Journal of Nano Technology and Its Application in Engineering

Author: S. Sreeremya

Abstract: Nanoscience is the branch of science dealing with study of minute particles on an atomic or molecular scale, whose size is measured in nanometers which is one billionth of a meter (i.e., 10-9 m). Nanotechnology is a branch of engineering which uses particles on a nanoscale. In dermatology and cosmeceuticals, the use of nanotechnology has been aggrandizing since its inception. The possible applications of nanotechnology in this field of science are diverse. Some of the significant indications comprises sunscreens, moisturizers, anti-aging formulations, phototherapy, antisepsis, vaccines, skin cancers, hair and nail care, antimicrobials, skin fillers, corticosteroids, visualization of tumors and sentinel lymph nodes, etc

Author: Sankhadeep Ghosh

Abstract: The mechanical property of metal oxide reinforced epoxy based Polymer Matrix Composites (PMCs) is studies here. Epoxy composites filled with ZnO, ZrO2 and CeO2 in various content of 0-3 wt% were prepared using the casting technique. The entire test was done in room temperature and ASTM standard. Experimentally the synthesis has been carried out. All the materials have been under go some mechanical tests. Density, hardness, tensile, flexural, compression and impact strength of neat epoxy were found to increase with the metal oxide content up to certain wt%. It was observed that metal oxide is not beneficial in improving the impact strength of neat epoxy. This paper also highlights the possible reasons for variation in the mechanical properties of developed polymer composites.

Authors:  Ajoy Roy, S.S. Nath

Abstract: In view of intrinsic fundamental interests and manifold technological application potentials of nano materials, the present research paper was undertaken to address synthesis, characterisation and explore the possibility of generating second harmonic frequency by one of Gr II-VI binary compound SnO2 on being at nanoscale (quantum dot) and when the material is exposed to strong E. M. light comparable to Laser.

Authors:Kavita Deshmukh, Maithili Bhakare, Samyukta Shrivastav, Vaishnavi Naik, Swamini Chopra, C.L. Gogte, D.R. Peshwe

Abstract: The present work focuses on the study of improving the self-healing phenomenon of TPU reinforced with small amounts of MWCNTs. The selfhealing aliphatic TPU was reinforced with 1.3 mg of MWCNTs and the samples were exposed to UV radiation to accelerate the self-healing process. A decrease in crystallite size and increase in crystallinity of TPU is observed after addition of CNTs. Improved physical inter-locking between TPU and CNTs was confirmed thermo-gravimetric analysis. This indicates significant decrease in the thermal degradation tendency of TPU-CNT thin film. Remarkable changes in the morphology of scratch after CNT addition was observed, thus, indicating enhanced healing on UV exposure. The TPU-CNT gets heated rapidly resulting in the diffusion of TPU chains at the broken interface and their re-entanglement in order to heal the crack, where CNT’s act as bridging medium. Thus, it can be said here that during healing process CNT acts as an effective heat-transfer unit when interacting with the matrix.

Authors: Prajwal M, Sangamesha M.A, K. Pushpalatha

Abstract: In this study, weaver ant silk fibroin / highly conductive polymer (viz. polypyrrole and polyaniline) composites (WSF/PPY and WSF/PANI) were successfully prepared by in situ polymerisation, using silk fibroin from the weaver ant and conductive polymers. The properties of WSF/polymer composites have been investigated using optical microscope, Scanning Electron Microscope (SEM), Fourier Transform Infra Red (FTIR) spectroscopy and UV-visible spectroscopy. Surface morphology studies indicate that the conducting layer on the fibers is relatively compact and uniform. The FTIR analysis indicated the successful coating of the polymer by shifting of peaks in the spectra, and the spectrum for WSF showed amide I, amide II, amide III, C-H and C-O peaks, which were attributed to random coil and β-sheet conformation in the protein structure. The observed conductivity for the composites are in the range of 0.098856S cm- 1, 0.1Scm-1 and the average diameters are found to be 75±50nm, 70±25nm for PPy/WSF and PANI/WSF respectively. Nevertheless, the prepared composites are having good compatibility, the results of this work provided an evidence for the conducting properties and it may be a potential alternative matrix for application in wide areas such as medicine, defence, electronics, etc.

Authors: Md. Iqbal Bahar Chowdhury, Muhammad Johirul Islam, Md. Mahmudul Hasan, Md. Jahorul Islam, Sadia Ummey Farwah

Abstract: In this work, a cylindrical gate-all-around (CGAA) FET (field-effect transistor) structure with Indium Arsenide (InAs) nanowire is used as channel instead of silicon nanowire, and aluminium oxide is used as the gate dielectrics instead of silicon dioxide. The performance of this setup was demonstrated using ATLAS simulator of Silvaco TCAD software. Indium Arsenide is chosen due to its high electron velocity, high saturation velocity and low contact resistance, whereas, aluminium oxide is chosen because of its higher permittivity. Simulation results indicate that the proposed combination is superior to the CGAA structures having channel-gate dielectrics that use combinations of silicon-silicon dioxide and Indium Arsenide-silicon dioxide. The effects of variation of nanowire radius, channel length and oxide thickness on the output and transfer characteristics curves, and also on the performance parameters such as maximum drain current, maximum transconductance, on resistance and inverse subthreshold slope are investigated to show the superiority of the proposed structure.