Thermoresponsive gold nanoparticles with adjustable lower critical solution temperature as colorimetric sensors for temperature, pH and salt concentration

Comparative study of alkylthiols and alkylamines for the phase transfer of gold nanoparticles from an aqueous phase to n-hexane

“…S1b), implying the potential aggregation or coagulation of Au-NPs in the n-hexane phase after the ODT-assisted phase transfer. Similar color changes from red to purple to blue were observed during the coalescence of Au-NPs [35][36][37].…”

Multifunctional covalently stabilized vesicles acting simultaneously as the template of gold nanoparticle cluster and the nanocarrier of guest molecules

“…This meant that many hydrophilic spheroid-like hyperbranched PEIs were discretely distributed in the continuous hydrophobic PCL domain in the corona. Since hyperbranched PEI and its derivatives have been proved to be good stabilizer of AuNPs [68][69][70], in this paper we attempted to utilize the obtained novel covalent stabilized vesicle (CSV) as multifunctional hosts to simultaneously load hydrophilic AuNPs and hydrophobic organic guests using the hydrophilic PEI units and the hydrophobic PCL domain, respectively (Scheme 1).…”

“…Since hyperbranched PEI and its derivatives have been proved to be good stabilizer of AuNPs [68][69][70], we attempted to prepare the AuNP nanoclusters using the obtained CSVs as depicted in Scheme 1. First, these CSVs were mixed with a portion of HAuCl 4 in water to form the complex through the acid-base interaction, and then the HAuCl 4 salts were reduced by NaBH 4 to form the AuNP clusters stabilized by the CSVs.…”

Coating matters: the influence of coating materials on the optical properties of gold nanoparticles

“…Physical adsorption (physisorption) of polymers on gold nanoparticles is based on relatively weak interactions between the polymer and the gold surface rather than on covalent links, thus allowing for straightforward post-synthetic surface modifi cations. The polymer can either wrap around the particle or adsorb in a patchy manner [83,84] on the particle surface, depending on the size of the particles, the chain length (and structure) of the polymer and the solvent. When the polymers are charged (polyelectrolytes), those with a charge opposite to that on the particle surface will adsorb onto it in a relatively fl at orientation and may neutralize or overcompensate the surface charge of the particle.…”