Nanopartikel — Materialien der Zukunft: Maßgeschneiderte Werkstoffe

Rössler, Albert; Skillas, G.; Pratsinis, Sotiris E.

doi:10.1002/1521-3781(200101)35:1<32::aid-ciuz32>3.0.co;2-j

Cited by 9 publications

(5 citation statements)

References 12 publications

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“…iron-, titanium-, zirconium-and zincoxides, because of their interesting properties. 25,26 The oxide formation occurred in a microemulsion via hydrolysis of metal salts with an aqueous ammonia solution. After stirring for 24 h at room temperature the formed particles were isolated.…”

Section: Inorganic Particle Synthesismentioning

confidence: 99%

Hybrid inorganic–organic core–shell metal oxide nanoparticles from metal salts

Holzinger

Kickelbick

2004

J. Mater. Chem.

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Section: Inorganic Particle Synthesismentioning

confidence: 99%

Hybrid inorganic–organic core–shell metal oxide nanoparticles from metal salts

Holzinger

Kickelbick

2004

J. Mater. Chem.

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“…Catalysts are generally metal or metal oxide NPs with sizes from 1 to 10 nm and outstanding surface-to-volume ratios. Thereby, it is worthy to consider that a decrease in particle size (PS) from 10 to 1 nm will result in an increase in the amount of shell atoms from 20% to 99% and that these surface atoms are chemically more active compared to the bulk atoms [4]. To understand the relationship between PS and catalytic activity, it must be considered that, as a rule of thumb for monometallic NPs, the catalytic activity depends on the fraction of surface atoms on corners and edges, i.e., the PS, while for bimetallic NPs, the catalytic productivity is also strongly influenced by surface segregation [5].…”

Section: Introductionmentioning

confidence: 99%

Deposition of Pd, Pt, and PdPt Nanoparticles on TiO2 Powder Using Supercritical Fluid Reactive Deposition: Application in the Direct Synthesis of H2O2

Crone,

Trinkies,

Dittmeyer

et al. 2024

Molecules

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In this study, we investigated the catalytic properties of mono- and bimetallic palladium (Pd) and platinum (Pt) nanoparticles deposited via supercritical fluid reactive deposition (SFRD) on titanium dioxide (TiO2) powder. Transmission electron microscopy analyses verified that SFRD experiments performed at 353 K and 15.6 MPa enabled the deposition of uniform mono- and bimetallic nanoparticles smaller than 3 nm on TiO2. Electron-dispersive X-ray spectroscopy demonstrated the formation of alloy-type structures for the bimetallic PdPt nanoparticles. H2O2 is an excellent oxidizing reagent for the production of fine and bulk chemicals. However, until today, the design and preparation of catalysts with high H2O2 selectivity and productivity remain a great challenge. The focus of this study was on answering the questions of (a) whether the catalysts produced are suitable for the direct synthesis of hydrogen peroxide (H2O2) in the liquid phase and (b) how the metal type affects the catalytic properties. It was found that the metal type (Pd or Pt) influenced the catalytic performance strongly; the mean productivity of the mono- and bimetallic catalysts decreased in the following order: Pd > PdPt > Pt. Furthermore, all catalysts prepared by SFRD showed a significantly higher mean productivity compared to the catalyst prepared by incipient wetness impregnation.

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“…Much more interesting was the fact, that decreasing particle sizes are expected to overlay the chemical properties of the resulting cellulose composite by its interfacial properties. [1] Under the proviso, that it would succeed to exploit the capabilities of surface and matrix manipulation already described for combinations of synthetic fibres and polymer bulk materials [2][3][4][5] , such as increase of textile-mechanical fibre characteristics (tenacity, E-modulus) improvement of heat resistance improvement of colour brilliance at reduced dye consumption decreased permeation behaviour of polymer films for gases and vapours changing heat-and electric conductivity influenced surface-and interfacial properties of shaped bodies changing swelling behaviour in liquids or retention behaviour for liquids change of polymer compatibility against secondary components still considered as being incompatible for cellulose as well, then very interesting opportunities for the development of shaped cellulosic bodies possessing improved product characteristics would result.…”

Section: Introductionmentioning

confidence: 99%

Nanoparticle Modified Cellulose Fibres

Melle

Mooz

Meister

2006

Macromolecular Symposia

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The dissolution of cellulose in N-methylmorpholine-N-oxide monohydrate exhibits a remarkable acceptance towards well ground organic or inorganic additives up to high concentrations. Particle sizes generally in the lower micrometer range have been the most common features of all additives applied up to now. With the assumption, that it would succeed to exploit the capabilities to a surface and matrix manipulation already described for combinations of synthetic fibres and polymer bulk materials for cellulose as well, then very interesting opportunities for the development of shaped cellulosic bodies would result that possess improved product characteristics. Inorganic, hydrophilic nanoclays and different organic modified nanoparticles of various manufacturers were chosen for the investigation. The effect of the different nanoparticle types on the matrix structure after the incorporation was determined by means of X-ray wide angle scattering. Nanoadditives did not influence the structural formation of cellulose shapes significantly. Compared to a film forming process, in case of fibre spinning it was found that the nanoclays obviously underwent a preferred orientation as a result of the solvent extraction after a dry-wet extrusion process.

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Nanopartikel — Materialien der Zukunft: Maßgeschneiderte Werkstoffe

Cited by 9 publications

References 12 publications

Hybrid inorganic–organic core–shell metal oxide nanoparticles from metal salts

Hybrid inorganic–organic core–shell metal oxide nanoparticles from metal salts

Deposition of Pd, Pt, and PdPt Nanoparticles on TiO2 Powder Using Supercritical Fluid Reactive Deposition: Application in the Direct Synthesis of H2O2

Nanoparticle Modified Cellulose Fibres

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