pH 值对在水相介质中使用 PEO-PPO-PEO 三嵌段共聚物一步合成金纳米粒子的影响。

Effect of pH on the single-step synthesis of gold nanoparticles using PEO-PPO-PEO triblock copolymers in aqueous media.

机构信息

State Key Laboratory of Biochemical Engineering, Institute of Process Engineering, Chinese Academy of Sciences, Beijing, China.

出版信息

J Colloid Interface Sci. 2011 Nov 15;363(2):481-9. doi: 10.1016/j.jcis.2011.07.021. Epub 2011 Jul 22.

DOI:10.1016/j.jcis.2011.07.021

PMID:21855892

Abstract

The influence of pH value on gold nanoparticle production in the presence of Pluronic stabilizers is systematically investigated. The reactions are studied as a function of pH and at fixed concentrations of the two reactants, HAuCl(4) and P123 block copolymer. Results indicate that the reaction pathway during the nanoparticle formation can be controlled by varying pH. The nanoparticles synthesized at pH=11.12 have an average diameter of 9.6 nm with a narrow size distribution, and the Pluronics are adsorbed on individual gold particle surfaces to form core-shell structures via hydrophobic interactions. The present work provides an economic way to improve the dispersion and stabilization of gold nanoparticles and throws further light on the understanding of gold nanoparticle production using block copolymers.

摘要

系统研究了 pH 值对 Pluronic 稳定剂存在下金纳米颗粒生成的影响。研究了作为 pH 值的函数以及在两种反应物 HAuCl(4) 和 P123 嵌段共聚物的固定浓度下的反应。结果表明，可以通过改变 pH 值来控制纳米颗粒形成过程中的反应途径。在 pH=11.12 下合成的纳米颗粒平均直径为 9.6nm，具有较窄的尺寸分布，且 Pluronic 通过疏水相互作用吸附在单个金颗粒表面上形成核壳结构。本工作提供了一种经济的方法来改善金纳米颗粒的分散和稳定性，并进一步阐明了使用嵌段共聚物生产金纳米颗粒的原理。