PHOTOACOUSTICS AND MAGNETIC STUDIES OF Fe3O4 NANOPARTICLES

2010 ◽  
Vol 09 (03) ◽  
pp. 243-250 ◽  
Author(s):  
N. RAJKUMAR ◽  
D. UMAMAHAESWARI ◽  
K. RAMACHANDRAN
Keyword(s):  
Thermal Conductivity ◽  
Particle Size ◽  
Magnetic Properties ◽  
Fe3o4 Nanoparticles ◽  
Room Temperature ◽  
Reduction Method ◽  
Chemical Reduction ◽  
Chemical Reduction Method ◽  
Magnetic Studies

Fe3O4 nanoparticles of size 10 and 12 nm were synthesized by chemical reduction method and characterized for their structural, optical, thermal and magnetic properties at room temperature. Photoacoustic analysis shows a reduction in thermal conductivity atleast by one order from the bulk but within the nanoregime, thermal conductivity increases with decreasing particle size. VSM measurements indicate superparamagnetism in Fe3O4 nanoparticles.

scholarly journals Rod-Shaped Magnetite Nano/Microparticles Synthesis at Ambient Temperature

2013 ◽  
Vol 2013 ◽  
pp. 1-6 ◽  
Author(s):  
Balaprasad Ankamwar ◽  
Ashwini Thorat
Keyword(s):  
Magnetic Properties ◽  
Room Temperature ◽  
Reduction Method ◽  
Colloidal Solution ◽  
Chemical Reduction ◽  
Capping Agent ◽  
Chemical Reduction Method ◽  
Temperature Synthesis ◽  
Mri Contrast ◽  
Average Aspect Ratio

Here, we reported room temperature synthesis of Fe3O4rod-shaped nano/microparticles by chemical reduction method from FeCl3precursor and NaBH4as the reducing agent in the presence of the pyrrole as a capping agent. The magnetic Fe3O4particles were characterized by several methods, such as SEM, XRD, FTIR, and TGA. The average aspect ratio of Fe3O4rod-shaped particles was ~2.8. These particles were redispersed in deionised water to form a colloidal solution and showed magnetic properties. This economical synthesis route is scalable, and Fe3O4particles can be exploited for various applications such as MRI contrast enhancement, biodiseperations, Ni-Fe batteries, and as a catalyst.

scholarly journals Efficient water oxidation with amorphous transition metal boride catalysts synthesized by chemical reduction of metal nitrate salts at room temperature

RSC Advances ◽  
2017 ◽  
Vol 7 (52) ◽  
pp. 32923-32930 ◽  
Author(s):  
Yisu Yang ◽  
Linzhou Zhuang ◽  
Thomas E. Rufford ◽  
Shaobin Wang ◽  
Zhonghua Zhu
Keyword(s):  
Transition Metal ◽  
Water Oxidation ◽  
Room Temperature ◽  
Reduction Method ◽  
Chemical Reduction ◽  
Metal Nitrate ◽  
Metal Boride ◽  
Chemical Reduction Method ◽  
Highly Active ◽  
Metal Borides

We present a variety of amorphous transition-metal borides prepared at room temperature by a chemical reduction method as highly active catalysts for the oxygen evolution reaction (OER).

Carbon Nanotube/CdS Core–Shell Nanowires Prepared by a Simple Room-Temperature Chemical Reduction Method

2004 ◽  
Vol 16 (1) ◽  
pp. 84-87 ◽  
Author(s):  
J. Cao ◽  
J.-Z. Sun ◽  
J. Hong ◽  
H.-Y. Li ◽  
H.-Z. Chen ◽  
...  
Keyword(s):  
Carbon Nanotube ◽  
Room Temperature ◽  
Reduction Method ◽  
Chemical Reduction ◽  
Core Shell ◽  
Chemical Reduction Method ◽  
Shell Nanowires

Liquid-Phase Selective Hydrogenation of Nitrobenzene over Ultrasonic-Assisted Ni-Mo-P Amorphous Catalyst

2012 ◽  
Vol 550-553 ◽  
pp. 420-423 ◽  
Author(s):  
Qian Wen Dai ◽  
Zi Li Liu ◽  
Cui Xia Xu ◽  
Qi Gang Xie ◽  
Fan Zhang ◽  
...  
Keyword(s):  
Particle Size ◽  
Liquid Phase ◽  
Selective Hydrogenation ◽  
Active Sites ◽  
Reduction Method ◽  
Chemical Reduction ◽  
Catalytic Performance ◽  
Chemical Reduction Method ◽  
Ultrasonic Assisted ◽  
Optimal Reaction

The Ni-Mo-P amorphous catalysts were prepared by chemical reduction method under different sonication conditions. The catalytic performance of the prepared catalysts in selective hydrogenation of nitrobenzene(NB) to aniline(AN) were characterized by XRD, BET, N2-adsorption, H2-TPR and H2-TPD. The results show that the introduction of ultrasonic can improve the dispersion of the active sites in the catalyst, the particle size of the catalyst is also smaller than the regular prepared Ni-Mo-P amorphous catalyst. And the influences of the sonication power and time on the catalysts were discussed and compared. The optimal sonication condition is 70 W within 25 min, its optimal reaction time is 150 min.

Phase diagram and structural evolution of tin/indium (Sn/In) nanosolder particles: from a non-equilibrium state to an equilibrium state

Nanoscale ◽  
2017 ◽  
Vol 9 (34) ◽  
pp. 12398-12408 ◽  
Author(s):  
Yang Shu ◽  
Teiichi Ando ◽  
Qiyue Yin ◽  
Guangwen Zhou ◽  
Zhiyong Gu
Keyword(s):  
Heat Treatment ◽  
Phase Diagram ◽  
Equilibrium State ◽  
Room Temperature ◽  
Reduction Method ◽  
Chemical Reduction ◽  
Structural Evolution ◽  
Chemical Reduction Method ◽  
Post Synthesis ◽  
Surfactant Assisted

Tin/indium (Sn/In) nanosolder particles, synthesized by a surfactant-assisted chemical reduction method at room temperature, were not in an equilibrium state; however, the equilibrium state was effectively attained through post-synthesis heat treatment.

Carbon Nanotube/CdS Core—Shell Nanowires Prepared by a Simple Room-Temperature Chemical Reduction Method.

ChemInform ◽  
2004 ◽  
Vol 35 (13) ◽  
Author(s):  
Jian Cao ◽  
Jing-Zhi Sun ◽  
Jian Hong ◽  
Han-Ying Li ◽  
Hong-Zheng Chen ◽  
...  
Keyword(s):  
Carbon Nanotube ◽  
Room Temperature ◽  
Reduction Method ◽  
Chemical Reduction ◽  
Core Shell ◽  
Chemical Reduction Method ◽  
Shell Nanowires

scholarly journals Core-shell SiO2/Ag composite spheres: synthesis, characterization and photocatalytic properties

2016 ◽  
Vol 34 (4) ◽  
pp. 806-810 ◽  
Author(s):  
Zhi Gang Wu ◽  
Yan Rong Jia ◽  
Jian Wang ◽  
Yang Guo ◽  
Jian Feng Gao
Keyword(s):  
Room Temperature ◽  
Reduction Method ◽  
Chemical Reduction ◽  
Photocatalytic Properties ◽  
Core Shell ◽  
Chemical Reduction Method ◽  
X Ray ◽  
Vis Spectroscopy ◽  
Photocatalytic Activities ◽  
Degradation Of Methyl Orange

AbstractCore-shell SiO2/Ag composite spheres with dense, complete and nanoscaled silver shell were prepared by using a novel facile chemical reduction method without surface modification of silica at room temperature. The core-shell composites were characterized by X-ray powder diffraction (XRD), scanning electron microscopy (SEM), UV-Vis spectroscopy and energy dispersive X-ray spectroscopy (EDX). The photocatalytic properties towards the degradation of methyl orange (Mo) of the prepared SiO2/Ag composites were also tested. The studies showed that the surface of SiO2 microspheres was homogeneously and completely covered by Ag nanoparticles and the composite exhibited excellent photocatalytic activities. The possible reaction mechanisms for the formation of the silica-silver core-shell spheres were also discussed in this paper.

scholarly journals Synthesis and Comparative Antibacterial Activity of Fatty Acid Capped Silver Nanoparticles

2020 ◽  
Vol 14 (3) ◽  
pp. 1941-1947
Author(s):  
Rama Sharma
Keyword(s):  
Silver Nanoparticles ◽  
Antibacterial Activity ◽  
Fatty Acid ◽  
Room Temperature ◽  
Reduction Method ◽  
Chemical Reduction ◽  
Inert Atmosphere ◽  
Chemical Reduction Method ◽  
Visible Spectroscopy ◽  
E Coli

In the present work, the chemical reduction method has been used to synthesize silver nanoparticles using stearic acid capping agents in different concentrations. These nanoparticles are characterized by ultraviolet-visible spectroscopy and dynamic light scattering (DLS). The size of the synthesized silver nanoparticles found between 80-100 nm and stable up to 5 months. These nanoparticles show a very good bactericidal influence on E. coli and S. aureus. In this method silver nanoparticles have synthesized at room temperature without using any inert atmosphere, this is the advantage of this method over others.

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