The synthesis of core-shell [email protected] nanoparticles is of interest for many applications including electrorheology and inkjet printing. Formation of such structures by simple adsorption of aniline onto silica surfaces followed by polymerization is rather difficult. Chemical grafting of a...

Strong persistent luminescence (PeL) from silica bodies was obtained, for the first time, by sintering silica powder mixed with PeL SrAl2O4:Eu2+,Dy3+ microparticles (MPs). We show that it is not possible to prepare transparent PeL silica glass due to the decomposition of the MPs, which occurs al...

Monolithic mechanically reinforced CNTs-silica aerogel composites have been successfully synthesized by two-step sol-gel methodology, using methyltrimethoxysilane as the main silica precursor, combined with an ecofriendly ethanol/water mixture as solvent, and dried at ambient pressure. For an ef...

In New Zealand and internationally, two deleterious constituents in geothermal fluids are silica and arsenic. Silica because scaling is a significant limiting factor for effective geothermal energy production and arsenic due to its potential groundwater contamination. Electrocoagulation treatmen...

Although surface nanostructures greatly influence the optical and wetting properties of transparent materials, preparing such nanostructures efficiently can be challenging because most processes require sophisticated lithography and etching steps. In this study, we developed a simple, yet effect...

Mesoporous silica has garnered a lot of attention since its discovery and this is due to their interesting properties such as high surface area, tunable pore size and facile functionalization. All these properties can be varied through its templates and synthesis parameters. Two of the most comm...

In this work, we prepared the mechanically strong and highly insulated composite of the silica aerogel/glass fiber by adding fumed silica. The composite was made by acid-base catalyzed tetraethyl orthosilicate sol-gel, to which the fumed silica was added, followed by supercritical CO2 drying tec...

Gold nanoparticles in the cores coated by non-porous silica shells ([email protected]2) and by porous silica shells ([email protected]2) were synthesized and used to catalyze the reduction and oxidation reactions to understand the influence of the structure of silica shells on their catalytic ac...

This paper is devoted to an investigation of the copolymerization of the glycidyl esters (GE) of p-isoprepenylphenol (PIPh) and 2-methyl-4-isopropenylphenol with styrene in bulk in the presence of tertiary butyl peroxide and azo-bisisobutyronitrile. Copolymerization constants are presented. The ...

The thermal decomposition of lanthanum, cerium (III), praseodymium, neodymium, samarium, gadolinium, dysprosium, holmium, erbium, ytterbium, and yttrium sulphate hydrates was studied on the thermobalance. The formation of intermediate hydrates was more pronounced with the lighter rare earth elem...

Lanthanum(III) and praseodymium(III) complexes with dithiocarbamates have been synthesized by the reactions of lanthanum(III) and praseodymium(III) chloride with barium dithiocarbamate and complexes of type [LnCl(L)H2O]n have been obtained (where Ln = La(III) or Pr(III); L = barium salt of dithi...

In NiMH battery leaching, rare earth element (REE) precipitation from sulfate media is often reported as being a result of increasing pH of the pregnant leach solution (PLS). Here we demonstrate that this precipitation is a phenomenon that depends on both Na+ and SO42− concentrations and not sol...

The deportment of all the rare earth elements (REE) during the precipitation of ferrihydrite was investigated by pumping ferric sulphate solutions into a REE-containing solution at 75 °C. At a pH of 3.5, controlled by NaOH additions, increasing concentrations of the light rare earths in the 0 t...

Goethite (α-FeOOH) precipitation is an effective means of removing iron in a filterable form from processing solutions, and the behaviour of the rare earths during goethite precipitation was investigated. Increasing concentrations of the light rare earth ions, to 10 g/L, yielded precipitates ha...

The electron paramagnetic resonance of Gd3+ in single crystal of Pr2(SO4)3.8H2O is studied at room temperature. Two magnetic complexes exhibiting orthorhombic or lower symmetry are found and the results have been fitted to a suitable spin Hamiltonian. The exact solution of Hamiltonian matrix is ...

A thermodynamic model has been developed for calculating the phase behavior and caloric properties of rare earth elements in multicomponent sulfate solutions over wide ranges of temperature (up to 300 °C) at concentrations extending to solid–liquid saturation. The model has been constructed us...

The conventional hydrometallurgical process routes for the recovery of rare earth elements (REEs) from ores employs sulfuric acid. After being leached, the rare earth sulfate liquor presents impurities that need to be removed before they can be used in the production of marketable products. In t...

Algal (Laminaria digitata) beads and algal foams have been prepared by a new synthesis mode and the sorbents were tested for praseodymium sorption in batch and fixed-bed like systems (recirculation or one-pass modes), respectively. Metal binding occurs through ion-exchange with Ca(II) ions used ...

A small quantity of Rh2(O2CC7H15)4 (2.5 mol % to 0.6 mol %) catalyzed the α-amidation of cyclic ethers under mild conditions, 35 °C, in the presence of electron-withdrawing p-chlorobenzenesulfonamide/PhI(OAc)2 as the nitrene source, in CH2Cl2 for 4 h. The corresponding N-substituted amino cycl...

Multi-dose formulation of biopharmaceuticals contains an antimicrobial preservative, which may facilitate aggregation of the proteins due to their hydrophobic protein binding. Here, we have investigated the effects of co-solvents on heat-induced protein aggregation in the presence of an antimicr...