal Crystals

Fan, Qingsong; Li, Zhiwei; Li, Yichen; Gao, Aiqin; Zhao, Yuzhi; Yang, Daniel; Zhu, Chenhui; Brinzari, Tatiana V.; Xu, Guofeng; Pan, Long; Vuong, Luat T.; Yin, Yadong

doi:10.1021/jacs.3c10817

Cited by 7 publications

(1 citation statement)

References 45 publications

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“…The Stöber method stands as a widely employed technique for synthesizing monodisperse silica particles, with applications across various fields. − This method employs silicon alkoxides, mostly tetraethyl orthosilicate (TEOS), which undergoes a series of hydrolysis and condensation reactions facilitated by the presence of ammonia acting as a catalyst. − The equilibrium between these reactions is crucial as it significantly influences the size, morphology, and microstructure of the resultant silica particles. Typically, higher ammonia concentrations foster the formation of highly condensed, uniform silica particles, whereas lower concentrations may lead to the production of particles with irregular shapes and sizes due to suboptimal reaction conditions.…”

Section: Introductionmentioning

confidence: 99%

Synthesis of Silica Particles with Controlled Microstructure via the Choline Hydroxide Cocatalyzed Stöber Method

Hu,

Cao,

Zhang

et al. 2024

Langmuir

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This study investigates the utilization of choline hydroxide as a cocatalyst in the Stober method to synthesize silica particles with controlled microstructure. Under low ammonia concentration, we add a robust organic base choline hydroxide and systematically explore the influence of choline hydroxide concentration on the hydrolysis and condensation equilibrium of tetraethyl orthosilicate (TEOS). Through the rational control of the water content, we significantly enhance both the size range and polydispersity of the resulting silica particles. Taking advantage of the regulated microstructure induced by controlled hydrolysis and condensation catalyzed by choline hydroxide, we achieved silica particles with hollow structures through hot water etching, exhibiting significantly enhanced surface area. These findings demonstrate the versatility of choline hydroxide as a cocatalyst in tailoring the microstructure of silica particles. In addition, due to its reducing ability and biocompatibility, which are not shared by other reported catalysts, the use of choline hydroxide opens up opportunities for applications in catalysis, sensing, and drug delivery.

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