A surfactant-free route was successfully established to synthesize CeO2 single-crystalline nanowires using H2O2 as oxidizer and template agent.
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3D self-assembled polar . non-polar NiO nanoparticles nanoengineered from turbostratic Ni(OH)(NO) and ordered β-Ni(OH) intermediates.
Nanoscale
October 2024
School of Physics Engineering and Technology, University of York, York, UK.
A surfactant-free ammonia and carbamide precursor-modulated engineering of self-assembled flower-like 3D NiO nanostructures based on ordered β-Ni(OH) and turbostratic Ni(OH)(NO) nanoplate-structured intermediates is reported. By employing complementary structural and spectroscopic techniques, fundamental insights into structural and chemical transformations from intermediates to NiO nanoparticles (NPs) are provided. FTIR, Raman and DSC analyses show that the transformation of intermediates to NiO NPs involves subsequent loss of NO and OH species through a double-step phase transformation at 306 and 326 °C corresponding to the loss of free interlayer ions and HO species, respectively, followed by the loss of chemically bonded OH and NO ions.
View Article and Find Full Text PDFSpontaneous Emulsification of Organometallic Complexes Applied to the Synthesis of Nanocapsules Active for H Release from Ammonia-Borane.
Langmuir
August 2024
University of Rennes, CNRS, ISCR-UMR6226, F-35000 Rennes, France.
Article Synopsis
- This study demonstrates the creation of submicron metal nanocapsules through spontaneous emulsification of organometallic precursors, utilizing water, solvent, and metal precursor ratios to produce either stable or metastable emulsions.
- The research focused on transition metals like Au, Pd, and Pt, which formed nanoparticle shells in different morphologies depending on the emulsions used, particularly highlighting a unique Au-Pd structure within a continuous metal shell.
- The resulting water-stable, surfactant-free nanocapsules were evaluated as catalysts, showing promising activity in hydrolyzing ammonia-borane, thus paving the way for using gold colloids in hydrogen release applications.
Single-step synthesis of ternary metal chalcogenides (sf-CuInS2 and sf-CuInSe2) stripped off the organic cover and their use as a catalyst for symmetric Glaser-Hay coupling reactions.
Dalton Trans
May 2024
School of Chemistry, Univeristy of Hyderabad, Gachibowli, Hyderabad 500046, Telangana, India.
Generally, inorganic nano/microparticles produced by chemical routes are covered by organic surfactants or polymers to control their agglomeration during their synthesis. However, these surfactants and polymers negatively affect their catalytic activity because these molecules mask the surface. This work presents the synthesis of surfactant-free CuInS and CuInSe (sf-CuInS2 and sf-CuInSe2) nano/microparticles through simple reactions without surfactant or polymer coatings using LiBH under a thermodynamically favourable condition.
View Article and Find Full Text PDFIn this study, we report the synthesis of PbS particles having dimensions in the quantum-dot regime (13.17 to 26.91 nm) using a cyclohexane:isopropanol:dimethyl-sulfoxide surfactant-free microemulsion (CID-SFME) scheme without a capping agent.
View Article and Find Full Text PDFAlternative routes of surfactant application - An update.
Semin Fetal Neonatal Med
December 2023
Menzies Institute for Medical Research, University of Tasmania, Hobart, Australia; Department of Paediatrics, Royal Hobart Hospital, Hobart, Australia.
Non-invasive modes of respiratory support have been shown to be the preferable way of primary respiratory support of preterm infants with respiratory distress syndrome (RDS). The avoidance of invasive mechanical ventilation can be beneficial for preterm infants in reduction of morbidity and even mortality. However, it is well-established that some infants managed with non-invasive respiratory support from the outset have symptomatic RDS to a degree that warrants surfactant administration.
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