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Bandgar, Sneha S.,Yadav, Hemraj M.,Shirguppikar, Shailesh S.,Shinde, Mahesh A,Shejawal, Rajendra V.,Kolekar, Tanaji V.,Bamane, Sambhaji R. The Korean Ceramic Society 2017 한국세라믹학회지 Vol.54 No.2
For the better success of biomedical implant surgery, we used a modified solution combustion method to synthesize Hydroxyapatite (HA) and Chromium ($Cr^{3+}$) modified Cr-HA with different concentrations of 0.5, 1.0, 1.5, 2.0 and 2.5. The Cr-HA nanopowder was characterized by TGA, XRD, SEM-EDS and TEM. The HA and Cr-HA powders were subjected to in vitro biological studies to determine their biocompatibility and hemocompatibility. The cytotoxicity of HA and Cr-HA were evaluated on Hela (Cervical cancer) cells and L929 (mouse fibroblast) cells by using MTT assay. Hemocompatibility studies demonstrated a noticeable haemolytic ratio below 5%, which confirms that these materials are compatible in nature with human blood. The results of the present work confirm that the synthesised HA and Cr-HA are biocompatible and can be extensively used in the biomedical field to improve overall material biological properties.
Sandip Sabale,Arti Bandgar,Haiyan Wang,GURAV KISHOR VISHWANATH,김진혁,S. H. Pawar 대한금속·재료학회 2013 METALS AND MATERIALS International Vol.19 No.3
Phase pure anatase nanospherical TiO2 has been obtained by sol dissolution method using TiCl3 as a precursor. The effect of annealing temperature on the properties of TiO2 has been studied and discussed. The structural, morphological and optical properties of the synthesized powder were determined using XRD, SEM, AFM, TEM, UV-Visible and flourimetry. The anatase phase of synthesized TiO2 using this method has a higher thermal stability up to 800 °C after which it is transformed into rutile phase. The crystallite size increases with the annealing temperature. The shift in absorption towards the visible region is observed for the anatase phase. The material showed fluorescence properties emitting light of 410 nm. The study also evaluated the photodegradation of a congo red as model dye. The TiO2 powder has shown good catalytic properties due to its high surface area. The proposed method is simple, fast, and efficient and reproducible for the synthesis of homogeneous nanospheres of TiO2, which will be applicable in possible optoelectronic devices.
G.D. Khuspe,S.T. Navale,D.K. Bandgar,R.D. Sakhare,M.A. Chougule,V.B. Patil 대한금속·재료학회 2014 ELECTRONIC MATERIALS LETTERS Vol.10 No.1
Nanocomposites of polyaniline (PANi) and tin oxide (SnO2) were prepared by adding SnO2 nanoparticles (NPs) in different weight ratios (0% -50%) into the PANi matrix. X-ray diffraction (XRD), field emission scanning electron microscopy (FESEM) and transmission electron microscopy (TEM) were used to form the polyaniline-SnO2 nanocomposites (PANi-SnO2) - a polymer-composite. PANi films modified with SnO2NPs were prepared by the spin coating method. The gas sensing properties of PANi, SnO2 and PANi-SnO2 polymercomposite films were observed and it was found that: • The response of PANi film to 100 ppm NH3 at room temperature was 30% (stability 58%). • The response of SnO2 film to 100 ppm NO2 was 19% (stability 79%) at operating temperature 200°C, which is higher than the room temperature. However, SnO2 exhibited no response to NO2 and NH3 at room temperature. • The properties of the polymer-composite as a gas sensor were studied for various reducing (CH3OH, C2H5OH, NH3, H2S) as well as oxidising (NO2 and Cl2) gases. We demonstrated that the PANi-SnO2 (50%) polymer-composite film offers high stability and reproducibility and is a superior sensor to toxic gases operating at room temperature. (Results showed that they are highly selective to NH3 along with maximum response -72% to 100 ppm, fast-response time of 167 s and better stability - 86% at room temperature. The unique nanostructure of this polymer composite with its high surface area offers these advantages.
Chavan, Hemant V.,Babar, Santosh B.,Hoval, Rahul U.,Bandgar, Babasaheb P. Korean Chemical Society 2011 Bulletin of the Korean Chemical Society Vol.32 No.11
A series of pyranopyrazoles, was efficiently synthesized via one-pot, four component reaction of ethyl acetoacetate, hydrazine hydrate, aldehydes and malononitrile in the presence of catalytic amount silicotungstic acid under solvent free condition. NOE experiments confirmed that the product exist exclusively in the 2H form. The present protocol offers the advantages of clean reaction, short reaction time, high yield, easy purification and economic availability of the catalyst.
Hemant V. Chavan,Rahul U. Hoval,Santosh B. Babar,Babasaheb P. Bandgar 대한화학회 2011 Bulletin of the Korean Chemical Society Vol.32 No.11
A series of pyranopyrazoles, was efficiently synthesized via one-pot, four component reaction of ethyl acetoacetate, hydrazine hydrate, aldehydes and malononitrile in the presence of catalytic amount silicotungstic acid under solvent free condition. NOE experiments confirmed that the product exist exclusively in the 2H form. The present protocol offers the advantages of clean reaction, short reaction time, high yield, easy purification and economic availability of the catalyst.
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.