Raspberry-like Pt clusters with controlled spacing produced by deposition of loaded block copolymer micelles from supercritical CO2

Kolomytkin, Dmitry; Elmanovich, Igor V.; Abramchuk, S. S.; Pospiech, Doris; Möller, Martin; Gallyamov, Marat O.; Khokhlov, Alexei R.

doi:10.1016/j.eurpolymj.2015.07.048

Cited by 4 publications

(3 citation statements)

References 61 publications

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“…121 When NPs are formed in a micelle corona (with or without ionic surfactant to impart functionality), the NPs are well accessible to reacting molecules, which increases the catalytic efficiency, but such NPs could be prone to aggregation. 108,116,122 In a recent paper, Sugihara et al reported syntheses of ABC triblock copolymers of poly[2-(methacryloyloxy)ethyl phosphorylcholine]-b-poly [2-(dimethylamino)ethyl methacrylate]b-poly(2-hydroxypropyl methacrylate) of different micellar morphologies (spheres, worms, jellyfish, vesicles) filled with Ag NPs (Figure 7). 123 The catalyst based on wormlike micelles displayed the highest rate constant in the 4-NP reduction with NaBH 4 compared to vesicles and spheres, which was assigned by the authors to the highest predicted surface area of worms.…”

Section: Polymer Orderingmentioning

confidence: 99%

“…Polymer ordering is well represented by amphiphilic block copolymers which form micelles in selective solvents or exhibit microphase segregation in solid state, thus creating nanostructures. − The block copolymer micelles, whose cores or shells or both are filled with catalytic metal NPs (colloids) have been first reported in the mid-90s and have attracted considerable attention in the following decades. − It was demonstrated that spherical NPs formed in the micelle cores are well stabilized and their sizes can be controlled by metal compound loading, the micelle core density, and a reducing agent type. , Both the NP size and the micelle core density can influence the NP catalytic performance because catalytic properties are size dependent, while the density of a polymer matrix surrounding the NPs affects access of reacting molecules to catalytic sites. , Cross-linking of the micelle cores allows for NP stabilization and better control of their characteristics . When NPs are formed in a micelle corona (with or without ionic surfactant to impart functionality), the NPs are well accessible to reacting molecules, which increases the catalytic efficiency, but such NPs could be prone to aggregation. ,, …”

Section: Polymer Orderingmentioning

confidence: 99%

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Role of Polymer Structures in Catalysis by Transition Metal and Metal Oxide Nanoparticle Composites

2019

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Nanoparticle (NP)/polymer nanocomposites received considerable attention because of their important applications including catalysis. Metal and metal oxide NPs may impart catalytic properties to polymer nanocomposites, while polymers with a different structure, functionality, and architecture control the NP formation (size, shape, location, composition, etc.) and in this way, govern catalytic properties of nanocomposites. In this review we will discuss the influence of the polymer nanostructure (thin or grafted layers, polymer ordering, polymer nanopores), architecture (branched vs linear), functional groups (coordinating or ionic), specific properties (reducing, stimuli responsive, conductive), etc. on the formation of metal or metal oxide NPs and the catalytic behavior of the nanocomposites. The development of novel and efficient catalysts is crucial for progress in chemical sciences, and this explains a huge number of publications in this area in recent years. Taking into consideration previous review articles on NP/polymer catalysts, we limited this review to a discussion of a narrow temporal scope (2017–April 2019), while embracing a broad subject scope, i.e., considering any polymers and NPs which form catalytic nanocomposites. This gives us a unique view of the field of catalytic polymer nanocomposites and allows understanding of where the field is going.

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Section: Polymer Orderingmentioning

confidence: 99%

Section: Polymer Orderingmentioning

confidence: 99%

Role of Polymer Structures in Catalysis by Transition Metal and Metal Oxide Nanoparticle Composites

2019

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“…Kolomytkin et al used sc CO 2 to dissolve BCP M73sf27‐26. After slow decompression, aggregated BCP micelles with diameter 43–47 nm (now having the PsfMA block as corona because sc CO 2 is a selective solvent for PsfMA) were generated.…”

Section: Resultsmentioning

confidence: 99%

Semifluorinated PMMA Block Copolymers: Synthesis, Nanostructure, and Thin Film Properties

Pospiech

Jehnichen

Eckstein

et al. 2017

Macro Chemistry & Physics

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Diblock copolymers (BCP) with poly(methyl methacrylate) and poly(1H,1H,2H,2H-perfluorodecyl methacrylate) (PsfMA) blocks prepared by anionic polymerization in tetrahydrofuran at −78 °C and atom transfer radical polymerization (ATRP) at 60 °C, respectively, with stepwise varied composition over a wide range in the phase diagram are compared with respect to synthesis limits, phase separation behavior in bulk, and properties of thin films. Both methods yield BCPs with low dispersity (1.1-1.2) at molar masses below 100 kg mol −1 . Higher semifluorinated contents can be achieved by ATRP in 1,3-bis(trifluoromethyl)benzene which ensured solubility of PsfMA. BCPs obtained by anionic polymerization show a more distinct phase separation, that is, more regular nanostructures. Additionally, self-organization of the semifluorinated side chains occurs generating smectic layers which alters in turn the BCP morphology especially in thin films as compared to non-semifluorinated BCP. All BCPs show amphiphilic behavior and form micelles in organic solvents which can be used to deposit nanoparticles. periodic structures is the low dispersity − D of both blocks in the BCP which can mostly be achieved by employing controlled polymerization conditions. Although more and more methods of controlled polymerizations appear, such as light-controlled polymerization of methacrylates to BCP in a one-pot procedure, [7] visible-light polymerization from hyperbranched poly(methyl methacrylate) macroinitiators catalyzed by Mn 2 (CO) 10 , [8] combination of polymerization and click chemistry, and many others, and taking the variety of BCP syntheses results reported into account, standard techniques for BCP synthesis as anionic polymerization and atom transfer radical polymerization (ATRP) still appear to be the most successful with regards to achieving low dispersity and high control over the structure and molar mass.In this study, we want to compare diblock copolymers with a poly(methyl methacrylate) (PMMA) and a

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Polymer materials for electrochemical applications: Processing in supercritical fluids

Kondratenko

Elmanovich

Gallyamov

2017

The Journal of Supercritical Fluids

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Raspberry-like Pt clusters with controlled spacing produced by deposition of loaded block copolymer micelles from supercritical CO2

Cited by 4 publications

References 61 publications

Role of Polymer Structures in Catalysis by Transition Metal and Metal Oxide Nanoparticle Composites

Role of Polymer Structures in Catalysis by Transition Metal and Metal Oxide Nanoparticle Composites

Semifluorinated PMMA Block Copolymers: Synthesis, Nanostructure, and Thin Film Properties

Polymer materials for electrochemical applications: Processing in supercritical fluids

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