Vellore Institute of Technology (VIT) is a private university located in&nbsp;Tamil Nadu, India. Founded in 1984, as Vellore Engineering College, the institution offers 20 undergraduate, 34 postgraduate, four integrated and four research programs. It has campuses in Vellore, Amravati, Bhopal and Chennai.

VIT is one of the top ranked private universities in India according to NIRF, THE and QS Rankings.&nbsp;Govt. of India has recognized&nbsp;VIT, Vellore as an&nbsp;Institution of Eminence. This has allowed VIT to take independent quality initiatives and move up in world ranking.

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VIT University

Department of Sensor and Biomedical Technology

SU-8 negative resist and polydimethylsiloxane (PDMS) elastomer are widely used for the development of any polymer based flexible biosensors. Although SU8 based sensors are easier to realize through photolithography technique, PDMS is a better counterpart with enhanced sensitivity and biocompatibility for detecting various analytes and in the realization of implantable/semi-implantable flexible biosensors and energy harvesting devices. However, incompatibility of PDMS towards microdevice realization using photolithography process posses a great limitation. Present work explores 3D micropatterning of PDMS surface through customized wet etching technique using N-methyl-2-pyrrolidone (NMP) and tetra-n-butylammonium fluoride (TBAF) using Kapton tape as a novel hard mask. The process flow involves incorporation of novel sacrificial layers of positive photoresist to realize free hanging 3D micro-structures of PDMS and PVA layer for spontaneous release of the polymeric microstructure after device realization. © 2019 IEEE.

VIT Unitversity

School of Electronics Engineering

Vellore Campus

TENCON 2019 - 2019 IEEE Region 10 Conference (TENCON)

PDMS micromachining for flexible 3D microdevice realization using Kapton Tape as hard mask

Synthetic heart valves restore the functioning of a diseased valve better than mechanical and biological valves. Its biocompatibility and superior flexibility ispreferred for the replacement of diseased mitral valve. Considering the anatomical and hemodynamic limitations of the mitral valve, synthetic valves will be able to perform better than mechanical or biological valves. In this computational study, models of segmented polyurethane valves with varying leaflet configuration were designed.The bileaflet, trileaflet and quadrileaflet modelswere subjected to linear structural analysis to determine its durability and flexibility. The leaflet models were simulated to operate against atransvavular pressure gradient of 30mmHg (systolic pressure) and 120mmHg (diastolic pressure). The output in the form of von Misesstress distribution pattern for each of the leaflet model was obtained. The trileaflet and quadrileaflet configurationshowed better functionality in comparison to bileaflet valve. The outcome of this study is the basis for the development of a low profiled, transcatheter mitral valve replacement device, with superior durability and flexibility. © 2019 Association for Computing Machinery.

Proceedings of the 2019 2nd International Conference on Electronics and Electrical Engineering Technology

Structural Analysis to Evaluate the Design of a Synthetic Mitral Valve Prosthesis

A flexible composite film based piezoelectric nanogenerator has been explored using lead-free (1−x) KNaNbO3-x BaTiO3 NPs (x = 0.02, 0.04, 0.06 and 0.08) (used as KNN-x BTO) nanoparticles (NPs). The composite films were made of KNN-x BTO NPs impregnated into a Polydimethylsiloxane (PDMS) matrix. BTO was doped into the KNN lattice without affecting the orthorhombic phase of KNN. Structural analysis such as XRD and Raman spectroscopy were used to confirm the phase formation and atomic vibrations of the piezoelectric materials. Further the electrical analysis of the piezoelectric composite nanogenerator (PCNG) has been performed and the device generates a maximum electrical output of 58 V, 450 nA. Then the PCNG was used as an active sensor for sleep monitoring system by placing the PCNG in the hands and legs of human body and monitor the body movements. This type of system helps to diagnose the sleeping disorder in humans and to be a future advancement in mobile health care monitoring. © 2019 Elsevier B.V.

World University root node

Materials Letters

A flexible piezoelectric composite nanogenerator based on doping enhanced lead-free nanoparticles

Department of Integrative Biology

School of Bio Sciences and Technology

Fulltext

Bangladesh Journal of Pharmacology

Brine shrimp cytotoxicity potential of alpha-mangostin and dulxanthone D from Garcinia mangostana

Speckle noise is a granular disturbance, which is an inherent property in echocardiographic images. One of the most powerful and efficient tools for despeckling of images is wavelet transform. A literature survey conducted reveals many wavelet-based thresholding techniques are developed based on universal or level adaptive methods. To find the optimum threshold is a key point in speckle reduction. This paper shows the comparison of different thresholding techniques with proposed adaptive thresholding technique in terms of peak signal to noise ratio (PSNR), structural similarity measure index (SSIM), image quality index (IQI) and edge preservation index (EPI). The qualitative evaluation is done by using residuals. The processing time is also measured for different algorithms. The obtained results indicate that the proposed thresholding technique gives better performance in most of performance measurement parameters. © 2019, © 2019 IETE.

IETE Journal of Research

Adaptive Thresholding Method for Speckle Reduction of Echocardiographic Images

2019 IEEE Bombay Section Signature Conference (IBSSC)

IoT and Machine Learning based approach for Fully Automated Greenhouse

Composites Part B: Engineering

Classification of damages in composite images using Zernike moments and support vector machines

Purpose: This paper aims to focus on research work related to metamaterial-based sensors for material characterization that have been developed for past ten years. A decade of research on metamaterial for sensing application has led to the advancement of compact and improved sensors. Design/methodology/approach: In this study, relevant research papers on metamaterial sensors for material characterization published in reputed journals during the period 2007-2018 were reviewed, particularly focusing on shape, size and nature of materials characterized. Each sensor with its design and performance parameters have been summarized and discussed here. Findings: As metamaterial structures are excited by electromagnetic wave interaction, sensing application throughout electromagnetic spectrum is possible. Recent advancement in fabrication techniques and improvement in metamaterial structures have led to the development of compact, label free and reversible sensors with high sensitivity. Originality/value: The paper provides useful information on the development of metamaterial sensors for material characterization. © 2018, Emerald Publishing Limited.

Department of Multimedia

School of Design

Department of Communication Engineering

Sensor Review

A review: metamaterial sensors for material characterization

INNOVATIVE TEACHING PRACTICES FOR 4G STUDENTS

To improve teaching -learning process

The triboelectric nanogenerator (TENG) offers a simple and cost-effective method to harness waste energy and works on the principle of contact electrification and electrostatic induction. The performance and application of TENG depend to a great extent on the material used for fabrication. The most widely used materials include polymers and a few metals, well-arranged in the triboelectric series so as to promote electrification upon contact. New triboelectric materials are important for extending the applications and specificity of the TENG. A TENG based on a metal–organic framework (MOF) of the zeolitic imidazole family is reported here. The zeolitic imidazole framework-8 (ZIF-8) and Kapton are used as the active materials for MOF–TENG fabrication. Surface potential, structural, morphological and electrical measurements reveals detailed characteristics of ZIF-8, confirming the MOF as a potential candidate for TENG applications. The MOF–TENG generates a sustainable output of 164 V and 7 µA in vertical contact–separation mode. Finally, a self-powered UV counterfeit system and a tetracycline sensor are successfully developed and demonstrated with the MOF–TENG. The sensor is highly selective and reusable simply by washing. © 2019 WILEY-VCH Verlag GmbH &amp; Co. KGaA, Weinheim

Advanced Energy Materials

Metal–Organic Framework: A Novel Material for Triboelectric Nanogenerator–Based Self‐Powered Sensors and Systems