Synthesis of new functionalized polymers and their use as stabilizers of Pd, Pt, and Rh nanoparticles. Preliminary catalytic studies

Favier, Isabelle; Gómez, Montserrat; Muller, Guillermo; Picurelli, David; Nowicki, Audrey; Roucoux, Alain; Bou, Jordi J.

doi:10.1002/app.26452

Cited by 20 publications

(12 citation statements)

References 82 publications

(71 reference statements)

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“…Thus, the real coverage will be (16) where Γ A ′ and Γ B ′ are the experimental coverages of blocks A and B from Table 2 and S B is the area covered by polymer B. In our previous work, we found that under similar solvent conditions, i.e., good solvent for PMMA, 32 the coverage of adsorbed PMMA homopolymers on the same type of surfaces is independent of molecular weight but dependent only on surface curvature, yielding the following results (in units monomers/nm 2 ): Γ PMMA (400) = 66, Γ PMMA (97) = 19, and Γ PMMA (39) = 6.7.…”

Section: Resultsmentioning

confidence: 99%

Adsorption of Block Copolymers from Selective Solvents on Curved Surfaces

Hershkovits

Tannenbaum

2008

Macromolecules

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We have investigated the adsorption of asymmetric poly(styrene-b-methyl methacrylate) block copolymers (PS-PMMA) from a selective solvent onto alumina (Al 2 O 3 ) particles having variable and controllable radii. The solvent used was a bad solvent for the PS block (block A) and a good solvent for the PMMA block (block B), which has a higher affinity of the surface. Such a case represents a new class of adsorption, where both blocks compete for the adsorption sites of the metallic surface. Two theoretical models, the modified drops model and the perforated film model, have been evaluated as appropriate representation of such an adsorption scenario. The experimental results indicated that the adsorption of the PS-PMMA block copolymer generated a patterned surface comprised of a homogeneous melt layer of the PS block perforated with holes having a variable PMMA structure, depending on the distance from the bottom of the hole (alumina surface) and the distance from walls of the hole. The density gradient of the PMMA moiety in the hole reverted to the classical brush morphology at a critical distance from the surface of the hole.

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Section: Resultsmentioning

confidence: 99%

Adsorption of Block Copolymers from Selective Solvents on Curved Surfaces

Hershkovits

Tannenbaum

2008

Macromolecules

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“…8). [71] Favier et al [72] reported Pd, Pt and Rh NPs stabilized by main chain chiral polymers. The commercial polymer Gantrez (GAF) was chirally fuctionalized using borneol, aminobutanol or α-methylbenzylamine.…”

Section: Polymer-stabilized Npsmentioning

confidence: 99%

Transition‐metal nanoparticles: synthesis, stability and the leaching issue

Pachón

Rothenberg

2008

Applied Organom Chemis

409

202

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This perspective examines the state-of-the-art of catalysis by metal nanoparticles. We outline various methods for preparing metal nanoparticle suspensions, and highlight the role of the stabilizers and the stabilizing principles. Subsequently, we examine some catalytic applications of homometallic and bimetallic nanoparticle suspensions in a variety of reactions. The cases are divided according to the stabilizing agent: polymers, dendrimers, ionic liquids, surfactants, micelles and micoremulsions, ligands and solid supports. We explain the importance of atom/ion leaching (all too frequent in nanoparticle catalysis, especially for the catalytically active group VIII metals) and consider ways of minimizing it. The future perspectives of nanoparticles as catalysts are discussed.

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“…[34] HR-MAS NMR has also been used to study the functionalization of poly hydroxyethyl methacrylate (HEMA) cryogels, [35] cyclomaltoheptaose polymers, [36] the synthesis of hyper-branched bis (hydroxymethyl) propionic acid (bis-MPA) polymers as a function of catalysts, [37] and polymers for nanoparticle stabilization. [38] HR-MAS NMR has found use in investigation of porous polyalkylvinyl ether polymer particles being used for stationary phases in chromatographic applications. These measurements were performed using the same solvent as HPLC and allowed details about the polymer structure and mobility to be evaluated; these properties are expected to impact the chromatographic process.…”

Section: Polymersmentioning

confidence: 99%