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22 results on '"Yadav, Premlata"'

5. Defect free monolayer and bilayer graphene exfoliated by solvent with low dielectric constant.

Author

Vedanki, Dohare, Chandrabhan, KumarSrivastava, Pawan, Yadav, Premlata, Ghosh, Subhasis, Sharma, Veerendra K., Prajapat, C. L., and Yusuf, S. M.

Subjects
GRAPHENE, PERMITTIVITY, PROPYLENE carbonate, TRANSMISSION electron microscopes, MONOMOLECULAR films, SCANNING electron microscopes, SUPRAMOLECULAR chemistry
Abstract

Defect free mono- and bilayer graphene sheets have been synthesised in low dielectric (k∼5.4) organic solvent i.e. chlorobenzene by liquid phase exfoliation (LPE). Solution containing graphene flakes was transferred on solid substrate and subsequently, dried up to make mono- and bilayer graphene. Characterizations of as synthesized graphene flakes have been carried out by transmission electron microscope, scanning electron microscope and Raman spectroscopy. Graphene exfoliated in chlorobenzene(g-chlorobenzene) does not show D band in Raman spectra, however, a prominent D band is observed for graphene exfoliated in propylene carbonate (g-PC) which has much higher dielectric constant (k∼64). Because of low dielectric constant, chlorobenzene molecules don't interact with graphene while, Propylene Carbonate molecules makea supramolecular bond with graphene due to its (PC) high dielectric constant. This molecular interaction, which has been corroborated by first principle density function calculation, is the origin of Raman D band for g-PC. The distances between solvent molecules and graphene surface are found to be ∼4.34 A° and ∼3.32 A° for g-chlorobenzene and g-PC, respectively by density function theory. [ABSTRACT FROM AUTHOR]

Published
2020
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21. Structural and Magnetic Properties of Mg substituted Co Nanoferrites.

Author

Sharma, Jyoti, Sharma, Neha, Yadav, Premlata, Parashar, Jyoti, Jadoun, Priya, Saxena, V. K., Bhatnagar, D., and Sharma, K. B.

Subjects
MAGNESIUM compounds, MAGNETIC properties of metals, SUBSTITUTION reactions, COBALT compounds, X-ray diffraction, CRYSTAL structure, TRANSMISSION electron microscopy
Abstract

The structural and magnetic properties of magnesium substituted cobalt nano ferrites CoxMg1-xFe2O4 (x= 0.2, 0.4 and 1.0) have been investigated. The structural characterization has been done by X-ray diffraction (XRD) technique and transmission electron microscopy (TEM). The magnetic studies indicate that the samples show ferromagnetic behaviour at room temperature as well as at low temperature. The magnetization decreases with Mg content in both the cases due to the less magnetic nature of Mg ions than that of the Co ions. [ABSTRACT FROM AUTHOR]

Published
2016
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22. OPTIMIZATION TECHNIQUES OF MULTI-HOPPING AND PROBABILISTIC APPROACH FOR HIERARCHICAL CLUSTERED WSN OBTAINED BY GENETIC ALGORITHM APPROACH.

Author

UPADHYAYA, SHUCHITA and YADAV, PREMLATA

Subjects
*MATHEMATICAL optimization, *GENETIC algorithms, *ENERGY consumption, *WIRELESS sensor networks, *PROBABILITY theory, *HIERARCHICAL clustering (Cluster analysis)
Abstract

In Wireless Sensor Networks (WSNs), recharging node batteries may be inconvenient or impossible. The clustering phenomenon in WSN plays an important role in organization of the network and thereby affects network performance. Genetic algorithm approach over WSN is a new hierarchical clustering technique to create energy efficient clusters for routing in WSN. We further optimize this intelligent clustering approach by using multi-hop technique over the network structure obtained by GA approach and probabilistic approach at local level for maintenance of hierarchical clustered network for further longevity of network structure. The proposed solution helps in reducing the energy consumption and thereby extends the lifetime of network. [ABSTRACT FROM AUTHOR]

Published
2013

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