نتایج جستجو برای: differential co precipitation

تعداد نتایج: 665619  

Journal: :Journal of the Japan Institute of Metals and Materials 1990

Journal: :Crystals 2021

In this research, we investigate and discuss the characteristics of HoFeO3 nanoparticles synthesized by co-precipitation method at low temperature (t° ? 4 °C). The single-phase samples with orthorhombic structure formed after annealing precipitates different temperatures up to 950 °C. annealed have an average crystal size 10–20 nm (SEM, TEM). UV-Vis spectrum sample 750 °C showed strong UV Vis a...

Journal: :international journal of nanoscience and nanotechnology 2015
s. l. sharifi m. h. hosseini a. mirzaei a. salmani oskuloo

the special application of iron-manganese oxide nanocatalysts has been investigated in decomposition of hydrogen peroxide. in this research, iron-manganese oxide nanocomposites were synthesized by co-precipitation, sol-gel and mechanochemical methods using iron (iii) nitrate, iron (ii) sulfate and manganese (ii) nitrate as starting materials. these nanocomposites were prepared on the various ca...

A. Shokuhfar, H. Arabi, S. Ahmadi, S. Nouri,

Abstract: Guinier-Preston (GP) zone formation and precipitation behavior of T1 (Al2CuLi) phase during the ageingof an Al-Cu-Li-Zr alloy was studied by differential scanning calorimetry (DSC) technique and electrical resistancemeasurement of the samples. Results show that endothermic effects in the thermograms of the alloy between 180°Cand 240°C can be related to the enthalpy of GPzones dissolut...

2011
Garay Hernando

The objective of this work has been the co-precipitation of the coating material Ethyl Cellulose (EC) and two natural extracts (IDOKI SCF Technologies), R1 and P1, using the Supercritical Antisolvent (SAS) precipitation technique with supercritical carbon dioxide (SC-CO2), in order to obtain active microparticles. EC is a hydrophobic material widely used for controlled delivery systems, sustain...

2015
H. Dahlgren B. S. Lanchester N. Ivchenko

High resolution multi-monochromatic measurements of auroral emissions have revealed the first optical evidence of co-existing small-scale auroral features resulting from separate high and low energy populations of precipitating electrons on the same field line. The features exhibit completely separate motion and morphology. From emission ratios and ion chemistry modeling, the average energy and...

Journal: :Environmental geochemistry and health 2011
Jihoon Cha Mingcan Cui Min Jang Sang-Hyun Cho Deok Hyun Moon Jeehyeong Khim

This study examines the adsorption isotherms, kinetics and mechanisms of Pb²(+) sorption onto waste cow bone powder (WCBP) surfaces. The concentrations of Pb²(+) in the study range from 10 to 90 mg/L. Although the sorption data follow the Langmuir and Freundlich isotherm, a detailed examination reveals that surface sorption or complexation and co-precipitation are the most important mechanisms,...

2017
James S. Hayward Paul J. Smith Simon A. Kondrat Michael Bowker Graham J. Hutchings

Catalysts for methanol synthesis from CO2 and H2 have been produced by two main methods: co-precipitation and supercritical anti-solvent (SAS) precipitation. These two methods are compared, along with the behaviour of copper supported on Zn, Mg, Mn, and Ce oxides. Although the SAS method produces initially active material with high Cu specific surface area, they appear to be unstable during rea...

In this research effect of synthesis method of magnesium aluminate as support of Ni catalysts at the reverse water gas shift (RWGS) reaction was evaluated. The RWGS reaction is applied in Carbon Dioxide Hydrogenation to Form Methanol via a Reverse Water-Gas Shift Reaction (CAMERE) process for the transformation of CO2 into methanol. The MgAl2O4 supports were prepared by sol-gel (M1), surfactant...

2012
Tsigabu A Gebrehiwet George D Redden Yoshiko Fujita Mikala S Beig Robert W Smith

BACKGROUND A proposed strategy for immobilizing trace metals in the subsurface is to stimulate calcium carbonate precipitation and incorporate contaminants by co-precipitation. Such an approach will require injecting chemical amendments into the subsurface to generate supersaturated conditions that promote mineral precipitation. However, the formation of reactant mixing zones will create gradie...

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