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Bhubaneshwar, India

Majumder S.,Institute of Physics, Bhubaneswar | Mishra I.,Institute of Physics, Bhubaneswar | Subudhi U.,IMMT | Varma S.,Institute of Physics, Bhubaneswar
Applied Physics Letters | Year: 2013

An enhanced biocompatibility from nanodot patterned TiO2 surfaces, fabricated by ion beam sputtering, has been observed here through its interaction with plasmid DNA. Investigations of the persistence length and the areal conformation of DNA show that the biocompatibility increases with ion fluence. Presence of nanostructures and increased surface roughness, in conjugation with higher oxygen vacancy sites that promote charge transfer from DNA moiety, are responsible for the increased hydrophilicity and biocompatibility of the patterned surfaces. © 2013 AIP Publishing LLC.

Dash R.R.,G. I. E. T. | Chakrabarti A.K.,National Institute of Technology Durgapur | Mukherjee P.S.,IMMT
Metallurgical and Materials Transactions B: Process Metallurgy and Materials Processing Science | Year: 2012

TiC/SiC reinforced cast ferrous composites have been prepared by smelting red mud - 30 pct charcoal briquettes in a 20-kg basic lined, single-phase direct arc furnace. Elements like silicon, aluminum, zirconium, and so on are also reduced from their respective oxides in the red mud and dissolved in the ferrous matrix. TiC/SiC particulates in the composite grow in a typical spiraling fashion. © The Minerals, Metals & Materials Society and ASM International 2011.

Chakraborty R.,University of Burdwan | Chatterjee S.,IMMT | Chattopadhyay P.,University of Burdwan
Journal of Radioanalytical and Nuclear Chemistry | Year: 2014

Nanocomposite titanium-phosphate (TiP) of different sizes was synthesized using Triton X-100 (polyethylene glycol-p-isooctylphenyl ether) surfactant. The materials were characterized by FTIR and powdered X-ray diffraction (XRD). The structural and morphological details of the material were obtained by scanning electron microscopy (SEM) and transmission electron microscopy. The SEM study was followed by energy dispersive spectroscopic analysis for elemental analysis of the sample. The important peaks of the XRD spectra were analyzed to determine the probable composition of the material. The average size distribution of the particles was determined by dynamic light scattering method. Ion exchange capacity was measured for different metal ions with sizes of the TiP nanocomposite and size-dependent ion exchange property of the material was investigated thoroughly. The nanomaterial of the smallest size of around 43 nm was employed to separate carrier-free 137mBa from 137Cs in column chromatographic technique using 1.0 M HNO3 as eluting agent at pH 5. © 2013 Akadémiai Kiadó, Budapest, Hungary.

Majumder S.,Institute of Physics, Bhubaneswar | Paramanik D.,Japan National Institute of Materials Science | Solanki V.,Institute of Physics, Bhubaneswar | Bag B.P.,IMMT | Varma S.,Institute of Physics, Bhubaneswar
Applied Physics Letters | Year: 2011

Crystalline TiO2 nanodots have been formed on single crystal rutile TiO2 (110) surfaces via ion beam sputtering method by utilizing Ar ion beams from electron cyclotron resonance source. Nearly five times enhancement in absorbance of visible light, ∼5 times increase in luminescence, and ∼0.1 eV narrowing of bandgap are observed for nanodot-patterned surfaces, in the absence of any dopant material. Formation of crystalline rutile TiO2 nanodots and development of Ti interstitials on the TiO2 (110) surface, after ion beam sputtering, are responsible for these observations. Results suggest that these nanodot-patterned rutile TiO2 surfaces can become effective photocatalysts. © 2011 American Institute of Physics.

News Article | March 3, 2016
Site: www.techtimes.com

Scientists at the Institute of Minerals and Materials Technology (IMMT) found a new way to improve color, clarity and luster of red ruby — microwaves. Rubies are one of the world's most popular gemstones and this study could provide many owners a means to improve the look of their beloved stones. Published in Spinger's journal Applied Physics A, the study has shown that even if heat treatments were used in the past, this is the first time that scientists used microwave heating as a method to improve ruby's color. "Microwave heating, an unconventional method of fast thermal excitation, produces new results in gemstone like ruby," said Shubhashree Swain, author of the study. "The study provides a new vista for future workers in the area," he added. Usually, scientists use heat treatments to improve the color saturation, trading value and clarity of gemstones. As the technology improved, they applied chemicals or surface coatings, used beam irradiation and other sophisticated methods. This study proposes a new and cheaper means to improve the overall look of red ruby through the use of microwaves. This method has been proven useful in other materials as well; like metals, composites and ceramics. To test the new method, they collected rubies from Sinapali, Odisha in India and treated them in a microwave for a few minutes at 1,500-degree Celsius. To compare treated rubies in the microwave with those which were not treated, they used different techniques including X-ray diffraction, fluorescence spectrophotometry, X-ray photoelectron spectroscopy, ultraviolet-visible spectroscopy and Raman spectroscopy. The researchers have found that the microwave method made improvements in the gemstone's color and structure. The reddish black color of the stone turned to light pink, which believed to be brought about by changes in the stone's chromium, titanium and iron elements. The microwave method has many benefits especially for the gemstone industry. It is an easier and less expensive way to treat gemstones than traditional heating. Aside from that, it provides uniform heating, it's an energy-saving method, and it's eco-friendly. "The overall results demonstrate for the first time the effect of fast heating like MW on the microstructural properties of the gemstone and various oxidation states of impurity elements in the natural ruby," the researchers concluded in the study.

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