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

The structure development and crystallization behavior of poly(propylene) (PP) filled with wollastonite mineral was studied with respect to different particle sizes of the filler. The decrease in particle size led to increase in crystallization rates and decrease of crystallization half time, indicating greater nucleation efficiency for smaller sizes of the wollastonite particles. This was also reflected in the higher crystallinity values obtained for small filler particles. The WAXD analysis of PP/wollastonite revealed significant changes in the relative intensity of certain peaks (110 reflection) at small particle size, indicating preferential growth of PP on wollastonite. The exact co-relationship of nucleation rate/crystallization rate and the additive particle size (d) was determined which showed that for any given concentration of the additive, it was proportional to (1/d)3.

World University root node

School of Polymer Engineering

Macromolecular Materials and Engineering

Crystallization behavior in poly(propylene) containing wollastonite microfibrils

Electromechanical sensors and actuators are important for robotic and aerospace applications. Among various material, poly(vinylidene fluoride) ir its co-polymers are known to exhibit high piezosensitivity. However, due to their higher electrical resistivity the input impedance of subsequent signal processign circuits is required to be very high. A novel technique to decrease the impedance would be blending PVDF with conducting polyaniline (PANI) but without affecting the piezosensitivyt of PVDF. Polyaniline (PANI) was synthesized by well known standard chemical route using dopants HCl and dodecyl benzene sulfonic acid. These PANI powder were blended with PVDF which was first dissolved in DMAc at 50 degrees C to which were added requisite amounts of two types of PANI ranging from 2 to 25 wt percent, stirred for 24 hours to form a homogeneous mixture which was cast in glass petri-dish, followed by complete solvent evaporation at 50 degrees C and then drying under vacuum for 24 hours to give films of PANI-PVDF blends. The piezo-sensitivity of these blends was measured before and after poling in electrical field. The sensitivity factor was dependent on the composition, type of dopant as well as the electric polarization of the blend. The HCl doped PANI blends in PVDF were highly piezo-sensitive than other blend compositions. These various results have been explained on the basis of compatibility, discrete domain formation, nonlinear conduction process for charge transport, orientation of dipoles, and trapping of space charge at inter-domain sites.

Proceedings of SPIE - The International Society for Optical Engineering

Effect of dopant ions on piezo-response of polyaniline-poly(vinylidine flouride) blends

The conducting polymers such as polyaniline, polypyrrole and polythiophene were functionalized with copper phthalocyanine using chemical oxidation method. The obtained polymers viz. PANI-CuPc, PPy-CuPc and PT-CuPc were studied as chemical sensors by their response characteristics after exposure to various chemical vapors such as methanol, ammonia and nitrogen dioxide. The results obtained showed that these polymers have moderate sensitivity towards the methanol as well as ammonia vapors whereas they show tremendous sensitivity towards nitrogen dioxide vapors. The sensitivity factor of as high as 50,000 was obtained for PT-CuPc polymers in nitrogen dioxide. In comparison to this, the sensitivity factors of about 100 and 40 were obtained, when these polymers were exposed to ammonia and methanol vapors. The very high selectivity towards the nitrogen dioxide was explained on the basis of charge transfer complex formed between, the phthalocyanine donor and nitrogen dioxide acceptor molecules. On the other hand, ammonia becomes a competing electron donor in CuPc containing conducting polymers. The very low response towards the methanol may be explained on the basis very little charge transfer / interaction between CuPc containing polymers and methanol. Thus, CuPc incorporated conducting polymers have much higher selectivity than their original homopolymer.

School of Mechanical Engineering

Fulltext

Sensors

Conducting Polymers Functionalized with Phthalocyanine as Nitrogen Dioxide Sensors

Rhodamine 6G (R6G), an n-type dye, has been employed at small concentrations (0-15 mM/ monomer) for sensitizing conducting polyaniline (PANI) in solid-state photocells with the configuration Au/PANI/SPE + R6G/ITO. It is observed that a p-n junction is formed at the PANI/dye interface. The photosensitivity factor (S) is observed to be maximum at a dye concentration of 6.3mM/monomer. The variation of the dark (Id) and light (Ii) current with respect to the dye concentration in the linear portion of the current-voltage (I-V) characteristic reveals that light current goes through a maximum whereas dark current remains more or less constant. Thus, it is the variation of the light current (Ii) that is more important and is one of the reasons for maximum photosensitivity at a certain dye concentration. The mechanism of the dye-sensitization process is explained on the basis of the energy band diagram of the materials forming the photocell. The observed photosensitivity is due to the lowering of the potential barrier in the presence of light at the PANI/dye interface.

Journal of Materials Science: Materials in Electronics

Sensitization effect in conducting polyaniline by rhodamine 6G

The paper deals with the study related to electrical conductivity structure in the geothermal province of Bakreswar. Audio magnetotelluric (AMT) surveys have been carried out with a very close interval to identify the geological features related to the geothermal springs of the province. Initially, MT measurements in the geothermal province were carried out which show that the near surface structure in and around Bakreswar geothermal spring is 1D or 2D in nature and the structure is 3D at greater depth. The variation of resistivity even over a short distance near hot spring appears significant and therefore, detail AMT survey with closer station interval was carried out. 2D RRI model along the east-west profile passing through the Bakreswar hotsprings has been prepared. The study reveals that the source is not exactly below the hotsprings located over the fault which is continuing up to a depth of 200 - 300 m only. The fault cannot act as a source as it is not sufficiently deep to supply the heat to the hydrothermal system. A conducting zone of considerable size has been outlined in the west of Bakreswar which may act either as a partial or complete source.

School of Petroleum Engineering

2002 SEG Annual Meeting

Audiomagnetotelluric (AMT) investigations for 2D electrical conductivity modeling over geothermal province of Bakreswar, eastern India

Journal of geophysics (Hyderabad)

An analysis of magnetotelluric (MT) data over geothermal region of Bakreshwar, West Bengal

The effect of dye aggregation at the small concentration (0-4 mM/monomer) of dispersed Prussian Blue (PB) on the photocurrents were studied in solid state cells fabricated using conducting polypyrrole (Ppy) coated electrodes sandwiched with solid polymer electrolytes viz. polyvinyl alcohol (PVA) with phosphoric acid. These exhibit good photoresponse to visible light: photocurrents being 25 times more than that of the dark current values depending on the concentration of the sensitizer and the applied field. The sensitization increases with concentration of the dye at low concentrations but at high concentration formation of dye aggregates (H-type) has a negative impact on the photosensitization process. The current-voltage (I-V) characteristics in such cells reveal that the charge transport is mainly governed by the space charge effects and the sensitization effects are due to the lowering of the potential barrier formed at the Ppy/PVA+PB interface under photoexcitation.

Materials Chemistry and Physics

Effect of dye aggregation on the photosensitization effect of conducting polypyrrole sensitized with Prussian Blue

This paper describes a novel technique for texture feature extraction and classification. The proposed feature extraction technique uses an Auto- Associative Neural Network (AANN) and the classification technique uses a Multi-Layer Perceptron (MLP) with a single hidden layer. The two approaches such as AANN-MLP and statistical-MLP were investigated. The performance of the proposed techniques was evaluated on large benchmark database of texture patterns. The results are very promising compared to other techniques. Some of the experimental results are presented in this paper. Keywords: pattern recognition, feature extraction, neural networks © Springer-Verlag Berlin Heidelberg 2001

School of Computer Engineering & Technology

Lecture Notes in Computer Science (including subseries Lecture Notes in Artificial Intelligence and Lecture Notes in Bioinformatics)

Texture feature extraction and classification

Numerical results obtained by directly applying the perfectly-matched layer (PML) to an open boundary problem, i.e. the calculation of PCB crosstalk using the TLM, are presented. While evanescent waves cannot be absorbed even by a large number of PML layers, a single layer is sufficient provided it is placed sufficiently far away.

School of Electronics & Communication Engineering

Electronics Letters

Application of PML to open boundary problem using TLM method

Conducting polyaniline/barium titanate (PANI/BaTiO3) composites exhibiting piezoresistivity properties have been synthesized by the in situ deposition technique by placing a fine grade powder of BaTiO3 in the polymerization reaction mixture. The polyaniline was formed preferentially on the ceramic panicles giving a much higher yield for PANI than in absence of the BaTiO3 These composites exhibited piezoresistivity with the piezosensitivity being maximum at a certain composition. The current-voltage characteristics clearly revealed a nonlinear space charge controlled charge transport process. A large hysteresis in these characteristics was also observed which was dependent on the BaTiO3 content in a composite. The various results have been explained on the basis of the charge transport mechanism in the heterogeneous conducting material having insulating domains dispersed in it. © 2001 Materials Research Society.