Article
Thermodynamics
S. Sankar, M. T. Ramesan
Summary: This article investigates the effect of Cu-Al2O3 reinforcement on the structural, thermal, and temperature-dependent AC parameters of PANI-co-PPy composites. The study finds that the addition of Cu-Al2O3 enhances the conductivity and dielectric properties of the composites, making them suitable for durable electronic devices.
JOURNAL OF THERMAL ANALYSIS AND CALORIMETRY
(2022)
Article
Polymer Science
Umesh S. Waware, Mohd Rashid, G. J. Summers, A. M. S. Hamouda, Rohana Adnan
Summary: The study focused on the highly uniform ac conductivity and dielectric permittivity of poly(aniline-co-o-nitroaniline) (PA-co-o-NA)s, as well as the unusual electrical behavior of PA-co-o-NA80 at low frequencies. Various techniques, including X-ray diffraction and thermogravimetric analysis, were used to analyze the crystallinity and thermal stability of the copolymer, with results indicating higher stability and smoother surface compared to PAni.
Article
Physics, Applied
Amirreza Shayganpour, Marialaura Clausi, Ilker S. Bayer
Summary: Hematite and graphene nanoplatelet hybrids were prepared in a rubbery latex matrix in this study, showing promising thermal properties. Optimization of filler concentration and ratio yielded thermal interface material films with enhanced heat dissipation and rapid heat transfer capabilities.
APPLIED PHYSICS LETTERS
(2021)
Article
Materials Science, Multidisciplinary
S. Sankar, Ajith George, M. T. Ramesan
Summary: Copper alumina reinforced poly(aniline-co-indole) nanocomposites were prepared and characterized. The addition of Cu-Al2O3 decreased the bandgap energy and increased the glass transition temperatures. The nanocomposites also showed improved electrical conductivity.
MATERIALS SCIENCE AND TECHNOLOGY
(2023)
Article
Chemistry, Multidisciplinary
Anastasiia N. Andriianova, Timur T. Sadykov, Akhat G. Mustafin
Summary: This study reported the synthesis of novel (co)polymers based on aniline and its ortho-substituted derivative, and investigated their electrical conductivity, morphology, solubility, electrochemical properties, spectral and thermal characteristics. It was found that increasing the content of substituted monomer units in the (co)polymers enhanced solubility, photoluminescence, and sensitivity of moisture sensors. The copolymerization of aniline with its ortho-substituted derivatives was shown to be an efficient technique to modify PANI and improve the resulting materials.
Article
Chemistry, Multidisciplinary
Adeola Borode, Thato Tshephe, Peter Olubambi, Mohsen Sharifpur, Josua Meyer
Summary: The study investigated the influence of concentration and temperature on the electrical conductivity, viscosity, and thermal conductivity of GNP/Fe2O3 hybrid nanofluids. Results showed that nanofluids exhibited superior electrical conductivity, viscosity, and thermal conductivity compared to water. The electrical conductivity and thermal conductivity increased linearly with concentration at a constant temperature, while the viscosity of the nanofluid increased with the addition of hybrid nanoparticles and decreased with temperature. Additionally, increasing the addition of hybrid nanoparticles in the base fluid enhanced the thermal conductivity of the nanofluid, and the thermal conductivity ratio increased with the addition of nanoparticles. These findings highlight the potential of GNP/Fe2O3 hybrid nanofluids for improving heat transfer and energy efficiency in various industrial applications.
Article
Engineering, Electrical & Electronic
Umesh Somaji Waware, Mohd Rashid, A. M. S. Hamouda, Rohana Adnan, G. J. Summers
Summary: The uniform dielectric permittivity and frequency-dependent ac conductivity of hollow and porous semiconducting copolymer poly(aniline-co-m-hydroxyaniline) (PA-co-m-HA)s were studied using various techniques including electrochemical impedance spectroscopy, electronic spectroscopy, X-ray diffraction, and cyclic voltammetry. The copolymer exhibited globular and porous morphology, reduced crystallinity, and blue-shift in optical spectra.
JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS
(2021)
Article
Chemistry, Multidisciplinary
S. Sankar, Ajith George, M. T. Ramesan
Summary: Poly(aniline-co-indole)/copper alumina (PANI-co-PIN/Cu-Al2O3) nanocomposites with excellent AC conductivity, dielectric properties, and gas sensing capabilities were synthesized via in situ chemical oxidative polymerization. The successful encapsulation of Cu-Al2O3 nanoparticles in the copolymer was confirmed, and the nanocomposites showed improved electrical and gas sensing properties.
Article
Engineering, Chemical
Eyob Wondu, Jooheon Kim
Summary: This study focuses on the development of composite materials using thermoplastic polyurethane (TPU) and poly(lactic acid) (PLA) with fillers such as barium titanate (BaTiO3) and graphene. The results demonstrate a three-fold improvement in the dielectric constant and an improved tensile strength for the 40 wt.% BaTiO3 and graphene-TPU-PLA blends composites, as well as a doubled thermal conductivity compared to the neat TPU-PLA matrix.
POLYMER ENGINEERING AND SCIENCE
(2023)
Article
Metallurgy & Metallurgical Engineering
X. S. Yang, L. Zhou, K. Y. Liu, Z. Y. Liu, Q. Z. Wang, B. L. Xiao, Z. Y. Ma
Summary: The effective thermal conductivity of graphene nanoplatelet (GNP)/Al composites is influenced by factors such as the shape, aspect ratio, configuration, and volume fraction of GNPs. The study found that composites with elliptic GNPs have the highest thermal conductivity, increasing the aspect ratio of GNPs leads to an increase in thermal conductivity, and composites with layered GNPs have the highest thermal conductivity among different configurations. Additionally, the thermal conductivity is sensitive to the volume fraction of GNPs, reaching a high value when the volume fraction of layered GNPs is 1.54%.
ACTA METALLURGICA SINICA-ENGLISH LETTERS
(2022)
Article
Chemistry, Multidisciplinary
Heng Wang, Jie Lei, Taofen Wu, Dan Wu, Hai Liu, Yong Deng, Fuzhong Wu
Summary: This study prepared expanded vermiculite/poly(ethylene glycol)-boron nitride (E/PB-X) shape-stabilized composite phase-change materials and investigated the influence of boron nitride on their heat transfer and heat storage properties. The dispersed boron nitride fillers significantly enhanced the heat transfer of the materials, but decreased their latent heat. Additionally, the composite materials exhibited excellent chemical compatibility and thermal stability.
Article
Polymer Science
Jukka Niskanen, Mathieu N. Tousignant, Alexander J. Peltekoff, Benoit H. Lessard
Summary: 1,2,3-triazole based polyionic liquids have potential applications in organic electronics, with the ability to control their structure and charge to manipulate their properties. Substitution of inorganic counterions with organic counterions significantly improves the performance of metal-insulator-metal capacitors, enhancing their key performance metrics.
Article
Chemistry, Multidisciplinary
Riddhimoy Pathak, Lin Xie, Subarna Das, Tanmoy Ghosh, Animesh Bhui, Kapildeb Dolui, Dirtha Sanyal, Jiaqing He, Kanishka Biswas
Summary: In this study, high thermoelectric performance with a zT value of 2.3 was achieved in Ag vacant Ag1-xSbTe2 by optimizing the atomic disorder rooted in the thermodynamic phase diagram. The formation of AgSbTe2 and the introduction of Ag vacancies reduced the disorder in the semiconductor crystal, leading to increased electrical conductivity and power factor, as well as reduced lattice thermal conductivity due to the formation of nanoscale superstructures.
ENERGY & ENVIRONMENTAL SCIENCE
(2023)
Article
Chemistry, Physical
Shichen Deng, Jiale Yuan, Yuli Lin, Xiaoxiang Yu, Dengke Ma, Yuwen Huang, Rencai Ji, Guangzu Zhang, Nuo Yang
Summary: Phonon engineering investigates heat transport modulation at the atomic scale, and a new method involving electric field modulation in ferroelectric polymers has been proposed. This method can significantly enhance the thermal conductivities of poly(vinylidene fluoride) by improving lattice order, inter-chain interaction, phonon velocity, and reducing phonon scattering. This study offers a novel modulation strategy with rapid response time and without the need for fillers.
Article
Engineering, Environmental
Di Hu, Zhongbin Pan, Xiaoyan Tan, Fan Yang, Jie Ding, Xiang Zhang, Peng Li, Jinjun Liu, Jiwei Zhai, Hui Pan
Summary: This study successfully achieved high energy storage performance and efficiency with the innovative design and synthesis of 0.65BT-0.35(SBT-BMZ) ceramic, demonstrating superior thermal stability, frequency stability, and cycle stability, as well as excellent power density and ultrafast discharge time in charge and discharge experiments.
CHEMICAL ENGINEERING JOURNAL
(2021)
Article
Physics, Applied
Ahmad E. Islam, Nicholas P. Sepelak, Kyle J. Liddy, Rachel Kahler, Daniel M. Dryden, Jeremiah Williams, Hanwool Lee, Katie Gann, Andreas Popp, Kevin D. Leedy, Nolan S. Hendricks, Jeff. L. Brown, Eric R. Heller, Weisong Wang, Wenjuan Zhu, Michael O. Thompson, Kelson D. Chabak, Andrew J. Green
Summary: This study demonstrates the operation of field-effect transistors made of ultra-wide bandgap semiconductor beta-Ga2O3 at high temperatures. The effects of temperature on device performance were investigated. The results show a decrease in transconductance but an increase in drain current with increasing temperature. After high-temperature testing, the devices were able to recover their room-temperature electrical properties. The mechanism of gate leakage was also explored.
APPLIED PHYSICS LETTERS
(2022)
Article
Environmental Sciences
Sasan Zahmatkesh, Yousof Rezakhani, Abdoulmohammad Gholamzadeh Chofreh, Melika Karimian, Chongqing Wang, Iman Ghodrati, Mudassir Hasan, Mika Sillanpaa, Hitesh Panchal, Ramsha Khan
Summary: The COVID-19 outbreak led to the discovery of SARS-CoV-2 in sewage, raising concerns about its presence in wastewater treatment plants. This study aimed to determine the effectiveness of a mixed matrixed membrane (MMM) in removing SARS-CoV-2 and compare different secondary treatment processes. The study also explored the use of artificial neural networks (ANNs) as performance indicators for reducing SARS-CoV-2 in sewage treatment. The results showed that the MMM exhibited the most robust absorption performance, with the lowest log reduction values (LRVs) recorded in PC-Ag-NP and PC-HMO.
Article
Engineering, Electrical & Electronic
Nicholas C. Miller, Matt Grupen, Ahmad E. Islam, John D. Albrecht, Dave Frey, Richard Young, Miles Lindquist, Andrew J. Green, Dennis E. Walker Jr, Kelson D. Chabak
Summary: This article introduces a direct relationship between gate lag in drain current transient measurements of GaN HEMTs and traps in the transistor epitaxy barrier. Semiclassical numerical simulations are used to validate the results, and capacitance-voltage and conductance-voltage measurements provide additional insights. The study identifies specific traps at the AlGaN barrier/GaN cap interface as the main cause of gate lag in GaN HEMTs, emphasizing the importance of experimentally validated device simulations for trapping analysis and suggesting potential solutions for mitigating trapping effects in advanced GaN technologies.
IEEE TRANSACTIONS ON ELECTRON DEVICES
(2023)
Article
Engineering, Electrical & Electronic
Anwar Ulla Khan, Mohammad Ehtisham Khan, Mashhood Hasan, Waleed Alhazmi, Waleed Zakri
Summary: In this article, an analytical expression for the capacitance of coplanar interdigitated capacitive sensors with four 1-n-1 patterns has been obtained using conformal mapping techniques. The proposed model is universal and can be applied to various parameters such as number of layers, finger width, and gap between fingers. The effectiveness of the model has been confirmed through comparisons with finite element analysis and experimental results. Additionally, the proposed sensor structure has been used for noncontact measurement of water droplets on leaf canopies.
IEEE TRANSACTIONS ON INSTRUMENTATION AND MEASUREMENT
(2023)
Article
Chemistry, Multidisciplinary
Daniel Sim, Zhifeng Kuang, Gustavo Sant'Anna, Rachel M. Krabacher, Michael C. Brothers, Jorge L. Chavez, Jennifer A. Martin, Ahmad E. Islam, Benji Maruyama, Rajesh R. Naik, Nicholas M. Bedford, Steve S. Kim
Summary: This study presents a novel multimodal molecular toolset for designing, building, and probing suitable chemiresistor sensors using machine learning, molecular dynamics, and near-edge X-ray absorption fine structure spectroscopy. The results indicate that the conformation of peptides plays an important role in VOC sensing sensitivity.
ADVANCED MATERIALS INTERFACES
(2023)
Article
Biotechnology & Applied Microbiology
Thi Sinh Vo, Muhammad Mohsin Hossain, Jinwoo Lee, Jonghwan Suhr, Kyunghoon Kim
Summary: This study successfully explored the incorporation of chitosan and green filler materials (bamboo powders and coffee grounds) for low-cost adsorbents. The resulting composite foams exhibited excellent compressive properties and were effective in removing organic dyes from water, with superior recyclability compared to other adsorbents. These composite foams have the potential for applications in wastewater treatment due to their high performance, reusability, eco-friendly properties, and simple and low-cost fabrication processes.
ENVIRONMENTAL TECHNOLOGY & INNOVATION
(2023)
Article
Biochemistry & Molecular Biology
Gulam Rabbani, Mohammad Ehtisham Khan, Ejaz Ahmad, Mohsin Vahid Khan, Abrar Ahmad, Anwar Ulla Khan, Wahid Ali, Mazin A. Zamzami, Abdullateef H. Bashiri, Waleed Zakri
Summary: C-reactive protein (CRP) is a biomarker that can be used for the accurate diagnosis of cardiovascular risk, type-2 diabetes, metabolic syndrome, hypertension, and various types of cancers. This study successfully developed a highly sensitive and selective carbon nanotube field-effect transistor (CNT-FET) immunosensor for detecting CRP, with a wide dynamic range, rapid response time, and low variation. The use of this immunosensor can provide a low-cost and rapid clinical detection technology for the early diagnosis of coronary heart disease (CHD) and replace traditional expensive laboratory-based procedures.
BIOELECTROCHEMISTRY
(2023)
Article
Physics, Multidisciplinary
Mohd Imran, Shahzad Ahmed, Enaam A. Al-Harthi, Mohammad Ehtisham Khan, Md Mottahir Alam, Faouzi Haouala, Anis Ahmad Chaudhary, Ali Asghar
Summary: This study investigated the electrochemical detection of nitrazepam using a graphitic carbon nitride (g-C3N4) modified electrode. The nitrogen-rich carbon material, g-C3N4, was easily synthesized using melamine as a precursor. The modified platinum electrode showed effective detection of nitrazepam, as confirmed by cyclic voltammetry and electrochemical impedance spectroscopy. Different concentrations of nitrazepam were analyzed using CV and DPV, with a detection limit of 0.02 μM and linear dynamic range. A repeatability experiment verified the stability of the proposed electrode. This study confirms the potential use of g-C3N4 as an effective and stable electrode material for pharmaceutical and healthcare detection applications.
Article
Chemistry, Physical
Nebras Sobahi, Mohd Imran, Mohammad Ehtisham Khan, Akbar Mohammad, Md. Mottahir Alam, Taeho Yoon, Ibrahim M. Mehedi, Mohammad A. Hussain, Mohammed J. Abdulaal, Ahmad A. Jiman
Summary: We synthesized Fe3O4/graphene nanocomposite for peroxide sensor with high selectivity and sensitivity. The nanocomposites were produced through a modified co-precipitation method and characterized using various techniques. The as-fabricated flexible electrode showed excellent electrocatalytic activity and exhibited a good linear range, high sensitivity, and low detection limit for H2O2 detection. The biosensor is cost-effective, stable, and highly reproducible.
Review
Chemistry, Multidisciplinary
Ambreen Shoaib, Ali Darraj, Mohammad Ehtisham Khan, Lubna Azmi, Abdulaziz Alalwan, Osamah Alamri, Mohammad Tabish, Anwar Ulla Khan
Summary: Diabetes mellitus is a serious condition that can lead to various health problems. Early detection is crucial, and biosensors have proven to be effective in diagnosing and monitoring diabetes. The incorporation of nanotechnology has further enhanced the performance and sensitivity of these biosensors, allowing for disease detection and therapy tracking. This article focuses on the applications of biosensors in diabetes management, including glucose sensors and printed biosensors. It also discusses the advances and challenges of nanotechnology-based biosensors for medical use.
Article
Plant Sciences
Umar Farooq, Ahmad Kaleem Qureshi, Hadia Noor, Muhammad Farhan, Mohammad Ehtisham Khan, Osama A. Hamed, Abdullateef H. Bashiri, Waleed Zakri
Summary: Silver nanoparticles were synthesized using an extract of the Ammi visnaga plant, which showed antibiofilm, photocatalytic, and anticancer activities. The morphology and structure of the nanoparticles were characterized, and their effectiveness against biofilms, bacteria, and cancer cells was demonstrated.
Article
Engineering, Multidisciplinary
Osama A. Hamed, Mohammad Ehtisham Khan, Anwar Ulla Khan, Gulam Rabbani, Mohammad S. Alomar, Abdullateef H. Bashiri, Waleed Zakri
Summary: In this study, brushite-coated porous titanium was developed using an electrochemical process to enhance its performance as an implant material and facilitate bone tissue growth. The effects of different sterilization techniques on the crystal phase of Ca3(PO4)2 were also investigated. In-vitro tests were conducted to assess the biocompatibility of the coating with human mesenchymal stem cells, demonstrating that the coating influenced cell proliferation and growth to some extent, highlighting the need for further research.
RESULTS IN ENGINEERING
(2023)
Review
Energy & Fuels
Susmi Anna Thomas, Mohan Reddy Pallavolu, Mohammad Ehtisham Khan, Jayesh Cherusseri
Summary: Two-dimensional graphitic carbon nitride (g-C3N4) is similar to graphene and has attracted great interest in electrochemical energy storage. It has unique features such as nitrogen-rich environment, abundant resources, good electronic conductivity, excellent physicochemical stability, fascinating electrochemical stability, and environmental friendliness, making it a promising electrode candidate for high-performance rechargeable batteries. The 2D g-C3N4 electrodes exhibit excellent electrochemical performance in terms of high capacity, high energy density, and long cycle life, which are beneficial for metal-ion batteries. In addition, the large surface area, porous architecture, and thin-layer structural features of these materials are favorable for high performance in metal air batteries.
JOURNAL OF ENERGY STORAGE
(2023)
Article
Green & Sustainable Science & Technology
Umar Farooq, Ahmad Kaleem Qureshi, Muhammad Farhan, Ume Romman, Mohammad Ehtisham Khan, Wahid Ali, Abdullateef H. Bashiri, Waleed Zakri
Summary: Oxystelma esculentum plant is used to synthesize palladium nanoparticles for their effective catalytic activity. The nanoparticles were characterized using various analytical tools and showed successful formation of palladium nanoparticles. The catalytic activity of the nanoparticles was demonstrated against the toxic organic dye methylene blue, and the degradation products were identified using electrospray ionization coupled mass spectrometry. The catalyst showed stability and reusability, making it suitable for the degradation of other emerging pollutants.
MATERIALS TODAY SUSTAINABILITY
(2023)
Article
Engineering, Electrical & Electronic
Nicholas C. Miller, Alexis Brown, Michael Elliott, Ryan Gilbert, Devin T. Davis, Ahmad E. Islam, Dennis Walker Jr, Gary Hughes, Kyle Liddy, Kelson D. Chabak
Summary: This paper presents a temperature-dependent ASM-HEMT for modeling GaN HEMTs at elevated temperatures. The model was modified to accurately capture the DC and RF measurements at different chuck temperatures, and its accuracy was validated through various tests. The extrapolated performance of the GaN HEMT at twice the operating temperature was also predicted using this model.
IEEE JOURNAL OF THE ELECTRON DEVICES SOCIETY
(2023)
