Preparation and investigation of the structural properties of α-Al2O3 nanoparticles using the sol-gel method

2020 ◽  
Vol 29 ◽  
pp. 100531
Author(s):  
Adnan A. Mohammed ◽  
Ziad T. Khodair ◽  
Anees A. Khadom
2021 ◽  
Author(s):  
Amatalkareem Mohammed Al-Jezbi

Abstract This study deals with the synthesis of some physical properties of (CdO/NiO) nanocomposite via Sol-Gel method and their antibacterial activities. The NiO and CdO nanoxides as well as the CdO/NiO oxide mixture were prepared in five samples with different concentrations where the ratio of CdO/NiO was [(1: 0), (3: 1), (1: 1), (1: 3), (0: 1)], by using the gel solution by means of a polyvinyl alcohol solution ( PVA ). The samples were platelimb at (500̊C) for three hours. The structural properties of the prepared oxides resulting from the cracking process were studied. The XRD results showed the presence of pure cadmium oxide diffraction patterns in the sample (S 1 ) as well as pure nickel oxide in the sample (S 5 ), and confirmed the presence of the CdO / NiO oxide mixture in the samples (S 2 , S 3 , S 4 ). The results of XRD also showed, through calculations, that the specific surface area increased with increasing granular size and decreased with decreasing granular size. XRD calculations also showed that the intensity of eruptions decreased as the granular volume increased and, inversely, increased with decreasing granular size.


Author(s):  
H. Brequel ◽  
G.D. Sorarù ◽  
Florence Babonneau ◽  
Dj. Bahloul-Hourlier ◽  
Stefano Enzo

2010 ◽  
Vol 150-151 ◽  
pp. 1325-1329
Author(s):  
Jian Fei Liu ◽  
Zhi Wang ◽  
Yin Sen Ding ◽  
Guo Pu Shi

The composites of Fe/Al2O3 gradient coatings on steel substrate were prepared by spraying and sol-gel method, and the microstructure and performances of the composites were analyzed. The results show that the adhesion strength of Fe/Al2O3 gradient coatings with FeAlNi transitional layers reaches 25.3MPa when the sintering temperature is 1220°C, and the surface hardness of coatings is four times higher than that of steel substrate. The coatings are mainly composed of α-Al2O3, AlFeO3 and NiFe2O4. There is no obvious hole or macro-interface, while some organization similar to the branch appears in the coatings. The bonding of Fe/Al2O3 gradient coatings and steel substrate mainly depends on adsorption, diffusion and chemical combination.


1998 ◽  
Vol 17 (3) ◽  
pp. 221-231 ◽  
Author(s):  
N.E Bogdanchikova ◽  
S Fuentes ◽  
M Avalos-Borja ◽  
M.H Farı́as ◽  
A Boronin ◽  
...  

2020 ◽  
Vol 1000 ◽  
pp. 227-232
Author(s):  
Nurhayati Indah Ciptasari ◽  
Adri Nora ◽  
Lutviasari Nuraini ◽  
Lusiana ◽  
Nono Darsono ◽  
...  

Zirconia (ZrO2) powders doped with cobalt were prepared by sol-gel method using inorganic salt of zirconium (IV) chloride (ZrCl4) as precursor. The amount of cobalt was varied in the range of 4–16% weight percent to study the effect to structural properties. X-ray diffraction (XRD) analysis suggested the resulting phases were zirconium oxide (Baddeleyite) with monoclinic crystal system along with cobalt oxide as secondary phase. The increasing cobalt content caused the XRD peaks to shift into lower angle due to substitution of Zr atom to smaller Co atom in crystal lattice. Scanning electron microscope (SEM) images showed the samples with higher Co content had smoother surface. Generally, the microstructures of Co doped zirconia powders consisted of large agglomerates with small particles on the surface.


1999 ◽  
Vol 312-314 ◽  
pp. 411-416 ◽  
Author(s):  
H. Brequel ◽  
G.D. Sorarù ◽  
Florence Babonneau ◽  
Dj. Bahloul-Hourlier ◽  
Stefano Enzo

Sign in / Sign up

Export Citation Format

Share Document