Article
Chemistry, Multidisciplinary
Diana Zahn, Joachim Landers, Juliana Buchwald, Marco Diegel, Soma Salamon, Robert Mueller, Moritz Koehler, Gernot Ecke, Heiko Wende, Silvio Dutz
Summary: This paper describes the preparation and magnetic properties of large single domain iron oxide nanoparticles. The particles exhibit single domain ferrimagnetic behavior and their properties are size-dependent. Additionally, the particles show promising potential for magnetic hyperthermia applications.
Article
Physics, Applied
Xinyu Li, Guangyuan Li, Zhihang Zhang, Wenjing Zhai, Wenhao Zheng, Liufang Chen, Lin Lin, Xiaohui Zhou, Zhibo Yan, J. -M. Liu
Summary: Habituation, a basic form of behavioral plasticity, is important for organisms to adjust their behaviors in response to external stimulation. However, few devices can mimic habituation, which includes opposite responses to the same repeated stimulus. In this study, a device of Au/LiTaO3/Pt was fabricated to demonstrate synaptic plasticity and habituation behavior, which was dependent on stimulus intensity and frequency. The habituation behavior was found to originate from the evolution of conductive domain walls in LiTaO3 ferroelectric.
APPLIED PHYSICS LETTERS
(2023)
Article
Chemistry, Multidisciplinary
Yi Wang, Weinan Zhao, Mei Han, Lu Guan, Lian Han, Afraz Hemraj, Kam Chiu Tam
Summary: A superhydrophobic surface with tunable nanoscale hydrophilicity has been constructed using structured Pickering emulsions, allowing for controllable manipulation of droplet nucleation and removal. The surface exhibits enhanced water deposition rate without sacrificing water transport rate, achieving high water harvesting flux. This research has potential applications in water harvesting.
ANGEWANDTE CHEMIE-INTERNATIONAL EDITION
(2022)
Article
Instruments & Instrumentation
Lennart Behlen, Andreas Warkentin, Andreas Ricoeur
Summary: This paper theoretically investigates the potential of exploiting the non-linear ferroelectric effect for energy harvesting, with a focus on identifying appropriate mechanical and electrical process parameters. The study utilizes a condensed method to simulate material behavior and optimize controllable parameters, presenting two types of cycles and associated optimal process parameters. Evaluation of quality and reliability aspects in ferroelectric energy harvesting cycles is also discussed.
SMART MATERIALS AND STRUCTURES
(2021)
Article
Materials Science, Ceramics
Vivek Korde, Naresh Patil, Sanjay Shamkuwar
Summary: Ferroelectric domain engineering is important for studying the dipolar structure of these materials, which is formed due to defects and imperfections introduced through doping. In this study, an Al-doped KNbO3 single crystal was prepared and the domain structure was studied by applying electric fields. The critical field for nucleation of new domains in the Al-doped KNbO3 crystal was found to be slightly lower than that of the pure KNbO3 crystal.
CERAMICS INTERNATIONAL
(2022)
Article
Chemistry, Multidisciplinary
Yunchen Zhang, Junqi Mao, Ren-Kui Zheng, Jiawei Zhang, Yonghui Wu, Xiaobing Wang, Kexin Miao, Hongbo Yao, Liya Yang, Haiwu Zheng
Summary: 2D ferroelectric CuInP2S6 (CIPS) is used to enhance the output performance of a piezoelectric nanogenerator (PENG), resulting in a 3.8 times increase in short-circuit current compared to unpolarized CIPS-based PENG. The ferroelectric polarization reinforces the effective piezoelectric constant of CIPS nanoflakes and enhances the migration and hopping of copper ions, improving the output performance. Additionally, the CIPS-based PENG shows potential for voice recognition integrated with deep learning technology, achieving a high classification accuracy of 96% for letter sounds.
ADVANCED FUNCTIONAL MATERIALS
(2023)
Article
Chemistry, Multidisciplinary
Ji Yeon Kim, Seokyeong Lee, Sejin Lee, Kyuho Lee, Yoon Huh, Young Eun Kim, Jae Won Lee, Chang Eun Lee, Donghwan Kim, Byeong Jin Yim, Joona Bang, Yong Soo Cho, Eunkyoung Kim, June Huh, Cheolmin Park, Jin-Kyun Lee
Summary: A novel organic synthetic route is reported for developing a polymer with both ferroelectric and electroluminescent properties, enabling the fabrication of a self-powered flexible display. The multifunctional polymer exhibits excellent light emission and combines ferroelectricity, luminescence, and pliability.
CELL REPORTS PHYSICAL SCIENCE
(2022)
Article
Materials Science, Ceramics
Yiyang Wen, Chongjun He, Lianxu Ye, Xingrong Zhu, Chenguang Deng, Ruixing Xu, Ziyun Chen, Hao Yang, Feifei Wang, Yuangang Lu, Youwen Liu
Summary: This study successfully synthesized a lead-free ferroelectric single crystal (Ba0.77Ca0.23TiO3) using an improved Czochralski method. The BCT crystal showed excellent piezoelectric, ferroelectric, and dielectric properties, particularly when oriented along the <001> direction.
CERAMICS INTERNATIONAL
(2022)
Article
Chemistry, Multidisciplinary
Tiannan Yang, Cheng Dai, Long-Qing Chen
Summary: We studied the thermodynamics of nanoscale polar structures in PbTiO3/SrTiO3 ferroelectric superlattices induced by above-bandgap optical excitation using a phase-field model. The light-excited carriers play a crucial role in the charge compensation and thermodynamic stabilization of the observed supercrystal. Different mechanical and electrical boundary conditions can stabilize other nanoscale polar structures by balancing short-range exchange interactions and long-range electrostatic and elastic interactions. This work provides insights into the formation and richness of nanoscale structures under light stimulation and offers theoretical guidance for manipulating their thermodynamic stability.
Review
Chemistry, Physical
He Qi, Aiwen Xie, Ruzhong Zuo
Summary: With the development of energy-storage technology and power electronics industry, there is a high demand for dielectric capacitors with high energy density due to their high power density. Ferroic dielectrics, especially those with dipole moments in the perovskite unit cells, show a large dielectric response under electric fields, making them suitable for achieving high energy-storage density. Destroying long-range ferroelectric/antiferroelectric ordering by enhancing compositional disorder has been found to greatly improve energy-storage properties. In addition, the heterogeneous structure of these materials contributes to excellent temperature stability.
ENERGY STORAGE MATERIALS
(2022)
Review
Chemistry, Multidisciplinary
Lu Han, Guohua Dong, Ming Liu, Yuefeng Nie
Summary: Transition metal perovskite oxide membranes are attracting attention in condensed matter physics and materials science due to their unique structural tunability and stacking ability. These freestanding membranes show extraordinary flexibility and tunability exceeding traditional materials. They can be stacked with other materials to create novel heterostructures.
ADVANCED FUNCTIONAL MATERIALS
(2023)
Article
Nanoscience & Nanotechnology
Mingyang Yan, Shengwen Liu, Yuan Liu, Zhida Xiao, Xi Yuan, Di Zhai, Kechao Zhou, Qingping Wang, Dou Zhang, Chris Bowen, Yan Zhang
Summary: Flexible piezoelectric nanogenerators play a crucial role in powering next-generation wearable electronic devices. This study successfully fabricated highly polarized piezoelectric composite films by synthesizing novel Ag-decorated BCZT heterostructures, which significantly improved the energy-harvesting performance.
ACS APPLIED MATERIALS & INTERFACES
(2022)
Article
Chemistry, Multidisciplinary
Ankit Negi, Hwang Pill Kim, Zilong Hua, Anastasia Timofeeva, Xuanyi Zhang, Yong Zhu, Kara Peters, Divine Kumah, Xiaoning Jiang, Jun Liu
Summary: This paper demonstrates the room-temperature thermal modulation in 2.5 mm-thick Pb(Mg1/3Nb2/3)O-3-xPbTiO(3) (PMN-xPT) single crystals. Through the use of advanced poling conditions and a systematic study on composition and orientation dependence, a range of thermal conductivity switching ratios, with a maximum of approximately 1.27, is observed. The simultaneous measurements of piezoelectric coefficient (d(33)), domain wall density using polarized light microscopy (PLM), and birefringence change using quantitative PLM reveal an increase in domain wall density at intermediate poling states (0< d(33)< d(33(max)) compared to the unpoled state.
ADVANCED MATERIALS
(2023)
Review
Physics, Applied
Ahmad Safari, E. Koray Akdogan, Jack D. Leber
Summary: This article provides a concise overview of ferroelectric ceramics and composites, which are the backbone of transducer applications. The underlying principles of piezoelectric composites based on ferroelectric ceramics are developed, and the focus is on diphasic piezoelectric composites that have revolutionized transducer engineering in fields such as sonar and medical ultrasound imaging. The article also discusses the application of traditional composite strategies and advances in fabrication technologies to rapidly growing fields such as dielectric energy storage and piezoelectric energy harvesting.
JAPANESE JOURNAL OF APPLIED PHYSICS
(2022)
Article
Nanoscience & Nanotechnology
Krishna Maity, Jean-Francois Dayen, Bernard Doudin, Roman Gumeniuk, Bohdan Kundys
Summary: As global data generation continues to rise, there is a growing demand for revolutionary in-memory computing methodologies and efficient machine learning solutions. This paper reports on an optical and monochromatic approach to neuromorphic signal processing for brain-inspired functions, eliminating the need for electrical pulses. The demonstrated device is able to reproduce the exact signal profile of brain tissues with more than two orders of magnitude faster response.
ACS APPLIED MATERIALS & INTERFACES
(2023)
Article
Multidisciplinary Sciences
Andrei Hernandez-Robles, David Romeu, Arturo Ponce
Summary: The relative orientations of rotated graphene bi-layers (RGBs) deposited by chemical vapor deposition were measured, revealing spontaneously occurring preferred orientations. These special orientations result in simpler displacement fields and lead to the re-orientation of RGBs to simplify their strain fields.
Article
Materials Science, Multidisciplinary
M. A. Zambrano-Serrano, Carlos A. Hernandez, O. de Melo, M. Behar, S. Gallardo-Hernandez, Y. L. Casallas-Moreno, A. Ponce, A. Hernandez-Robles, D. Bahena-Uribe, C. M. Yee-Rendon, M. Lopez-Lopez
Summary: n-GaN/AlN heterostructures were grown on Si(111) substrates by molecular beam epitaxy. The effect of silicon doping concentration on the structural and optical properties was studied. It was found that silicon doping could reduce the dislocation density and the yellow band, and induce a specific mosaic structure. However, there was a slight degradation in crystal quality for heavily doped samples.
MATERIALS RESEARCH EXPRESS
(2022)
Article
Chemistry, Physical
Ivan Yakovkin, Andrii Lesiuk, Mykhailo Ledney, Victor Reshetnyak
Summary: The orientational instability of a director in a planar flexoelectric nematic liquid crystal cell in a constant electric field perpendicular to the cell substrates is investigated. The influence of the initial surface orientation, liquid crystal, and electric field on the orientation of the easy axis on one of the polymer substrates is studied. The reorientation of the elastic parts of the polymer molecules of the substrate is due to the interaction of intrinsic or induced dipole moments with the electric field. The effect of the electric field on the surface free energy of the nematic is considered to be linear or quadratic. The temporal behavior of the director after voltage application and its return to the initial homogeneous state after switching off the voltage are studied. The characteristic turn-on/off times and the time of reaching the stationary state are calculated and their dependence on the system parameters is investigated. The transmittance of the nematic liquid crystal cell for normally incident light is also calculated.
JOURNAL OF MOLECULAR LIQUIDS
(2022)
Article
Crystallography
Guillermo Barcena-Gonzalez, Andrei Hernandez-Robles, Alvaro Mayoral, Lidia Martinez, Yves Huttel, Pedro L. Galindo, Arturo Ponce
Summary: Electron backscattering diffraction analyzes crystalline phases at large scales, while precession electron diffraction obtains 4D-STEM data for nanometric structure elucidation. Both techniques have limitations due to probe size and complexity of image acquisition. Advanced machine learning techniques, such as deep learning, can overcome these limitations. This research demonstrates how Gabor filters can effectively extract features from electron microscopy images, reducing the need for large training datasets. The combination of Gabor filters and unsupervised learning enables particle segmentation and crystal orientation mapping at atomic scale.
CRYSTAL RESEARCH AND TECHNOLOGY
(2023)
Article
Materials Science, Multidisciplinary
E. Gutierrez, E. Salazar, A. Salinas, R. Deaquino, A. Ponce, M. Yacaman, D. Alducin, E. Ortega, A. Bedolla, B. Fernandez, R. Martinez, C. Garay
Summary: This paper investigates the influence of graphite and milling time on the texture, microstructure, and mechanical properties of AA7075-graphite composites produced through mechanical alloying and hot extrusion. Various characterization techniques were used, including electron microscopy, X-ray diffraction, and electron diffraction, and mechanical properties were evaluated through tensile tests. The results show that the particle and crystallite size of the milled powders affect the grain size of the extruded samples. The presence of deformation texture components in recrystallized samples is explained by the oriented nucleation mechanism. Hardness, yield strength, and ultimate tensile strength increase with graphite content and milling time, while elongation to fracture decreases. The size of recrystallized grains decreases with increasing milling time and graphite content. The investigated composites are enhanced by grain refinement, dispersion of certain compounds, and the development of a random texture.
MATERIALS CHEMISTRY AND PHYSICS
(2023)
Article
Chemistry, Analytical
Chris Rightsell, David Sanchez, Jose Escudero, Eduardo Ortega, Gangadharan Ajithkumar, Dhiraj Sardar, Arturo Ponce
Summary: Single-crystal Er3+:YAG has traditionally been used as a laser material, but recent research suggests that polycrystalline ceramic Er3+:YAG is a cost-effective and easily produced alternative. However, there has been limited research on the synthesis and spectroscopic characterization of Er3+:YAG nanocrystals. This study presents the synthesis of nanocrystalline Er3+:YAG and compares its spectroscopic properties with single-crystal and polycrystalline ceramic counterparts. The results show similar optical properties among the three hosts, with the nanocrystals demonstrating higher intensity in the 1.53 mu m emission. These findings highlight the potential of Er3+:YAG nanocrystals as laser materials.
Article
Materials Science, Multidisciplinary
O. Sova, T. J. Sluckin, S. Kaur, H. F. Gleeson, V. Reshetnyak
Summary: This paper constructs a theoretical model for the electronic liquid crystal contact lens for the correction of presbyopia. The study shows good agreement between theory and experimental data, although the precise parameters of the lens differ slightly from the original design. The model is useful for engineering optimization of the existing prototype.
OPTICAL MATERIALS EXPRESS
(2023)
Article
Crystallography
Svitlana P. Bielykh, Liana Lucchetti, Victor Yu. Reshetnyak
Summary: We proposed a theoretical model of a cylindrical tunable liquid crystal lens based on the modulation of anchoring energy. The model describes the dependence of the focal length on the applied voltage and presents a theoretical study of the lens aberrations. The results obtained are of general relevance and can be used to optimize the performances of every type of liquid crystal lens with a parabolic profile.
Article
Optics
Ivan Yakovkin, Victor Reshetnyak
Summary: This study investigates the tunability of plasmonic resonances in gold and silver nanosphere arrays embedded in a liquid crystal matrix. The results show that the optical properties of these arrays can be modulated by reorienting the liquid crystal, leading to a shift in the plasmonic resonance wavelength. Both gold and silver nanosphere arrays exhibit notable near-field amplification.
Article
Materials Science, Multidisciplinary
Kyung Min Lee, Victor Yu. Reshetnyak, Cedric P. P. Ambulo, Zachary M. M. Marsh, Michael E. E. McConney, Nicholas P. P. Godman
Summary: This study introduces a novel anti-counterfeiting material, holographic polymer stabilized liquid crystal gels (H-PSLC gels), which can switch optical colors and patterns under electric current. The optical properties of H-PSLC gels can be controlled by adjusting the magnitude and direction of the electric current.
MATERIALS ADVANCES
(2023)
Article
Chemistry, Multidisciplinary
V. Yu. Reshetnyak, I. P. Pinkevych, N. P. Godman, T. J. Bunning, D. R. Evans
Summary: The reflection spectrum of a hybrid structure, consisting of a metal film and a holographic grating made of polymer and liquid crystal layers, is investigated. An optical Tamm state (OTS) is formed in the region of the grating band gap, resulting in a narrow dip in the reflection spectrum. The parameters of the polymer and liquid crystal determine the spectral position of the dip, while the type and thickness of the metal affect its magnitude.
Article
Physics, Fluids & Plasmas
V. Yu. Reshetnyak, I. P. Pinkevych, T. J. Bunning, M. E. McConney, D. R. Evans
Summary: Theoretical study is conducted on the reflection spectrum of linearly polarized light by a system composed of a metal film and two adjacent cholesteric liquid crystals (CLCs) with opposite helical twists. The system includes a dielectric index-matching layer (DIML) between the metal film and the CLC layers. It is found that optical Tamm states (OTSs) can be excited by linearly polarized light in such a system. The influence of CLC pitch, refractive indices, and thicknesses of DIML and metal film on the manifestation of OTSs in the reflection spectrum is examined, and the strong influence of DIML thickness on OTS wavelength and the appearance of multiple OTSs with increasing DIML thickness are observed.
Article
Physics, Fluids & Plasmas
A. I. Lesiuk, M. F. Ledney, V. Yu. Reshetnyak
Summary: The paper presents a theoretical description of light-induced nematic liquid crystal reorientation in a cell with gold nanoparticles deposited on one of the bounding substrates. The study shows that the surface plasmon resonance in the nanoparticles significantly affects the threshold of director reorientation. A mathematical model of surface free-energy density is given, considering the influence of the local electric field on the near-surface nematic layer at the substrate with gold nanoparticles. The calculated threshold intensity of director orientation instability and its dependence on the wavelength of incident light and the degree of filling of the surface with gold nanoparticles are analysed. The comparison of theoretical calculations with experimental data confirms the full adequacy of the proposed theoretical model.
Proceedings Paper
Engineering, Electrical & Electronic
Saleha Qissi, Partha P. Banerjee
Summary: This study presents a method of converting digital transmission holograms to digital volume reflection holograms by simulating a reflection grating, achieving excellent wavelength selectivity during readout. Experimental results demonstrate the potential application of this method in 3D color holographic displays.
ULTRA-HIGH-DEFINITION IMAGING SYSTEMS V
(2022)
Article
Materials Science, Multidisciplinary
Arturo Galindo, Jose Luis Reyes-Rodriguez, Cristian Botez, Mario Moreno, Arturo Ponce
Summary: The miniaturization of magnetic components has led to significant progress in expanding magnetic nanostructures into three dimensions. By using template-assisted electrodeposition, researchers have successfully fabricated vertically assembled NW arrays with high SA:V ratios, demonstrating the potential for new paths in three-dimensional nanofabrication.
MATERIALS ADVANCES
(2022)
