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Photo-induced microfluidic production of ultrasmall platinum nanoparticles.
Nanoscale
October 2024
CNR-ICCOM, Institute of Chemistry of OrganoMetallic Compounds, Via G. Moruzzi 1, 56124 Pisa, Italy.
We describe here the synthesis of ultrasmall Pt nanoparticles (NPs) obtained by a robust and reliable protocol using UV-Vis photoreduction of a platinum salt precursor, under continuous flow conditions. These ligand-free Pt NPs were rapidly dispersed onto a solid support or stabilized towards aggregation as a colloidal solution by the addition of an appropriate ligand in the reaction mixture. The proposed protocol exploits a microfluidic platform where the Pt precursor is photo-reduced to small Pt NPs (1.
View Article and Find Full Text PDFPlatinum-Iridium Alloy Nanoparticle Coatings Produced by Electrophoretic Deposition Reduce Impedance in 3D Neural Electrodes.
Chemphyschem
September 2024
Technical Chemistry I, University of Duisburg-Essen, Center for Nanointegration Duisburg-Essen (CENIDE), Universitätsstr. 7, 45141, Essen, Germany.
Platinum-based neural electrodes, frequently alloyed with Ir or W, are routinely used to treat neurological disorders. However, their performance is impaired by an increase in impedance that compromises long-term implant functionality. Though there are multiple coating techniques available to address this issue, electrode, and base material often exhibit a compositional mismatch, which impairs mechanical stability and may lead to toxicological side effects.
View Article and Find Full Text PDFUltrasmall Pt NPs-modified flasklike colloidal motors with high mobility and enhanced ion tolerance.
Nanoscale
August 2023
School of Medicine and Health, Harbin Institute of Technology, Yi Kuang Jie 2, Harbin 150080, China.
Chemically powered colloidal motors propelled by the self-phoretic effect have attracted widespread attention. However, the low motion efficiency and ion tolerance hinder their application in complex media. Herein, we report a scalable and simple method to synthesize 2.
View Article and Find Full Text PDFStructural Analysis and Intrinsic Enzyme Mimicking Activities of Ligand-Free PtAg Nanoalloys.
Small
May 2023
Fachbereich Physik, Center for Hybrid Nanostructures (CHyN), Universität Hamburg, 22761, Hamburg, Germany.
Nanozymes are nanomaterials with biocatalytic properties under physiological conditions and are one class of artificial enzymes to overcome the high cost and low stability of natural enzymes. However, surface ligands on nanomaterials will decrease the catalytic activity of the nanozymes by blocking the active sites. To address this limitation, ligand-free PtAg nanoclusters (NCs) are synthesized and applied as nanozymes for various enzyme-mimicking reactions.
View Article and Find Full Text PDFCytotoxic sub-nanometer aqueous platinum clusters as potential antitumoral agents.
Nanoscale Adv
December 2022
Ligand-free sub-nanometer metal clusters (MCs) of Pt, Ir, Rh, Au and Cu, are prepared here in neat water and used as extremely active (nM) antitumoral agents for HeLa and A2870 cells. The preparation just consists of adding the biocompatible polymer ethylene-vinyl alcohol (EVOH) to an aqueous solution of the corresponding metal salt, to give liters of a MC solution after filtration of the polymer. Since the MC solution is composed of just neat metal atoms and water, the intrinsic antitumoral activity of the different sub-nanometer metal clusters can now fairly be evaluated.
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