Article
Thermodynamics
Ammara Bhatti, M. Mustafa, Talat Rafiq
Summary: The present study investigates the buoyancy assisted or opposed Falkner-Skan nanofluid flow over a heated wedge using a single-phase model and partial slip assumption. The numerical analysis of velocity field and temperature shows that the nanofluid assumption is crucial for enhancing thermal conductivity. Additionally, the study using the Buongiorno model in a special case helps to understand the effects of changing Brownian diffusion and thermophoresis parameters on temperature distribution.
INTERNATIONAL COMMUNICATIONS IN HEAT AND MASS TRANSFER
(2021)
Article
Thermodynamics
Yingchun Zhang, Weihong Li, Yong Li, Gongnan Xie
Summary: This study investigates the potential applications of nanofluids under magnetic fields in microchannel cooling and thermal absorption. A preconditioned lattice Boltzmann method (PLBM) is developed to study the thermo-hydraulic characteristics of Al2O3-water nanofluid in a microchannel with temperature-dependent physical properties. The effects of external magnetic field, buoyancy force, and volume fraction of nanoparticles are discussed, and entropy generation is analyzed. The results show that applying a magnetic field increases the average shear stress and Nusselt number, and the entropy generation caused by magnetic field irreversibility is higher than that caused by heat transfer irreversibility.
JOURNAL OF THERMAL ANALYSIS AND CALORIMETRY
(2022)
Article
Thermodynamics
Xianqin Zhang, Dezhi Yang, M. Israr Ur Rehman, A. A. Mousa, Aamir Hamid
Summary: This research focuses on the rheological characteristics of Williamson nanofluid bioconvection flow past a stretching cylinder embedded in Darcy-Forchheimer medium. The study uses thermal radiation properties to modify the energy equation and incorporates the concept of microorganisms to stabilize the nanoparticle suspensions. Numerical methods are employed to analyze the effects of various parameters on velocity profile, thermal profile, nanoparticle concentration, and microbe distribution. The results show that the Darcy-Forchheimer parameter and the magnetic parameter have significant influences on fluid velocity and momentum barrier layer thickness, while changing the Peclet number affects the spread of microorganisms.
CASE STUDIES IN THERMAL ENGINEERING
(2022)
Article
Mathematics, Applied
Ying-Qing Song, Sami Ullah Khan, M. Ijaz Khan, Muhammad Awais, Aamar Abbasi, Qiu-Hong Shi
Summary: This article focuses on the study of Williamson nanofluid containing microorganisms over three-dimensional surface under the influence of magnetic field through bidirectional nonlinearly stretched surface. The obtained fundamental ordinary differential equations are solved numerically and presented in form of graphs and tables for comparison. The study has practical applications in transportation and industrial processes, exploring the cumulative effect of different physical features on the flow of Williamson fluid.
APPLIED MATHEMATICS AND COMPUTATION
(2021)
Article
Mathematics
Mounirah Areshi, Haifaa Alrihieli, Elham Alali, Ahmed M. Megahed
Summary: The heat and mass transfer in magnetized non-Newtonian Williamson nanofluid flow saturated by gyrotactic microorganisms due to a stretched sheet is investigated. The study reveals that the skin-friction coefficient increases with the increase of magnetic field and thermal conductivity parameters, while the opposite trend is observed for the slip velocity and viscosity parameters.
Article
Multidisciplinary Sciences
Yu-Pei Lv, Hina Gul, Muhammad Ramzan, Jae Dong Chung, Muhammad Bilal
Summary: A new type of non-Newtonian fluid named Reiner-Rivlin nanofluid flow over a rough rotating disk with Cattaneo-Christov (C-C) heat flux is studied in a permeable media, with the stability of the nanoparticles augmented by adding gyrotactic microorganisms. The concept is improved by considering factors like Arrhenius activation energy, chemical reaction, slip, and convective conditions at the surface boundary. The entropy generation is evaluated using the second law of thermodynamics, and the results are compared with a previously published paper to validate the accuracy of the model.
SCIENTIFIC REPORTS
(2021)
Article
Thermodynamics
A. H. Tedjani
Summary: The research investigates the effects of temperature and concentration on the MHD Casson-Williamson nanofluid flow through a porous sheet. The study incorporates a novel approach, considering factors such as an inclined magnetic field and the temperature-dependent viscosity of nanofluids. The findings have important implications for engineering applications.
CASE STUDIES IN THERMAL ENGINEERING
(2023)
Article
Physics, Applied
Ramesh Kune, S. Hari Singh Naik, Kottakkaran Sooppy Nisar
Summary: This paper investigates the influence of velocity slip and Newtonian heating on Williamson Nanofluid flow over a stretching sheet. The fluid flow equations are transformed into a system of coupled ordinary differential equations and solved numerically using the Keller-box approach. The results show that increasing the Williamson parameter leads to a decrease in fluid velocity due to the increase in viscosity velocity. The velocity slip parameter reduces the Nanofluid velocity while increasing shear stress, while the Newtonian heating parameter has rising functions for velocity and dimensionless temperature.
INTERNATIONAL JOURNAL OF MODERN PHYSICS B
(2023)
Article
Energy & Fuels
Aiguo Zhu, Haider Ali, Muhammad Ishaq, Muhammad Sheraz Junaid, Jawad Raza, Muhammad Amjad
Summary: The current study investigates the behavior of non-Newtonian unsteady Williamson fluid on a stretching/shrinking surface with thermophoresis and Brownian effects. Numerical analysis is used to analyze the effects of various parameters on fluid velocity and thermal boundary layer thickness, showing that increasing the stretching parameter decreases fluid velocity and increases thermal boundary layer thickness.
Article
Thermodynamics
Prabhugouda M. Patil, Bharath Goudar
Summary: This study examines the unsteady combined convective flow of Williamson ternary hybrid nanofluid over a rotating sphere with multiple slips and entropy generation. The inclusion of carbon nanotubes and titanium dioxide nanoparticles in the base fluid results in higher heat transfer rates compared to single and two-components nanofluids at the same volume fraction. The SWCNT-MWCNT Williamson hybrid nanofluid shows an improvement of approximately 8% in energy transport rate compared to SWCNT Williamson nanofluid. The Williamson ternary hybrid nanofluid demonstrates a 34% enhancement in heat transfer strength compared to the Williamson fluid.
NUMERICAL HEAT TRANSFER PART A-APPLICATIONS
(2023)
Article
Engineering, Multidisciplinary
N. S. Yousef, Ahmed M. Megahed, Nourhan Ghoneim, M. Elsafi, Eman Fares
Summary: In this study, the heat and mass transport properties of a non-Newtonian Casson-Williamson nanofluid flow were investigated. The effects of viscous dissipation and velocity slip boundary condition on the mechanism of heat and mass transfer were explored. The study also analyzed the chemical repercussions of nanofluid particle movement on nanofluid concentration. Numerical analysis showed the impact of various factors on velocity, temperature, and concentration.
ALEXANDRIA ENGINEERING JOURNAL
(2022)
Article
Thermodynamics
R. Prattipati, B. V. S. S. S. Prasad
Summary: In this study, slip ratio in flow boiling experiments was estimated using numerical simulations based on a wall boiling model. The computationally obtained void fraction values were verified against experimental data, showing variations in slip ratio along the length of the tube. A new correlation was proposed to relate slip ratio with thermodynamic quality, considering the effects of length and operating conditions.
INTERNATIONAL JOURNAL OF THERMAL SCIENCES
(2021)
Article
Chemistry, Physical
Muhammad Mumtaz, Saeed Islam, Hakeem Ullah, Zahir Shah
Summary: This research article examines the flow of modified hybrid nanofluid on a curved stretching sheet under the influence of electricity and magnetism. The study evaluates the heat and mass transfer properties of the ternary nanofluid and concludes that increasing the curvature enhances the velocity profile while the impact of the magnetic factor is opposite. The research also highlights the importance of nanofluids in nanotechnology and their potential for enhancing heat transfer.
JOURNAL OF MOLECULAR LIQUIDS
(2023)
Article
Chemistry, Physical
K. Mahmud, R. Mehmood, S. Rana, A. Al-Zubaidi
Summary: In this research, the effects of Hall and ion-slip on oblique stagnation point flow of magneto hydrodynamics Casson nanofluid with Newtonian heating and zero heat and mass on an elastic surface are discussed. The governing equations are transformed into a system of non-linear ODEs using similarity transformation and solved numerically using the Runge-Kutta Fehlberg method. The results show the influence of physical constraints on the velocity, temperature, and nanoparticles' concentration. Skin friction quantities, heat and mass flux are measured numerically. The study reveals the dominant influence of the magnetic field parameter on temperature and concentration of nanoparticles far away from the surface.
JOURNAL OF MOLECULAR LIQUIDS
(2022)
Article
Chemistry, Physical
M. Z. Kiyani, T. Hayat, I. Ahmad, M. Waqas, A. Alsaedi
Summary: This study discusses the bidirectional flows of Williamson nanomaterial in porous space, utilizing a nonlinear model and the optimal homotopy analysis method to compute the results. It is found that increasing the Williamson parameter and porosity parameter slows down bidirectional velocities, while temperature is related to thermophoresis parameter and heat sources. Skin friction coefficients and Nusselt number increase with porosity parameter and Prandtl number, while the Sherwood number decreases due to Brownian motion.
SURFACES AND INTERFACES
(2021)
Article
Thermodynamics
Juan Zhang, Fuzhang Wang, Sohail Nadeem, Mei Sun
Summary: The proposed direct radial basis function collocation method is effective for solving advection-diffusion equations with both time and space variables. It performs well for both linear and nonlinear cases, as shown in numerical results with different Peclet numbers.
INTERNATIONAL COMMUNICATIONS IN HEAT AND MASS TRANSFER
(2022)
Article
Thermodynamics
Syed Saqib Shah, Hakan F. Oztop, Rizwan Ul-Haq, Nidal Abu-Hamdeh
Summary: This paper analyzes the buoyancy flow, mass and heat transfer in a coaxial duct under the Soret and Dufour effect. The combined effects of various parameters on natural convection are studied using a numerical approach. The results show that the Lewis number has a significant impact on mass transfer, while the buoyancy ratio parameter decreases the average rate of heat flow and increases mass transfer.
INTERNATIONAL JOURNAL OF NUMERICAL METHODS FOR HEAT & FLUID FLOW
(2023)
Article
Engineering, Multidisciplinary
Bushra Ishtiaq, Ahmed. M. Zidan, Sohail Nadeem, Mohammed Kbiri Alaoui
Summary: This article presents a comparative study of magnetohydrodynamics stagnant point flow in hybrid nanofluid using the extended versions of the Yamada-Ota model and Xue model. The study considers a time-dependent and thermally radiative two-dimensional flow with a stretchable/shrinking permeable sheet. The hybrid nanofluid is formulated by suspending Aluminum Oxide Al2O3 and Copper Cu nanoparticles in water. The nonlinear dimensionless system of ordinary differential equations is solved numerically using the bvp4c methodology. The study finds that the heat transfer rate is higher in the Yamada-Ota model compared to the Xue model, and increasing the stretching parameter enhances the velocity field but deteriorates the temperature distribution.
AIN SHAMS ENGINEERING JOURNAL
(2023)
Article
Mathematics, Applied
Nadeem Abbas, Sohail Nadeem, Wasfi Shatanawi
Summary: This study presents a numerical analysis of MHD 3D second grade fluid over slendering stretching sheet, with considerations of heat generation and thermal radiation impacts. The problem is mathematically stated as PDEs and transformed to nonlinear ODEs using appropriate similarity variables. The solutions are computed using MATLAB bvp4c function and the impacts of involving parameters on velocity and temperature are analyzed. The results show the effects of various parameters on skin friction and Nusselt number.
ZAMM-ZEITSCHRIFT FUR ANGEWANDTE MATHEMATIK UND MECHANIK
(2023)
Article
Mathematics, Applied
Sohail Nadeem, Salman Akhtar, Nevzat Akkurt, Anber Saleem, Shahah Almutairi, Hassan Ali Ghazwani
Summary: This study mathematically investigates the heat and mass transfer during the peristaltic flow of a non-Newtonian Jeffrey fluid inside an elliptic cross-section duct. The analysis considers constant heat absorption and provides a descriptive assessment of the heat and mass transfer. Exact solutions are obtained using a polynomial solution technique for the dimensionless partial differential equations in the problem. A purposeful graphical assessment is provided for the final mathematical results. Velocity and temperature profiles reach their highest values in the core region of the duct and gradually decrease towards the duct boundaries.
ZAMM-ZEITSCHRIFT FUR ANGEWANDTE MATHEMATIK UND MECHANIK
(2023)
Article
Green & Sustainable Science & Technology
Wajad Ulfat, Ayesha Mohyuddin, Muhammad Amjad, Tonni Agustiono Kurniawan, Beenish Mujahid, Sohail Nadeem, Mohsin Javed, Adnan Amjad, Abdul Qayyum Ashraf, Mohd Hafiz Dzarfan Othman, Sadaful Hassan, Muhammad Arif
Summary: This study developed a thermal insulation composite material using buffing dust-laden tanning waste mixed with polystyrene and a blowing agent, aiming to promote resource recovery and a circular economy. The composite material exhibited good thermal conductivity, compression strength, density, and water absorption compared to conventional insulation panels. The addition of buffing dust reduced the thermal conductivity of polystyrene by 10%. The composite material also showed thermal stability and the presence of functional groups. Overall, this work not only solved energy consumption issues but also contributed to environmental protection and air pollution reduction through recycling and reusing buffing dust waste as thermal insulation material.
Article
Physics, Multidisciplinary
Mirza Naveed Jahangeer Baig, Nadeem Salamat, Faisal Z. Duraihem, Salman Akhtar, Sohail Nadeem, Jehad Alzabut, Salman Saleem
Summary: This study mathematically models the stagnation point flow over a heated stretching cylinder using the phase flow approach. The interaction between impinging stagnation flow and flow due to the stretching surface of the cylinder is thoroughly interpreted. Exact analytical solutions are computed and evaluated graphically. Heat transport analysis and Nusselt number interpretation are incorporated. The results show a dominant impinging stagnation flow for higher oncoming flow pressure and lower stretching velocity of the cylinder.
CHINESE JOURNAL OF PHYSICS
(2023)
Article
Physics, Applied
Sohail Nadeem, Bushra Ishtiaq, Nevzat Akkurt, Hassan Ali Ghazwani
Summary: This study focuses on the entropy analysis of a hybrid nanofluid in stagnant point flow. Nonlinear dimensionless ordinary differential equations are obtained through appropriate similarity transformations. The results show that the mixed convection parameter has a significant impact on the velocity field, entropy generation, and induced magnetic field, and both entropy and heat transfer rate increase with the increase of mixed convection parameter.
INTERNATIONAL JOURNAL OF MODERN PHYSICS B
(2023)
Article
Physics, Applied
Syed Saqib Shah, Rizwan ul Haq, Hakan F. Oztop, Ali Raza
Summary: The study examines the influence of Magnetohydrodynamics (MHD) on the fluid in channel flow when a thin needle is present. A computational analysis is conducted to investigate the effects of inlet/outlet conditions with a curvilinear shaped body inserted in the channel. By using suitable dimensionless variables, the governing equations are transformed and various parameters are simulated to observe their impact on streamlines, isotherms, and temperature distribution at the mean position. The results show that Reynolds number, Richardson number, magnetic hydrodynamic, needle size and state all affect the local Nusselt number at the mean position.
INTERNATIONAL JOURNAL OF MODERN PHYSICS B
(2023)
Article
Engineering, Multidisciplinary
Sohail Nadeem, Shahbaz Ali, Nevzat Akkurt, Mohamed Bechir Ben Hamida, Shahah Almutairi, Hassan Ali Ghazwani, Sayed M. Eldin, Zareen A. Khan, A. S. Al-Shafay
Summary: This paper presents a comprehensive study on the mathematical modelling and numerical simulation of non-Newtonian blood flow in an idealized stenosed artery. The results show that the non-Newtonian nature of the fluid model significantly influences flow dynamics, with a greater degree of stenosis leading to higher velocity and pressure drop. Wall shear is substantially larger in stenotic passages, and the severity of stenosis is directly related to this increasing behavior.
ALEXANDRIA ENGINEERING JOURNAL
(2023)
Article
Thermodynamics
Sohail Nadeem, Shahbaz Ali, Jehad Alzabut, Mohamed Bechir Ben Hamida, Sayed M. Eldin
Summary: This study investigates the influence of hybrid nano-fluid on heat transport in a semi-annular channel using numerical methods. The hybrid nano-fluid consists of a liquid water with a suspension of SWCNT and MWCNT. Constant heat fluxes are applied to the channel walls. The finite volume approach is used to solve the governing equations. The results show that heat transport decreases as the volume fraction of MWCNT increases. The heat transfer from the walls to the fluid is affected by the curvature of the walls. The study provides velocity contours, isotherms, and local Nusselt number distributions for certain volume fractions of nanoparticles. It is discovered that walls with smaller curvature have stronger convection heat transfer. The pressure increases with the increase of nanoparticle volume percentage.
CASE STUDIES IN THERMAL ENGINEERING
(2023)
Article
Thermodynamics
S. Nadeem, R. Akber, H. A. Ghazwani, J. Alzabut
Summary: This study examines the behavior of steady and incompressible magnetohydrodynamics fluid flow with sinusoidal walls in a square cavity. The finite element method is used to numerically model the flow and heat transfer, resulting in temperature and velocity profiles. The study finds that the temperature and velocity exhibit good convergence for various parameter values. The significant impact of heat transfer rate on the results is also discussed.
NUMERICAL HEAT TRANSFER PART A-APPLICATIONS
(2023)
Article
Materials Science, Multidisciplinary
S. Nadeem, Bushra Ishtiaq, Jehad Alzabut, Hassan A. Ghazwani, Ahmad M. Hassan
Summary: This study compares the time-dependent flow of a micropolar fluid between a linear stretching sheet and an exponential stretching sheet. It is found that the exponential stretching sheet provides more consequential results compared to the linear stretching sheet. Additionally, the material parameter shows an increase in the velocity field for both types of sheets.
RESULTS IN PHYSICS
(2023)
Article
Materials Science, Multidisciplinary
Jehad Alzabut, Sohail Nadeem, Sumaira Noor, Sayed M. Eldin
Summary: This article investigates the modeling and numerical simulation of Magnetohydrodynamic (MHD) buoyancy driven convection flow in a differentially heated, square enclosure. Numerical solutions are computed for different values of Rayleigh number ranging 103 < Ra < 107 and Hartmann number ranging 0 < Ha < 40. Comportment of MHD free convection heat flow from transient to steady state is numerically examined for a period of 0 to 1 s. It is seen that with increasing values of Rayleigh number there is increase in local Nusselt number distribution on heated side of the cavity, while velocity distribution in the flow domain decreases with increasing Hartmann number.
RESULTS IN PHYSICS
(2023)
Article
Thermodynamics
Sohail Nadeem, Bushra Ishtiaq, Jehad Alzabut, Sayed M. Eldin
Summary: Fractional calculus has various applications in different fields, including biology, physics, oscillation, wave propagation, and viscoelastic dynamics. This study focuses on the fractional derivative analysis of a Brinkman hybrid nanofluid with an inclined magnetic field using the Prabhakar fractional derivative and the Mittag-Leffler function. The effects of exponential heating and a vertical plate moving with exponential velocity are considered in the analysis. The results show that the fractional constraints lead to a decrease in both temperature and velocity fields.
CASE STUDIES IN THERMAL ENGINEERING
(2023)
Article
Nanoscience & Nanotechnology
Spyridon G. Kosionis, Emmanuel Paspalakis
Summary: In this study, we theoretically investigate the pump-probe response and the four-wave mixing spectrum in a hybrid system composed of a semiconductor quantum dot and a spherical metal nanoparticle. Using a density matrix methodology, we calculate the absorption/gain, dispersion, and four-wave mixing spectra, and analyze their spectral characteristics. We also apply the metastate theory and the dressed-state picture to predict the positions of the spectral resonances.
PHYSICA E-LOW-DIMENSIONAL SYSTEMS & NANOSTRUCTURES
(2024)
Article
Nanoscience & Nanotechnology
L. S. Lima
Summary: This study investigates quantum correlation and entanglement in the non-Hermitian Hubbard model. By analyzing quantum entanglement measures such as entanglement negativity and entropy, the effect of non-Hermitian imaginary hopping on the system is explored. It is found that in the large... limit, the non-Hermiticity reverses the behavior of the ground state energy and low-lying excitations.
PHYSICA E-LOW-DIMENSIONAL SYSTEMS & NANOSTRUCTURES
(2024)
Article
Nanoscience & Nanotechnology
Nam-Chol Ri, Chung-Sim Kim, Sang-Ryol Ri, Su-Il Ri
Summary: By decreasing the lattice thermal conductivity of GNR through chemical derivation and strain, enhancing the thermoelectric properties of the electron part can be an important method to approach PGEC. This paper proposes synthesized hybrid systems formed by chemical derivation in the middle parts of b-AGNRs, and investigates the band structures and thermoelectric properties of the electron part under different strains. The results show that the band gaps of the systems significantly increase under different strains.
PHYSICA E-LOW-DIMENSIONAL SYSTEMS & NANOSTRUCTURES
(2024)
Article
Nanoscience & Nanotechnology
Le T. T. Phuong, Tran Cong Phong
Summary: This study investigates the effects of gas molecules adsorbed on /312-borophene on its electronic heat capacity and thermal Schottky anomaly. The results show that the adsorbed gas molecules have different impacts on the electronic heat capacity, leading to the generation of various new energy levels.
PHYSICA E-LOW-DIMENSIONAL SYSTEMS & NANOSTRUCTURES
(2024)
Article
Nanoscience & Nanotechnology
Tianyan Jiang, Jie Fang, Wentao Zhang, Maoqiang Bi, Xi Chen, Junsheng Chen
Summary: This paper investigates the adsorption and sensing properties of transition metal-doped WSSe gas-sensitive devices towards H2, CO, and CO2 gases related to thermal runaway in Li-ion batteries using density functional theory. The results show that Ti, Mn, and Mo dopants preferentially bind to the S-surface of the WSSe monolayer, and all three monolayers exhibit significantly improved sensing characteristics, with chemisorption towards CO. Band structure analysis suggests that the Ti-WSSe monolayer has the potential to be used as a resistive CO detection sensor. Recovery time calculations indicate the reuse capabilities of the gas-sensitive devices. Mn-WSSe monolayer shows potential for H2 detection, while Mo-WSSe monolayer is more suitable for CO2 detection. This work lays the foundation for potential gas-sensitive applications of WSSe monolayer in thermal runaway scenarios, advancing research in gas sensing domains.
PHYSICA E-LOW-DIMENSIONAL SYSTEMS & NANOSTRUCTURES
(2024)
Article
Nanoscience & Nanotechnology
Olga A. Alekseeva, Aleksandr A. Naberezhnov, Ekaterina Yu. Koroleva, Aleksandr Fokin
Summary: This study investigates the temperature dependence of crystal structure and dielectric response in a nanocomposite material containing porous glasses and embedded sodium nitrate. The results reveal a crossover point in the temperature dependence of the order parameter of the structural transition in sodium nitrate nanoparticles, as well as a decrease in activation energy of sodium ions hopping conductivity during heating.
PHYSICA E-LOW-DIMENSIONAL SYSTEMS & NANOSTRUCTURES
(2024)
Article
Nanoscience & Nanotechnology
Lijun Cheng, Fang Cheng
Summary: This paper investigates the effects of electric and magnetic fields on the Goos-Hanchen (GH) shift in a semi-Dirac system. The results show that the magnitude and direction of the GH shift depend on various factors such as incidence angle, electric barrier height and width, and magnetic field. It is observed that there is a saltus step in GH shifts at the critical magnetic field, which decreases with increased potential barrier thickness. Additionally, the GH shift can be significantly enhanced by applying an electric field in the III region. These findings are important for the development of semi-Dirac based electronic devices.
PHYSICA E-LOW-DIMENSIONAL SYSTEMS & NANOSTRUCTURES
(2024)
Article
Nanoscience & Nanotechnology
Alexander K. Fedotov, Uladzislaw E. Gumiennik, Julia A. Fedotova, Janusz Przewoznik, Czeslaw Kapusta
Summary: The study conducted an improved analysis of carrier transport in single-layer graphene and hybrid structures, showing the coexistence of negative and positive contributions in magnetoresistive effect. Various models were used to analyze the dependences on temperature and magnetic field, providing insights into the behavior of electrical resistance in the structures.
PHYSICA E-LOW-DIMENSIONAL SYSTEMS & NANOSTRUCTURES
(2024)
Article
Nanoscience & Nanotechnology
Xuhui Peng, Tao Chen, Ruotong Chen, Shizheng Chen, Qing Zhao, Xiaoping Huang
Summary: In this study, a novel method was proposed to design and fabricate optoelectronic devices with highly precise controlled photorefractive liquid crystal structures. By utilizing quantum dots and electric tuning, a regular periodic grating was formed in a quantum dot-doped liquid crystal volume illuminated by a laser standing evanescent wave field. The obtained optical diffraction pattern showed equally spaced light spots and high diffraction efficiency, indicating a significant change in the refractive index of the nanostructured device.
PHYSICA E-LOW-DIMENSIONAL SYSTEMS & NANOSTRUCTURES
(2024)
Article
Nanoscience & Nanotechnology
Kai-Hua Yang, Xiao-Hui Liang, Huai-Yu Wang, Yi-Fan Wu, Qian-Qian Yang
Summary: In this work, a theoretical model is proposed to achieve the controllability of quantum interference and decoherence. The effects of intralead Coulomb interaction, interdot tunneling, and electron-phonon interactions on differential conductance are investigated. The results show the appearance of destructive interference, Fano interference, and negative differential conductance in strong dot-lead tunneling regions, while a characteristic pattern of positive and negative differential conductances appears in the weak dot-lead tunneling regime.
PHYSICA E-LOW-DIMENSIONAL SYSTEMS & NANOSTRUCTURES
(2024)
Article
Nanoscience & Nanotechnology
Xueying Wang, Qian Ma, Qi Zhang, Yi Wang, Lingyu Li, Dongheng Zhao, Zhiqiang Liu
Summary: Porous double-channel alpha-Fe2O3/SnO2 heterostructures with tunable surface/interface transport mechanism were successfully fabricated by electrospinning and calcination. These heterostructures exhibited a large specific surface area, providing more active sites and enhanced adsorption capacity. The optimal composite materials showed the highest response value and the fastest response/recovery times to DMF, along with good cycling performance, long-term stability, and high gas selectivity.
PHYSICA E-LOW-DIMENSIONAL SYSTEMS & NANOSTRUCTURES
(2024)
Article
Nanoscience & Nanotechnology
Donglin Guo, Zhengmeng Xu, Chunhong Li, Kejian Li, Bin Shao, Xianfu Luo, Jianchun Sun, Yilong Ma
Summary: Using full electron-phonon interactions and the Boltzmann transport equation, this study investigates the phonon scattering channel and electrical properties of graphene under anharmonic phonon renormalization (APRN). The results show that the APRN reduces the phonon frequency and three-phonon phase space with increasing temperature, affecting the acoustic branch more than the optical branch. The thermal conductivity of graphene decreases after considering three- and four-phonon scattering, and the primary scattering channels are identified. Furthermore, the APRN increases the strength of electron-phonon coupling and leads to an increase in n-type electric resistance at room temperature.
PHYSICA E-LOW-DIMENSIONAL SYSTEMS & NANOSTRUCTURES
(2024)
Article
Nanoscience & Nanotechnology
Hongping Zhao, Man Zhao, Dayong Jiang
Summary: The study proposes a broadband photodetector with high response, high sensitivity, and controllable band by integrating quantum dots and highly conductive materials. The PD composed of ZnO film/PbS quantum dots heterostructure shows excellent photoresponse performance in the UV-Vis-NIR range, with the peak responsivity increased by 550%, accompanied by significant red shift, faster response, and recovery speed. By using RF magnetron sputtering to prepare ultra-thin ZnO film, the impact of PbS quantum dots on the photoelectric properties of ZnO film is comprehensively and systematically discussed.
PHYSICA E-LOW-DIMENSIONAL SYSTEMS & NANOSTRUCTURES
(2024)
Article
Nanoscience & Nanotechnology
Ye Xuan Meng, Liwei Jiang, Yisong Zheng
Summary: Manipulating magnetism by electrical means is an effective method for realizing ultra-low power spintronic-integrated circuits. In this study, it is demonstrated that the two-dimensional semiconductor material InO monolayer can be tuned to a half-metallic state by applying a gate voltage, providing theoretical guidance for adjusting two-dimensional magnetic semiconductors.
PHYSICA E-LOW-DIMENSIONAL SYSTEMS & NANOSTRUCTURES
(2024)
Article
Nanoscience & Nanotechnology
Anusha Kachu, Aalu Boda
Summary: In this research, we investigated the impact of confinement nature on a neutral hydrogenic donor impurity in a quantum dot. The study demonstrated intriguing behavior in response to changes in potential shape, quantum dot parameters, and spin-orbit coupling strengths. The findings provide valuable insights into the fundamental physics of quantum dots and impurities and can aid in the design and optimization of QD-based technologies.
PHYSICA E-LOW-DIMENSIONAL SYSTEMS & NANOSTRUCTURES
(2024)