Comparative study of thiol-free amphiphilic hyperbranched and linear polymers for the stabilization of large gold nanoparticles in organic solvent

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.…”

A rapid phase transfer method for nanoparticles using alkylamine stabilizers

“…Building of LB metal NP film needs to dissolve metal NPs in organic solvents to weaken the interfacial energy between metal NPs [17,18]. In these cases, the phase transfer of metal NPs from aqueous to organic media is usually required.…”

“…Eastoe also developed a purification method of NPs using (1-hexadecyl)trimethylammonium bromide (CTAB) as stabilizer via tuning the solvent quality [24,25]. Like small organic surfactants, polymer ligands have also been tried in some methods to achieve the phase transfer of metal NPs from aqueous to organic media [17,26,27]. However, most of the methods need two or more steps and consume several hours.…”

Hyperbranched Polysiloxanes Based on Polyhedral Oligomeric Silsesquioxane Cages with Ultra-High Molecular Weight and Structural Tuneability

“…Refluxing polymer 2 with triethylphosphite resulted in around 59% incorporation of phosphonate groups (as shown in Figure 5, detailed analysis in Figure S7), and the obtained polymer 3 dissolves in various solvents very well, but still not in methanol, probably because the polar phosphonate groups are buried within the polymer, preventing effective interaction with the methanol solvent molecules. Dendritic polymers, either hyperbranched ones or dendrimers, have been proved useful in stabilizing transition nanoparticles [50][51][52][53], which are of high importance in organic catalysis. The presence of rigid POSS subunits are helpful for forming internal porosity to host such nanoparticle, especially with the assistance of polar phosphonate groups introduced in polymer 3.…”