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Material Science Research India

Volume 14 Number 2

December 2017

Pages: —

Full Text available in PDF and HTML formats

Publication date (Print Edition): 31 December, 2016

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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Frequency Upconversion in Er3+/Yb3+ Codoped Lead Bismuth Gallium Borate Glasses

K Krishna Murthy Goud1*, Ch Ramesh2 and B Appa Rao3

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Lead bismuth gallium borate (GEY) glasses codoped with Er3+/Yb3+ were prepared by melt quenching technique. The glasses were characterized by X-ray diffraction spectra. Optical absorption, FTIR and photoluminescence spectra of these glasses have been studied. The optical absorption spectra  exhibits a band at 980 nm due to transitions from the ground states 4I15/2 and 2F7/2 to excited states of Er3+ and Yb3+ respectively. The other absorption bands at 488nm, 521 nm, 545 nm, 652 nm, 798 nm and 1510 nm are attributed to transitions from the ground state 4I15/2 to excited state of Er3+. Judd-Ofelt theory has been applied to the f « f transitions for evaluating Ω2, Ω4 and Ω6 parameters. Radiative properties like branching ratio br and the radiative life time τR have been determined on the basis Judd–Ofelt theory. Upconversion emissions have been observed under 980nm laser excitation at room temperature. Green and red up-conversion emissions are centered at 525, 545 and 660 nm corresponding to 2H11/2 ®4I15/2, 4S3/2 ®4I15/2 and 4F9/2 ®4I15/2 transitions of Er3+ respectively. The results obtained are discussed quantitatively based on the energy transfer between Yb3+ and Er3+.

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