Pure and Pt-loaded gamma iron oxide as sensor for detection of sub ppm level of acetone

2011 ◽  
Vol 157 (1) ◽  
pp. 183-188 ◽  
Author(s):  
Ramesh Chandra Biswal
Keyword(s):  
Iron Oxide ◽  
Gamma Iron ◽  
Ppm Level

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.

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.

Magnetic Properties of Chemical Vapour Deposited Cobalt Dope Gamma Iron Oxide Thin Films

1992 ◽  
Vol 31 (Part 1, No. 12A) ◽  
pp. 3853-3857 ◽  
Author(s):  
Sandip Dhara ◽  
Ravinder Kumar Kotnala ◽  
Alok Chandra Rastogi ◽  
Bijoy Kishore Das
Keyword(s):  
Thin Films ◽  
Magnetic Properties ◽  
Iron Oxide ◽  
Chemical Vapour ◽  
Oxide Thin Films ◽  
Gamma Iron

Ultramicrotomy in the Analysis of Magnetic Recording Media

1985 ◽  
Vol 43 ◽  
pp. 212-213
Author(s):  
P. B. Narayan
Keyword(s):  
Iron Oxide ◽  
Cross Sections ◽  
Magnetic Recording ◽  
Recording Media ◽  
Magnetic Recording Media ◽  
Gamma Iron ◽  
Transmission Electron ◽  
Excellent Spatial Resolution ◽  
The Media ◽  
Memory Applications

Particulate magnetic recording media is widely used to store information in computer memory applications. The media consists of submicron-size gamma iron oxide and alumina particles held together by a binder resin onto a substrate (mylar for floppy disks and aluminum for rigid disks). The electrical properties of media depend on the physical characteristics (like size and shape), dispersion and orientation of iron oxide. Well- dispersed and optimum-sized alumina improvies wear resistance of the relatively soft media. Transmission electron microscopy (TEM), with its excellent spatial resolution, is found to be very useful in analyzing media. Ultramicrotomy can be conveniently used to prepare cross-sections of the media for TEM study The major advantage of ultramicrotomy is that it provides a large amount of uniformly thin area relatively quickly.

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