成核
丙烯酸
正硅酸乙酯
纳米颗粒
材料科学
胶体
氨
化学工程
纳米技术
化学
有机化学
复合材料
工程类
单体
聚合物
作者
Feng Hu,Kowsalya Devi Rasamani,Sasitha C. Abeyweera,Dongtang Zhang,Yugang Sun
出处
期刊:ChemNanoMat
[Wiley]
日期:2022-02-18
卷期号:8 (3)
被引量:2
标识
DOI:10.1002/cnma.202200006
摘要
Abstract Robust synthesis of small colloidal silica (SiO 2 ) nanoparticles with narrow size distributions (<5%) is challenging because the possible involvement of continuous nucleation and growth of SiO 2 in the widely used Stöber process usually results in silica nanoparticles with large sizes and broad size distributions. Promoting heterogeneous nucleation and growth of silica is promising to tackle the challenges by in‐situ forming transient colloidal seeds that provide nucleation surfaces for silica condensate. In this work, poly(acrylic acid) (PAA) is introduced to the Stöber synthesis solutions, which are usually composed of ethanol (containing a trace amount of water), tetraethyl orthosilicate (TEOS), and ammonia, to mediate the nucleation of TEOS hydrolysates and growth of SiO 2 nanoparticles. PAA reacts with ammonia to form soft PAA‐NH 3 complex colloids that serve as transient seeds to facilitate heterogeneous nucleation and growth of SiO 2 nanoparticles after adding TEOS to the synthesis solution. The number of PAA‐NH 3 complex colloidal particles, which strongly depends on the molar ratio of PAA and ammonia, determines the number of the resulting SiO 2 nanoparticles and thus the size of the SiO 2 nanoparticles correspondingly according to the supply of TEOS. Highly uniform SiO 2 nanoparticles with finely tuned diameters in the sub‐100 region have been successfully synthesized, and the synthesis protocol is feasible to be scaled up while maintaining the high quality of SiO 2 nanoparticles.
科研通智能强力驱动
Strongly Powered by AbleSci AI