排序方式: 共有18条查询结果,搜索用时 15 毫秒
1.
Sapana Guru Deepti Mishra Manju Singh Sudhir Sitaram Amritphale Smita Joshi 《Protection of Metals and Physical Chemistry of Surfaces》2016,52(4):627-631
In the present work iron oxide nanoparticles have been prepared by microwave assisted synthesis with the influence of different precursor salts and synthesis of magnetite, hematite, Iron oxide hydroxide and maghemite nanoparticles. Synthesized iron oxide nanoparticles were characterized with Infrared Spectroscopy (FTIR), Field Emission Scanning Electron Microscopy (FESEM), and Energy-dispersive X-ray Spectroscopy (EDX). XRD measurements show that the peaks of diffractogram are in agreement with the theoretical data of magnetite, hematite, FeO(OH) (Iron oxide hydroxide) and maghemite. Crystallite size of the particles was found to be 33, 45, 36 and 43.5 nm for Fe3O4, α-Fe2O3, FeO(OH) and γ-Fe2O3. FESEM studies indicated that size of the particles is observed in the range of about 19.4 to 46.7 nm (Fig. 2a, average 32 nm), 29.1 to 67.6 nm (Fig. 2b average 45 nm), 29.1 to 40.8 (Fig. 2c average 36.6 nm), 29.1 to 80 nm (Fig. 2d average 43.5) for Fe3O4, α-Fe2O3, FeO(OH) and γ-Fe2O3 respectively. EDX spectral analysis reveals the presence of carbon, oxygen, iron in the synthesized nanoparticles. The FTIR graphs indicated absorption bands due to O–H stretching, C–O bending, C–H stretching and Fe–O stretching vibrations. 相似文献
2.
Sarika Verma Mishra Deepti Sanghi S. K. Srivastava A. K. Amritphale S. S. 《Protection of Metals and Physical Chemistry of Surfaces》2019,55(1):65-71
Protection of Metals and Physical Chemistry of Surfaces - We report a facile and reproducible method to synthesize advanced, homogenized, hybrid, nanoflower of thorium oxide and thorium oxalate... 相似文献
3.
4.
Deepti Mishra Ruma Arora Swati Lahiri Sudhir Sitaram Amritphale Navin Chandra 《Protection of Metals and Physical Chemistry of Surfaces》2014,50(5):628-631
In the present work iron oxide nanoparticles have been synthesized by alkaline solvo thermal method using anhydrous ferric chloride, sodium hydroxide, polyethylene glycol and cetyl trimethyl ammonium bromide and characterized by X-ray diffraction (XRD), Fourier Transform Infrared Spectroscopy (FTIR), Field Emission Scanning Electron Microscopy (FESEM), Energy-dispersive X-ray Spectroscopy (EDX) and Thermal Gravimetric Analysis (TGA). XRD indicated that the product is a mixture of different phases of iron oxide viz. gamma-Fe2O3 (maghemite, tetragonal), Fe2O3 (maghemite, cubic), Fe3O4 (magnetite, cubic) and ?-Fe2O3(epsilon iron oxide). FESEM studies indicated that size of the particles is observed in the range of about 19.8 nm to 48 nm. EDX spectral analysis reveals the presence of carbon, oxygen, iron in the synthesized nanoparticles. The FTIR spectra indicated absorption bands due to O-H stretching, C-O bending, N-H stretching and bending, C-H stretching and Fe-O stretching vibrations. TGA curve represented weight loss of around 3.0446 % in the sample at temperature of about 180°C due to the elimination of the water molecules absorbed by the nanoparticles from the atmosphere. 相似文献
5.
Pyrophyllite mineral was heat treated with alkali and alkaline-earth metal carbonates in equimolar ratios at 1000 °C for 2 h and the various phases formed in the sintered products were investigated using X-ray powder diffraction and infrared spectroscopy. The morphology of the products was studied using scanning electron microscopy. In each case formation of aluminosilicate phase of respective cation was observed, but the presence of mullite in sintered products was not detected. 相似文献
6.
Gupta Rainy Bhardwaj Pooja Deshmukh Kumud Mishra Deepti Prasad Murari Amritphale Sudhir S. 《SILICON》2019,11(1):221-232
Silicon - In this study, an innovative one part, solution free concept applied for the development of hybrid inorganic–organic geopolymeric precursors having Si-O-Al networks at the precursor... 相似文献
7.
8.
Sarika Verma S. S. Amritphale Satyabrata Das 《Journal of Materials Engineering and Performance》2017,26(3):1018-1025
For the first time (The patent application no. 201611000546 has been filed in India and USA.), nano-size Functionalized Brine sludge Precursor Material (FBSPM) containing multi-elemental and multi-shielding phases in the desired morphology and size has been synthesized by using conventional as well as microwave heating. It was reacted with polydimethylsiloxane for obtaining tailored hybrid inorganic–organic gel which is necessary for making advanced flexible and moldable x-ray radiation shielding material. The characterization studies of FBSPM confirm: (a) presence of shielding phases by XRD, (b) multi-elemental characteristics by EDS and (c) morphology and nano-size by FESEM. The quadrant of 15 mm thickness of the developed advanced flexible and moldable radiation shielding material has been tested for 30 kVp x-ray attenuation characteristics. Interestingly, it has been identified as providing 90% attenuation. The developed material possesses broad application spectrum ranging from x-ray and CT scanner room to nuclear power plants and other strategic radiation shielding installations. 相似文献
9.
Sharma Rahul Clower William Amritphale Sudhir Alam Shaurav Matthews John Radadia Adarsh D. 《Journal of Materials Science: Materials in Electronics》2022,33(8):4847-4861
Journal of Materials Science: Materials in Electronics - In this study waste from steel industries, namely, mill scale, red dust, and iron ore fines have been used as additives in geopolymer matrix... 相似文献
10.
Pooja Bhardwaj Rainy Gupta Deepti Mishra S. K. Sanghi Sarika Verma Sudhir S. Amritphale 《SILICON》2020,12(3):487-500
The research objectives of this study were to investigate and compare corrosion and fire protective properties of conventional and advanced phosphatic geopolymeric coating on mild steel substrate using spray coating technique For these studies two composition were developed using conventional geopolymerisation route by adding alkali activator solution to fly ash and six compositions were developed using advanced geopolymerisation process in which water was added to solid precursor powder obtained by together co-ginding of raw materials for a period of 8 h. Coated plates were tested for adhesion strength, water resistance, fire protection and corrosion resistance. Results indicated that coating developed from two passes with thickness 100 ± 15 μm showed better adhesion as compared to single pass and also proved to be promising corrosion protective coating material for mild steel substrate under sea water conditions. The developed material is able to withstand flame for more than 45 min and also no cracks were observed in coating by direct heating on liquefied petroleum gas flame. Thus developed phosphatic geopolymeric material is well suited for protecting the mild steel structures from fire and corrosion. 相似文献