Different concentrations of nickel dimethylglyoxime (DMG) complex were dispersed in polymethyl methacrylate (PMMA) films. PMMA was synthesized by a solution polymerization technique. These films were irradiated with 80 MeV O6+ ions at a fluence of 1 x 1011 ions/cm2. The dielectric properties wer...

Dimethylglyoxime (DMG) is an analytical reagent used to precipitate Ni from its aqueous solution. The process is very efficient for Ni recovery in terms of selectivity and completeness but hardly adopted industrially. The reason is attributed to the loss of the reagent when calcined. The paper o...

This work reports the development of a dimethylglyoxime (DMG) modified sensor in which the complexing agent was successfully immobilized by drop-casting onto a screen-printed carbon electrode support (SPCE). The experimental conditions for the preparation of the DMG-SPCE sensor were optimized by...

2-Amino-4-methoxy-6-methyl-pyrimidine (AMMP) and 2-amino-4,6-dimethyl-pyrimidine (ADMP) react with 2,6-dichloro-4-nitrophenol (DCNP) to form yellow proton transfer (PT) complexes in acetonitrile at absorption maxima around 420 nm. These PT reactions have been applied to the simultaneous spectrop...

A mineralogical characterization was carried out in samples of refractory gold ore with 59 g/ton, according to fire assays, which were taken from a previous leaching process with ammonium thiosulfate. The potential window used to evaluate the cathodic and anodic processes was chosen knowing that...

Three new inorganic-organic hybrid molecular cadmium thiosulfate compounds, [Cd(S2O3) (C3H10N2)2], I, [Cd2(C10H8N2)4(S2O3)2](C10H8N2)·2H2O, II and [Cd2(C10H8N2)2(H2O)2(S2O3)2](C10H8N2)·2H2O, III have been synthesized using different organic linkers as co-ligand and characterized them thoroughl...

Nickel catalyzed ammoniacal thiosulfate leaching-resin adsorption recovery, an environmentally friendly and cost-effective process, was developed to extract gold from a gold concentrate calcine. The catalytic mechanism was presented based on thermodynamic analysis that NH3 catalyzed the anodic d...

We studied the effect of different doses (0.5%, 2% and 5% (w/w)) of ammonium thiosulfate on mercury (Hg) speciation fractionation following its addition to the soil, as well as its accumulation by oilseed rape (Brassica napus L.), corn (Zea mays L.), and sweet potato (Ipomoea batatas L.), and co...

Uniform Er3Al5O12 spheres are of great value for fabricating optical ceramics. The highly monodisperse and size-controllable erbium aluminum garnet (EAG) precursors for transparent ceramics were successfully synthesized through a new microwave process. The precursors constituted of ultrafine par...

Normal and second derivative UV-VIS and normal near-IR spectra of tripositive erbium ion in acetate, nitrate and sulphate solutions of erbium, ammonium, magnesium, potassium and sodium have been investigated. Interaction (E0, E1, E2, E3, ξ4f, α, β, γ, T2, T3, T4, T6, T7, T8) and intensity (Ω...

We have studied the phonon-induced non-radiative decay in erbium doped yttria (Y2O3). The technique employed allows for the evaluation of potential ceramic and crystalline laser materials. The frequency of the dominant phonon that deactivates the fluorescing levels and an approximate prediction ...

Impurity removal is a key stage in the hydrometallurgical processing of rare earth elements (REE), which is performed after water leaching of the acid baked REE concentrate. Lime neutralization is deemed a preferred process due to its high efficiency in the removal of impurities and low reagent ...

A passively mode-locked fiber laser is demonstrated in a cladding pump system using double-clad Erbium-Ytterbium co-doped fiber (EYDF) as a gain medium. A graphene embedded in polyvinyl alcohol (PVA) film is incorporated in a laser cavity with a total length of 217.5 m, and anomalous cavity disp...

Optical absorption spectra of erbium(III) ion in certain sulphate glasses have been studied for the first time in the UV-VIS and NIR regions. From the observed spectra, the spectroscopic parameters such as Racah (Ek), spin-orbit (ξ4f) and configuration interaction (α) parameters have been calc...

A saturable absorber (SA) consisting of a Mo(1−x)WxS2-rGO composite is proposed and fabricated, and its performance demonstrated. The fabricated Mo(1−x)WxS2-rGO has an x composition of 0.2 and is incorporated into a polymer composite thin film. Nonlinear optical characterization of the SA reveal...

This review article is devoted to the materials containing niobium and modified by the addition of different metals or thio- and amino-organosilanes towards the creation of new surface properties and enhancement of catalytic activity. The intention is to show and discuss the role of niobium supp...

Synthesis of lower olefins from biomass is an attractive area of research as the petroleum feedstocks are limited day to day. A fullerene [C60] based niobium phosphate acid catalyst has been tested for isopropanol dehydration in gas phase for production of propylene and a thorough study has been...

Amphiphilic catalysts are synthesized using NbCl5 in the presence of the CTAB (cetyltrimethylammonium bromide) to generate partial hydrophobicity to the catalysts. The partial hydrophobicity of the niobium oxyhydroxides improved the acetalization reaction of a residual glycerol from biodiesel pr...

This article examines the photoproduction of bromine by UV–vis light irradiation in the presence of niobium pentachloride in methanol media, under aerobic conditions. The reaction of tetraphenylphosphonium bromide with niobium pentachloride in methanol, thus, produced the corresponding tribromi...

Quinoxaline based azine derivatives (NN1 and NN2) were synthesized from ninhydrin and sensing studies of the receptors were performed with various cations and anions. NN1 and NN2 showed highly selective colour change from orange/yellow to violet/blue respectively for copper ions. Bathochromic sh...