TY - JOUR
TI - Micellization in pH-sensitive amphiphilic block copolymers in aqueous media and the formation of metal nanoparticles
AU - Maria Vamvakaki
AU - Lampros Papoutsakis
AU - Vasilios Katsamanis
AU - Theodora Afchoudia
AU - Panagiota G. Fragouli
AU - Hermis Iatrou
AU - Nikos Hadjichristidis
AU - Steve P. Armes
AU - Stanislav Sidorov
AU - Denis Zhirov
AU - Vasilii Zhirov
AU - Maxim Kostylev
AU - Lyudmila M. Bronstein
AU - Spiros H. Anastasiadis
JO - Faraday Discussions
PY - 2005
VL - 128
TODO - null
SP - 129
PB - Royal Society of Chemistry (RSC)
SN - 0301-7249, 1364-5498
TODO - 10.1039/b403414g
TODO - amine;  copolymer;  macrogol derivative;  metal complex;  metal derivative;  polyethylene derivative;  polymethacrylic acid derivative;  polyvinyl derivative, aqueous solution;  article;  atomic force microscopy;  hydrophilicity;  hydrophobicity;  light scattering;  micelle;  micellization;  molecular size;  nanoparticle;  nanotechnology;  pH;  polymerization;  potentiometric titration;  proton transport;  reduction;  solubility;  synthesis;  transmission electron microscopy
TODO - Dynamic light scattering, potentiometric titration, transmission electron microscopy and atomic force microscopy have been used to investigate the micellar behaviour and metal-nanoparticle formation in poly(ethylene oxide)-block-poly(2-vinylpyridine), PEO-b-P2VP, poly(hexa(ethylene glycol) methacrylate)-block-poly(2-(diethylamino)ethyl methacrylate), PHEGMA-b-PDEAEMA, and PEO-b-PDEAEMA amphiphilic diblock copolymers in water. The hydrophobic block of these copolymers (P2VP or PDEAEMA) is pH-sensitive: at low pH it can be protonated and becomes partially or completely hydrophilic leading to molecular solubility whereas at higher pH micelles are formed. These micelles consist of a P2VP or PDEAEMA core and a PEO or PHEGMA corona, respectively, where the core forming amine units can incorporate metal compounds due to coordination. The metal compounds (e.g., H2PtCl6, K2PtCl 6) can either be introduced in a micellar solution, where they are incorporated within the micelle core via coordination with functional groups, or can be added to a unimer solution at low pH, where they lead to a metal-induced micellization. In these micellar nanoreactors, metal nanoparticles nucleate and grow upon reduction with sizes in the range of a few nanometers as observed by TEM. The effect of the metal incorporation method on the characteristics of the micelles and of the synthesized nanoparticles is investigated.
ER -