Ce(3+)- and Eu(3+)-doped YPO(4) nanorods have been prepared at relatively low temperature (120 degrees C). A detailed investigation of the role Ce(3+) concentration up to 10 atom % on luminescence intensity Eu(3+) in has carried out. Phase transformation from a tetragonal hexagonal structure occurs with increasing concentrations, water molecules are also associated during phase transformation. Thermal study shows that can be retained 800 C structure. Interestingly, returns annealing above...

YPO(4) nanoparticles codoped with Eu(3+) (5 at. %) and Bi(3+) (2-10 have been synthesized by a simple coprecipitation method using polyethylene glycol-glycerol mixture, which acts as capping agent. It has found that the incorporation of ions into YPO(4):Eu(3+) lattice induces phase transformation from tetragonal to hexagonal, also significant decrease in luminescence intensity was observed. This is related association water molecules hexagonal nonradiative process surrounding around...

Lanthanide ions (Ln3+ = Eu3+, Dy3+, Tm3+) doped YVO4 and silica coated YVO4:Ln3+ (YVO4:Ln3+@SiO2) nanoparticles have been prepared by a microemulsion route using Cetyl trimethyl ammonium bromide (CTAB)/n-butanol/hexane/water. Average crystallite sizes of annealed at 500 900 °C are found to be ∼30 ∼80 nm, respectively. Successful coating the on core could observed transmission electron microscopy. The silanol group (SiO–H) is present in samples (heated up °C) acts as luminescence quencher....

Sm3+ ion doped tetragonal SnO2 nanoparticles have been synthesized by the polyol method and its concentration annealing effects on photoluminescence properties are studied. The XRD results show changes of lattice parameters with incorporation into host lattices. Fourier transform infrared (FTIR) data indicate formation a Sn–O bond capping ethylene glycol. broad emission peaks observed around 350 to 550 nm attributed from defects or traps present in SnO2. typical there is efficient energy...

CaF2 nanoparticles doped with 1 at. % Eu3+and codoped Mn2+ ions (1, 2, and 3 %) were synthesized at 180 °C by using ethylene glycol as a capping agent solvent medium. The emission spectra of these nanomaterials show two main peaks 590 612 nm after excitation 240 or 394 nm. Enhancement in luminescence is found upon codoping Mn2+. Parts Eu3+ are substituted into Ca2+ sites (having symmetry environment), which reflected the higher probability magnetic dipole transition over that electric...

YVO₄:Eu/Fe₃O₄can be used for optical imaging and hyperthermia in cancer cells.

SnO2:5Tb (SnO2 doped with 5 at% Tb(3+)) nanoparticles were synthesised by a polyol method and their luminescence properties at different annealing temperatures studied. Characterization of nanomaterials was done X-ray diffraction (XRD), Fourier transformation infrared spectroscopy (FTIR), transmission electron microscopy (TEM) vibrating sample magnetometry (VSM). XRD studies indicate that the prepared tetragonal structures. Upon Tb(3+) ion incorporation into SnO2, Sn(4+) changes to Sn(2+)...

A poly(amido amine) (PAMAM) dendrimer has been successfully used for the first time as a linking agent synthesis of luminescent lanthanide based multifunctional nanohybrid (YPO4:Tb3+@Fe3O4). Characterization materials was done by X-ray diffraction (XRD), Fourier transform infrared spectroscopy (FTIR), transmission electron microscopy (TEM), vibrating sample magnetometer (VSM), and thermogravimetric analysis (TGA). The HRTEM images showed spindle shaped YPO4:Tb3+@Fe3O4 in presence PAMAM which...

Synthesis of lanthanide-doped fluoride SrF2:3Dy and SrF2:3Dy@CaF2 nanoparticles with different ratios core to shell (1:0.5, 1:1 1:2) has been carried out by employing ethylene glycol route. X-ray diffraction (XRD) patterns reveal that the structure prepared was cubical shape, which is also evident in TEM images. The size for (SrF2:3Dy) found increase when covered (CaF2). It from Fourier transform infrared spectroscopy (FTIR) successfully controls growth acts as a shape modifier regulating...

Codoping of Li⁺ ions in luminescent CaF₂:3Tb:5Ce nanoparticles more than doubled its intensity.

Abstract The reaction of setoglaucin with cyanide ion exhibits 357 fold catalysis in presence cationic micelles cetyltrimethylammonium bromide and 23 inhibition anionic sodium dodecyl sulfate. effect concentrations detergent, substrate reactant has been investigated. data on the counterions have analysed by model scheme mathematical formulations developed Patel Katiyar [5, 6]. an inhibitory CTAB catalysed following order: N 3 − > NO Br Cl F salt. Similarly SDS inhibited shows increase...

Abstract The alkaline hydrolysis of methyl violet (MV) was studied by spectrophotometric method under pseudo-first-order conditions at 298 K. Cationic surfactant cetyltrimethylammonium bromide (CTAB) catalyzed the reaction. Addition nonionic Triton X-100 (TX-100) exhibited significant influence on CTAB reaction lowering extent catalysis. kinetic data were analyzed Piszkiewicz model positive cooperativity. Linear Hill-type plots generated with indices cooperativity values greater than unity....

Abstract The reactions of stabilized carbonium ions setoglaucin, methyl violet, and ethyl violet with cyanide are largely catalyzed by the cationic micelles cetyltrimethylammonium bromide (CTAB) in aqueous media. Added counterions (anions this case) have strong inhibitory effects on CTAB‐catalyzed following order: N > NO Br − Cl F no salt. been attributed to exchange between added anions reagent (CN ) micellar data analyzed model schemes, mathematical formulations were developed. Various...

The reaction of triphenylmethane dye (ethyl violet) with hydroxyl ion has been investigated in absence and presence micelles. In micellar solutions, the solubilization carbocation is observed. rate constant follows pseudo-first order kinetics respect to nucleophile. sodium dodecyl sulfate (SDS) micelles, an inhibitory effect observed due repulsion nucleophile strongly bound negatively charged SDS aggregate. nonionic surfactant reduces anionic Quantitative analysis data obtained done by...

The halogenodephenylation of Ph 3 ,SnX (X = NCO, NCS, and N ) with IX′ (X′ Cl and/or Br) yielded new 2 Sn(X)X′ PhI. diphenyltin mixed halide pseudohalides have been characterised by elemental analyses, molar conductance, molecular weight, tic data, ir, 1 H nmr spectral studies.Ph Sn(NCS)Br DMSO forms Sn(NCS)Br•2DMSO complex.

The interactions of chloro diphenyltin(iv) O,O'-dialkyl/alkylene dithiophosphates, [(C 6 H 5 ) 2 Sn(Cl){S(S)P(OR) }] and Sn(Cl){S(S)POGO}], (R = C ; G -CH C(H)-CH 3 (CH CH -) with various N-, O- S-donor Lewis bases have yielded new stable molecular adducts. complexes been characterized by IR, 1 31 P NMR spectra. results suggest the presence five- six-coordinated tin atom in case unidentate bidentate respectively.

The reaction of stabilized carbonium ions with hydroxide has been investigated in the micellar media under pseudo-first order conditions. micelles cationic surfactant, CTAB have catalysed reactions whereas anionic SDS inhibited process. kinetic data quantitatively analysed by applying positive cooperativity model enzyme catalysis. effects added counterions also investigated.

A 5 at.% Dy3+ ions doped CaWO4 nanoparticles (CaWO4:5Dy) were synthesized by hydrothermal method using polyethylene glycol (PEG) as solvent medium and capping agent. The phase purity crystalline properties of the prepared obtained from XRD analysis. TEM images revealed that CaWO4:Dy3+ have particles size approximately in range 30-50 nm. magnetic luminescence nanocomposite exhibits a high saturation magnetization. can achieve hyperthermia temperature (42 ºC) short period applying alternating...