Effect of Influencing Factors in the Sonochemical Synthesis of Gamma Iron Oxide and its Gas Sensing Property

2011 ◽  
Author(s):  
Ramesh Chandra Biswal ◽  
Ananta Prasad Chakraverty
Keyword(s):  
Iron Oxide ◽  
Influencing Factors ◽  
Gas Sensing ◽  
Sonochemical Synthesis ◽  
Gamma Iron

Sonochemical Synthesis of Functionalized Amorphous Iron Oxide Nanoparticles

Langmuir ◽  
2001 ◽  
Vol 17 (16) ◽  
pp. 5093-5097 ◽  
Author(s):  
Kurikka V. P. M. Shafi ◽  
Abraham Ulman ◽  
Xingzhong Yan ◽  
Nan-Loh Yang ◽  
Claude Estournès ◽  
...  
Keyword(s):  
Iron Oxide ◽  
Iron Oxide Nanoparticles ◽  
Oxide Nanoparticles ◽  
Sonochemical Synthesis ◽  
Amorphous Iron

Direct deposition of highly coercive gamma iron oxide thin films for magnetic recording

1993 ◽  
Vol 74 (11) ◽  
pp. 7019-7021 ◽  
Author(s):  
Sandip Dhara ◽  
A. C. Rastogi ◽  
B. K. Das
Keyword(s):  
Thin Films ◽  
Iron Oxide ◽  
Magnetic Recording ◽  
Oxide Thin Films ◽  
Gamma Iron ◽  
Direct Deposition

scholarly journals Enhanced Cancer Cell (HeLa) Killing Efficacy of Mixed Αlpha and Gamma Iron Oxide Superparamagnetic Nanoparticles under Combined AC (Alternating Current) Magnetic-Field and Photoexcitation

1970 ◽  
Vol 12 (4) ◽  
Author(s):  
Md. Shariful Islam, Yoshihumi Kusumoto, Md. Abdulla Al-Mamun And Yuji Horie
Keyword(s):  
Magnetic Field ◽  
Iron Oxide ◽  
Hela Cells ◽  
Room Temperature ◽  
Heat Dissipation ◽  
Alternating Current ◽  
Superparamagnetic Nanoparticles ◽  
Gamma Iron ◽  
Ac Magnetic Field ◽  
Current Magnetic Field

We synthesized mixed α and γ-Fe2O3 nanoparticles and investigated their toxic effects against HeLa cells under induced AC (alternating current) magnetic-fields and photoexcited conditions at room temperature. The findings revealed that the cell-killing percentage was increased with increasing dose for all types of treatments. Finally, 99% cancer cells were destructed at 1.2 mL dose when exposed to combined AC magnetic-field and photoexcited conditions (T3) whereas 89 and 83 % of HeLa cells were killed under only AC magnetic-field induced (T1) or only photoexcited (T2) condition at the same dose.ABSTRAK: Campuran α dan zarah γ-Fe2O3 bersaiz nano disintesiskan dan kesan toksidnya terhadap sel HeLa dikaji dibawah aruhan medan magnet arus ulang-alik (alternating current (AC)) dan keadaan photoexcited (proses ransangan atom atau molekul suatu bahan dengan penyerapan tenaga sinaran) pada suhu bilik. Penemuan mendedahkan bahawa peratusan sel yang musnah bertambah dengan pertambahan dos untuk semua jenis rawatan. Akhirnya, 99% sel kanser dimusnahkan pada kadar dos 1.2mL setelah didedahkan terhadap kombinasi medan magnet AC dan keadaan photoexcited (T3) dimana 89% dan 83% sel HeLa dimusnahkan dengan hanya di bawah aruhan medan magnet AC (T1) atau hanya pada keadaan photoexcited (T2) pada kadar dos yang sama.KEY WORDS : Cancer, Hyperthermia, Iron oxide nanoparticles, Heat dissipation,    Cytotoxicity, HeLa cell.

scholarly journals Wet chemistry route for the decoration of carbon nanotubes with iron oxide nanoparticles for gas sensing

2019 ◽  
Vol 10 ◽  
pp. 105-118 ◽  
Author(s):  
Hussam M Elnabawy ◽  
Juan Casanova-Chafer ◽  
Badawi Anis ◽  
Mostafa Fedawy ◽  
Mattia Scardamaglia ◽  
...  
Keyword(s):  
Carbon Nanotubes ◽  
Iron Oxide ◽  
Iron Oxide Nanoparticles ◽  
Gas Sensing ◽  
Oxide Nanoparticles ◽  
Silicon Substrates ◽  
Iron Salt ◽  
Multiwalled Carbon ◽  
Wet Chemistry ◽  
Gas Sensing Properties

In this work, we investigated the parameters for decorating multiwalled carbon nanotubes with iron oxide nanoparticles using a new, inexpensive approach based on wet chemistry. The effect of process parameters such as the solvent used, the amount of iron salt or the calcination time on the morphology, decoration density and nanocluster size were studied. With the proposed approach, the decoration density can be adjusted by selecting the appropriate ratio of carbon nanotubes/iron salt, while nanoparticle size can be modulated by controlling the calcination period. Pristine and iron-decorated carbon nanotubes were deposited on silicon substrates to investigate their gas sensing properties. It was found that loading with iron oxide nanoparticles substantially ameliorated the response towards nitrogen dioxide.

Hydrothermal doping of cobalt and magnetic properties in gamma iron oxide thin films

1997 ◽  
Vol 31 (3-6) ◽  
pp. 247-250 ◽  
Author(s):  
Qianwang Chen ◽  
X-G. Li ◽  
Y.T. Qian ◽  
Y.H. Zhang
Keyword(s):  
Thin Films ◽  
Magnetic Properties ◽  
Iron Oxide ◽  
Oxide Thin Films ◽  
Gamma Iron

scholarly journals Photochemistry Aspects of the Laser Pyrolysis Addressing the Preparation of Oxide Semiconductor Photocatalysts

2008 ◽  
Vol 2008 ◽  
pp. 1-11 ◽  
Author(s):  
R. Alexandrescu ◽  
I. Morjan ◽  
F. Dumitrache ◽  
M. Scarisoreanu ◽  
I. Soare ◽  
...  
Keyword(s):  
Iron Oxide ◽  
Gas Phase ◽  
Anatase Phase ◽  
Iron Pentacarbonyl ◽  
Oxide Semiconductor ◽  
Iron Oxide Particles ◽  
Gamma Iron ◽  
Laser Pyrolysis ◽  
Synthesis Of Nanoparticles ◽  
Versatile Tool

The laser pyrolysis is a powerful and a versatile tool for the gas-phase synthesis of nanoparticles. In this paper, some fundamental and applicative characteristics of this technique are outlined and recent results obtained in the preparation of gamma iron oxide (γ-Fe2O3) and titania (TiO2) semiconductor nanostructures are illustrated. Nanosized iron oxide particles (4 to 9 nm diameter values) have been directly synthesized by the laser-induced pyrolysis of a mixture containing iron pentacarbonyl/air (as oxidizer)/ethylene (as sensitizer). Temperature-dependent Mossbauer spectroscopy shows that mainly maghemite is present in the sample obtained at higher laser power. The use of selectedFe2O3samples for the preparation of water-dispersed magnetic nanofluids is also discussed.TiO2nanoparticles comprising a mixture of anatase and rutile phases were synthesized via the laser pyrolysis ofTiCl4- (vapors) based gas-phase mixtures. High precursor concentration of the oxidizer was found to favor the prevalent anatase phase (about 90%) in the titania nanopowders.

Production and characterization of titanium and iron oxide nano-sized thin films

2001 ◽  
Vol 16 (6) ◽  
pp. 1559-1564 ◽  
Author(s):  
E. Comini ◽  
G. Sberveglieri ◽  
M. Ferroni ◽  
V. Guidi ◽  
C. Frigeri ◽  
...  
Keyword(s):  
Thin Films ◽  
Iron Oxide ◽  
Gas Sensing ◽  
Iron Concentration ◽  
Radio Frequency Sputtering ◽  
Electron Microscopy Analysis ◽  
Microscopy Analysis ◽  
Reproducible Method

We present a simple and reproducible method to obtain TiO2 and Fe2O3 mixed-oxide thin films by reactive radio-frequency sputtering. The influence of iron concentration on the structural properties of the layers has been studied. Structural characterization, carried out by electron microscopy analysis, allowed one to correlate the inhibition of the grain growth of titania to the presence of iron oxide and to its segregation at grain boundaries. This behavior should be ascribed to a superficial-tension phenomenon. As a possible application of these thin films, we have investigated the gas-sensing properties toward CO, with particular focus on the role of Fe. The layers were capable to sense CO down to the level requested for environmental monitoring.

Sign in / Sign up

Export Citation Format

Share Document