0000000000122539

AUTHOR

Dmitri Spetter

showing 4 related works from this author

Block copolymers from ionic liquids for the preparation of thin carbonaceous shells

2017

This paper describes the controlled radical polymerization of an ionic-liquid monomer by RAFT polymerization. This allows the control over the molecular weight of ionic liquid blocks in the range of 8000 and 22000 and of the block-copolymer synthesis. In this work we focus on block copolymers with an anchor block. They can be used to control the formation of TiO2 nanoparticles, which are functionalized thereafter with a block of ionic-liquid polymer. Pyrolysis of these polymer functionalized inorganic nanoparticles leads to TiO2 nanoparticles coated with a thin carbonaceous shell. Such materials may, e.g., be interesting as battery materials.

polymeric ionic liquidRadical polymerizationblock copolymer02 engineering and technology010402 general chemistry01 natural sciencesFull Research Paperlcsh:QD241-441chemistry.chemical_compoundlcsh:Organic chemistryPolymer chemistryCopolymerReversible addition−fragmentation chain-transfer polymerizationlcsh:Scienceionic liquidchemistry.chemical_classificationRAFT polymerizationcarbonOrganic ChemistryPolymer021001 nanoscience & nanotechnologyBlock (periodic table)0104 chemical sciencesChemistryMonomerchemistryIonic liquidlcsh:Q0210 nano-technologyPyrolysisBeilstein Journal of Organic Chemistry
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Correlation of epoxy material properties with the toughening effect of fullerene-like WS2 nanoparticles

2016

Abstract This work deals with the toughening effect of inorganic, fullerene-like WS2 (IF-WS2) nanoparticles (NPs) on epoxy. It has been hypothesized that this toughening effect depends on the epoxy’s cross-link density, its molecular defect fraction or its reference fracture toughness K Ic . Seven different epoxy systems were filled with 0.5% laboratory-made IF-WS2 NPs by mass and investigated in order to analyze which material properties are determining the toughening effect. These NPs were similar to commercially available IF-WS2 NPs, but their agglomerates could not be broken up as successfully and they yielded less toughening effect. The cross-link density of the epoxies measured via dy…

FullereneMaterials sciencePolymers and PlasticsOrganic ChemistryGeneral Physics and AstronomyNanoparticle02 engineering and technologyEpoxy010402 general chemistry021001 nanoscience & nanotechnology01 natural sciencesToughening0104 chemical sciencesFracture toughnessAgglomeratevisual_artMaterials Chemistryvisual_art.visual_art_mediumComposite material0210 nano-technologyMaterial propertiesThermal analysisEuropean Polymer Journal
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Solvothermal Synthesis of Molybdenum–Tungsten Oxides and Their Application for Photoelectrochemical Water Splitting

2018

Molybdenum and tungsten oxides are of interest as semiconductors for the production of clean and sustainable energy. Here we show that synergistic effects arising from a combination of noncrystalli...

inorganic chemicalsMaterials scienceGeneral Chemical EngineeringSolvothermal synthesisMolybdenum oxidechemistry.chemical_element02 engineering and technologyTungsten010402 general chemistry01 natural sciencesEnvironmental ChemistryRenewable Energy Sustainability and the Environmentbusiness.industrytechnology industry and agricultureTungsten oxideGeneral Chemistryequipment and supplies021001 nanoscience & nanotechnology0104 chemical sciencesSustainable energyenzymes and coenzymes (carbohydrates)SemiconductorchemistryChemical engineeringMolybdenumbacteriaWater splitting0210 nano-technologybusinessACS Sustainable Chemistry & Engineering
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Surface Defects as a Tool to Solubilize and Functionalize WS 2 Nanotubes

2017

Layered transition metal dichalcogenides contain a number of crystal defects which significantly change their properties may be beneficial or detrimental for a specific application. We have prepared defect-rich multiwalled WS2 nanotubes by reductive sulfidization of W18O49 nanowires that were obtained solvothermally from tungsten chloride in different alcohols. The synthesis of the W18O49 nanowires was monitored and their morphological characteristics (e. g. length, rigidity and aspect ratio) are described in detail. The effect of morphology of the nanowires on the synthesis of WS2 nanotubes was investigated in order to obtain WS2 nanotubes that are highly solvent dispersible. Dispersions o…

Tungsten disulfideSelective chemistry of single-walled nanotubesNanowireNanoparticleNanotechnology02 engineering and technology010402 general chemistry021001 nanoscience & nanotechnology01 natural sciences0104 chemical sciencesInorganic ChemistryOptical properties of carbon nanotubeschemistry.chemical_compoundsymbols.namesakechemistryChemical engineeringElectron diffractionsymbols0210 nano-technologyHigh-resolution transmission electron microscopyRaman spectroscopyEuropean Journal of Inorganic Chemistry
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