Article
Engineering, Electrical & Electronic
E. K. Suresh, P. Narayanan, N. S. Arun, R. Ratheesh
Summary: BZV-filled HDPE composites were prepared using mixing and compression molding techniques, and their phase purity, microstructure, and microwave dielectric properties were studied. The composites exhibited good thermal and mechanical properties and were successfully used in the fabrication of a microstrip patch antenna.
JOURNAL OF ELECTRONIC MATERIALS
(2022)
Article
Materials Science, Ceramics
J. K. Radhakrishnan, M. Kumara, Geetika
Summary: The study reveals that microwave power has a direct impact on the characteristics of ZnO nanostructures, allowing for morphology changes by adjusting microwave power. The fast growth along the high energy polar faces of ZnO is the reason for the formation of one dimensional ZnO structures, while the formation of hollow ZnO rods is due to further etching/material removal from the tip of the rods under high microwave power conditions at long growth durations.
CERAMICS INTERNATIONAL
(2021)
Article
Materials Science, Composites
Sourav Kumar Mahapatra, Alok Satapathy
Summary: This investigation develops and characterizes a type of multi-phase hybrid composites made of bi-directional ramie fibers, epoxy resin, and micro-sized titania particles in different proportions. The composites are fabricated using the hand layup technique and subjected to physical, compositional, and mechanical characterization tests. The results show that the inclusion of titania particles improves the mechanical properties and hardness of the composites, making them potentially useful as functional materials in wear-prone situations.
POLYMER COMPOSITES
(2023)
Article
Multidisciplinary Sciences
Sergey Zayko, Ofer Kfir, Michael Heigl, Michael Lohmann, Murat Sivis, Manfred Albrecht, Claus Ropers
Summary: The study demonstrates an ultrafast microscopy based on high-harmonic radiation for direct imaging of ultrafast phenomena and capturing femtosecond spin dynamics at the nanoscale. Real-space magnetic imaging allows for observation of local magnetization dynamics, with implications for studying non-equilibrium magnetic evolution. The ultrafast imaging technique provides high spatio-temporal resolution, offering potential applications in magnetism, phase transitions, and carrier dynamics.
NATURE COMMUNICATIONS
(2021)
Article
Materials Science, Multidisciplinary
Tyler R. Harvey, Nara Rubiano da Silva, John H. Gaida, Marcel Moeller, Armin Feist, Sascha Schaefer, Claus Ropers
Summary: This article reviews the physical interactions that produce ultrafast magnetic contrast with electrons and highlights the recent emergence of ultrafast Lorentz transmission electron microscopy. It demonstrates that ultrafast electron imaging will be a vital tool in solving pressing problems in magnetism and magnetic materials.
Article
Engineering, Electrical & Electronic
Cem Gocen, Merih Palandoken
Summary: This paper introduces a novel machine learning assisted microwave sensor for characterizing the dielectric parameters of ethanol liquid samples. The proposed sensor is designed with intercoupled spiral resonators and has features such as reusability and easy fabrication.
IEEE SENSORS JOURNAL
(2022)
Article
Chemistry, Multidisciplinary
Haihua Liu, Thomas E. Gage, Prem Singh, Amit Jaiswal, Richard D. Schaller, Jau Tang, Sang Tae Park, Stephen K. Gray, Ilke Arslan
Summary: This study reports direct imaging of the local plasmonic coupling between single Au nanocapsules and graphene step edges at the nanometer scale for the first time, indicating that this hybrid system could be used to manipulate the localized electromagnetic field on the nanoscale.
Article
Engineering, Multidisciplinary
Mustafa Berkan Bicer
Summary: In this study, a 3D-printed curved-shaped substrate was used to develop an octagonal microstrip antenna as a microwave sensor for measuring the dielectric constants of liquids. The sensor was designed and analyzed using computational software, and its performance was validated through simulations and measurements. The results showed strong agreement between simulation and measurement data, indicating the effectiveness of the proposed sensor for measuring dielectric constants of liquids.
Article
Biochemical Research Methods
Daniel X. Du, Anthony W. P. Fitzpatrick
Summary: Ponderomotive phase plates have demonstrated the possibility of achieving temporally consistent phase contrast in electron microscopes using high-fluence static laser modes in Fabry-Perot cavities. This study investigates the use of pulsed laser beams to generate high fluences and finds that picosecond or shorter interactions are necessary for meaningful fluences and phase shifts, with higher pulse energies and smaller beam waists leading to higher fluences. The results also demonstrate that the transient nature of laser pulses eliminates the influence of Kapitza-Dirac diffraction patterns observed in static resonator cases. Additionally, a prediction is made that a total laser pulse energy of 8.7 mJ is sufficient to induce the required p/2 phase shift for Zernike-like phase microscopy.
CELL REPORTS METHODS
(2023)
Article
Chemistry, Physical
Jiaji Yang, Xiongzhang Liu, Wei Gong, Tao Wang, Xian Wang, Rongzhou Gong
Summary: The study introduces a design concept of meta-structure for temperature-insensitive and broadband microwave absorption by using three-phase composites, which enhances the MA properties at elevated temperatures. The meta-structure optimizes effective permittivity and achieves a reflection loss less than -5 dB in the frequency range of 8.2-18.0 GHz.
JOURNAL OF ALLOYS AND COMPOUNDS
(2022)
Article
Engineering, Electrical & Electronic
S. Prathap, W. Madhuri
Summary: Pb1-xCoxFe12O19 nano-crystallites with an average crystal diameter varying between 74 and 86 nm were prepared via sol-gel auto-combustion, showing a single-phase structure confirmed by XRD analysis. The surface morphology of the ferrites revealed a long hexagonal structure and dielectric characterization indicated that the composition x=0.75 is suitable for high definition television deflection yokes due to its high dielectric constant and low electrical conductivity.
JOURNAL OF ELECTRONIC MATERIALS
(2021)
Article
Engineering, Electrical & Electronic
Maede Chavoshi, Matko Martinic, Bart Nauwelaers, Tomislav Markovic, Dominique Schreurs
Summary: This article presents a novel structure of microwave sensor array for the dielectric characterization of liquid samples in biomedical applications. The array consists of four cascaded resonators, providing the capability to measure the complex permittivity of multiple samples simultaneously and independently. The fabricated sensors, incorporating couplers and defected grounded interdigitated capacitors (IDCs), exhibit high sensitivity. Each sensor in the array functions as a resonator whose resonance frequency and quality factor change according to the material under test (MUT). Water/ethanol mixtures of different concentrations were used for sensor calibration, and the changes in resonance behavior were correlated to dielectric permittivity. The fitting functions based on IDC's model showed high r-squared values and enabled precise permittivity extraction for liquids with a volume of 20 mu L in the frequency range of 3.87 GHz (for the sample with the highest permittivity) to 8 GHz.
IEEE TRANSACTIONS ON MICROWAVE THEORY AND TECHNIQUES
(2023)
Article
Chemistry, Multidisciplinary
Wei Liu, Haoran Yu, Yaolong Li, Aiqin Hu, Ju Wang, Guowei Lu, Xiaofang Li, Hong Yang, Lun Dai, Shufeng Wang, Qihuang Gong
Summary: For versatile lead-halide perovskite materials, trap states in both bulk and surface significantly affect optoelectronic behaviors and performance. Utilizing femtosecond pump-probe technique combined with PEEM, shallow and deep trap states were identified within a CsPbBr3 single-crystal microplate. The study revealed a high-defect tolerance to shallow traps within the microplate, while surface dynamics were dominated by deep traps. The ultrafast PEEM provided insights into fast electron transfer and accumulation of surface trap states, highlighting the importance of surface optimization for excellent electronic properties of perovskite materials.
Article
Multidisciplinary Sciences
A. E. Herguedas-Alonso, L. Aballe, J. Fullerton, M. Velez, J. I. Martin, A. Sorrentino, E. Pereiro, S. Ferrer, C. Quiros, A. Hierro-Rodriguez
Summary: The use of magnetic vector tomography/laminography allows access to nanoscale magnetization through a 3D experimental window. However, the large number of angular projections required for these methods leads to long measurement times. In this study, a fast method is presented to significantly reduce experiment time for quasi two-dimensional magnetic systems. The algorithm utilizes the Beer-Lambert equation in X-ray transmission microscopy to achieve 3D magnetic configuration of the sample. This method has been successfully demonstrated in permalloy microstructures and provides quantitative results with a reduced number of angular projections. The throughput of this methodology is x 10-x 100 times faster than conventional magnetic vector tomography, making it of great interest to the scientific community.
SCIENTIFIC REPORTS
(2023)
Article
Chemistry, Multidisciplinary
Huan Liu, Jiangcai Wang, Yuanshuang Liu, Yong Wang, Lujie Xu, Li Huang, Dameng Liu, Jianbin Luo
Summary: A new defect-induced ultrafast interlayer electron-phonon coupling pathway is identified in a WS2/graphene heterostructure. This interaction significantly reduces defect-related Raman resonant activity and accelerates the electron-phonon scattering time. Furthermore, the ultrafast interlayer coupling process is directly imaged.
ADVANCED MATERIALS
(2022)
Article
Chemistry, Physical
Erik Kieft, Karl B. Schliep, Pranav K. Suri, David J. Flannigan
STRUCTURAL DYNAMICS-US
(2015)
Article
Chemistry, Physical
W. Verhoeven, J. F. M. van Rens, M. A. W. van Ninhuijs, W. F. Toonen, E. R. Kieft, P. H. A. Mutsaers, O. J. Luiten
STRUCTURAL DYNAMICS-US
(2016)
Article
Microscopy
W. Verhoeven, J. F. M. van Rens, E. R. Kieft, P. H. A. Mutsaers, O. J. Luiten
Article
Microscopy
J. F. M. van Rens, W. Verhoeven, J. G. H. Franssen, A. C. Lassise, X. F. D. Stragier, E. R. Kieft, P. H. A. Mutsaers, O. J. Luiten
Article
Physics, Applied
Erik Kieft, Eric Bosch
JOURNAL OF PHYSICS D-APPLIED PHYSICS
(2008)
Article
Physics, Applied
J. F. M. van Rens, W. Verhoeven, E. R. Kieft, P. H. A. Mutsaers, O. J. Luiten
APPLIED PHYSICS LETTERS
(2018)
Article
Microscopy
S. Meuret, M. Sola Garcia, T. Coenen, E. Kieft, H. Zeijlemaker, M. Latzel, S. Christiansen, S. Y. Woo, Y. H. Ra, Z. Mi, A. Polman
Article
Chemistry, Physical
I. G. C. Weppelman, R. J. Moerland, L. Zhang, E. Kieft, P. Kruit, J. P. Hoogenboom
STRUCTURAL DYNAMICS-US
(2019)
Article
Chemistry, Physical
W. Verhoeven, J. F. M. van Rens, W. F. Toonen, E. R. Kieft, P. H. A. Mutsaers, O. J. Luiten
STRUCTURAL DYNAMICS-US
(2018)
Article
Engineering, Electrical & Electronic
R Groenen, ER Kieft, JL Linden, MCM Van De Sanden
JOURNAL OF ELECTRONIC MATERIALS
(2006)
Article
Instruments & Instrumentation
ER Kieft, CHJM Groothuis, JJAM van der Mullen, V Banine
REVIEW OF SCIENTIFIC INSTRUMENTS
(2005)
Article
Physics, Applied
N de Vries, X Zhu, ER Kieft, J van der Mullen
JOURNAL OF PHYSICS D-APPLIED PHYSICS
(2005)
Article
Physics, Fluids & Plasmas
ER Kieft, K Garloff, JJAM van der Mullen, V Banine
Article
Physics, Fluids & Plasmas
ER Kieft, JJAM van der Mullen, GMW Kroesen, V Banine, KN Koshelev