Dr. Sharanappa Chapi
@bmsce.ac.in
Assistant Professor, Department of Physics, BMSCE Benglaruru
B. M. S. COLLEGE OF ENGINEERING, BENGALURU
EDUCATION
M.Sc. in Physics,
Ph.D. in Physics
RESEARCH, TEACHING, or OTHER INTERESTS
Condensed Matter Physics, Materials Science, Surfaces, Coatings and Films, Multidisciplinary
Scopus Publications
Scholar Citations
Scholar h-index
Scholar i10-index
Scopus Publications
Ashwini Rayar, Sharanappa Chapi, M.V. Gangadhar Murugendrappa, G. Babaladimath, K.N. Harish, Raghava Reddy Kakarla, and Anjanapura V. Raghu
Elsevier BV
Sharanappa Chapi, M. V. Murugendrappa, Ashwini Rayar, Gangadhar Babaladimath, Narasimha Raghavendra, Mohsen Khodadadi Yazdi, Jacek Ryl, and Mohammad Reza Saeb
Wiley
AbstractFlexible polymer electrolytes with effective electrochemical characteristics must be developed to meet smart electronic technology demands. The current investigation explores the solid polymer electrolytes (SPEs) prepared by solution‐casting technique, using polyethylene oxides (PEO) doped with KCl salt in different weight percentages. The effect of the dopant on the chemical interactions and structural, optical, thermal, electrical, and electrochemical properties were studied using various strategies. It was found that the incorporation of KCl salt to PEO results in a three order of magnitude enhancement in ionic conductivity of polymer matrix from 10−9 to 10−6 S cm−1. The PEO doped with 20 wt.% KCl salt exhibited the highest ionic conductivity (4.32 × 10−6 S cm−1) and low activation energy (0.25 eV). According to the thermal analysis, the thermal stability of the films improved as the dopant concentration increased. Further, the electrochemical strength improved with increasing dopant concentration, according to cyclic voltammogram experiments. From the results of all the characterizations, PEO loaded with 20 wt.% KCl SPE system is a suitable candidate for use as an electrolyte in energy storage devices such as solid‐state batteries.
K.N. Harish, Sathish Reddy, M.S. Dharmaprakash, Sharanappa Chapi, B.S. Surendra, H.S. Bhojya Naik, B. Vinay Kumar, and Anjanapura V. Raghu
Elsevier BV
Sharanappa Chapi
SAGE Publications
A class of polymeric materials known as “hydrogel products” have a hydrophobic structure that enables them to hold significant volumes of water in their three-dimensional networks. It is thought that it is of utmost importance that they can be used extensively in a variety of industrial, biomedical and environmental applications. In this view, I have synthesized a uniuqe hydrogel made from cellulose extracted from banana pseudostem (BPC). This hydrogel exhibits superabsorbent properties. The synthesis was achieved by free-radical graft copolymerization of poly 2-(acryloyloxy) ethyl trimethylammonium chloride copolymer N,N-dimethylacrylamide (AETAC- co-DMA) onto a BPC backbone using ammonium persulfate as the initiator and methylene bisacrylamide as the cross-linking agent. The graft copolymer was studied using FT-IR spectroscopy to confirm its structure. It was further characterized by field-emission scanning electron microscopy (FESEM) and thermogravimetric analysis (TGA) to determine its morphological and thermal properties, respectively. The Effect of various parameters of free-radical graft copolymerization on the swelling behavior of the hydrogel was studied and the optimized copolymer was used to conduct pH and salt sensitivity tests on the hydrogel. The maximum water uptake of the hydrogel was found to be 427 g/g under optimum conditions of initiator, monomer and cross-linker concentrations of 0.0657 mol/L, 1.6 mol and 0.0972 mol/L correspondingly. The hydrogel was found to be pH and salt-sensitive and the salt uptake followed the order KCl>NaCl>CaCl>FeCl3. The excellent water absorbency, pH and salt responsiveness of the prepared hydrogel suggest its applicability not only in agriculture and wastewater treatment, but also in biomedicine for the controlled release of drugs.
Javali Kotresh Madhukesh, Gosikere Kenchappa Ramesh, Sabir Ali Shehzad, Sharnappa Chapi, and Ingalagondi Prabhu Kushalappa
Informa UK Limited
Gangadhar Babaladimath, Ashwini Rayar, and Sharanappa Chapi
Springer Science and Business Media LLC
Sharanappa Chapi
Springer Science and Business Media LLC
Channaveerappa Ayyappa Harihar, Challakere Gurumurthy Renuka, Hanumanthappa Gudami Basavaraj, Yellappa Sangappa, Sharanappa Chapi, and Rajappa Madhu Kumar
AIP Publishing
Chapi Sharanappa and Hundekal Devendrappa
AIP Publishing
Preparation of polyblend electrolyte of Poly (ethylene oxide), Poly (vinyl pyrrolidone) and doped cobalt chloride at 45:45:10 wt% compositions by spin-coat technique on quartz substrate. The obtained solvent free solid polymer (PEO/PVP/CoCl2) electrolyte film of ∼42 µm thin onto periodically patterned substrate. The surface morphology was carried using scanning electron microscope (SEM). The cyclic voltammogram study confirms that the polymer blend with the existence of cobalt units (Co2+) is more stable in the electrochemical environment. The studies on the electrochemical and morphological properties of polymer blend electrolyte have attracted much attention in view of their applications in electronic and optical devices, like electro-chromic display devices, fuel cells, gas sensors, solid state batteries etc.
Ibrahim Dankane, Sharanappa Chapi, and Kabiru Bello
AIP Publishing
Ashwini Rayar, , Sharanappa Chapi, and
Sumy State University
Sharanappa Chapi and
Sumy State University
The nanocomposite solid polymer electrolytes of Poly (ethylene oxide)/Polyvinylpyrrolidone doped with different concentrations (wt.%) of Zinc oxide nanoparticles (ZnO NPs) are prepared on quartz substrates using Spin-coat process. The Co-precipitation process is used to synthesize the ZnO NPs. The prepared nanocomposite polymer electrolytes were characterized by structural (XRD), morphological (SEM) and electrochemical (CV) studies. The spin-coating method is considered to be one of the most prominent due to the advantages of low cost and imperfection free uniform coating of resistant layers in the production of integrated circuits, surface coating and also acts as an intermediate insulator in different applications. The XRD analysis revealed the formation of nanostructures with (1 0 1) orientation in thin films which exhibits hexagonal Wartzite structure. All of the findings are correlated and discussed. The PEO/PVP/6 wt.% zinc oxide nanocomposite showed up to 500th cycles of reversible electrochemical response. The obtained results represent that nanocomposite solid polymer electrolytes based on ternaries are prominent materials for the use of transparent optoelectronic devices and solid-state batteries.
Ashwini Rayar, Gangadhar Babaladimath, Ambresh Ambalgi, and Sharanappa Chapi
Elsevier BV
C. A. Harihar, Sharanappa Chapi, K. S. Harisha, H. G. Basavaraj, D. B. Ashwini, Y. Ambruta, and R. Madhukumar
Author(s)
The current study deals with the synthesis, characterization of silver nanoparticles using gellan gum based silver nanocomposite materials using microwave radiation assisted method at room temperature. The resultant products have been confirmed to be Ag-Nanocomposite was carried out based on UV-Vis spectroscopy (440 nm), The UV-visible spectra showed that the characteristic of Ag nanoparticles surface Plasmon resonance (SPR) band exhibits an absorbance peak around at around 450 nm. The transmission electron microscope (TEM) images show that the formed nanoparticles were spherical in shape with smooth surfaces. The particle diameter was around 50-100 nm. Further the X-ray diffraction (XRD) analysis confirms the nanocrystalline phase of silver with face centered cubic (FCC) crystal structure and interesting results are discussed in this report.The current study deals with the synthesis, characterization of silver nanoparticles using gellan gum based silver nanocomposite materials using microwave radiation assisted method at room temperature. The resultant products have been confirmed to be Ag-Nanocomposite was carried out based on UV-Vis spectroscopy (440 nm), The UV-visible spectra showed that the characteristic of Ag nanoparticles surface Plasmon resonance (SPR) band exhibits an absorbance peak around at around 450 nm. The transmission electron microscope (TEM) images show that the formed nanoparticles were spherical in shape with smooth surfaces. The particle diameter was around 50-100 nm. Further the X-ray diffraction (XRD) analysis confirms the nanocrystalline phase of silver with face centered cubic (FCC) crystal structure and interesting results are discussed in this report.
Sharanappa C, Ambresh P Ambalgi, and Gangadhar Babaladimath
Elsevier BV
Gangadhar Babaladimath and Sharanappa Chapi
Springer Science and Business Media LLC
L. Yesappa, M. Niranjana, S. P. Ashokkumar, H. Vijeth, Chapi Sharanappa, S. Raghu, and H. Devendrappa
Springer Science and Business Media LLC
M. H. Kantli, Sharanappa Chapi, and Ambresh Ambalgi
IEEE
In this paper comprise the biorthogonal and orthogonal wavelet preconditioned method is used for the solution of Electrohydrodynamic flow problem. A finite difference method is used for the solution of Electrohydrodynamic flow equation. Wavelet based numerical schemes for the Electrohydrodynamic flow problem, for computing fluid velocity, covering wide range of Hartmann electric number (Ha) parameter with constant of practical interest. To confirm and validate the solutions obtained, by the present methods, are compared with those obtained by GMRES method.
H. Vijeth, M. Niranjana, L. Yesappa, Sharanappa Chapi, S. Raghu, S. P. Ashokkumar, and H. Devendrappa
Author(s)
Conducting polythiophene (PTH)/aluminium oxide (Al2O3) composites was prepared with camphor sulphonic acid (CSA) as s anionic surfactant by means of in situ chemical oxidation polymerization. The morphology and material phase of PTH/Al2O3 (PTHA) composites were investigated by Field-Emission Scanning Electron Microscopy (FESEM) and Energy-dispersive X-ray spectroscopy (EDX). The FESEM image shows alter the size of grain and EDX results consistent with the presence of Al2O3 and CSA chemical composition. Thermal stability of composites was characterized using TGA/DSC, the results indicate that the PTP/Al2O3 composites have higher thermal stability than that of PTP and decompose at higher temperatures due to addition of anionic surfactant.
L. Yesappa, M. Niranjana, S. P. Ashokkumar, Vijeth, Sharanappa Chapi, S. Raghu, and H. Devendrappa
Author(s)
Conjugating Polyaniline (PANI) composites have many interesting optical property useful in optical device applications. The pure PANI and PANI-Lithium perchlorate composites (PL1 & PL10) were prepared by chemical reaction method. The composites are characterized with the help of FT-IR, SEM and UV-Vis to confirm the chemical interactions, change in surface morphology and optical changes respectively. The direct optical band gap was found decreased from 3.89 to 2.97eV with increasing the LiClO4. The obtained results suggesting these polymer composites are suitable candidates for optoelectronics display, electrode material and electrochromic devices.Conjugating Polyaniline (PANI) composites have many interesting optical property useful in optical device applications. The pure PANI and PANI-Lithium perchlorate composites (PL1 & PL10) were prepared by chemical reaction method. The composites are characterized with the help of FT-IR, SEM and UV-Vis to confirm the chemical interactions, change in surface morphology and optical changes respectively. The direct optical band gap was found decreased from 3.89 to 2.97eV with increasing the LiClO4. The obtained results suggesting these polymer composites are suitable candidates for optoelectronics display, electrode material and electrochromic devices.
M. Niranjana, L. Yesappa, S. P. Ashokkumar, H. Vijeth, Sharanappa Chapi, S. Raghu, and H. Devendrappa
Author(s)
Polyaniline and its composites at different compositions of Vanadium pentoxide (PCV3 and PCV5) were prepared by simple in-situ chemical polymerization method. The composites were characterized using UV/Vis spectrophotometer and impedance analyzer of frequency range from 20Hz to 1MHz at room temperature. The UV-Vis absorption exhibits the red shift in the visible region and direct optical band gap was found to decrease from 2.72eV to 2.65eV with increasing the V2O5 concentration. The electrical conductivity and dielectric constant results vary with frequency. The maximum electrical conductivity obtained is for PCV5 and these polymer composites are prominent candidates for super capacitor and optoelectronics display etc.
Sharanappa Chapi and H. Devendrappa
Springer Science and Business Media LLC
Sharanappa Chapi, Raghu S., and Devendrappa H.
Springer Science and Business Media LLC