title: Effect of pH on the single-step synthesis of gold nanoparticles using PEO-PPO-PEO triblock copolymers in aqueous media.
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.
authors.affiliation: State Key Laboratory of Biochemical Engineering, Institute of Process Engineering, Chinese Academy of Sciences, Beijing, China.
authors.forename: Qinghui
authors.initials: Q
authors.lastname: Shou
authors.forename: Chen
authors.initials: C
authors.lastname: Guo
authors.forename: Liangrong
authors.initials: L
authors.lastname: Yang
authors.forename: Lianwei
authors.initials: L
authors.lastname: Jia
authors.forename: Chunzhao
authors.initials: C
authors.lastname: Liu
authors.forename: Huizhou
authors.initials: H
authors.lastname: Liu
mesh_terms: D006046:Gold / Q000737:chemistry*; D006863:Hydrogen-Ion Concentration; D008027:Light; D053768:Metal Nanoparticles / Q000737:chemistry*; D010316:Particle Size; D011092:Polyethylene Glycols / Q000737:chemistry*; D011409:Propylene Glycols / Q000737:chemistry*; D013499:Surface Properties; D014867:Water / Q000737:chemistry
chemical_list: C116176:PEO-PPO-PEO; D011409:Propylene Glycols; D014867:Water; D011092:Polyethylene Glycols; D006046:Gold