scholarly journals Synthesis and Characterization of Neodymium Oxide in Silica Matrix by Solgel Protocol Method

2008 ◽  
Vol 2008 ◽  
pp. 1-4 ◽  
Author(s):  
Surender Duhan ◽  
Paveen Aghamkar ◽  
M. Singh
Keyword(s):  
Rare Earth ◽  
Ftir Spectroscopy ◽  
Structural Changes ◽  
Neodymium Oxide ◽  
Silica Matrix ◽  
Synthesis And Characterization ◽  
Thermal Treatments ◽  
Average Size ◽  
20 Nm

Formation of nanocrystalline rare earth was prepared by solgel route, using tetra-ethoxysilane and Nd (NO3)3 as precursor materials and HCl as a catalyst. The prepared samples were submitted to thermal treatments at temperature 500∘C (5 hours) and 800∘C (10 hours). Structural changes were investigated by XRD, FTIR spectroscopy, and SEM. At 800∘C (10 hours) resulted in the formation of cubic Nd2O3 nanocrystallites with average size ∼ 20 nm.

scholarly journals Synthesis and Characterization of Lead Dibutyl Dithiophosphate Nanoparticles

2021 ◽  
Vol 14 (3) ◽  
pp. 350-359
Author(s):  
Svetlana V. Saikova ◽  
◽  
Dmitriy I. Chistyakov ◽  
Diana I. Saykova ◽  
Yury L. Mikhlin ◽  
...  
Keyword(s):  
Absorption Maximum ◽  
Lead Nitrate ◽  
Synthesis And Characterization ◽  
Optimal Conditions ◽  
Reaction Parameters ◽  
Synthesis Of Nanoparticles ◽  
Composition And Structure ◽  
Average Size ◽  
20 Nm

We examined the interaction of aqueous solutions of lead nitrate and sodium dibutyl dithiophosphate and showed the formation nanoparticles of lead dibutyl dithiophosphate. The effect of reaction parameters on the synthesis of nanoparticles was studied and the optimal conditions for the formation of their stable hydrosols were determined. The obtained products were investigated by methods of optical spectroscopy, dynamic light scattering. The average size of 15–20 nm, but due to the low surface charge, they are combined into larger aggregates. The UV‑vis spectra has absorption maximum at about 320 nm. TEM micrographs and Pb 2p, S2p XAS spectra revealed a composition and structure of the particles. These nanoparticles can play an important role in the flotation of sulfide minerals of nonferrous metals

Synthesis and characterization of Au, Pt supported on graphene aerogel catalysts for CO oxidation at low temperature

2021 ◽  
Vol 11 (1) ◽  
pp. 118-122
Author(s):  
Chuyen Phan Thi ◽  
Hang Tran Thi Thanh ◽  
Phong Pham Nam ◽  
Ha Vu Thi Thu
Keyword(s):  
Low Temperature ◽  
Ambient Temperature ◽  
Co Oxidation ◽  
Pt Nanoparticles ◽  
Molar Ratio ◽  
Synthesis And Characterization ◽  
Graphene Aerogel ◽  
Highly Dispersed ◽  
Average Size

Au, Pt supported on graphene aerogel catalysts (PtAu/rGOA) with molar ratio of Pt and Au of 1:1, and total metal concentration of 5 % were successfully synthesized by hydrothermal method.  The obtained catalysts were characterized by Raman, XRD, XPS, HR-TEM, BET. It revealed that Au and Pt nanoparticles with average size of 3 – 5 nm were highly dispersed on aerogel graphene. The activity of these catalysts was tested  in CO oxidation. The results showed that the conversion of CO at ambient temperature was 100% during 25 minutes. Accordingly, PtAu/rGOA could be considered as a potential catalysts for CO oxidation at low temperature.

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