Investigation of the thermal stability of Mn ferrite particles synthesized by a modified co-precipitation method

2012 ◽  
Vol 56 (3) ◽  
pp. 568-572 ◽  
Author(s):  
ChunHui Dong ◽  
GaoXue Wang ◽  
Lei Shi ◽  
DangWei Guo ◽  
ChangJun Jiang ◽  
...  
Keyword(s):  
Thermal Stability ◽  
Precipitation Method ◽  
Co Precipitation ◽  
Thermal Stability Of

scholarly journals Zinc stearate from galvanizing waste materials and its use as thermal stabilizer in PVC industries

2016 ◽  
Vol 51 (4) ◽  
pp. 261-270
Author(s):  
FK Rony ◽  
SK Ray ◽  
A Hoque ◽  
M Asaduzzaman ◽  
S Sultana ◽  
...  
Keyword(s):  
Thermal Stability ◽  
Product Yield ◽  
Zinc Stearate ◽  
Waste Materials ◽  
Precipitation Method ◽  
Thermal Stabilizer ◽  
Thermo Gravimetric Analyzer ◽  
Lead Zinc ◽  
Zinc Dross ◽  
Thermal Stability Of

Galvanizing industries of Bangladesh produce profuse amount of environmentally hazardous solid waste materials like zinc dross which contains significant amount of valuable zinc and harmful heavy lead. Zinc was extracted as zinc chloride (ZnCl2) from zinc dross. Zinc stearate (ZnSt2) samples were prepared by precipitation method from stearic acid, sodium hydroxide and ZnCl2 by varying the amount of the reagents and product yield found within the range 96.06-99.18%. Characteristic peaks of ZnSt2 were investigated by Fourier Transform Infrared Spectroscopy (FTIR). Differential Scanning Calorimeter (DSC) onset curve assigned accurate melting point within the range 122.84-124.03°C. Surface morphology of ZnSt2 was observed by Scanning Electron Microscope (SEM) and products had semi-crystalline structure. Thermal stability of ZnSt2 was evaluated by Thermo-gravimetric Analyzer (TGA) that complied with literature. A combination of ZnSt2 and Calcium stearate (CaSt2) at 1:1 ratio was used as thermal stabilizer in the powder commercial grade PVC resin and performed better thermal stability. The dehydrochlorination temperature of PVC with mixed stearates was 344.67±1.04°C for 10% (w/w) loading whereas for PVC, PVC with 10% (w/w) ZnSt2 and PVC with 10% (w/w) CaSt2, it was 269.83±1.04°C, 317.33±1.26°C and 323.33±2.08°C respectively.Bangladesh J. Sci. Ind. Res. 51(4), 261-270, 2016

Carbonate Apatite Bone Replacement

2013 ◽  
Vol 587 ◽  
pp. 17-20 ◽  
Author(s):  
Ishikawa Kunio
Keyword(s):  
Thermal Stability ◽  
Cell Response ◽  
Tissue Response ◽  
Precipitation Method ◽  
Carbonate Apatite ◽  
Inorganic Component ◽  
Bone Replacement ◽  
Thermal Stability Of

Inorganic component of bone is not hydroxyapatite but carbonate apatite. Although pure carbonate apatite (CO3Ap) has not been prepared due to the limited thermal stability of CO3Ap, dissolution - precipitation method using precursor block allows fabrication of pure CO3Ap. Fabrication of CO3Ap, cell response, tissue response and improvement of CO3Ap will be discussed.

A highly-efficient La–MnOx catalyst for propane combustion: the promotional role of La and the effect of the preparation method

2016 ◽  
Vol 6 (23) ◽  
pp. 8222-8233 ◽  
Author(s):  
Yujie Xie ◽  
Yun Guo ◽  
Yanglong Guo ◽  
Li Wang ◽  
Wangcheng Zhan ◽  
...  
Keyword(s):  
Thermal Stability ◽  
Preparation Method ◽  
Deep Oxidation ◽  
Precipitation Method ◽  
Propane Combustion ◽  
Highly Efficient ◽  
Excellent Activity ◽  
Co Precipitation

The La0.4–MnOx catalyst prepared by using the co-precipitation method exhibited excellent activity and thermal stability for propane deep oxidation.

Effect of Mg Content on Thermal Stability of β-Tricalcium Phosphate Ceramics

2014 ◽  
Vol 604 ◽  
pp. 192-195 ◽  
Author(s):  
Kristine Salma-Ancane ◽  
Liga Stipniece ◽  
Zilgma Irbe ◽  
Marina Sokolova ◽  
Guna Krieke ◽  
...  
Keyword(s):  
Thermal Stability ◽  
Chemical Composition ◽  
Tricalcium Phosphate ◽  
Chemical Properties ◽  
Precipitation Method ◽  
Sintering Behavior ◽  
Remarkable Effect ◽  
Mg Content ◽  
Thermal Stability Of

β-Tricalcium phosphate bioceramics with small, close to bone-like amounts of Mg were obtained by modified precipitation method and following sintering. The effect of small amounts of Mg on the thermal stability, microstructure and sintering behavior of β-tricalcium phosphate bioceramics was evaluated. Addition of small amounts of Mg, can induce a remarkable effect on the physic-chemical properties of β-TCP and therefore the chemical composition of the starting materials should be controlled.

scholarly journals Preparation of Ceria-zirconia Mixed Oxides with Improved Thermal Stability for Three-way Catalysts by a Modified Co-precipitation Method

2017 ◽  
Vol 32 (3) ◽  
pp. 331 ◽  
Author(s):  
WU Qing-Feng ◽  
CUI Ya-Juan ◽  
ZHANG Hai-Long ◽  
ZHOU Yi ◽  
LAN Li ◽  
...  
Keyword(s):  
Thermal Stability ◽  
Mixed Oxides ◽  
Precipitation Method ◽  
Co Precipitation

Sr- and/or Mg-Containing Nanocrystalline Hydroxyapatite: Study from Synthesis to Calcined Products

2016 ◽  
Vol 721 ◽  
pp. 167-171
Author(s):  
Liga Stipniece ◽  
Inga Narkevica ◽  
Kristine Salma-Ancane ◽  
Dagnija Loca
Keyword(s):  
Thermal Stability ◽  
Thermal Behavior ◽  
Biologically Active ◽  
Precipitation Method ◽  
Sintering Behavior ◽  
Minor Phase ◽  
Major Phase ◽  
Nanocrystalline Hydroxyapatite ◽  
Deviation From Stoichiometry ◽  
Thermal Stability Of

In this work, nanocrystalline hydroxyapatite (HAp) powders were synthesized through wet precipitation method by adjusting the reaction temperature between 0 °C and 5 °C. The influence of biologically active Mg and Sr addition on HAp crystalline structure and thermal behavior was assessed. In all synthesis, nanocrystalline and/or amorphous HAp was found to be the major phase, and was accompanied by Ca(OH)2 as the minor phase. Results suggested that Sr and Mg have an impending effect on nucleation, crystallization and thermal stability of HAp. The addition of Sr or Mg promoted deviation from stoichiometry and formation of amorphous components, which affected thermal stability and sintering behavior of the synthesis products.

scholarly journals A Rational Design of the Sintering-Resistant Au-CeO2 Nanoparticles Catalysts for CO Oxidation: The Influence of H2 Pretreatments

Materials ◽  
2018 ◽  
Vol 11 (10) ◽  
pp. 1952 ◽  
Author(s):  
Yuqi Sun ◽  
Wei Liu ◽  
Miao Tian ◽  
Liguo Wang ◽  
Zhongpeng Wang
Keyword(s):  
Thermal Stability ◽  
Co Oxidation ◽  
Noble Metal ◽  
Rational Design ◽  
Co Adsorption ◽  
Precipitation Method ◽  
Au Nps ◽  
Metal Support Interaction ◽  
H2 Pretreatment ◽  
Thermal Stability Of

The redox pretreatment of samples is one of the crucial ways of altering the catalytic properties of the supported noble metal materials in many heterogeneous reactions. Here, H2-reducing pretreatment is reported to enhance the thermal stability of Au-CeO2 catalysts prepared by the deposition–precipitation method and calcination at 600 °C for CO oxidation. In order to understand the improved activity and thermal stability, a series of techniques were used to characterize the physico-chemical changes of the catalyst samples. H2 pretreatment may lead to: (i) a strong metal–support interaction (SMSI) between Au nanoparticles (NPs) and CeO2, evidenced by the particular coverage of Au NPs by CeO2, electronic interactions and CO adsorption changes. (ii) the production of surface bicarbonates which can accelerate CO oxidation. As a result, the H2 pretreatment makes the Au NPs more resistant to sintering at high temperature and enhances the CO oxidation activity. Furthermore, this reduction pretreatment strategy may provide a potential approach to enhance the thermal-stability of other supported noble metal catalysts.

scholarly journals Chitin Fiber and Chitosan 3D Composite Rods

2010 ◽  
Vol 2010 ◽  
pp. 1-7 ◽  
Author(s):  
Zhengke Wang ◽  
Qiaoling Hu ◽  
Lei Cai
Keyword(s):  
Thermal Stability ◽  
Bending Strength ◽  
Layer Structure ◽  
Precipitation Method ◽  
Layer By Layer ◽  
Bending Modulus ◽  
Acid Aqueous Solution ◽  
3D Composite ◽  
Thermal Stability Of

Chitin fiber (CHF) and chitosan (CS) 3D composite rods with layer-by-layer structure were constructed by in situ precipitation method. CHF could not be dissolved in acetic acid aqueous solution, but CS could be dissolved due to the different deacetylation degree (D.D) between CHF and CS. CHF with undulate surfaces could be observed using SEM to demonstrate that the sufficiently rough surfaces and edges of the fiber could enhance the mechanical combining stress between fiber and matrix. XRD indicated that the crystallinity of CHF/CS composites decreased and CS crystal plane d-spacing of CHF/CS composites became larger than that of pure CS rod. TG analysis showed that mixing a little amount of CHF could enhance thermal stability of CS rod, but when the content of CHF was higher than the optimum amount, its thermal stability decreased. When 0.5% CHF was added into CS matrix, the bending strength and bending modulus of the composite rods arrived at 114.2 MPa and 5.2 GPa, respectively, increased by 23.6% and 26.8% compared with pure CS rods, indicating that CHF/CS composite rods could be a better candidate for bone fracture internal fixation.

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