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Nanocrystalline hydroxyapatite doped with aluminium: A potential carrier for biomedical applications
Kolekar, T.V.,Thorat, N.D.,Yadav, H.M.,Magalad, V.T.,Shinde, M.A.,Bandgar, S.S.,Kim, J.H.,Agawane, G.L. Ceramurgica ; Elsevier Science Ltd 2016 CERAMICS INTERNATIONAL Vol.42 No.4
Biocompatible materials based on hydroxyapatite are potentially attractive for a wide range of medical applications. The effect of aluminium substitution on the biocompatibility of hydroxyapatite (HA) under the physiochemical conditions has been investigated. Various samples of aluminium doped hydroxyapatite (Al-HA) with different concentration (0, 0.5, 1.0, 1.5, 2.0, 2.5mol%) were successfully synthesised by solution combustion method and characterized by X-ray Diffraction (XRD), Transmission Electron Microscopy (TEM), and Scanning Electron Microscopy (SEM), and thermal analysis technique. XRD and TEM results reveal uniform and crystalline nature of Al-HA nanoparticles. The biocompatibility of the Al-HA nanoparticles was studied using L929 cell lines by MTT assays up to 24h. These Al-HA nanoparticles are biocompatible on cell lines L929 and do not have toxic effects for further possible in vivo applications. The results of these studies confirmed the biocompatibility of Al-HA and demonstrated the suitability for biomedical applications. The present work reveals the importance of structural, morphological, biocompatible properties of Al-HA nanoparticles and predicts the suitability for biomedical applications.
Sadhu Kolekar,Shashikant P. Patole,Ji‑Beom Yoo,Chandrakant V. Dharmadhikari 대한금속·재료학회 2018 ELECTRONIC MATERIALS LETTERS Vol.14 No.2
Field emission from nanostructured films is known to be dominated by only small number of localized spots which varieswith the voltage, electric field and heat treatment. It is important to develop processing methods which will produce stableand uniform emitting sites. In this paper we report a novel approach which involves analysis of Proximity Field EmissionMicroscopic (PFEM) images using Scanning Probe Image Processing technique. Vertically aligned carbon nanotube emittershave been deposited on tungsten foil by water assisted chemical vapor deposition. Prior to the field electron emission studies,these films were characterized by scanning electron microscopy, transmission electron microscopy, and Atomic ForceMicroscopy (AFM). AFM images of the samples show bristle like structure, the size of bristle varying from 80 to 300 nm. The topography images were found to exhibit strong correlation with current images. Current–Voltage (I–V) measurementsboth from Scanning Tunneling Microscopy and Conducting-AFM mode suggest that electron transport mechanism in imagingvertically grown CNTs is ballistic rather than usual tunneling or field emission with a junction resistance of ~10 kΩ. It wasfound that I–V curves for field emission mode in PFEM geometry vary initially with number of I–V cycles until reproducibleI–V curves are obtained. Even for reasonably stable I–V behavior the number of spots was found to increase with the voltageleading to a modified Fowler–Nordheim (F–N) behavior. A plot of ln(I/V3) versus 1/V was found to be linear. Currentversus time data exhibit large fluctuation with the power spectral density obeying 1/f2 law. It is suggested that an analogueof F–N equation of the form ln(I/Vα) versus 1/V may be used for the analysis of field emission data, where α may depend onnanostructure configuration and can be determined from the dependence of emitting spots on the voltage.
디지털 트윈을 사용하는 폐암환자 생존분석을 위한 웹 기반 마이크로 서비스 프레임워크
콜레카르시바니산제이 ( Shivani Sanjay Kolekar ),염성웅 ( Sungwoong Yeom ),최철웅 ( Chulwoong Choi ),김경백 ( Kyungbaek Kim ) 한국정보처리학회 2021 한국정보처리학회 학술대회논문집 Vol.28 No.2
One of the most promising technologies that is raised from the fourth industrial revolution is Digital Twin (DT). A DT captures attributes and behaviors of the entity suitable for communication, storage, interpretation or processing within certain context. A digital twin based on microservice framework architecture is proposed in this paper which identifies elements required for the complete orchestration of microservice based Survival Analysis of Lung Cancer Patients. Integration of microservices and Digital Twin Technology is studied.
Patil, Sandip K.,Patil, Suryakant A.,Vadiyar, Madagonda M.,Awale, Deepak V.,Sartape, Ashish S.,Walekar, Laxman S.,Kolekar, Govind B.,Ghorpade, Uma V.,Kim, Jin H.,Kolekar, Sanjay S. Elsevier 2017 Journal of molecular liquids Vol.244 No.-
<P>We are exploring a geminal dicationic ionic liquid (DCIL), 1,1'-(propane-1,3-diyl)bis(4-aminopyridin-1-ium) dihydroxide, [C-3(Amp)(2)][OH](2) as a fluorescent probe for detection of dihydroxybenzenes viz. hydroquinone (HQ) and catechol (CC). Simple and sensitive spectrofluorometric method is described which accomplished with efficient quenching of fluorescence of aqueous DCIL by dihydroxybenzenes. The sensor offers good linear detection range of 1-400 mu M and 1-1000 mu M with detection limits of 0.31 mu M and 0.40 mu M for HQ and CC, respectively. Under alkaline conditions HQ/CC oxidizes to corresponding benzoquinones which interact with DCIL and consequently quenching of fluorescence is occurred. This essential alkaline condition is in situ provided by purposefully tuned DCIL to having basic nature. The plausible quenching mechanism that involves photo-induced charge transfer pathway is evidently discussed. The proposed method is competent over a broad detection range. Selectivity of method is demonstrated by scrutinizing intervention of various interfering species. Recoveries from water sample analysis emphasize the possible use of DCIL probe in the detection of HQ and CC from water sources. The proposed method certainly confers a new approach in sensing techniques for dihydroxybenzenes. (C) 2017 Published by Elsevier B.V.</P>
Magnetodielectric Properties of La0.67Sr0.33MnO3 and Ba0.7Sr0.3TiO3 Thin Film Heterostructures
Arjun Tarale,Y.D. Kolekar,V.L. Mathe,S.B. Kulkarni,V.R. Reddy,Pradeep Joshi 대한금속·재료학회 2012 ELECTRONIC MATERIALS LETTERS Vol.8 No.4
The paper discuses synthesis and magnetodielectric properties of La0.67Sr0.33MnO3 (LSMO), Ba0.7Sr0.3TiO3 (BST),and BST/LSMO thin film heterostructures. The XRD spectra are determined for confirmation of the crystal structure of LSMO, BST and formation of a pure bi-phase composite. The paper presents variation of Cp and tanδ as a function of frequency between 100 Hz to 1 MHz and applied magnetic field up to 0.6 T. The observed variation of Cp, tanδ, magnetocapacitance and impedance spectra are analyzed in terms of a possible equivalent circuit model. The present analysis shows that the method of impedance spectra could be used to separate out the possible contributions.
Yadav, H. M.,Kolekar, T. V.,Barge, A. S.,Thorat, N. D.,Delekar, S. D.,Kim, B. M.,Kim, B. J.,Kim, J. S. Chapman and Hall 2016 Journal of materials science Materials in electron Vol. No.
<P>The photocatalytic degradation of methylene blue (MB) has been investigated under visible light irradiation with an incandescent light bulb using chromium doped TiO2 nanoparticles. Cr-TiO2 photocatalysts were successfully synthesized by sol-gel method at room temperature and characterized by X-ray diffraction (XRD), UV-Vis diffuse reflectance spectroscopy (UV-Vis DRS), Raman spectroscopy, Transmission electron microscopy (TEM) and X-ray photoelectron spectroscopy. The band gap energy of the nanoparticles were estimated using UV-Vis DRS technique. With increasing Cr3+ cations content into TiO2 host lattice, the optical absorption band tuned in the visible region. XRD and TEM results reveal uniform and crystalline anatase TiO2 nanoparticles. The photodegradation of MB indicated that the photocatalytic activity of pure TiO2 nanoparticles increased with increasing Cr3+ cations concentration.</P>
Shailaja R. Patil,Umesh S. Mote,Shivajirao R. Patil,Govind B. Kolekar 대한화학회 2009 Bulletin of the Korean Chemical Society Vol.30 No.12
A simple, rapid, practical and sensitive spectofluorimetric method was developed for the determination of trace amount of heparin (Hep). Under the Optimum conditions, we studied the interaction between NFLX-Ce3+-Hep complex by using absorption and fluorescence spectra. It was observed that Hep remarkably enhance the fluorescence intensity of the NFLX-Ce3+ complex at λ = 356 nm in the buffer solution of pH = 7.60 and the enhancement effect is shown to relate with the concentration of Hep. The linear range and detection limit for the determination of Hep was obtained. By the Rosenthal graphic method, the association constant (K) and binding numbers (N) of Hep with probe were investigated. This method is relatively free of interference from coexisting substances and successfully applied for the determination of heparin in heparin sodium injection samples. A suitable mechanism of fluorescence enhancement between NFLX-Ce3+ and the NFLX-Ce3+-Hep systems were proposed and discussed.