Palladium Nanoparticle Catalyst Prepared in Poly(Acrylic Acid)-lined Channels of Diblock Copolymer Microspheres

Abstract

Block copolymers self-assemble in bulk, forming a number of intricate block segregation patterns. Such assembled structures can serve as precursors to nano- or microstructures with numerous potential applications. For many applications, such as catalysis, a high surface area to volume ratio is desirable, which requires “breaking up” copolymer solid into dispersed particles. Reported in this letter is the preparation of water-dispersible block copolymer microspheres containing Pd nanoparticles. The Pd nanoparticles are a more efficient catalyst for alkene hydrogenation than is the commercial Pd black catalyst.

Cooperative Assembly of Block Copolymers with Deformable Interfaces: Toward Nanostructured Particles

“…These colloidal particles with nanoscopic internal structures are potentially applicable to various particle-based technologies such as photonic bandgap materials, [23,24] conductive particles for anisotropic conductive films based on block copolymer/ metal nanoparticle composites, [25,26] porous particles, [27] optical actuation in microfluidic chips, [28] optochemical sensing devices, [29] and catalytic supports. [22,30] To the best of our knowledge, this is the first report on the structural evolution of a block copolymer driven by controlling the dynamics of the mobile interface and the commensurability of the block copolymer confined in emulsion droplets. In the present system, there are two compositional parameters: the volume fraction (F) of hPS out of the total volume of hPS and PS-b-PB and the volume fraction ( f s ) of PS blocks out of the total volume of PS and PB blocks in the mixed surfactant, PS-b-PEO and PB-b-PEO.…”

“…However, because methods for modifying the surfaces of such confining geometries have not been well-developed, many studies have not considered wall effects. [20][21][22] This is especially true of confining geometries with a mobile interfacial boundary, in which the dynamics of the interface may affect the shape of the confining geometry as well as the internal phase morphology. Here, we explored the interface-driven morphological evolution of a symmetric diblock copolymer of polystyreneblock-polybutadiene (PS-b-PB) confined in oil-in-water emulsion droplets.…”

Development of highly transparent Pd-coated Ag nanowire electrode for display and catalysis applications

“…Although Pd coating on Ag nanowires is expected to reduce haze, a certain level of sheet resistance increase is also expected for Ag@Pd films compared to that of pristine Ag nanowire. This is mainly due to differences in bulk resistivity of Pd (105.4 nΩ·m) and Ag (15.87 nΩ·m) metals.Additionally, this new Ag@Pd core-shell system can render excellent catalytic activities as a result of their high aspect ratios and they can reduce the cost of catalysis since a very thin layer (shell) requires little amount of Pd material.It's well known in the literature that palladiumderivatives and Pd-based nanostructurescan be used as catalysts in numerous chemical reactions and syntheses [20][21][22].In particular, nanostructured palladium catalysts increase the rate and yield of the reactions significantly where surface area is a key function [21]. On the other hand, fuel cell catalysts with Pd content produce higher energy than those without Pd in it [23].…”

Nanoparticulate Catalysts Based on Nanostructured Polymers

“…On the other hand, microspheres formed by diblock poly( t -butyl acrylate) -block -poly(2 -cinnamoyloxyethyl methacrylate) and fi lled with Pd nanoparticles demonstrated good permeability and higher catalytic activity in the hydrogenation of methyl methacrylate than the commercial Pd black catalyst [14] .…”