Redispersible Gold Nanoparticle/Polymer Composite Powders Ready for Ligand Exchange Reactions

Abstract

Dry powders embedded with gold nanoparticles (AuNPs) are produced by spray‐drying technique from an aqueous AuNP dispersion in a poly(vinyl alcohol) (PVA) or poly(vinyl pyrrolidone) (PVP) matrix. The prepared powders consist of AuNPs stabilized in hollow capsules of PVA (PVA@AuNP) or PVP (PVP@AuNP) with an average diameter of several micrometers. The AuNP powders are dispersible in water and no agglomeration triggered by the spray drying process of AuNPs is observed. The PVA@AuNP powders are coextruded with polycaprolactone to demonstrate the industrial application of dry‐state AuNPs. With PVP@AuNP the incorporation of AuNP into other stabilizing polymers via ligand exchange method is facilitated. After each step, the active surface of the AuNPs was tested by catalytic studies.

Poly(p-xylylene) Nanotubes Decorated with Nonagglomerated Gold Nanoparticles for the Alcoholysis of Dimethylphenylsilane

“…Commonly used techniques for nanoparticle stabilization are electrostatic repulsion between adsorbed charged molecules, 11,12 steric shielding using polymers on the nanoparticle surface, 13−25 as well as spray drying of microparticles, which was recently reported by us. 26 In this work, gold nanoparticles (AuNPs) were used as they have been well established as model nanoparticles for exploring different applications in combination with different strategies for stabilization against their agglomeration. 27 AuNPs have attracted significant attention as catalysts, 7,8 such as the catalytic reactions like oxidation of carbon monoxide, 28,29 hydrogenation of alkynes, 30 or reduction of nitrophenol.…”

“…For this reason, proper stabilization and the prevention of agglomeration is essential for the successful application of nanoparticle-based devices. Commonly used techniques for nanoparticle stabilization are electrostatic repulsion between adsorbed charged molecules, , steric shielding using polymers on the nanoparticle surface, − as well as spray drying of microparticles, which was recently reported by us . In this work, gold nanoparticles (AuNPs) were used as they have been well established as model nanoparticles for exploring different applications in combination with different strategies for stabilization against their agglomeration …”

Aerosolised micro and nanoparticle: formulation and delivery method for lung imaging

“…However, the SASD method poses challenges, including sophisticated instrumentation, high costs, and the presence of organic solvent residuals in the end product [89], which hampers further development in inhalable powder technology [20,[90][91][92]. For instance, a nanohybrid for dual-imaging consisting of strawberry-like gold-coated magnetite nanocomposites was developed by Silva et al by SASD method.…”

“…Although gold and iron NP are the only investigated contrast agent as inhalable powder via spray drying [90][91][92], this method is suitable for formulating other contrast or tracing agent into dry powder. The ability to design particle size, structure, and composition makes spray drying a promising method to produce inhalable powder for lung imaging.…”

Gold nanoparticles embedded into imidazolium-functionalized porous aromatic frameworks as heterogenous nanoreactors for the hydrogenation of nitroaromatics

“…[25][26][27][28] Porous materials with abundant anchoring sites or appropriate pore size to reinforce metal-support interaction are developed as favourable support materials. [29][30][31][32][33][34][35][36][37][38][39][40] Among the numerous porous materials, porous aromatic frameworks (PAFs) featuring diverse synthesis strategies and high stabilities stand out. It is feasible to insert functional groups into PAFs' skeletons that will enhance the interaction between metal…”