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Material Science Research India

Volume 14 Number 2

December 2017

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Publication date (Print Edition): 31 December, 2017

Publication date (Online): Published ahead of Print issue

Synthesis, Structural Characterization and Study of Biological Activity of Hydrazine  Derivatives

Poonam Goklani* and Anil Gupta

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Hydrazide-hydrazone   derivatives   play  vital  role  in  development  of  various pharmacological activities such as anti-tubercular, antiproliferative  and antitumor activities. Some novel biologically active   Hydrazide   derivatives substituted   with  heterocyclic   moiety have  been synthesized.  All the synthesized  compounds  structures   were   confirmed  by   IR,  NMR  and  Mass  spectra. Synthesized  compounds  were  subjected  to  antibacterial  screening in  vitro  and  biological  activity in vivo.

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Machinability and Wear of Aluminium Based Metal Matrix Composites by MQL - A Review

Ankush Kohli*1 , H. S. Bains2, Sumit Jain3 and D. Priyadarshi1

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Metal matrix composites have exhibited better mechanical properties in comparison withconventional metals over an extensive range of working conditions. This makes them an appealing alternative in substituting metals for different applications. This paper gives a survey report, on machining of Aluminium metal Matrix composites (AMMC), particularly the molecule strengthened Aluminium metal matrix composites. It is an endeavour to give brief record of latest work to anticipate cutting parameters and surface structures in AMMC. The machinability can be enhanced by the utilization of Minimum Quantity Lubrication (MQL) during the machining of AMMC.

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Upconversion and Spectroscopic Properties of Rare Earth Codoped Lead Borate Glass Matrix

K. Krishna Murthy Goud 1* , CH. Ramesh2 and B. Appa Rao

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To develop efficient upconversion laser materials in the visible region an active lead borate glasses doped with Er3+/Yb3+  rare earth ions (GEY) has been studied extensively. In this investigation characterization techniques like Optical absorption, FTIR and photoluminescence were recorded and the data was analyzed. To evaluate the values of Ω2, Ω4 and Ω6 Judd-Ofelt theory has been applied to the f ↔ f transitions. Based on Judd–Ofelt theory branching ratio (βr) oscillator strength and the radiative life time (τR) values were determined. The upconversion spectra exhibited three emission bands at around 525 nm (2H11/2 ® 4I15/2), 545 nm (4S3/2 ® 4I15/2) and 660 nm (4F9/2 ® 4I15/2). The energy transfer mechanism between Yb3+ and Er3+ was discussed very clearly. Comparing the data obtained in other Er3+/Yb3+ doped materials, the lead bismuth gallium borate glasses doped with 0.6 mol% of Er2O/0.2 mol% of Yb2O3 ions are suitable materials for developing red upconversion lasers in the visible region.

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Effect of Nb Doping on Morphology, Optical and Magnetic Behaviors of Ultrasonically Grown Zno Nanostructures

U. Pal,1* N. Morales-Flores,2 and E. Rubio-Rosas3

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ZnO nanostructures containing doped with different atom % of Nb are fabricated through ultrasound assisted hydrolysis in water. Effects of Nd incorporation on the structure, morphology, defect structure, optical, and magnetic behaviors of the nanostructures have been studied utilizing X-ray diffraction, scanning electron microscopy, photoluminescence spectroscopy and magnetometry. We demonstrate that while Nb incorporation in ZnO nanostructures drastically modify their morphology and crystallinity, it does not affect the band gap energy of of ZnO significantly. While Nb incorporation in small concentration creates higher oxygen vacancy related defects in ZnO nanostructures, which are responsible for their visible emissions, incorporation of Nb in higher concentration reduces those defect structures from the band gap of the nanostructures. While oxygen vacancies have been frequently associated to the ferromagnetic behavior of ZnO nanostructures, our results indicate that a mere presence of oxygen vacancy in Nb-doped ZnO nanostructure does not guaranty their ferromagnetic behavior.

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Determination of Young’s Modulus of Aluminium, Copper, Iron, Brass and Steel Alloys by Using Double Exposure Holographic Interferometry (DEHI) Technique

H. R. Kulkarni1 , S. N. Shukla2 and M. B. Dongare3

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Double Exposure Holographic Interferometry (DEHI) technique has wide applications in the field of science and engineering. DEHI can be used to determine very small surface changes in an object at very small interval of time.

In present case, DEHI technique is used to record the hologram of the same object at different times subjected to different loads. This method has been advantageously used to determine Young’s Modulus (Y) of Aluminium, Copper, iron, brass and some steel alloys. It is found that the values of Y obtained by using DEHI technique are in close agreement with standard values of Y available for respective metals and their alloys. The method is also used to make standard relation between effect of carbon composition and Y of steel alloys.

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Green Synthesis of Zinc Oxide Nanoparticles, its Characterisation and Application

Tushar Shamba Anvekar,* Vrajeshwari Rajendra Chari and Hari Kadam

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Green synthesis of zinc oxide nanoparticles (ZnO) was carried out using the aqueous extract of Adulsa or Lemongrass leaves .The XRD pattern revealed well defined peaks appearing at 2  position corresponding to the hexagonal wutzite structure of ZnO nanoparticles. Synthesized ZnO catalyst was applied efficiently in Biginelli reaction.

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Effect of Ag Doping on Properties of Al –Doped Zno Nanoparticles VARIES AS Zn1-X-Yagxalyo

Neha Sharma* and Sanjay Kumar

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In present study, undoped ZnO, Zn0.8Ag0.2O, Zn0.8Al0.2O and Zn0.6Al0.2Ag0.2O samples are synthesized by simple solution method. X-ray diffraction (XRD), Scanning Electron Microscopy (SEM), Energy-Dispersive X-ray spectroscopy (EDX) and UV-visible (UV-Vis) spectroscopy are used to perform the characterization of undoped, doped and codoped samples. XRD analysis is exposed that hexagonal wurtzite crystalline structure obtained for undoped, doped and codoped samples without any extra representation of impurity phases. The crystalline size is when evaluated by using Scherrer, It has 44, 49, 41and 37nm for undoped ZnO, Zn0.8Ag0.2O, Zn0.8Al0.2O and Zn0.6Al0.2Ag0.2O samples. Similarly, the crystalline size and strain are also evaluated by Williamson hall (W-H) and size strain plot (SSP) for the undoped, doped and codoped nanoparticles. The evaluated crystalline size by SSP is three times greater than the result of the scherrer method. The SEM exposes that surface morphology of nanoparticle samples, in this case is the formation of large agglomeration in spherical shape with nanocrystallites of undoped and doped ZnO with apparent and definite boundaries. EDS points out the replacement of Al2+ and Ag+ with Zn2+ in ZnO matrix and consequences in the development of single-phase Zn1−xyAgxAlyO. The blueshift is shown in UV-Vis absorption spectra because the band gap value increases with the increase in doping, except Ag+ doped ZnO nanoparticles.

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An Optimized Platinum (Pt) Doped Tin-oxide(SnO2) Ink for Deposition of Gas Sensing Thick Film on LTCC Micro-hotplate

Kritika Bhattacharya1* ,Shruti Kapoor1 and Nikhil Suri2

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An optimized platinum (Pt) doped tin oxide (SnO2) ink was prepared by chemical route and was deposited on low temperature co-fired ceramics (LTCC) micro-hotplate by screen printing. An alkoxide ink was prepared by mixing tin(II) 2-ethylexanoate (17 wt%) with isopropanol (27 wt%) and SnO2 powder (55 wt%). Doping of the ink was done using Pt (1 wt%) which increased the resistance of SnO2 film at room temperature and also reduced the operating temperature. The temperature of ensor was obtained and stabilised using MOSFET based temperature stability circuit. Film characterization was performed using Atomic Force Microscopy (AFM), Scanning Electron Microscopy (SEM) and Energy Dispersive X-ray Spectroscopy (EDS) technique. Small grain size and high porosity is the requirement for good sensing. The grain size was found to be in the range of 150-180 nm and the film was sufficiently porous. Resistance change of the film was also investigated in the presence of carbon  monoxide (CO) to assure gas sensing.

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Electrochemical Corrosion Behavior, Microstructure and Soldering Properties of Tin Based Alloys

Abu Bakr El-Bediwi*, Reham Samir and Mustafa Kamal

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Microstructure, thermal behavior, wettability and electrochemical corrosion parameters of Sn82Bi15Zn3, Sn77Bi15Zn3Sb5, Sn79Bi15Zn3Ag3 and Sn79.3Bi15Zn3Cu0.7 alloys have been studied and analyzed.  Scanning electron microscope, x-ray analysis and differential scanning calomeitry graphs of these alloys show that, they contained different phases with formed solid solution.  A contact angle of used alloys varied from 21 to 37 which less than 90° which they are lower contact angle.  That is meant the wetting process of these alloys are very favorable and the fluid will spread over a large area of the surface.  Also melting temperature of these alloys are lower than based eutectic solder alloys by 11% to 22%.   Corrosion rate of Sn82Bi15Zn3 alloy deceased by adding Sb or Ag or Cu elements.  The Sn77Bi15Zn3Sb5 alloy has lowest corrosion rate value.

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Study of Structural Properties of Annealed CdO and ZnO thin films

Kishor Hurde1*  and A. B. Lad2

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The CdO and ZnO are n- type semiconductors are transparent conducting in nature, inexpensive, mechanically stable and highly resistance to oxidation. In the present work these films have been obtained from thermal annealing of chemically deposited CdS and ZnS thin films. The structural properties of chemically deposited CdS and ZnS thin films and thermally annealed CdO and ZnO thin films have been studied. From x-ray diffraction data it is observed that annealing of the thin films at a particular temperature enhance the structural properties.

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Structural, Thermal and Optical properties of PMMA, PEO and PMMA/PEO/LiClO4 Polymer Electrolyte Blends

M. Ravindar Reddy 1*, M. Jaipal Reddy 2 and A. R. Subrahmanyam1

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This paper is a report of a study conducted on Structural, thermal and optical Properties of pure PMMA, pure PEO and PMMA-PEO-LiClO4 polymer blend electrolyte thin films. These films were prepared using solution casting technique and characterized by X-ray Diffractometer (XRD), Scanning Electron Microscopy (SEM), Fourier Transform Infrared Spectroscopy (FTIR) and Differential Scanning Calorimetry (DSC). XRD analysis Observations confirmed that amorphous, crystalline and semi crystalline nature of pure PMMA, pure PEO and PMMA-PEO-LiClO4 polymer blend electrolyte thin films the SEM micrographs suggest that the surface morphology of pure PEO changes from smooth to rough when PMMA and LiClO4 added to PEO polymer, which shows the interaction/ interface between the two polymers and polymer blend electrolyte due to cross – linking. Glass transition (Tg) and melting temperatures (Tm) of pure PMMA, pure PEO and PMMA-PEO-LiClO4 polymer blend electrolyte thin films were confirmed by DSC analysis. FTIR spectra confirmed that complex formation and interaction among PMMA, PEO polymers and LiClO4 salt.

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