Preparation and characterization of novel thermoresponsive gold nanoparticles and their responsive catalysis properties

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.…”

One-pot synthesis of Ag–Au bimetallic nanoparticles with Au shell and their high catalytic activity for aerobic glucose oxidation

“…Hence, it is of great interest and challenge to prepare Ag core /Au shell BNPs with size less than 2 nm by a simple method using a nonpoisonous protective reagent as PVP. From the view point of gold catalysts, on which much attention has been received recently [25][26][27][28][29][30], such fine Ag core /Au shell BNPs are interesting because gold catalysts are believed to be active when (1) the size is less than 2 nm [25,31], (2) the electronic charge of Au atoms is rather negative [32,33], and (3) the total perimeter of the boundary between Au nanoparticles and other elements like supports is long [34,35].…”

Polymer Protected Gold Nanoparticles: Synthesis, Characterization and Application in Catalysis

“…Citrate-reduced AuNPs (average diameter is 14 nm) protected by thermoresponsive hyperbranched polyethylenimine with isobutyramide groups (HPEI-IBAm) was used as recyclable responsive catalysts for the reduction reaction of 4-nitrophenol by NaBH4 [53]. By choosing the right capping HPEI-IBAm polymers, the reaction was faster than that catalyzed by AuNPs without capping polymers.…”