Author: Virva Kinnunen

0000000001299714

AUTHOR

Virva Kinnunen

showing 9 related works from this author

Optimization of instrumental parameters for improving sensitivity of single particle inductively-coupled plasma mass spectrometry analysis of gold

2021

Single particle inductively-coupled plasma mass spectrometry (spICP-MS) is a promising technique for analysis of engineered nanoparticles, whose utilization has increased substantially over the past years. Optimization of instrumental conditions is, however, crucial to improve the sensitivity and precision of nanoparticle (NP) detection. In this study, the influence of ICP-MS instrumental parameters (nebulizer gas flow, plasma radiofrequency-power and sampling depth) on the signal intensity of gold in spICP-MS was evaluated using dispersions of Au NPs and a solution of dissolved gold. The interaction effects of the main factors were found to have a significant effect on the signal intensity…

AnalytemassaspektrometriaMaterials sciencetutkimuslaitteetAnalytical chemistryMass spectrometry01 natural sciencesSignalAnalytical ChemistryIonoptimointi0103 physical sciencesInstrumentationInductively coupled plasma mass spectrometrymatrix effectSpectroscopy010302 applied physicsDetection limit010401 analytical chemistryAtomic and Molecular Physics and Optics0104 chemical sciencesSpICP-MSParticleinstrumental parametersnanoparticlesnanohiukkasetParticle sizeoptimization

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Gold Nanoparticles on 3D-Printed Filters : From Waste to Catalysts

2019

Three-dimensionally printed solid but highly porous polyamide-12 (PA12) plate-like filters were used as selective adsorbents for capturing tetrachloroaurate from acidic solutions and leachates to prepare PA12–Au composite catalysts. The polyamide-adsorbed tetrachloroaurate can be readily reduced to gold nanoparticles by using sodium borohydride, ascorbic acid, hydrogen peroxide, UV light, or by heating. All reduction methods led to polyamide-anchored nanoparticles with an even size distribution and high dispersion. The particle sizes were somewhat dependent on the reduction method, but the average diameters were typically about 20 nm. Particle sizes were determined by using a combination of…

Materials scienceGeneral Chemical EngineeringNanoparticle02 engineering and technology010402 general chemistry01 natural sciencesArticlekultalaw.inventionSodium borohydridechemistry.chemical_compoundAdsorptionlaw3D-tulostusQD1-999General Chemistry021001 nanoscience & nanotechnologyAscorbic acid0104 chemical sciencesChemistrySelective laser sinteringchemistryChemical engineeringColloidal goldgold nanoparticlesParticlenanohiukkaset3D-printed filters0210 nano-technologyDispersion (chemistry)

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Group 13 complexes of dipyridylmethane, a forgotten ligand in coordination chemistry.

2015

The reactions of dipyridylmethane (dpma) with group 13 trichlorides were investigated in 1 : 1 and 1 : 2 molar ratios using NMR spectroscopy and X-ray crystallography. With 1 : 1 stoichiometry and Et2O as solvent, reactions employing AlCl3 or GaCl3 gave mixtures of products with the salt [(dpma)2MCl2](+)[MCl4](-) (M = Al, Ga) as the main species. The corresponding reactions in 1 : 2 molar ratio gave similar mixtures but with [(dpma)MCl2](+)[MCl4](-) as the primary product. Pure salts [(dpma)AlCl2](+)[Cl](-) and [(dpma)AlCl2](+)[AlCl4](-) could be obtained by performing the reactions in CH3CN. In the case of InCl3, a neutral monoadduct (dpma)InCl3 formed regardless of the stoichiometry emplo…

chemistry.chemical_classificationBoron groupChemistryLigandStereochemistryligandsdipyridylmethaneMethylene bridgeNuclear magnetic resonance spectroscopyliganditMedicinal chemistrydipyridyylimetaaniCoordination complexInorganic ChemistryBipyridinechemistry.chemical_compoundkoordinaatiokemiaDeprotonationcoordination chemistryReactivity (chemistry)ta116Dalton transactions (Cambridge, England : 2003)

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Application of 3D printed scavengers for improving the accuracy of single-particle inductively coupled plasma mass spectrometry analyses of silver na…

2023

The determination of silver nanoparticles (Ag NPs) with single-particle inductively coupled plasma mass spectrometry can be severely interfered with coexisting dissolved silver causing high background signals, which can lead to inaccurate quantification of NP size and particle concentration. In this paper, chemically active and reusable 3D printed scavengers are applied for highly efficient dissolved silver removal in Ag NP dispersions, allowing more accurate determination of particle concentration and size. Selective laser sintering was used for constructing the porous 3D scavengers constituting of polystyrene used as a supporting material and ion-exchange material SiliaBond Tosic acid (TA…

silver nanoparticlesmassaspektrometriaSP-ICP-MSfunctional 3D scavengershopeadispersiot (seokset)3D printingAtomic and Molecular Physics and OpticsAnalytical Chemistryerotusmenetelmätdissolved silver interference3D-tulostusnanohiukkasetInstrumentationSpectroscopySpectrochimica Acta Part B: Atomic Spectroscopy

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