Results 121 to 130 of about 8,894 (158)

A Heparinase Sensor Based on a Ternary System of Hg²⁺–Heparin–Osmium Nanoparticles

Analytical Chemistry, 2019
A visual assay for the detection of heparinase was developed on the basis of a ternary system of Hg2+-heparin-osmium nanoparticles (OsNPs). First, heparin-capped OsNPs (heparin-OsNPs) were synthesized by a facile reduction method using heparin as the protecting/stabilizing agent. The oxidase-like activity of heparin-OsNPs, however, turned out to be low,
Shao-Bin He, Quan-Quan Zhuang, Liu Yang, Mei-Ying Lin, Ye Kuang, Hua-Ping Peng, Hao-Hua Deng, Xing-Hua Xia, Wei Chen   +8 more
openaire   +2 more sources

Bimetallic Nickel‐Iridium and Nickel‐Osmium Alloy Nanoparticles and Their Catalytic Performance in Hydrogenation Reactions

ChemCatChem, 2017
AbstractBimetallic NiIr4 and NiOs4 alloy nanoparticles are prepared and studied with regard to their performance in catalytic hydrogenation reactions. NiIr4 and NiOs4 nanoparticles are obtained by oleylamine‐driven reduction and exhibit mean diameters of (8.9±1.3) and (6.8±1.4) nm at low agglomeration.
Egeberg, Alexander, Dietrich, Christine, Kind, Christian, Popescu, Radian, Gerthsen, Dagmar, Behrens, Silke, Feldmann, Claus   +6 more
openaire   +2 more sources

New Approach for Highly Selective Separation and Recovery of Osmium and Rhodium by Using a Nanoparticle Microcolumn

Industrial & Engineering Chemistry Research, 2014
A new solid-phase extraction (SPE) method for recovery of osmium and rhodium was proposed with static batch and column experiments. Nano-Al2O3 exhibited high adsorption ability and selectivity for Os(IV) and Rh(III), and the adsorption depended strongly on pH. Both Os(IV) and Rh(III) could be adsorbed quantitatively on nano-Al2O3 within a pH range of 4.
Fang Wang, Yuejiao Wang, Yanhui Li, Qiong Wang, Xinyu Qi, Lei Zhang   +5 more
openaire   +1 more source

Preparation of Colloidal Nanoparticles of Mixed Metal Oxides Containing Platinum, Ruthenium, Osmium, and Iridium and Their Use as Electrocatalysts

The Journal of Physical Chemistry B, 2003
The hydrolysis of H2PtCl6, RuCl3, OsCl3, and H2IrCl6 under basic conditions in the presence of a water-soluble betaine stabilizer affords aqueous colloidal solutions of the mixed metal oxide PtRuOsIrOx displaying a particle size of 1.3−1.6 nm. The ratio of the four metals can be adjusted by choosing the appropriate relative amounts of metal salts ...
Reetz, M., Lopez, M., Grünert, W., Vogel, W., Mahlendorf, F.   +4 more
openaire   +3 more sources

Enantioselective Dihydroxylation of Alkenes Catalyzed by 1,4‐Bis(9‐O‐dihydroquinidinyl)phthalazine‐Modified Binaphthyl–Osmium Nanoparticles

ChemCatChem, 2017
AbstractA series of unprecedented binaphthyl–osmium nanoparticles (OsNPs) with chiral modifiers were applied in the heterogeneous asymmetric dihydroxylation of alkenes. A remarkable size effect of the OsNPs, depending on the density of the covalent organic shells, on the reactivity and enantioselectivity of the dihydroxylation reaction was revealed ...
Jie Zhu, Xiao‐Tao Sun, Xiao‐Dong Wang, Lei Wu   +3 more
openaire   +1 more source

Use of Ionic Liquids for the Synthesis of Iron, Ruthenium, and Osmium Nanoparticles from Their Metal Carbonyl Precursors

Organometallics, 2008
Stable iron, ruthenium, and osmium nanoparticles are obtained reproducibly by thermal or photolytic decomposition under an argon atmosphere from Fe2(CO)9, Ru3(CO)12, and Os3(CO)12, dissolved in the...
Krämer, Jérôme, Redel, Engelbert, Thomann, Ralf, Janiak, Christoph   +3 more
openaire   +2 more sources

Osmium Carbonyl Clusters on Gold and Silver Nanoparticles as Models for Studying the Interaction with the Metallic Surface

The Journal of Physical Chemistry C, 2009
The surface−cluster interactions between four classes of clusters, viz., (i) those which may be expected to interact directly via the cluster core, (ii) those with a spacer carrying a free thiol functional group, (iii) those with a spacer carrying a free alcohol functional group, and (iv) those with a spacer carrying a free carboxylic acid functional ...
Li, C., Fan, W.Y., Leong, W.K.
openaire   +1 more source

Narrowly dispersed silica supported osmium nanoparticles prepared by an organometallic approach: H2 and CO adsorption stoichiometry and hydrogenolysis catalytic activity

Dalton Transactions, 2013
Osmium(cyclooctadiene)(cyclooctatetraene) is used as a molecular precursor to prepare small and narrowly distributed silica supported nanoparticles upon a mild treatment under H2 (1.1 ± 0.3 nm, ca. 90 atoms). Static volumetric chemisorption combined with HAADF-STEM shows that Os nanoparticles adsorb 1.7 ± 0.1 H and 1.4 ± 0.1 CO per surface atom.
Jia En, Low, Annette, Foelske-Schmitz, Frank, Krumeich, Michael, Wörle, David, Baudouin, Fernando, Rascón, Christophe, Copéret   +6 more
openaire   +2 more sources

Silver-osmium core-shell nanoparticles: Synthesis and heterogeneous persulfate activator

Materials Chemistry and Physics, 2023
Safiyah A. Hejazi, Zoya Zaheer, Samia A. Kosa   +2 more
openaire   +2 more sources

First-principles study of borohydride adsorption properties on osmium nanoparticles and surfaces: understanding the effects of facets, size and local sites

Catal. Sci. Technol., 2014
The first DFT study of borohydride interaction with Os nanoparticles/surfaces, elucidating the effects of facets, size and local sites, is presented.
Mary Clare Sison Escaño, Ryan Lacdao Arevalo, Előd Gyenge, Hideaki Kasai   +3 more
openaire   +1 more source