Rashmi Aradhya

Scopus Publications

Performance Enhancement of Epoxy Glass Fiber Cores of HTLS Conductors Using Carbon Nanofillers/ATH Additives
Madhu Bilugali Mahadevaswany, Rashmi Aradhya, Anandraj Shetru Nagarajappa
Macromolecular Symposia, 2026
Epoxy glass fiber nanocomposites reinforced with carbon nanofillers have garnered significant attention due to their improved functional capabilities, making them a desirable choice for an array of applications. This study investigates the effect of graphene and multi‐walled carbon nanotubes combined with aluminum trihydrate fillers on the mechanical and thermal performance of epoxy glass fiber cores used in high temperature low sag conductors. The inclusion of aluminum trihydrate and nanofillers significantly enhanced the properties of the composite, as evidenced by a reduction in the coefficient of linear expansion from 2.99 × 10 − 6 to 2.05 × 10 − 6 , improved dimensional stability, and increased density from 2.2 to 2.24 g/cm 3 . Thermal endurance tests at 150°C and 200°C for 1 and 2 h demonstrated negligible discoloration and no cracking in aluminum trihydrate (ATH) ‐modified cores, while cores without ATH exhibited cracking under prolonged exposure. Mechanical testing revealed a substantial improvement in ultimate tensile strength (UTS) from 32.17 kN (400.18 MPa) to 67.68 kN (839.01 MPa), an increase in the glass transition temperature (T g ) from 119°C to 133.65°C, and enhanced flexural strength from 61.82 to 73.31 MPa. These results highlight the superior thermal and mechanical performance of epoxy glass fiber cores reinforced with carbon nanofillers and ATH, making them suitable for high‐temperature, high‐stress applications in high‐temperature low‐sag (HTLS) conductors. Further studies are needed to investigate long‐term aging effects and optimize these composites for extended service life.
Development of PLA-ZnO Nanocomposites for Food Packaging Applications
Rashmi Aradhya, Lalithamba H.S., Madhu B.M., Sheshashayan, Pramath S.
Macromolecular Symposia, 2026
Vegetables and fruits are widely consumed and highly perishable commodities, developing effective packaging materials essential to extend their shelf life while maintaining quality and safety. A Packing material with excellent tensile strength is eco‐friendly, non‐toxic, and better alternative to polyethylene material. The present work explores the utilization of zinc oxide (ZnO) nanoparticles embedded within Polylactic Acid (PLA) as an innovative packaging material. The PLA is used in a wide range of applications, such as health care, implants, memory devices, food packaging, and tissue engineering, because it is biodegradable in nature. The addition of ZnO into PLA enhances electrical, mechanical, anti‐UV, and antibacterial properties. The PLA‐ZnO composites were prepared by the solution‐blending method. The Tensile strength and modulus of PLA‐ZnO nanocomposites increase as compared with the virgin PLA. The results from electrical properties exhibit a significant enhancement in dielectric constant and a decrease in dissipation factor of the nanocomposite. In addition, antibacterial results show that the prepared nanocomposite films exhibit strong antimicrobial ability at very low ZnO addition. The results demonstrate that the novel nanocomposites could be a good candidate material for food packaging applications.
Investigating Percolative AC Conductivity in Hybrid Carbon-Epoxy Composites through Electrical and Optical Techniques
B.M. Madhu, Rashmi, P Suma
IEEE Transactions on Dielectrics and Electrical Insulation, 2026
Carbon nanoparticle reinforced polymer nanocomposites have emerged as promising multifunctional materials due to their enhanced unique functional properties. In this study, hybrid epoxy–glass fiber nanocomposites incorporating multiwalled carbon nanotubes and graphene nanoplatelets were fabricated using a scalable pultrusion technique with varying nanofiller loadings. The AC electrical conductivity was evaluated over a wide frequency range of 10 Hz–8 MHz, while optical characteristics were investigated using UV–Vis spectroscopy and X-ray diffraction analysis. The influence of carbon nanofillers on AC conductivity, absorption coefficient, and optical band gap energy was systematically examined. The AC conductivity followed classical percolation theory, revealing a percolation threshold of 1 wt.% for hybrid nanofillers, lower than individual fillers, indicating a strong synergistic effect. The formation of an interconnected three-dimensional conductive network significantly enhanced conductivity from the insulating regime (~10⁻⁷ S/m) to 1.86 S/m at 1 kHz, corresponding to an improvement of nearly six orders of magnitude. Frequency-independent conductivity plateaus at low frequencies suggested semiconducting behavior consistent with Jonscher’s power law. Optical studies demonstrated a concentration-dependent change in absorption coefficient and a red shift in the absorption edge with increasing nanofiller content. Tauc analysis showed a reduction in optical band gap energy from 3.1 eV for pristine epoxy to 2.95 eV for hybrid systems, attributed to defect-induced localized states and improved charge transport pathways. XRD results confirmed the predominantly amorphous nature of epoxy matrix with characteristic graphene-related diffraction peaks. The UV-Vis spectra show a significant shift in the absorption peak with increasing concentration of carbon nanoparticles. The findings of this study have implications for the development of novel nanocomposites with enhanced performance for a variety of applications, including electronics and energy storage.
Thermal Aging Analysis and Predictive Modeling of Epoxy Nanocomposites Characteristics
Madhu B. M., Rashmi Aradhya, Suma P.
Journal of Vinyl and Additive Technology, 2026
This study investigates the thermal aging of glass fiber reinforced epoxy nanocomposites, focusing on chemical degradation mechanisms and the mitigating role of thermal conductivity for high‐temperature low‐sag conductor core applications. Composites with hybrid nanofillers containing multiwalled carbon nanotubes, graphene nanoplatelets, and aluminum trihydrate were aged at 120°C and 160°C for 3000 h. Thermal aging induced chemical degradation, with a 10‐fold increase in oxidation rate at 160°C due to chain scission. Carbonyl formation and hydroperoxide intermediates were formed in the composites. Tensile strength reduction of 8.6% in base composites is observed compared to 6.5% in the nanocomposite with hybrid nanofillers. Hybrid nanofillers reduce degradation by limiting oxygen diffusion, cooling the matrix, and stabilizing Tg, outperforming literature‐reported reductions of 7%–12% for similar composites. Thermal conductivity, modeled using Maxwell–Garnett, shows an enhancement of 40%–60% with nanofiller content and 10%–20% in the Bruggeman model. This slows heat diffusion, further mitigating aging. Transient heat flow analysis confirmed a 20%–30% longer diffusion time enhancing thermal stability. The nanocomposite retained 474.56 MPa tensile strength post‐aging, meeting high‐temperature low‐sag (HTLS) conductor standards. These findings elucidate the interplay between thermal aging, chemical degradation, and thermal conductivity, highlighting the potential of hybrid nanofillers for durable HTLS applications.
Green synthesis of graphitic nanofillers and analysis of 3D-printed graphitic nanofiller-reinforced PLA nanocomposites by impedance spectroscopy
B. V. Triveni, H. S. Lalithamba, Rashmi, G. K. Prashanth
Journal of Materials Science Materials in Electronics, 2025
Electrical and Thermal Properties of Boron Nitride Filled Poly Aryl Ether Ketone Composites for Electrical Insulation Applications
Rashmi Aradhya, B. M. Madhu
Polymers for Advanced Technologies, 2025
Poly(aryl ether ketone) (PAEK) composites incorporating boron nitride (BN) fillers at varying loadings of 10, 20, and 30 wt.% were fabricated and systematically examined for their dielectric and thermal performance, targeting electrical insulation applications. The impact of BN content on the microstructural features, thermal transport, and electrical characteristics of the composites was analyzed. Scanning electron microscopy (SEM) was employed to study the filler dispersion within the PAEK matrix. At higher filler loadings, BN particles with smaller sizes exhibited noticeable agglomeration, whereas larger BN particles demonstrated more uniform distribution throughout the matrix. Composites reinforced with larger BN particles exhibited greater enhancement in thermal conductivity. The dielectric constant ( ε r ) exhibited a progressive rise with increasing BN content, while the dissipation factor (tan δ ) initially decreased up to 10 wt.% loading and showed a slight rise thereafter up to 20 wt.%. A maximum improvement of approximately 34% in dielectric strength was recorded at 30 wt.% BN relative to PAEK. Across the temperature range of 30°C to 230°C, the dissipation factor and electrical conductivity were observed in the ranges of 0.001–0.310 and 3.0 × 10 −11 to 0.5 × 10 −16 S/cm, respectively. The composite containing 30 wt.% BN exhibited a substantial increase in thermal conductivity, rising from 0.3 to 0.6 W/m K, alongside superior dielectric properties ( ε r ≈5.5 and tan δ ≈0.01) and lower volatile content. These findings highlight the potential of BN‐filled PAEK systems as promising candidates for electrical insulation in winding systems, rotating machines, and cable sheathing applications.
Low frequency dielectric analysis for understanding water absorption characteristics of epoxy nanocomposites
Rashmi Aradhya, B. M. Madhu, J. Sundara Rajan
Polymer Composites, 2025
Nanocomposites are versatile multifunctional engineering materials. For electrical applications, diminishing water diffusion and optimization of electrical properties are challenging. Low frequency dielectric measurements are preferred for the assessment of water diffusion because of the dominant low frequency response in the presence of water. Epoxy composites with organically modified montmorillonite of 2, 5, and 7 wt% are investigated. Filler at 5 wt% is observed to be optimal, with a 28% reduction in the diffusion coefficient. Higher filler content decreases the real permittivity due to interfacial polarization, and water diffusion for 240 h reveals minimal filler dependence of real permittivity. The relaxation peak of imaginary permittivity occurs at 0.08 Hz at 5 wt%, and at higher frequencies in other composites due to changes in the filler matrix interactions and electrical conductivity. Water diffusion tends to decrease imaginary permittivity. AC conductivity is not influenced by the filler and it ranges from 10−10 to 10−9 S/m over 10−4 Hz–1 kHz, and its variations with water diffusion at lower frequencies are not significant. The differences in the nanocomposites are confirmed using FTIR analysis. The multi‐core water shell model is correlated to the variations observed in the dielectric properties of the nanocomposites. The utility of low frequency dielectric analysis is demonstrated for the assessment of water diffusion. Key application areas of low frequency dielectric analysis are the estimation of water diffusion mechanisms and it is an enabler of the development of data analytics using machine learning for improving the quality of nanocomposites.Highlights 5 wt% OMMT addition offers optimal water barrier performance in epoxy composites. Surface‐modified OMMT enhances filler distribution and interfacial adhesion. Dielectric loss peaks shift to 0.08 Hz at 5 wt% filler content. AC conductivity remains stable at 10−10–10−9 S/m across frequencies. Low‐frequency dielectric analysis accurately models water absorption.
Enhancement of electrical conductivity and band gap of epoxy/MWCNT/GNP/glass fibers hybrid materials
Madhu B M, Rashmi Aradhya
Journal of Adhesion Science and Technology, 2025
Polymer composites containing carbon nanoparticles have attracted considerable attention because of their special functional characteristics. Characterization of optical and dielectric characteristics was done. To comprehend the impact of nanofillers, dielectric characteristics, UV–Vis spectroscopy, XRD, and Fourier transform spectroscopy were employed. The role of carbon fillers on metrics, such as band gap energy, absorption coefficient, and dielectric characteristics of nanocomposites was examined to differentiate between the effects of nanofillers. The AC conductivity is explained following the classical percolation theory. The percolation threshold is discovered to be 1 wt.% of a hybrid system of nanofillers consisting of graphene nanoplatelets (GNPs) and multi-walled carbon nanotubes (MWCNTs). The presence of carbon nanofillers significantly enhances the electrical conductivity of the nanocomposites. The optical band gap energy of nanocomposites was obtained from the Tauc method. The study establishes the relationship between band gap energy and AC conductivity using Tauc's relation and Jonscher's power law. The results show that the band gap energy of composites decreases with the addition of hybrid nanofillers, with values observed at 2.65 eV and 2.95 eV, while without fillers of 3.1 eV and 3.05 eV attributed to increased localized states within the bandgap. Composites with nanofillers show an AC conductivity of 1.86 S/m at 1 wt% of nanofillers, compared to 1.52 × 10−6 S/m and 1.09 × 10−6 S/m for composites without nanofillers. The UV–Vis spectra reveal a significant blue shift in the absorption peak when the weight percentage of carbon nanoparticles is increased. The findings of this study point toward the possibilities of the development of novel nanocomposites with enhanced performance for electronics and energy storage.
Study of Nanocomposites for Food Packaging Applications: An Overview
Rashmi Aradhya, B. M. Madhu
Springer Proceedings in Materials, 2025
Impact of organically modified montmorillonite clay nanofiller on free volume and electrical properties of the composites
R. Aradhya, M. B M, Sundara Rajan Jagannathan
Materials Research Innovations, 2025
Assessment of water diffusion in epoxy composites: a novel approach towards holistic understanding
Rashmi Aradhya, Madhu B M, Sundara Rajan J
Advanced Composite Materials, 2025
Development and Characterization of Polymer Nanocomposites for Electrical Insulation Application
Rashmi Aradhya, Sheshashayan S, Pramath Srivathsa M
International Conference on Smart Systems for Applications in Electrical Sciences Icsses 2025, 2025
Cerium oxide nanoparticles: sustainable synthesis and diverse applications in electrical properties, catalysis and biomedicine
H. S. Lalithamba, G. K. Prashanth, H. K. E. Latha, Rashmi, Aisha Siddekha, G. Nagendra
Chemical Papers, 2025
Development and Characterization of Ethylene-Vinyl Acetate-Graphene Nanocomposites
Madhu Bilugali Mahadevaswamy, Rashmi Balasubramanya
Macromolecular Symposia, 2024
Hydrothermal aging of glass fiber epoxy-carbon nanocomposites and its service life predictions based on tensile strength
Madhu B M, Rashmi Aradhya, Sundara Rajan J.
Journal of Vinyl and Additive Technology, 2024
Simulation study of Effects of Alumina Nanoparticle Interactions in Polymer Matrix
Rashmi Aradhya, B.M. Madhu
International Conference on Smart Systems for Applications in Electrical Sciences Icsses 2024, 2024
Impact of TiO2nanofiller on Electrical and Mechanical properties of Epoxy nanocomposites
Rashmi Aradhya, B.M. Madhu
International Conference on Smart Systems for Applications in Electrical Sciences Icsses 2024, 2024
Impact of water diffusion on electrical properties of epoxy nanocomposites
Madhu Bilugali Mahadevaswamy, Rashmi Aradhya, Sundara Rajan Jagannathan
Journal of Adhesion Science and Technology, 2024
Electric Circuit Modeling of Impedance Spectroscopic Characteristics of GFRP Nanocomposites with Hybrid Carbon Nanofillers
B. M. Madhu, Rashmi, R. R. N. Sailaja, Rajan J. Sundara
Foundation and Growth of Macromolecular Science Advances in Research for Sustainable Development, 2024
An insight into the effect of carbon nanofillers in glass fibre epoxy nanocomposites through dielectric spectroscopy
Madhu Bilugali Mahadevaswamy, Rashmi Aradhya, Sundara Rajan Jagannathan, Sailaja Bhattacharya
Fullerenes Nanotubes and Carbon Nanostructures, 2024
Plant mediated synthesis of CaO nano-particles and investigation of morphological, spectroscopic, electrical, and catalytic properties
H. S. Lalithamba, Aisha Siddekha, Rashmi, B. V. Triveni
Journal of Materials Science Materials in Electronics, 2023
Dynamic mechanical analysis for assessment of carbon fillers in glass fiber epoxy composites
Rashmi Aradhya, J. Sundara Rajan
Polymer Composites, 2023
Impact of electrical percolation on mechanical, thermal and flame properties of carbon filler-epoxy composites
Rashmi, Poornima, J. Sundara Rajan
Polymer Composites, 2023
Novel Dual Output AC/DC Power Supply Using Switched Transformer Forward Converter with Active Front End Power Factor Correction
Srinivas N R, Rashmi Aradhya
International Conference on Smart Systems for Applications in Electrical Sciences Icsses 2023, 2023
Recent Trends in Development of Soft Magnetic Material for Power Electronics Applications: A Review
Rashmi Aradhya, R Santhosh Kumar, Sundara Rajan J.
International Conference on Smart Systems for Applications in Electrical Sciences Icsses 2023, 2023
Effect of thermal ageing on electrical, mechanical properties of glass fiber reinforced polymer and its impact on service life
Madhu Bilugali Mahadevaswamy, Rashmi Aradhya, Sundara Rajan Jagannathan
International Journal of Polymer Analysis and Characterization, 2023
Study of Electrical and Magnetic Properties of Zn-Co-Ferrite Nanocomposites
R. Santhosh Kumar, Rashmi ., H. S. Lalithamba
Journal of Mines Metals and Fuels, 2022
The effect of MWCNT and GNP on the Flame Retardant Properties of Glass Fiber Reinforced Composites
Rashmi ., B. M. Madhu``, Poornima ., J. Sundara Rajan
Journal of Mines Metals and Fuels, 2022
Comparative Study on the Effect of Aluminium Trihydrate and Carbon Nanofillers on Thermal Properties of Glass Fiber Reinforced Epoxy Composites
B. M. Madhu, Rashmi ., R. R. N. Sailaja, J. Sundara Rajan
Journal of Mines Metals and Fuels, 2022
Effect of hybrid carbon nanofillers at percolation on electrical and mechanical properties of glass fiber reinforced epoxy
Madhu Bilugali Mahadevaswamy, Rashmi Aradhya, Sailaja Bhattacharya, Sundara Rajan Jagannathan
Journal of Applied Polymer Science, 2022
Combined effect of multiwalled carbon nanotubes, graphene nanoplatelets, and aluminum trihydride on the thermal stability of epoxy composites
Madhu B. M., Rashmi, Sailaja R. R. N., Sundara Rajan J
Polymer Composites, 2022
Implementation of Optocoupler Test Fixture in Incoming Quality Control
S. G. Yashaswini, Rashmi
Lecture Notes in Electrical Engineering, 2022
Recent Advances in Nanocomposite Soft Magnetic Materials: A Review
R Santhosh Kumar, Rashmi, J. Sundara Rajan
2022 IEEE International Conference on Nanoelectronics Nanophotonics Nanomaterials Nanobioscience and Nanotechnology 5nano 2022, 2022
Contrasting role of carbon nanofillers in electrical conduction and mechanical strength of epoxy composites: an investigation
Rashmi Aradhya, Poornima Venkataramanaiah, Sundara Rajan Jagannathan
International Journal of Polymer Analysis and Characterization, 2022
Effect of Hybrid Fillers on GFRP Epoxy Composites with Water Immersion and Thermal Conditioning
Rashmi Balasubramanya, R. R. N. Sailaja Bhattacharya, Madhu B. M.
Macromolecular Symposia, 2021
Analysis of Epoxy Nanocomposites Characteristics by Impedance Spectroscopy
Rashmi, R. R. N. Sailaja, B. M. Madhu
Macromolecular Symposia, 2021
Investigations on the effect of hybrid carbon fillers on the thermal conductivity of glass epoxy composites
Poornima Venkataramanaiah, Rashmi Aradhya, Sundara Rajan J
Polymer Composites, 2021
Effective use of nano-carbons in controlling the electrical conductivity of epoxy composites
Poornima, Rashmi, J. Sundara Rajan
Composites Science and Technology, 2021
Design and simulation of interleaved SEPIC converter for photo voltaic applications
Poornima, Rashmi
6th International Conference on Computation of Power Energy Information and Communication Iccpeic 2017, 2017
A comparative study and performance analysis of synchronous SEPIC Converter and synchronous Zeta Converter by using PV system with MPPT technique
Rashmi, Manohar J., Rajesh K.S.
1st IEEE International Conference on Power Electronics Intelligent Control and Energy Systems Icpeices 2016, 2017
Overview of different overhead transmission line conductors
Rashmi, G.S. Shivashankar, Poornima
Materials Today Proceedings, 2017
Speed control of BLDC motor using PV powered synchronous Zeta converter
Rashmi, Manohar J, Rajesh K S
2016 International Conference on Computation of Power Energy Information and Communication Iccpeic 2016, 2016
A comparative study on DC motor drive fed by synchronous SEPIC converter and synchronous Zeta converter
Rashmi, Manohar J, Rajesh K S
2016 International Conference on Computation of Power Energy Information and Communication Iccpeic 2016, 2016
Biological effects of electromagnetic interference of high voltage transmission lines on human body
M. Kavya, B. Yashodhara, V. Arunachalam, D. Devendranath, A. Yellaiah, Rashmi, R. R. N. Sailaja
2014 International Conference on Power Signals Control and Computations Epscicon 2014, 2014
Effect of montmorillonite clay content on ac conductivity and impedance of Epoxy-based nanocomposites
Rashmi, Nijagal Marulaiah Renukappa, Kunigal N. Shivakumar, Siddaramaiah
International Journal of Materials Research, 2013
PMSG based isolated wind energy conversion system (WECS) for variable load
Ruchika, Ritika Gour, Pulkit Jain, Rashmi, Rajveer Mittal, S.S. Deswal
India International Conference on Power Electronics Iicpe, 2012
Electrical discharge resistant characteristics of nanodielectrics
Rashmi, N. M. Renukappa, Kunigal N. Shivakumar, M Manjunath
Proceedings of the IEEE International Conference on Properties and Applications of Dielectric Materials, 2012
Effect of TiO2 and oMMT nanofiller on thermal conductivity and heat deflection temperature of nanodielectric composites
N M Renukappaa, Rashmi, Kunigal N Shivakumar, M Manjunatha, P. Sampath Kumaran
Proceedings of the IEEE International Conference on Properties and Applications of Dielectric Materials, 2012
Montmorillonite nanoclay filler effects on electrical conductivity, thermal and mechanical properties of epoxy-based nanocomposites
Rashmi, N.M. Renukappa, Ranganathaiah Chikkakuntappa, N. Shivakumar Kunigal
Polymer Engineering and Science, 2011
Dry sliding wear behaviour of organo-modified montmorillonite filled epoxy nanocomposites using Taguchi's techniques
Rashmi, N.M. Renukappa, B. Suresha, R.M. Devarajaiah, K.N. Shivakumar
Materials and Design, 2011
Investigation of dielectric behaviors of nanoclay filled epoxy and PP/NYLON66 nanocomposites for cable insulation application
Rashmi, N. M. Renukappa, Siddaramaiah
Aip Conference Proceedings, 2010
Experimental investigation of the influence of clay on dielectric properties of epoxy nanocomposites
Rashmi, N.M. Renukappa, G. Swaminathan, Siddaramaiah
Proceedings of the IEEE International Conference on Properties and Applications of Dielectric Materials, 2009

Rashmi Aradhya

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