scholarly journals An efficient synthetic strategy for uniform perovskite core–shell nanocubes NaMgF3:Mn2+,Yb3+@NaMgF3:Yb3+ with enhanced near infrared upconversion luminescence

2018 ◽  
Vol 6 (9) ◽  
pp. 2342-2350 ◽  
Author(s):  
S. Ding ◽  
X. F. Yang ◽  
E. H. Song ◽  
C. L. Liang ◽  
B. Zhou ◽  
...  
Keyword(s):  
Room Temperature ◽  
Near Infrared ◽  
Upconversion Luminescence ◽  
Precipitation Method ◽  
Core Shell ◽  
One Pot ◽  
Synthetic Strategy ◽  
Co Precipitation

Uniform perovskite core–shell nanocubes NaMn1−xMgxF3@NaMgF3 and NaMn1−xMgxF3:Yb3+@NaMgF3:Yb3+ have been successfully synthesized via a facile one-pot co-precipitation method at room temperature.

Preparation and Electrochemical Performance of Mn3O4/GR Composites Electrode Material in Supercapacitors

2019 ◽  
Vol 807 ◽  
pp. 50-56
Author(s):  
Yun Long Zhou ◽  
Zhi Biao Hu ◽  
Li Mei Wu ◽  
Jiao Hao Wu
Keyword(s):  
Room Temperature ◽  
Raw Materials ◽  
Precipitation Method ◽  
Electrochemical Performances ◽  
Manganese Sulfate ◽  
X Ray Diffraction ◽  
X Ray ◽  
Co Precipitation ◽  
A Current ◽  
Discharge Test

Using hydrated manganese sulfate and general type graphene (GR) as raw materials, Mn3O4/GR composite has been successfully prepared by the liquid phase chemical co-precipitation method at room temperature. X-ray diffraction (XRD) was used to investigate the phase structure of Mn3O4powder and Mn3O4/GR composite; The electrochemical performances of the samples were elucidated by cyclic voltammetry and galvanostatic charge-discharge test in 0.5 mol/L Na2SO4electrolyte. The results show that the Mn3O4/GR composite possesses graphene phase and good reversibility; the composite also displays a specific capacitance of 318.8 F/g at a current density of 1 A/g.

One-pot synthesis of ultrasmall β-NaGdF4 nanoparticles with enhanced upconversion luminescence

2019 ◽  
Vol 7 (29) ◽  
pp. 8898-8904 ◽  
Author(s):  
Chunyan Cheng ◽  
Yueshan Xu ◽  
Songtao Liu ◽  
Yuanyuan Liu ◽  
Xian Wang ◽  
...  
Keyword(s):  
Quantum Yield ◽  
Upconversion Luminescence ◽  
Core Shell ◽  
High Quantum Yield ◽  
High Quality ◽  
Shell Nanoparticles ◽  
One Pot ◽  
High Quantum ◽  
One Pot Synthesis ◽  
Core Shell Nanoparticles

High quality β-NaGdYF4:Yb/Er and high quantum yield β-NaGdF4:Yb/Er@β-NaYF4 core shell nanoparticles were synthesized.

scholarly journals Post annealing induced manipulation of phase and upconversion luminescence of Cr3+ doped NaYF4:Yb,Er crystals

RSC Advances ◽  
2019 ◽  
Vol 9 (17) ◽  
pp. 9364-9372 ◽  
Author(s):  
Shivanand H. Nannuri ◽  
Suresh D. Kulkarni ◽  
Subash C. K. ◽  
Santhosh Chidangil ◽  
Sajan D. George
Keyword(s):  
Upconversion Luminescence ◽  
Ion Concentration ◽  
Luminescence Properties ◽  
Precipitation Method ◽  
Post Annealing ◽  
Co Precipitation

Co-dopant (Cr3+ ion) concentration as well as post annealing found to change the structural as well as luminescence properties of Cr3+ ion doped NaY80%F4:Yb17%,Er3% prepared via a co-precipitation method.

THERMODYNAMIC AND KINETIC ANALYSES OF SYNTHESIZING ZrB2@Al(OH)3–Y(OH)3 CORE–SHELL COMPOSITE PARTICLES

2007 ◽  
Vol 14 (01) ◽  
pp. 117-122 ◽  
Author(s):  
JIEGUANG SONG ◽  
LIANMENG ZHANG ◽  
JUNGUO LI ◽  
JIANRONG SONG
Keyword(s):  
High Temperature ◽  
High Performance ◽  
Solubility Product ◽  
Ceramic Materials ◽  
Precipitation Method ◽  
Composite Particles ◽  
Core Shell ◽  
High Temperature Strength ◽  
Co Precipitation ◽  
Shell Composite

ZrB 2 has some excellent performances, but it is easily oxidized at high temperatures to impact the high-temperature strength, which restricts its applied range. To protect from the oxidization and improve the strength of ZrB 2 at high temperature, the surface of ZrB 2 particles is coated with the Al ( OH )3– Y ( OH )3 shell to synthesize ZrB 2@ Al ( OH )3– Y ( OH )3 core–shell composite particles. Through the thermodynamic and kinetic analyses of the heterogeneous nucleation and homogeneous nucleation, the concentration product of precursor ion ( Y 3+ or Al 3+) and OH - (Qi) must be greater than the solubility product (K sp ), respectively; the conditions of Y 3+ and Al 3+ are reached to produce Al ( OH )3– Y ( OH )3 shell on the ZrB 2 surface between the Y 3+ line and the AlO 2- line. Through TEM and XRD analyses, ZrB 2@ Al ( OH )3– Y ( OH )3 core–shell composite particles are successfully synthesized by the co-precipitation method, the shell layer quality is better at pH = 9, which established the foundation for preparing high-performance YAG / ZrB 2 and Al 2 O 3– YAG / ZrB 2 multiphase ceramic materials.

Preparation of Ferromagnetic Manganese Doped Cobalt Ferrite-Silica Core Shell Nanoparticles for Possible Biological Application

2013 ◽  
Vol 334-335 ◽  
pp. 19-25 ◽  
Author(s):  
S. Rostamzadehmansoor ◽  
Mirabdullah Seyed Sadjadi ◽  
K. Zare ◽  
Nazanin Farhadyar
Keyword(s):  
Magnetic Properties ◽  
Room Temperature ◽  
Cobalt Ferrite ◽  
Biomedical Application ◽  
Strong Dependence ◽  
Precipitation Method ◽  
Cell Protein ◽  
Core Shell ◽  
X Ray ◽  
Cell Parameters

Magnetic oxide nanoparticles with proper surface coatings are increasingly being evaluated for clinical applications such as hyperthermia, drug delivery, magnetic resonance imaging, transfection and cell/protein separations. In this work, we investigated synthesis, magnetic properties of silica coated metal ferrite, (CoFe2O4)/SiO2 and manganese doped cobalt ferrite nanoparticles (Mnx-Co1-xFe2O4 with x = 0.02, 0.04 and 0.06)/SiO2 for possible biomedical application. All the ferrites nanoparticles were prepared by co-precipitation method using FeCl3.6H2O, CoCl2.6H2O and MnCl2.2H2O as precursors, and were silica coated by the Stober process in directly ethanol. The composition, phase structure and morphology of the prepared core/shell cobalt ferrites nanostructures were characterized by powder X-ray diffraction (XRD), Fourier Transform infra-red spectra (FTIR), Field Emission Scanning Electron Microscopy and energy dispersive X-ray analysis (FESEM-EDAX). The results revealed that all the samples maintain the ferrite spinel structure. While, the cell parameters decrease monotonically by increase of Mn content indicating that the Mn ions are substituted into the lattice of CoFe2O4. The magnetic properties of the prepared samples were investigated at room temperature using Vibrating Sample Magnetometer (VSM). The results revealed a strong dependence of room temperature magnetic properties on (1) doping content, x; (2) particle size and ion distributions.

scholarly journals Novel iron doped calcium oxalates as promising heterogeneous catalysts for one-pot multi-component synthesis of pyranopyrazoles

RSC Advances ◽  
2017 ◽  
Vol 7 (1) ◽  
pp. 423-432 ◽  
Author(s):  
Kranthi Kumar Gangu ◽  
Suresh Maddila ◽  
Surya Narayana Maddila ◽  
Sreekantha B. Jonnalagadda
Keyword(s):  
Glutamic Acid ◽  
Heterogeneous Catalysts ◽  
Precipitation Method ◽  
One Pot ◽  
Surface Modifier ◽  
Calcium Oxalates ◽  
Iron Doped ◽  
Co Precipitation

The co-precipitation method using a surface modifier, glutamic acid was employed in the design of iron doped calcium oxalates (Fe-CaOx).

Sign in / Sign up

Export Citation Format

Share Document