MIT-World Peace University (MIT-WPU) is a top educational institute located in Pune, India. It is recognized within&nbsp;UGC under Government of Maharashtra Act No. XXXV 2017.&nbsp;

It is part of the MIT group of institutions (established in 1983) which covers 10+ campuses across India and has more than 50,000+ students enrolled across various disciplines at a given point of time. The institute houses 15 schools ranging from Engineering &amp; Technology, Design, Pharmacy, Commerce, Governance among others. It offers undergraduate, postgraduate and PhD programs among different disciplines.&nbsp;

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MIT World Peace University

Engineering and Technology

Our experimental observations shows that certain dyes when incorporated in solid polymer electrolytes (SPE) can serve as an excellent candidates for optical humidity sensing. Crystal Violet (CV) and Methylene Blue (MB) are incorporated in PVA/H3PO4, which is known to be a SPE and a good proton conductor. Films of PVA/H3PO4 containing dyes are studied for use in optical humidity sensing and the interesting results are discussed in this paper. A mechanism is proposed for the changes observed in the optical properties of such films by the variation of humidity. © 2001 Elsevier Science B.V. All rights reserved.

World University root node

School of Polymer Engineering

Sensors and Actuators, B: Chemical

Charge transfer complex-forming dyes incorporated in solid polymer electrolyte for optical humidity sensing

The structure development and mechanical properties of polypropylene (PP) composite containing polyethylene terephthalate (PET) fibres were studied both in the presence and absence of a compatibilizer such as maleic anhydride (MA). The structural and morphological studies were carried out by WAXD, optical microscopy and SEM techniques. In the absence of MA, the PET fibres in PP showed transcrystalline morphology and thus proved to be a strong nucleating agent for PP spherulites. On the other hand, in the presence of MA, no transcrystalline growth of PP was observed on the surface of PET fibres. The fibre to matrix bonding was better in presence of MA than without it, as was revealed by SEM of fractured surfaces. The mechanical properties viz. impact strength and tensile modulus showed enhancement for these composites as compared to pure PP. However, pronounced increase in the properties was seen for PET fibres filled PP composite without MA. The above findings could be understood in terms of high aspect ratio for PET fibres, transcrystalline morphology, good fibre-matrix adhesion and nucleating ability of PET fibres in PP matrix. © 2001 Elsevier Science Ltd.

Polymer

Structure development and properties of PET fibre filled PP composites

The structure development and crystallization behaviour of polypropylene (PP) containing nanoparticles of calcium phosphate prepared by a new route based on matrix mediated control of growth and morphology was investigated by X-ray diffraction (XRD), optical microscopy and DSC techniques. The results obtained were compared with that of PP containing conventionally prepared calcium phosphate (CaPO). Both nanoparticle filled PP as well as CaPO filled PP crystallized in monoclinic α crystalline phase. However, considerable changes were observed in the relative intensities of the XRD peaks, especially the peak II (040 reflection), in the case of PP filled with nanosize calcium phosphate. The isothermal crystallization curves showed dramatic increase of crystallization rate and decrease in t1/2 value for PP/nanoparticulate composites resulting in a rapid decrease in the ultimate spherulite size as compared to PP/CaPO samples. The nucleating efficiency was found to be dependent on the particle size as inverse exponential power law. These results were further confirmed by DSC analysis. The optical transparency of the PP/nanoparticle composites was found to be much higher than that containing conventional CaPO for the same concentrations and this could be associated with the reduction in the PP crystallite size. © 2001 Elsevier Science Ltd.

Structure development and crystallization behaviour of PP/nanoparticulate composite

This paper presents an autoassociator neural network for texture feature extraction. Texture features are extracted through the hidden layer of an autoassociator. The Resilient Propagation (RP) algorithm was employed to train the autoassociator with the texture input and output patterns. The performance of the feature extractor was evaluated on Brodatz benchmark database. A detail analysis of the results is included. The results and analysis showed that the autoassociator is capable of extracting texture features better than the other traditional techniques. © 2001 IEEE.

School of Computer Engineering & Technology

Proceedings - 4th International Conference on Computational Intelligence and Multimedia Applications, ICCIMA 2001

An autoassociator for automatic texture feature extraction

Nanosize particles of calcium phosphate were prepared by a new technique based on matrix mediated control of growth and morphology using polymer blends. The particle size could be reduced down to the order of 10 nm at a certain composition of the blend. These particles were stabilized and could be handled easily due to the polymer matrix surrounding them. Their crystal structure and size was confirmed by X-ray diffraction and electron microscopy. © 2000 Elsevier Science Ltd. All rights reserved.

Control of nanoparticle size of fillers by polymer blend technique

An isothermal crystallization behavior is observed for poly(propylene) (PP) on the surface of poly(ethylene terephthalate) (PET) fibers. The extensive nucleation on the fiber surface is followed by the development of a transcrystalline phase, while normal PP spherulites appear much later than the transcrystalline phase in regions far from the interface. The crystallization kinetics is followed by spot-intensity measurements at selected areas on the picture frame near the fibers, showing that the kinetics in the transcrystalline zone is quite different from that in the PP bulk. Furthermore, a preferential orientation of the b-axis and/or bc-planes of PP crystallites along the c-axis of PET fibers is found, suggesting that the crystal structure of the fiber material could also influence the development of this phase. © Wiley-VCH Verlag GmbH, 2001.

Macromolecular Materials and Engineering

Development of a transcrystalline phase in poly(propylene) at the PET interface

Nano-particles of γ-Fe2O3 were synthesized by reacting polyethylene oxide-FeCl3 complex with NH4OH. These were characterized by X-ray diffraction (XRD), scanning electron miscroscopy (SEM), selected area electron diffraction (SAED) and transmision electron microscopy (TEM). The average particle size was found to be 10 nm, as determined from the line broadening of the main XRD peak. The crystalline phase was a spinel-type tetragonal structure, which was confirmed from the electron diffraction pattern. The zero field cooled magnetization of samples with varying γ-Fe2O3 content as a function of temperature was measured using a vibrating sample magnetometer. The magnetization curves show a peak at low temperature (15 K) corresponding to the blocking temperature TB. The value of TB was found to decrease with decreasing particle size. The magnetization measurements with respect to field at 5 and 170 K confirmed the transition from superparamagnetic to spin-glass state at TB, as evidenced from the remanence and hysteresis. These results can be explained on the basis of Néel's theory of superparamagnetism as applied to nano-particles. © 2001 Elsevier Science Ltd.

Polyhedron

Polymer-mediated synthesis of γ-Fe2O3 nano-particles

Polypyrrole films containing phthalocyanine were deposited by direct electrochemical deposition method using mixed solvent system (NMP:H2O) with H2SO4 (0.1 M). The films obtained were characterized by conventional techniques such as FT-IR and UV-VIS, which confirmed the incorporation of phthalocyanine. The presence of Cu(2p) core level peak in the ESCA studies also confirmed the incorporation of phthalocyanine in these films. The electrical conductivity was found to increase with the increase of phthalocyanine concentration in the electrolyte. Even for a moderate increase of CuPc (from 1.0 to 2.0 mol%) in the PPy films, there is a drop in activation energy from 0.133 to 0.08 eV. Sensitivity measurements show that the CuPc containing PPy films are selectively more sensitive to the nitrogen dioxide vapours. The C-V studies carried out on these films under illumination show that the photochemical response in electrochemical mode increases due to the presence of phthalocyanine. The cathodic peak at -700 mV, which is associated with the phthalocyanine, becomes prominent under illumination due to photogenerated carriers. © 2001 Elsevier Science B.V.

Materials Letters

Electrical properties of conducting polypyrrole films functionalized with phthalocyanine

The transmission-line-matrix (TLM) numerical time-domain method using the symmetrical super-condensed node (SSCN) is applied to calculate the cross-talk time & frequency-response between tracks on a double-sided Vertical-PCB-on-backplane configuration over a frequency range of 50 MHz to 1 GHz. Meshing was done on a layer-wise basis which consisted of dividing the entire computational region into groups-of-vertical-layers in the XY plane, with each group of layers having the same mesh pattern. Extensive use was made of a recently introduced one and two dimensional multi-gridding technique to keep the total mesh count to a reasonable value. Perfectly-matched-layer absorbing boundary conditions were used and simulation was done for six PCB configurations for 100,000 time-steps, the time-step being 0.523 ps for a spatial resolution of 0.3175 mm. Simulation results compare well with the experimental data over the frequency range of interest.

School of Electronics & Communication Engineering

IETE Journal of Research

Modelling of PCB cross-talk using the transmission-line-matrix(TLM) method

The electrocatalytic property of the conducting polypyrrole (PPy) films doped with palladium chloride and irradiated with heavy ion beams was studied for methanol oxidation. The PPy films were electropolymerized on gold film coated glass plate electrodes, subsequently doped with different amounts of PdCl2 and then irradiated with 120 MeV, Au+ ions at a dose of 1012ions/cm2. The cyclic voltammograms (CVs) of these samples for methanol oxidation in 0.1 M HClO4 showed a four times increase in the anodic current as compared to the un-irradiated ones. These improvements in the electrocatalytic activity by ion beam irradiation could be associated with better complex formation between the dopant and conducting polymer matrix which was confirmed by the X-ray photoelectron spectroscopy (XPS) studies. © 2001 Elsevier Science B.V.