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Kolhāpur, India

Mane D.R.,Belbhim College | Birajdar D.D.,Belbhim College | Patil S.,Belbhim College | Shirsath S.E.,Vivekanand College | Kadam R.H.,Materials Science Research Laboratory
Journal of Sol-Gel Science and Technology

Cu0.7- x Co x Zn0.3Fe2O 4 (0 ≤ x ≤ 0.5) nanoparticles are prepared by sol-gel auto combustion method, using copper nitrate, zinc nitrate, ferric nitrate, cobalt nitrate, and citric acid as the starting materials. The process takes only a few minutes to obtain as-received Co-substituted Cu-Zn ferrite powders. X-ray diffraction (XRD), vibrational sample magnetometer and thermo gravimetric analysis are utilized in order to study the effect of variation in the Co substitution and its impact on particle size, lattice constant, density, cation distribution and magnetic properties like magnetization, coercivity, remanent magnetization, ferritization temperature and associated water content. Lattice parameter found to increase with increasing Co content, whereas X-ray density, bulk density, particle size showed decreasing trend with the Co content. Cation distribution indicates that the Co and Cu ion show preference towards octahedral [B] site, Zn occupy tetrahedral (A) site whereas Fe occupy both tetrahedral (A) and octahedral [B] site. Redistribution of cations takes place for x > 0.3. Saturation magnetization (Ms) increases from 52.99 to 79.62 emu/g (x ≤ 0.3), for x > 0.3 Ms decreases with increase in Co content x. However, coercivity, magnetocrystalline anisotropy and remanent magnetization increases with the Co2+ substitution. © 2010 Springer Science+Business Media, LLC. Source

Patil D.S.,Shivaji University | Shaikh J.S.,Shivaji University | Dalavi D.S.,Shivaji University | Karanjkar M.M.,Vivekanand College | And 3 more authors.
Journal of the Electrochemical Society

Undoped and Mn doped Polyaniline (PANI) thin films were deposited on stainless steel substrates by sonochemical method. Films deposition was done using dip coating technique. To study the Mn doping effect on the specific capacitance of PANI, concentration of Mn was varied from 0.4 to 1.6 wt %. The Fourier Transform-IR (FT-IR) and Raman spectroscopy techniques have been used for the phase identification and determination of the Mn in the PANI films. Surface morphology was examined by using Field Emission Scanning Electron Microscopy (FESEM) which showed nanofiber aggregate structure of undoped PANI and porous and well distributed nanofibers for the doped PANI. The supercapacitive behavior of the electrodes was tested in three electrode system with 1.0 M H2SO4 electrolyte by using cyclic voltammetry. The specific capacitance value increases from 285 to 474 F g-1 as the Mn concentration was increased. This work demonstrates a simple strategy of improving specific capacitance of the polymer and hence may be adopted easily for other dopants also. Thus the work will open a new avenue for designing low cost high performance devices for better supercapcitors. © 2011 The Electrochemical Society. Source

Adhyapak M.S.,Vivekanand College | Kachole M.S.,Dr. Babasaheb Ambedkar Marathwada University
Journal of Thrombosis and Thrombolysis

Throughout the world, herbal medicines are consumed by most of the patients without considering their adverse effects. Many herbal medicines/plant extracts have been reported to interact with the natural blood clotting system. In continuation to this effort, thirty medicinal plant extracts were allowed to interact with citrated human blood and the clotting time was measured after re-calcification in vitro using Lee and White method. The aq. leaf ext. of Syzygium cumini and Camellia sinensis significantly prolonged the clotting time. In response to the prothrombin time and activated partial thromboplastin time tests, the ext. of C. sinensis showed normal APTT and marginally prolonged the PT to 16.7 s (control—15.2 s) while S. cumini showed normal PT but significantly prolonged the APTT to 66.9 s (control—20.7 s). This suggests that, C. sinensis acts on the extrinsic pathway while S. cumini on the intrinsic pathway. There are some common herbal formulations that are frequently used by the patients which contain above plant materials, like, Syzygium cumin in anti-diabetic formulations, while the ext. of C. sinensis is consumed frequently as beverage in many part of the world. Hence, patients having known bleeding tendency or haemophilia disease should take into account the interaction potential of these plants with the natural blood clotting system while taking herbal formulations containing above plants; specially, the patients suffering from intrinsic pathway factor deficiency should keep a limit on the consumption of S. cumini while extrinsic pathway factor deficiency patients should limit C. sinensis. Also, the medical practitioners should consider the patient’s food consumption history before doing any major surgical procedures. © 2015 Springer Science+Business Media New York Source

Shirsath S.E.,Vivekanand College | Kadam R.H.,Materials Science Research Laboratory | Patange S.M.,Materials Science Research Laboratory | Mane M.L.,S.G.R.G. Shinde Mahavidyalaya | And 2 more authors.
Applied Physics Letters

Dy 3+ substituted Ni-Cu-Zn (Ni 0.4Cu 0.4Zn 0.2Dy xFe 2-xO 4) ferrite nanoparticles were obtained at 600 °C by synthesizing sol-gel auto-combustion method, and they exhibit a particle size of 12-21 nm. X-ray diffraction patterns confirm the presence of secondary phase of DyFeO 3+ and Fe 2O 3 for the Dy 3 substituted samples. Ni-Cu-Zn ferries doped with Dy 3 possess better grain structure and growth than that of pure Ni-Cu-Zn ferrite. The saturation magnetization increases remarkably up to 81 emu/g with increasing the Dy 3+ ions. The increased saturation magnetization related to increased exchange interactions between Fe-Fe ions and also with increased particle size. Blocking temperature was found to decrease with increasing Dy 3+ substitution. An enhancement in initial permeability and Curie temperature was observed with Dy 3+ substitution. © 2012 American Institute of Physics. Source

Raghavender A.T.,Seoul National University | Shirsath S.E.,Vivekanand College | Vijaya Kumar K.,Jawaharlal Nehru Technological University
Journal of Alloys and Compounds

Nanocrystalline ferrites of compositions Ni0.5+1.5xCu 0.3Zn0.2Fe2-xO4 (0 ≤ x ≤ 0.5) have been synthesized by using oxalate based precursor method at very low temperature. The Ni-Cu-Zn ferrite powder particles were obtained at 450 °C and they exhibit a crystallite size of 16-24 nm. The lattice constants were found nearly equal in all these samples due to minute difference in the ionic radius between Ni2+ and Fe3+ ions. The thermal analysis has showed the ferrite phase formation at very low temperature 377 °C. The two main spectroscopic bands corresponding to lattice vibrations were observed in the wavelength range from 300 to 1000 cm-1. The IR bands at 570 cm-1 (v1) and 390 cm-1 (v2) were assigned to tetrahedral (A) and octahedral [B] groups. The spectroscopic bands shift with the increase of doping concentration. The magnetization was found to decrease with increasing doping concentration. The dielectric constant (ε′) and dielectric loss tangent (tan δ) decreased with increase of frequency. The dielectric constant and dielectric loss obtained for the nanocrystalline ferrite samples appeared to be lower than that of the ferrites prepared by other synthesis techniques. © 2011 Elsevier B.V. Source

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