ORALS

SESSION: ManufacturingWedPM1-R3 Specific Applications to Bioengineering / Energy / Materials	Mamalis International Symposium on Advanced Manufacturing of Advanced Materials and Structures with Sustainable Industrial Applications
Wed Nov, 7 2018 / Room: Bossa (150/3rd)
Session Chairs: TBA Session Monitor: TBA

14:50: [ManufacturingWedPM107]
Nano Thermometry: Origin, Evolution, and Emergence
Pragati Kumar¹ ; Nupur Saxena¹ ; Tania Kalsi¹ ; ¹Central University of Jammu, Jammu, jammu, India;
Paper Id: 247 [Abstract]

The physical entity that has an effect on even the tiniest elements of daily life and is involved in a broad spectrum of human activities is temperature. Accurate and reliable measurement of temperature with high spatial resolution of many special inaccessible objects is a challenging task. The conventional methods of temperature measurements are not companionable with the current nano/bio technologies, as they demand precise thermometry down to the nanoscale regime. Optical temperature sensing using nanomaterials is a promising method to achieve it. This is the only thermometry that works in non-contact mode and has high resolution and sensitivity. A range of versatile materials have been utilized to fabricate luminescence-based optical thermometers to achieve high sensitivity and wide working range. This review article focuses on the gradual advances in luminescence-based optical temperature sensors and highlights the wide range of materials used to fabricate them. The article covers the importance of temperature sensors and their applications, followed by the overview of various types of thermometry and their mode of operations with detailed description of optical thermometry, particularly luminescence based sensors. Later section deals with different detection modes for the analysis of the luminescent sensors. The subsequent section will discuss a number of materials and their structures used for fabrication of luminescence based temperature sensor; viz. (a) Metal Organic Frameworks, (b) Quantum Dots (QDs), (c) Rare Earth Doped Phosphors and (d) Nanocomposites. In all, the article compares different thermometers in the basis of mechanism, constituting materials, and their performance parameters. Among all the device parameters, sensitivity and temperature range are the most concerned issues. To the best of our knowledge, highly luminescent rare earth doped phosphors¹ could achieve the maximum sensitivity as 7% K^-1 and a temperature range of 20-500K. However, our group has reported a relative sensitivity of 8.4 K^-1 and the widest temperature range of 20-560K using CdS:SiO₂ nanocomposite². Further improvement in these parameters by doping of Ag in CdS:SiO₂ nanocomposite system will be discussed in this article. The review features a comprehensive summary on challenges and new direction in designing luminescence based temperature sensor.

References:
[1] S. Huang, X. Wei, Y. Chen and M. Yin, J. Lumin., 2014, 152, 148.
[2] N. Saxena, P. Kumar, and V. Gupta, RSC Advances, 2015, 5, 73545.

SESSION: CompositeTuePM1-R8	6th Intl. Symp. on Composite, Ceramic and Nano Materials Processing, Characterization and Applications
Tue Nov, 6 2018 / Room: Grego (50/3rd)
Session Chairs: Emrah Ozensoy; Pragati Kumar; Session Monitor: TBA

14:25: [CompositeTuePM106]
Nanotwinning in Materials: A Worthy Defect for Superior Properties
Pragati Kumar¹ ; Prateek Uttam¹ ; Nupur Saxena¹ ; ¹Central University of Jammu, Jammu, jammu, India;
Paper Id: 242 [Abstract]

This article reviews current primary analysis on twin boundaries defect at nano-regime. We emphasis essentially on studies that intent to understand, through modelling, experiments, or both, the origin and effects of twinning at elementary level. We foresee that, by imparting an extensive viewpoint on the happening progress in twinning, this analysis will pitch in the juncture for designing or tracing new metallic and semiconductor materials with modified alter properties like thermoelectric¹, mechanical², optical^3,4, ferroelectric and magnetic⁵ etc. Since it is nearly unworkable to slog with defect free or impurity free materials, it is vital to comprehend how defects and impurities modify the properties of the materials. To be specific, it is more necessary to differentiate between distinct types of impurities (defects) and decide if their existence is favourable or not, so that we can use it as per our requirement and can be used in different application by enhancing various properties of the material. We have analysed these issues and provided an updated overview of the current characterization tools able to identify and detect defects in different forms of materials, and also made an overview on the possible applications

References:
[1] G. Li, S.I. Morozov, Q. Zhang, Q.An, P. Zhai, and G.J. Synder, Physical Review Letter 119 (2017) 215503.
[2] I.A. Ovidako and A.G Sheinerman, Rev.Adv.Mater.Sci.44(2016)1
[3] Y.Q. Wang, R. Smirani and G.G. Ross Nano Lett. 4, (2004) 2041.
[4] P. Kumar, N. Saxena, F. Singh and A. Agarwal, Physica B:Condensed Matter 407 (2012) 3347
[5] X. Li, C. Lu, J. Dai, S. Dong, Y. Chen, N. Hu, G. Wu, M. Liu, Z. Yan and J.M Liu, Scientific Reports 4 (2014) 7019