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- 저자 : Anil K. Suresh (검색결과 3 건)
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Magnetic ground state of the multiferroic hexagonal LuFeO3
Suresh, Pittala,Vijaya Laxmi, K.,Bera, A. K.,Yusuf, S. M.,Chittari, Bheema Lingam,Jung, Jeil,Anil Kumar, P. S. American Physical Society 2018 Physical Review B Vol.97 No.18
<P>The structural, electric, and magnetic properties of bulk hexagonal LuFeO3 are investigated. Single phase hexagonal LuFeO3 has been successfully stabilized in the bulk form without any doping by sol-gel method. The hexagonal crystal structure with P6(3)cm space group has been confirmed by x-ray-diffraction, neutron-diffraction, and Raman spectroscopy study at room temperature. Neutron diffraction confirms the hexagonal phase of LuFeO3 persists down to 6 K. Further, the x-ray photoelectron spectroscopy established the 3+ oxidation state of Fe ions. The temperature-dependent magnetic dc susceptibility, specific heat, and neutron-diffraction studies confirm an antiferromagnetic ordering below the Neel temperature (T-N) similar to 130 K. Analysis of magnetic neutron-diffraction patterns reveals an in-plane (ab-plane) 120 degrees antiferromagnetic structure, characterized by a propagation vector k = (0 0 0) with an ordered moment of 2.84 mu(B)/Fe3+ at 6 K. The 120 degrees antifferomagnetic ordering is further confirmed by spin-orbit coupling density functional theory calculations. The on-site coulomb interaction (U) and Hund's parameter (J(H)) on Fe atoms reproduced the neutron-diffraction Gamma(1) spin pattern among the Fe atoms. P-E loop measurements at room temperature confirm an intrinsic ferroelectricity of the sample with remnant polarization P-r similar to 0.18 mu(C) cm(2). A clear anomaly in the dielectric data is observed at similar to T-N revealing the presence of magnetoelectric coupling. A change in the lattice constants at T-N has also been found, indicating the presence of a strong magnetoelastic coupling. Thus a coupling between lattice, electric, and magnetic degrees of freedom is established in bulk hexagonal LuFeO3.</P>
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Medium constituents mediated engineering for size and shape tuning of gold nanocrystallites
Anil K. Suresh,Veena Vijay,Bahrudeen S. Hameed,Sureshkumar Ramasamy,Natarajan Sakthivel 한국공업화학회 2017 Journal of Industrial and Engineering Chemistry Vol.51 No.-
The current investigation introduces the utilization of cell culture mediums as a novel source for the oneplotsynthesis as well as stabilization of metal nanoparticles. By varying the medium constituents wecould control the size and shape distributions of the gold nanoparticles. Nanospheres of diameter24 6 nm and 19 5 nm were produced using DMEM and M199 mediums respectively, nanoneedles of150 50 nm using RPMI medium and nanoflowers of 60 25 nm using IMDM medium, with an overallyield of 91 2%. A remarkable decrease in the reaction duration (<3 min) was noted, irrespective of thegrowth mediums used. Fourier transform infrared spectroscopy and zeta potential measurementsrevealed them to have a common protenacious encapping agent with different overall surface charges of23 3,211,24 2, and20 1 mV for Au@DMEM, Au@RPMI, Au@IMDM andAu@M199 respectively. X-ray diffraction confirmed the purity and crystallinity of the particles withBragg peaks at (111), (200), (220) and (311) for gold nanocrystals. This approach could lead to the creativeutilization of novel eco-friendly sources for the production and size/shape control of nanoparticles. Moreover, the adopted methodology is absolutely green, robust and facile, offering new insights forsustainable synthesis for various biomedical and engineering applications.
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Das, Biraj,Sharma, Mukesh,Deka, Biplab K.,Hazarika, Ankita,Park, Young-Bin,Hazarika, Anil,Bhargava, Suresh K.,Bania, Kusum K. Elsevier 2018 Journal of environmental chemical engineering Vol.6 No.2
<P><B>Abstract</B></P> <P>Ag/AgCl/V<SUB>2</SUB>O<SUB>5</SUB> nanocatalysts with one dimensional (1D) architecture was synthesized in carboxylic acid functionalized multi-walled carbon nanotubes for methylene blue dye degradation. The growth of uniformly distributed nanoparticles along the carbon-nanotubes was revealed from high resolution transmission electron microscopy and atomic force microscopy analyses. Raman spectroscopy and transmission electron microscopy analyses also confirmed for the creation of defects in the multi-walled carbon nanotube. The hybrid nanocomposite appeared as a suitable photocatalyst for degradation of methylene blue dye absorbing the light in the visible range of solar spectrum. The presence of interactions within the nanoparticles and with the nanotubes was believed to enhance the photo-oxidation process. The creation of defects in the carbon nanotube on modification with Ag/AgCl/V<SUB>2</SUB>O<SUB>5</SUB> improved the photocatalytic activity by enhancing the photoelectron transfer process. About ∼90% of the total organic carbon of the dye molecule was found to decompose into CO<SUB>2</SUB>, H<SUB>2</SUB>O and inorganic ions within 25 min under sunlight.</P> <P><B>Highlights</B></P> <P> <UL> <LI> Ag/AgCl/V<SUB>2</SUB>O<SUB>5</SUB> with 1D architecture is synthesized in Multiwalled Carbon Nanotube. </LI> <LI> Ag/AgCl/V<SUB>2</SUB>O<SUB>5</SUB>-MWCNT appeared as suitable photocatalyst absorbing visible light of solar spectrum. </LI> <LI> Creation of defects in MWCNT enhanced the photocatalytic ability of the nanomaterial. </LI> <LI> The hybrid nanocomposite decompose methylene blue dye with high efficiency within 25 min under sunlight. </LI> <LI> The photocatalyst was recyclable for three consecutive cycles. </LI> </UL> </P> <P><B>Graphical abstract</B></P> <P>[DISPLAY OMISSION]</P> <P>Complete mineralization of MB dye with Ag/AgCl/V<SUB>2</SUB>O<SUB>5</SUB>-MWCNT nanocomposite under sun light.</P>
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