Article
Engineering, Chemical
Zixuan Ma, Minghui Tan, Fenghai Cao, Yuhao Yang, Nana Gong, Yingquan Wu, Junfeng Zhang, Guohui Yang, Yisheng Tan
Summary: In this study, the synergistic effect of ZnO and ZnCr2O4 was investigated by physical mixing, and it was found that the xZZC catalyst produced more adsorbed species and achieved enhanced pulling effect on CO conversion.
Article
Engineering, Environmental
Abbas Babaei, Mahmoud Ghazavi, Navid Ganjian
Summary: This study investigates the effects of Nano-ZnO (NZ) on the mechanical properties of cemented clayey sand and the relationship between ultrasonic pulse velocity (UPV) and unconfined compressive strength (UCS). The results demonstrate that using NZ as an additive enhances the mechanical properties of cemented clayey sand, and FESEM observations show that NZ reduces the occurrence of micro-cracks.
BULLETIN OF ENGINEERING GEOLOGY AND THE ENVIRONMENT
(2022)
Article
Thermodynamics
T. Salahuddin, Abdul Mosan Bashir, Mair Khan, We-Fing Xia
Summary: This study evaluates the effect of different shaped nano-particles on the thermal behavior and flow performance of nanofluid flow through inflexible and sinusoidal walls in the existence of heat generation effect. Mathematical models are used to compare the performance of platelet, blade, cylinder, and brick shaped nano-particles in different flow conditions with methanol as the base fluid. The research converts nonlinear partial differential equations into ordinary differential equations to analyze the friction forces, pressure gradient, pressure rise, velocity and temperature profiles for the different shapes of nano-particles.
CASE STUDIES IN THERMAL ENGINEERING
(2021)
Article
Construction & Building Technology
Maria Kmeid, Geraldine Casaux-Ginestet, Gilles Escadeillas, Julie Armengaud, Philippe Robit
Summary: This study aims to investigate the phenomenon of shadowing pathologies in diaphragm wall technique through experimental research. By conducting experiments using a laboratory prototype, shadowing pathologies were successfully reproduced, helping identify potential causes and providing recommendations.
CONSTRUCTION AND BUILDING MATERIALS
(2023)
Article
Chemistry, Physical
D. K. Chudasama, V. G. Shrimali, Ajay Vaishnani, C. M. Panchasara, Nisarg Raval, Urvashi Jambukiya, A. Amouri, Davit Dhruv, A. D. Joshi, P. S. Solanki, N. A. Shah, D. D. Pandya
Summary: A new class of materials called matrix-nano composites has the ability to meet the needs of modern advanced applications and technology. In this study, a BiFeO3:ZnO composite was prepared by adding micron-sized ZnO to BiFeO3 nanoparticles prepared using a low-cost sol-gel method. The structural, morphological, and optical properties of the materials were characterized, and the dielectric properties were investigated. The results showed improved charge separation efficiency and wider band gaps with increasing BFO content.
JOURNAL OF ALLOYS AND COMPOUNDS
(2023)
Article
Chemistry, Physical
Yongyi Xu, Jingyi Zhang, Fubang Liang, Meng Yin, Meifeng He
Summary: Radio frequency magnetron sputtering was used to deposit nano-silver coating on the surface of pure titanium with micro- and nano- layered structure. The results showed that silver nanoparticles could be successfully deposited on the surface and form micro-nano holes. The wettability and surface roughness of the coating were related to the magnetron sputtering time, and the release rate of silver ions showed time-dependent characteristics.
SURFACES AND INTERFACES
(2023)
Article
Materials Science, Ceramics
Khushnuda Nur, Tarini Prasad Mishra, Joao Gustavo Pereira da Silva, Jesus Gonzalez-Julian, Martin Bram, Olivier Guillon
Summary: This study optimized cold sintering parameters for ZnO to achieve high density and small grain size. The research also revealed the impact of powder agglomerates and inter particle friction on densification behavior, as well as the influence of external atmosphere during the process.
JOURNAL OF THE EUROPEAN CERAMIC SOCIETY
(2021)
Article
Environmental Sciences
Purushothaman Maheswari, Doraiswamy Raju Mohan, Adhikesavan Hari Krishnan, Ramachandran Sivaramakrishnan, Arivalagan Pugazhendhi
Summary: Industrial wastewater containing harmful substances has a significant impact on water resources and water quality. Membrane technology for wastewater treatment can effectively address these issues. In this study, a nano-ZnO incorporated membrane was used to remove harmful metal particles, and it showed superior performance compared to the neat membrane.
Article
Chemistry, Physical
M. Ounacer, B. Rabi, A. Essoumhi, M. Sajieddine, B. F. O. Costa, M. Emo, A. Razouk, M. Sahlaoui
Summary: The report investigates the structural and magnetic properties of Al3+ substituted cobalt ferrite nanoparticles. It demonstrates that increasing Al content significantly influences the lattice parameters and magnetic properties, leading to a decrease in grain size.
JOURNAL OF ALLOYS AND COMPOUNDS
(2021)
Article
Materials Science, Multidisciplinary
Wudong Liu, Jie Zhang, Xiangbiao Yin, Xinyi He, Xinpeng Wang, Yuezhou Wei
Summary: LEuH-Cl, synthesized through a hydrothermal reaction, exhibits excellent anion exchange abilities and photoluminescence properties, making it suitable for the detection of MnO4- and Cr2O72- in aqueous solutions.
MATERIALS CHEMISTRY AND PHYSICS
(2021)
Article
Chemistry, Analytical
Suchismita Subadini, Ram Sankar Panigrahy, Nishesh Kumar Gupta, Krishnendu Bera, Harekrushna Sahoo
Summary: In this study, the interaction between chicken egg white lysozyme (Lyz) and two hexavalent chromate ions, chromate and dichromate, was investigated. The results from spectroscopic techniques and molecular docking revealed that the addition of chromate/dichromate causes strong quenching of intrinsic fluorescence in Lyz, and this quenching is attributed to both static and dynamic mechanisms. The different binding and thermodynamic parameters were calculated from the intrinsic fluorescence of Lyz at different temperatures, and the conformational changes and thermodynamic parameters obtained were supported by the molecular docking results.
Article
Materials Science, Ceramics
Hailiang Wang, Jianqi Qi, Hao Guo, Ruichong Chen, Mao Yang, Yichao Gong, Zhangyi Huang, Qiwu Shi, Wen Liu, Hailong Wang, Tiecheng Lu
Summary: Characterization and analysis of nano- and coarse-grained Li2TiO3 tritium breeder ceramic plates after radiation showed that nano-grained Li2TiO3 exhibited more stable crystal structure, smoother surface, and lower defect concentration compared to coarse-grained Li2TiO3.
CERAMICS INTERNATIONAL
(2021)
Article
Chemistry, Physical
Arunakumari Nulu, Venugopal Nulu, Keun Yong Sohn
Summary: The study finds that transition metal-doped silicon anodes exhibit improved electrochemical performance, including enhanced capacity retention and rate capability. Metal dopants enhance silicon's conductivity, mitigate volume expansion, and provide better Li+ diffusion properties.
JOURNAL OF ALLOYS AND COMPOUNDS
(2022)
Article
Thermodynamics
Noor Muhammad, Naveed Ahmed
Summary: This paper presents the laminar time-dependent fluid flow of an engine oil (ZnO-SAE50 nano-lubricant) through a rectangular channel with permeable walls. The governing partial differential equations are simplified using similarity transformations and conservation of mass, and then solved using the Subdomain Method and another numerical scheme. The results show the variations of flow and temperature profiles under different physical parameters, and are supported by graphs and tables. The paper concludes with thorough discussions and concluding results.
INTERNATIONAL COMMUNICATIONS IN HEAT AND MASS TRANSFER
(2022)
Article
Engineering, Multidisciplinary
Yixiao Wang, Ang Zhang, Huijuan Wang
Summary: This paper takes the reinforcement embedded in concrete as the research object. The corrosion rate of the reinforcement in concrete is measured. The chloride ion concentration on the surface of reinforced concrete was measured using a nano-Ag/AgCl electrode. The corrosion mechanism of reinforced concrete specimens is studied based on the chloride diffusion theory and corrosion electrochemistry theory. The pitting of concrete reinforcement is positively related to the concentration of chloride ion.
ALEXANDRIA ENGINEERING JOURNAL
(2023)
Article
Materials Science, Multidisciplinary
Mozhikunnam Sreekrishnan Arjunan, Nishant Saxena, Anirban Mondal, Tejendra Dixit, Kumaran Nair Valsala Devi Adarsh, Anbarasu Manivannan
Summary: By irradiating nanosecond laser pulses on thin In(3)SbTe(2)films, eight uniform optical states with high stability and low noise were demonstrated, showing potential for reliable phase change photonic memory devices.
PHYSICA STATUS SOLIDI-RAPID RESEARCH LETTERS
(2021)
Article
Materials Science, Multidisciplinary
T. R. Rajalekshmi, Tejendra Dixit, M. S. Ramachandra Rao, K. Sethupathi
Summary: Lasing is observed in microcrystals of the Ga:LaCrO3 perovskite system due to pair emission of Cr3+ ions. The ceramic material shows appreciable lasing profile under 488 nm laser pumping. Enhanced lasing characteristics are seen in low-temperature ranges, with the short lifetime attributed to the high concentration of Cr3+ ions enhancing pair emission.
PHYSICA STATUS SOLIDI-RAPID RESEARCH LETTERS
(2021)
Article
Nanoscience & Nanotechnology
T. R. Rajalekshmi, Vikash Mishra, Tejendra Dixit, Muralidhar Miryala, M. S. Ramachandra Rao, K. Sethupathi
Summary: This study reports the realization of near-white light emission and selective tuning of near-infrared luminescence in Ga-substituted lanthanum chromite perovskite using electron-beam excitation. The near-white light emission is a combination of spin allowed transitions and spin forbidden transitions from the Cr3+ ion, while the near-infrared emission is associated with the concentration of Ga3+ ions.
SCRIPTA MATERIALIA
(2022)
Review
Physics, Applied
Arige Sumanth, Kolla Lakshmi Ganapathi, M. S. Ramachandra Rao, Tejendra Dixit
Summary: Optoelectronic devices are increasingly important in modern applications. Persistent photoconductivity (PPC) is a novel optoelectronic phenomenon that has been explored for various applications. This article reviews the origins, control mechanisms, and recent advances of PPC in different materials, and discusses its potential for next-generation optoelectronic applications in industry 4.0.
JOURNAL OF PHYSICS D-APPLIED PHYSICS
(2022)
Article
Physics, Applied
Ankit Arora, Kolla Lakshmi Ganapathi, Tejendra Dixit, Muralidhar Miryala, Murakami Masato, M. S. Ramachandra Rao, Ananth Krishnan
Summary: In this study, we investigated the direct current (dc) current-voltage characteristics of few-layer muscovite mica (MuM) flakes transferred onto a SiO2/Si substrate. We observed an increase in in-plane electrical conductivity with decreasing thickness of the MuM flakes, contrary to conventional two-dimensional systems. Through analysis of the I-V characteristics and conduction mechanism, we found that the Fermi level moved towards the conduction band with decreasing thickness, leading to an increase in conductivity in thinner flakes possibly due to surface doping.
PHYSICAL REVIEW APPLIED
(2022)
Article
Engineering, Electrical & Electronic
Ashish Kumar, Meenu Devi, Mahesh Kumar, Ashish Shrivastava, Rishi Sharma, Tejendra Dixit, Vipul Singh, Khurram Shehzad, Yang Xu, Kulwant Singh, Huan Hu
Summary: This article reviews the contemporary developments in the utilization of silicon nanostructures and nanocomposites for antibacterial surfaces and theranostic agents. The realization of nature-inspired antibacterial surfaces, photoresponsive smart antibacterial surfaces, and selective functionality of silicon nanostructures has been discussed. In addition, the capability of photoresponsive silicon nanocomposite systems for in-situ non-invasive process monitoring has been addressed.
SENSORS AND ACTUATORS A-PHYSICAL
(2022)
Article
Materials Science, Multidisciplinary
Sumanth Arige, Vikash Mishra, Muralidhar Miryala, M. S. Ramachandra Rao, Tejendra Dixit
Summary: This study investigates the sub-bandgap emission properties of ultra-wide bandgap CuO thin films and finds that CuO exhibits near-infrared (NIR) emission under sub-bandgap excitation, which can be enhanced by incorporating Au nanoparticles. Temperature-dependent photoluminescence measurements show enhanced Purcell effect in Au and CuO. DFT studies are performed to understand the effect of defects on the emission and absorption properties of CuO. Electron paramagnetic resonance measurements and current-voltage characteristics are used to study the effect of Au on other optical and electrical features.
Article
Engineering, Electrical & Electronic
Bellarmine Francis, Reethu Sebastian, Tejendra Dixit, K. Lakshmi Ganapathi, M. S. Ramachandra Rao
Summary: We have fabricated a high responsivity ultraviolet (UV) photodetector based on ZnO/p-GaN. ZnO nanorods were grown using hydrothermal technique with two different precursors. The nitrate precursor resulted in ZnO nanorods with less defect emission and lower dark current levels compared to the chloride-based precursor. The as-fabricated device exhibited high photo-responsivity and photo-detectivity values at low excitation intensity, suggesting its potential for high-performance next generation UV photodetectors.
SEMICONDUCTOR SCIENCE AND TECHNOLOGY
(2023)
Article
Engineering, Electrical & Electronic
Jitesh Agrawal, Tejswini Kishor Lahane, Tejendra Dixit, Vipul Singh
Summary: A self-biased hybrid UV photodiode with Pt nanoparticles at ZnO/P3HT interface has been developed, improving barrier potential and various device parameters. The device showed high photosensitivity, photoresponsivity, and specific detectivity in the self-biased mode, with a shortened response time. This device has the potential to meet the demands of modern technologies.
IEEE ELECTRON DEVICE LETTERS
(2023)
Article
Engineering, Electrical & Electronic
Tejendra Dixit, Swanand V. Solanke, Kolla Lakshmi Ganapathi, Vipul Singh
Summary: In this study, we fabricated a UV-C photodetector using wide bandgap CuO nanostructures on a flexible substrate. The as-fabricated device showed a photo-sensitivity of approximately 15, a photo-responsivity of approximately 485 mA/W, and a photo-detectivity of approximately 1.4 x 10^11 Jones with 220 nm excitation. The external quantum efficiency (EQE) and linear-dynamic range (LDR) of the device were calculated to be 74% and 56 dB, respectively, at 220 nm excitation.
IEEE PHOTONICS TECHNOLOGY LETTERS
(2023)
Article
Physics, Applied
T. R. Rajalekshmi, Vikash Mishra, Tejendra Dixit, Pankaj R. Sagdeo, M. S. Ramachandra Rao, K. Sethupathi
Summary: In this study, the origin of three energy gaps in lanthanum chromium oxide is analyzed using diffuse reflectance spectroscopy. The results show charge-transfer and d-d transitions as the sources of the gaps. The use of Tanabe-Sugano diagram and absorption spectrum helps in understanding the spin allowed and parity forbidden transitions. The findings have significant implications in laser applications and the development of optoelectronic devices.
JOURNAL OF APPLIED PHYSICS
(2023)
Article
Materials Science, Multidisciplinary
Pritha Dey, Tejendra Dixit, Vikash Mishra, Anubhab Sahoo, Cheriyanath Vijayan, Sivarama Krishnan
Summary: In this study, the formation and decay of an unexpected electron-hole quantum liquid phase in multi-layer MoS2 nanoparticles at room temperature is investigated using femtosecond broadband transient absorption spectroscopy. The research reveals that the initial electron-hole plasma condenses into a quantum electron-hole liquid phase, which lasts for about 10 picoseconds, before decaying through phonons. A physical model employing nonlinear rate equations is used to extract the contributions of each phase to bandgap renormalization. This work not only observes the electron-hole liquid-like state at room temperature but also reveals the ultrafast dynamics of photo-excited low-dimensional systems.
ADVANCED OPTICAL MATERIALS
(2023)
Article
Engineering, Electrical & Electronic
M. Julie Therese, Vikash Mishra, M. S. Ramachandra Rao, Tejendra Dixit
Summary: In this study, the resistive switching mechanism in ZnO and CuO based on native point defects under various growth conditions has been investigated. The results show that the stability and formation energy of different defect types vary under different growth environments, playing an important role in memristive behavior. Additionally, the defect concentration also has a significant impact on the transition from analog to digital switching in memristive behavior.
IEEE TRANSACTIONS ON ELECTRON DEVICES
(2023)
Article
Nanoscience & Nanotechnology
Arige Sumanth, Vikash Mishra, Vipul Singh, Tejendra Dixit
Summary: A simple solution-based technique using all-oxide semiconductor-based heterojunction is reported for efficient white-light emission. Vertically oriented CuO nanorods with deposited ZnO thin films on top showed excellent white-light emission. The inclusion of an Au layer between ZnO/CuO heterojunction significantly improved white-light emission, resulting in a white light photoluminescence with chromaticity coordinates of (0.32, 0.34).
SCRIPTA MATERIALIA
(2023)
Article
Engineering, Electrical & Electronic
Arige Sumanth, Vikash Mishra, Poonam Pandey, M. S. Ramachandra Rao, Tejendra Dixit
Summary: Copper(II) oxide (CuO) exhibits fascinating optoelectronic and spintronic features, making it attractive for NIR and broadband detection as well as potential applications in spintronics. Ab-initio calculations were conducted to understand CuO band structures, defect dynamics, charge distribution, and absorption properties. Various defects, including vacancies and di-vacancies, significantly contribute to the photovoltaic features and defect-assisted CuO exhibits a significant magnetic moment, making it suitable for spintronics.
IEEE TRANSACTIONS ON NANOTECHNOLOGY
(2022)
