نتایج جستجو برای: calcinations

تعداد نتایج: 162  

Journal: :Acta chimica Slovenica 2010
Hamid Reza Pouretedal Marzihe Hosseini

Bleaching of Congo red catalyzed by ZrO2 nanoparticles was study under UV and sunlight irradiations. The nanoparticles of ZrO2 have been synthesized by controlled precipitation method. The concentration of ZrOCl2 and ammonia reactants and the calcinations temperature of ZrO2 were optimized for the control of nanoparticles size. Characterization of the prepared nanoparticles was studied by using...

2012
O. A. Ajayi

Synthesis of zeolite from kaolinite clay is a very promising process, requiring thorough beneficiation and calcinations to obtain purer monomer. Kaolinite clay sourced from Kankara, Nigeria is associated with inherent impurities, making its transformation rather challenging. The addition of dye, though, assisted in inhibiting the negative effects of impure phases on the desired end products and...

2015
Li Li Nian Tang Yaxue Wang Wanglai Cen Jie Liu Yongyan Zhou

Moisture control is an important part of effective maintenance program for gas-insulated switchgear (GIS). Herein, hexagonal mesoporous silica (HMS) materials were synthesized by adopting dodecylamine as a structure directing agent, which was then employed as a host for supporting polyethylenimine (PEI) without further calcinations or extraction treatment. The physicochemical properties of the ...

Journal: :international journal of nanoscience and nanotechnology 2012
s. z. mohammadi m. khorasani-motlagh sh. jahani m. yousefi

α-fe2o3 (hematite) is the most stable iron oxide under ambient conditions. this transition metal oxide has been extensively investigated because it has unique electrical and catalytic properties. in this report, a novel microwave method for preparation of α-fe2o3 nanoparticles has been developed. the process contained two steps: first, precursor were obtained from a mixed solution of 50 ml of 0...

Journal: :journal of nanostructures 2012
s. asadi h. abdizadeh y. vahidshad

the stabilized zirconia with different cu contents synthesized via sol-gel method. the samples were prepared by hydrolysis and condensation of orgnomatelic sol. after that the result gels were dried at 80 °c and then calcined at various temperatures.  ِ the differential thermal analysis (dta), x-ray diffraction (xrd), field emission scanning electronic microscopy (fesem) and transmission electro...

Journal: :Nucleation and Atmospheric Aerosols 2022

Chicken eggs are the most important cooking ingredient with rich protein and calcium. It can be consumed by all humans eggshells disposed as a waste material to environment. These materials directly in environment without any pre-treatment which creates environmental pollution its microbial action. Nowadays, researchers converting these into valuable biomaterials. More than 2.2 million people w...

Journal: :international journal of nano dimension 0
afshin pourahmad department of chemistry, rasht branch, islamic azad university, rasht, iran.

molecular sieves mcm-41 were synthesized from rice husk ash (rha) as alternative sources of silica. the material was synthesized by a room temperature method from a gel with the molar composition sio2: 1.6ea: 0.215hdtmabr: 325h2o with ph correction. the cetyltrimethylammonium bromide (ctmabr) was used as a structure template. nanocomposite containing 5.0 and 10.0 wt.% of cu was synthesized unde...

Journal: :international journal of nano dimension 0
sh. moradi chemistry department, north tehran branch, islamic azad university, tehran, iran. s. s. madani chemistry department, north tehran branch, islamic azad university, tehran, iran. g. mahmoudzadeh chemistry department, north tehran branch, islamic azad university, tehran, iran. m. zhalechin chemistry department, north tehran branch, islamic azad university, tehran, iran. s. a. khorrami chemistry department, north tehran branch, islamic azad university, tehran, iran.

the aim of this study is to evaluate the influence of ph on the synthesis of nanocrystallines cobalt ferrite by combination of sol- gel auto combustion and ultrasonic irradiation methods. two different fuels, urea and thiourea, along with metal nitrates (oxidant) were used to prepare cofe2o4 powders. the morphology of the resulting powders was investigated. the powders were characterized by x-r...

2015
Gong Zhou Parag R. Shah Taeyoon Kim Paolo Fornasiero Raymond J. Gorte

The thermodynamic redox properties for a series of ceria–zirconia solid solutions have been measured by determining their oxidation isotherms between 873 and 1073 K. Isotherms were obtained using Coulometric titration and using O2 titration of samples equilibrated in flowing mixtures of H2 and H2O. Samples having the following compositions were studied after calcinations at 973 and 1323 K: CeO2...

2010
Mohmmed Rafiq H. Siddiqui Saad Alshehri Ismail Kh. Warad Naser M. Abd El-Salam Refaat M. Mahfouz

Kinetic studies for the non-isothermal decomposition of unirradiated and γ-irradiated silver acetate with 10(3) kGy total γ-ray doses were carried out in air. The results showed that the decomposition proceeds in one major step in the temperature range of (180-270 °C) with the formation of Ag(2)O as solid residue. The non-isothermal data for un-irradiated and γ-irradiated silver acetate were an...

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