Article
Chemistry, Physical
Song Tang, Wenxuan Chang, Gui Li, Jianfeng Sun, Yan Du, Xindan Hui, Qian Tang, Zhihao Hu, Jiaqi Li, Jie Chen, Wencong He, Hengyu Guo
Summary: In this study, a multi-layered, wavy super-structured-triboelectric nanogenerator (SS-TENG) is designed to efficiently convert random vibration energy into electricity. The output performance of the SS-TENG is greatly improved by combining the charge excitation mechanism, and the volume charge density can reach up to 129 mCmiddotm(-3). The resonant frequency width of the SS-TENG can be widened by changing the parameters of the superstructure, providing a effective strategy for harvesting vibration energy and broadening frequency response.
Article
Chemistry, Multidisciplinary
Bumsu Park, Ja Kyung Lee, Christoph T. Koch, Martin Woelz, Lutz Geelhaar, Sang Ho Oh
Summary: Growing an InxGa1-xN/GaN multi-quantum well heterostructure in nanowire form can overcome limitations in conventional planar heterostructure LEDs by relaxing the strain induced in the heterostructure through the sidewalls of the nanowire. This study demonstrates techniques for mapping the complex strain distribution within an In0.3Ga0.7N/GaN MQW heterostructure embedded in a GaN nanowire and provides insights into the strain-induced piezoelectric fields in nanowire LEDs.
Article
Chemistry, Analytical
Jelena Lovric, Neda Najafinobar, Michael E. Kurczy, Olivier De Castro, Antje Biesemeier, Lena von Sydow, Magnus Klarqvist, Tom Wirtz, Per Malmberg
Summary: This study developed correlative methodologies to investigate iron accumulation and subcellular localization in alveolar macrophages. By using nanoscale magnetic sector secondary ion mass spectrometry (SIMS) and various high-resolution imaging technologies, they found that iron accumulates in mitochondria and electrolucent compartments such as vacuoles, lysosomes, and lipid droplets.
ANALYTICAL CHEMISTRY
(2022)
Article
Chemistry, Physical
Shihao Wang, Longlu Wang, Lingbin Xie, Weiwei Zhao, Xia Liu, Zechao Zhuang, YanLing Zhuang, Jing Chen, Shujuan Liu, Qiang Zhao
Summary: Defect engineering is an effective strategy to optimize the catalytic performance of MoS2 by introducing dislocations. This study successfully synthesized numerous dislocation-strained structures in MoS2 nanosheets through low-temperature hydrothermal synthesis. The high-density dislocations and corresponding strain field resulted in superior catalytic activity under visible light. This work provides a new pathway for improving the catalytic activity of MoS2 through dislocation-strained synergistic modulation.
Article
Computer Science, Artificial Intelligence
Jihong Pei, Yebin Chen, Yang Zhao, Chao Wang, Xuan Yang
Summary: This paper proposes a self-adjusting multilayer nonlinear coupled mapping (SMNCM) network for low-resolution image recognition tasks. The network consists of a feature extractor and a feature fusion module, which collaboratively learn weights and other parameters for correct classification. Experimental results demonstrate the effectiveness of the proposed method.
APPLIED SOFT COMPUTING
(2022)
Article
Chemistry, Applied
Nianming Jiao, Yanyan Yuan, Yuan Yao, Long Liu, Yanqiang Zhang
Summary: This study presents a new strategy of improving the energy capacity of ionic liquids by introducing strained carbocycles. The experimental results show that the ionic liquids with strained carbocycles have better energy properties and densities, making them potential candidates for high-energy rocket fuels.
FUEL PROCESSING TECHNOLOGY
(2022)
Article
Chemistry, Multidisciplinary
Gwangwoo Kim, Hyong Min Kim, Pawan Kumar, Mahfujur Rahaman, Christopher E. Stevens, Jonghyuk Jeon, Kiyoung Jo, Kwan-Ho Kim, Nicholas Trainor, Haoyue Zhu, Byeong-Hyeok Sohn, Eric A. Stach, Joshua R. Hendrickson, Nicholas R. Glavin, Joonki Suh, Joan M. Redwing, Deep Jariwala
Summary: Researchers have demonstrated a lithography-free method to create large areas of high-density localized emitters. By inducing strain in a WSe2 monolayer, high-density luminescence can be generated in the strained regions.
Article
Engineering, Mechanical
Thomas Edward James Edwards, Fabio Di Gioacchino, William John Clegg
Summary: In a lamellar TiAl alloy, plastic deformation mainly occurs in soft-mode colonies through slip parallel to the lamellae and near lamellar interfaces under high cycle tensile fatigue conditions. At 25 degrees C, the maximum applied stress has a greater influence on the number of slip bands than the number of loading cycles.
INTERNATIONAL JOURNAL OF FATIGUE
(2021)
Article
Materials Science, Ceramics
Hongbin Yuan, Lili Li, Hui Hong, Zhihua Ying, Xiaolong Zheng, Lin Zhang, Fei Wen, Zhuo Xu, Wei Wu, Gaofeng Wang
Summary: BiFeO3-BaTiO3 solid solutions with Li2CO3 sintering aid show reduced sintering temperature, increased relative density, and decreased dielectric loss and strain hysteresis; CMOS technology helps reduce dielectric loss and strain hysteresis in ceramics; BF-BT-L ceramics exhibit positive temperature-dependent strain at 200℃, making them suitable for high-performance lead-free piezoelectric multilayer actuator applications.
CERAMICS INTERNATIONAL
(2021)
Article
Multidisciplinary Sciences
Li Long, Wenlin Liu, Zhao Wang, Wencong He, Gui Li, Qian Tang, Hengyu Guo, Xianjie Pu, Yike Liu, Chenguo Hu
Summary: This study introduces a floating self-excited sliding TENG which solves the issue of low output in traditional floating TENG, achieving high charge density and output, and can continuously power small electronics.
NATURE COMMUNICATIONS
(2021)
Article
Materials Science, Multidisciplinary
Xu Li, Yanyan Ouyang, Ran Zhang, Xingfu Tao, Yongfeng Geng, Shi Li, Yi Zhang, Huifang Gao
Summary: The study uses high resolution transmission electron microscope and geometric phase analysis to investigate strain distribution in GaAs/AlAs multilayer superlattices. It reveals that strains increase farther from the substrate and exhibit anisotropy in different directions. The interface with large strain is more likely to experience cracking or failure.
Article
Chemistry, Physical
D. Andersen, H. Chen, S. Pal, L. Cressa, O. De Castro, T. Wirtz, G. Schmitz, S. Eswara
Summary: In this study, high-resolution imaging of hydrogen and deuterium within Mg2Ni/Mg2NiH4 hydrogen storage thin films was achieved using a self-developed secondary ion mass spectrometer (SIMS) system attached to a commercially available dual-beam focused ion beam - scanning electron microscope (FIB-SEM) instrument. A novel approach using laser scanning confocal microscopy (LSCM) was demonstrated to measure the size, shape, and distribution of the hydride phase in partially transformed films. The combination of these techniques provides new insights on hydride nucleation and growth within the Mg2NiHx system. Additionally, the efficacy of tracking deuterium as a hydrogen analog for SIMS imaging in high-vacuum chambers was demonstrated.
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
(2023)
Article
Materials Science, Multidisciplinary
S. Sruthi, Hemanta Kumar Kundu, Prasad Vishnubhotla, Aveek Bid
Summary: This article reports the experimental observation of the coexistence of insulating and metallic phases deep within the commensurate charge density wave phase in high-quality devices of few-layer 1T-TaS2. Through detailed conductance fluctuation spectroscopy, it is established that the mixed phase consists of insulating regions surrounded by one-dimensional metallic domain walls. The electronic ground state of 1T-TaS2 can be drastically affected by strain, eventually leading to the collapse of the Mott gap in the commensurate charge density wave phase.
PHYSICAL REVIEW MATERIALS
(2021)
Article
Biochemistry & Molecular Biology
Rogerio A. Bataglioli, Bruno S. Leao, Carolyn E. Mills, Joao Batista M. Rocha Neto, Thiago B. Taketa, Bradley D. Olsen, Marisa M. Beppu
Summary: The self-assembled layer-by-layer technique is a popular method for engineering biofunctional surfaces. This paper introduces an automated, high-throughput approach to depositing polyelectrolyte multilayers (PEMs) in multiwell plates, allowing for screening of numerous film formulations simultaneously. The method was successfully validated by studying the deposition of different types of films and analyzing their properties. This study demonstrates the challenges associated with predicting the growth and properties of multilayer films and highlights the importance of the high-throughput layer-by-layer method in accelerating film development.
Article
Materials Science, Multidisciplinary
Shuaishuai Liu, Feixiang Yang, Hong Yang, Guangsheng Huang, Aitao Tang, Xianhua Chen, Bin Jiang, Fusheng Pan
Summary: This study characterized the strain evolution at the grain level in Mg-13Gd alloy with heterogeneous and homogeneous structures. The results showed that both structures exhibited strain heterogeneity within the grains, with the magnitude of local deformation being much higher than the macroscopic strain. The formation of strain bands in the coarse grains of the heterogeneous structure contributed to strain delocalization and improved strain hardening capacity.
MATERIALS CHARACTERIZATION
(2022)
Article
Chemistry, Physical
Wenke Wang, Xinhua Liu, Zhihao Wang, Miaomiao Chen, Wenzhen Chen, Wencong Zhang, Hyoung Seop Kim
Summary: This study investigates the effects of asymmetric basal texture on the stretchability and microstructure variations of magnesium alloy sheet. The results show that plastic deformation is concentrated in the central region of the sample during stretch forming, and the transverse direction sample has higher stretch formability. This is attributed to the weak basal texture in the transverse direction sample, which activates more basal slip and tension twinning. Additionally, the activation of basal slip narrows the spread angle of the basal pole for the transverse direction sample, while only increasing the basal texture intensity for the rolling direction sample.
JOURNAL OF ALLOYS AND COMPOUNDS
(2023)
Article
Chemistry, Physical
Sujung Son, Dowon Lee, Hyeonseok Kwon, Jongun Moon, Ki Beom Park, Aeree Kim, Jungwoo Choi, Jin-Hwan Jeong, Sungho Cho, Hyoung Seop Kim
Summary: A new class of Ti-containing medium-entropy alloys (Ti-MEAs) was designed and three equiatomic Ti-MEAs were successfully cast. The microstructures and yield strengths of the newly designed Ti-MEAs were systematically investigated, providing important insights for further designing Ti-MEAs.
JOURNAL OF ALLOYS AND COMPOUNDS
(2023)
Article
Materials Science, Multidisciplinary
Farahnaz Haftlang, Jae Bok Seol, Alireza Zargaran, Jongun Moon, Hyoung Seop Kim
Summary: Maraging structural materials have been used for centuries, but their low ductility has limited their application. In this study, a dual-phase medium-entropy Fe68Ni10Mn10Co10Ti1.5Si0.5 maraging alloy with high strength (1.6 GPa) and enhanced ductility (-25%) is developed by injecting metastable austenite into the microstructure. The combination of metastability and heterogeneity achieved through heat treatment techniques can provide a breakthrough in developing maraging materials with large ductility.
Article
Materials Science, Multidisciplinary
Tae Jin Jang, You Na Lee, Yuji Ikeda, Fritz Koermann, Ju-Hyun Baek, Hyeon-Seok Do, Yeon Taek Choi, Hojun Gwon, Jin-Yoo Suh, Hyoung Seop Kim, Byeong-Joo Lee, Alireza Zargaran, Seok Su Sohn
Summary: Complex concentrated alloys (CCAs) with a face-centered-cubic (FCC) structure can improve both strength and ductility by adding the refractory element Mo to the alloy, resulting in enhanced solid-solution strengthening and reduced stacking fault energy (SFE).
Article
Materials Science, Multidisciplinary
Jeong Ah Lee, Jihye Kwon, Gihyeok Kwon, Soon Jik Hong, Hyoung Seop Kim
Summary: This study investigates the mechanical behavior of aluminum chip compaction using a new computational simulation approach. Two material parameters are proposed and adjusted for different swarf, and the numerical results show good agreement with experimental data. The study can be applied for further investigation and analysis of metal swarf of different geometries in various industrial applications.
ADVANCED ENGINEERING MATERIALS
(2023)
Article
Chemistry, Physical
Selim Kim, Dong Geun Kim, Minu Kim, Ki Jong Kim, Jae Min Lee, Joon Hyuk Lee, Hae-Won Cheong, Hyoung Seop Kim, Sunghak Lee
Summary: Various Al foams have been developed to meet the increasing demands for impact reduction in military, automotive, civil-engineering, and aerospace applications. Evaluating their energy-absorbing performance is challenging due to the rapid closure of interior pores. This study modified a split Hopkinson pressure bar (SHPB) to reliably evaluate the energy-absorbing performance of open- and closed-cell Al foams using the incident wave alone.
JOURNAL OF ALLOYS AND COMPOUNDS
(2023)
Article
Chemistry, Physical
Soung Yeoul Ahn, Farahnaz Haftlang, Eun Seong Kim, Do Won Lee, Hyoung Seop Kim
Summary: In this study, a metastable Fe-15Ni-8Mn-8Co-3Ti-1Si ferrous medium entropy alloy is subjected to powder high-pressure torsion (HPT) followed by annealing. The microstructure changes from a body-centered cubic phase to a metastable face-centered cubic phase decorated with Ti-Si-rich precipitates during the isothermal post-annealing process. The optimized heat treatment leads to materials with high ultimate tensile strength and total elongation.
JOURNAL OF ALLOYS AND COMPOUNDS
(2023)
Article
Chemistry, Physical
Jungwan Lee, Hyojin Park, Sujung Son, Takayoshi Nakano, Hyoung Seop Kim
Summary: Heterostructuring is used to improve the mechanical performance of metallic materials. This study introduces "dynamic heterostructuring" through hot rolling, which is different from the traditional "static heterostructuring" by cold rolling and annealing. The dynamic recrystallization during hot rolling enhances strain hardening and increases the yield strength of the alloy.
JOURNAL OF ALLOYS AND COMPOUNDS
(2023)
Article
Nanoscience & Nanotechnology
Rae Eon Kim, Sang Guk Jeong, Hyojeong Ha, Do Won Lee, Auezhan Amanov, Hyoung Seop Kim
Summary: Metal additive manufacturing (MAM) is capable of designing complex geometries with optimized and near-net-shaped structures. However, defects generated during the manufacturing process have limited its industrial applications. This study proposes a new strategy using ultrasonic nanocrystal surface modification (UNSM) to reduce defects and improve the mechanical properties of MAM parts.
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
(2023)
Article
Nanoscience & Nanotechnology
M. M. Jafarzad-Shayan, A. Zarei-Hanzaki, A. Moshiri, H. Seop Kim, F. Haftlang, M. Tahaghoghi, M. Mahmoudi, M. Momeni, H. R. Abedi
Summary: Wire arc additive manufacturing (WAAM) is a cost-effective industrial-scale additive manufacturing technique that utilizes electric arc as energy source and metal wire as feedstock. In this study, the superior room temperature mechanical properties of AISI 316L stainless steel fabricated using WAAM were investigated. The extracted specimens from the printed part exhibited higher yield strength (450 MPa ± 20 MPa) and uniform elongation (41.2% ± 2.5%) compared to conventionally manufactured counterparts. Microstructural and elemental analyses revealed a non-equilibrium microstructure categorized as dual-phase, periodic layered, and harmonic hetero-structured materials. The hetero-deformation induced (HDI) strengthening was determined to contribute to 61.3% ± 2.2% of the overall strength through loading-unloading reloading test.
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
(2023)
Review
Materials Science, Multidisciplinary
Wenyi Huo, Shiqi Wang, F. Javier Dominguez-Gutierrez, Kai Ren, Lukasz Kurpaska, Feng Fang, Stefanos Papanikolaou, Hyoung Seop Kim, Jianqing Jiang
Summary: This paper reviews recent developments in atomistic simulations of high-entropy electrocatalysts, which are considered as emerging state-of-the-art catalytic materials. The paper first surveys various modeling methods based on density functional theory and then reviews the progress in simulating different high-entropy electrocatalysts. Finally, prospects in this field are presented.
MATERIALS RESEARCH LETTERS
(2023)
Article
Materials Science, Multidisciplinary
Mohammad Reza Akbarpour, Homayoun Mousa Mirabad, Farid Gazani, Iman Khezri, Amirhossein Ahmadi Chadegani, Ali Moeini, Hyoung Seop Kim
Summary: This article discusses the manufacturing methods and microstructural characteristics of Cu-SiC metal matrix composites to explore their potential for thermal management applications.
JOURNAL OF MATERIALS RESEARCH AND TECHNOLOGY-JMR&T
(2023)
Article
Engineering, Manufacturing
Anatoliy Zavdoveev, Andrey Klapatyuk, Thierry Baudin, Eric MacDonald, Dhanesh Mohan, J. P. Oliveira, Alex Gajvoronskiy, Valeriy Poznyakov, Hyoung Seop Kim, Francois Brisset, Maksym Khokhlov, Mark Heaton, Massimo Rogante, Mykola Skoryk, Dmitry Vedel, Roman Kozin, Illya Klochkov, Sviatoslav Motrunich
Summary: This study proposes the wire arc additive manufacturing method for non-equimolar Co-Cr-Fe-Mn-Ni high-entropy alloy using gas metal arc welding (GMAW) with metal powder-cored wire (MPCW). The filler powder contains Co-Cr-Mn-Ni components in equal atomic amounts relative to each other with Fe metal stripe as a shield. This method allows for building high-entropy alloy samples with desired characteristics. It outperforms alternative methods such as vacuum melting, plasma arc melting, selective laser melting, or electron beam melting in multiple indicators.
ADDITIVE MANUFACTURING LETTERS
(2023)
Article
Materials Science, Multidisciplinary
Gang Hee Gu, Shin-Yeong Lee, Min Hong Seo, Jae-il Jang, Hyoung Seop Kim
Summary: The heterogeneous strengthening behavior in shear deformation was experimentally characterized and numerically modeled in this study. The results showed that the layered sheet exhibited better mechanical performance in both tensile and shear deformations, demonstrating the heterogeneous strengthening effect in shear deformation. The numerical simulations using microstructure-based constitutive models were in good agreement with experimental results, indicating the applicability of these models in shear stress state as well as uniaxial tension state.
METALS AND MATERIALS INTERNATIONAL
(2023)
Review
Materials Science, Multidisciplinary
Mohammad Reza Akbarpour, Farid Gazani, Homayoun Mousa Mirabad, Iman Khezri, Ali Moeini, Nafiseh Sohrabi, Hyoung Seop Kim
Summary: Cu-SiC composites have high thermal and electrical conductivity, mechanical strength, moldability, and low production cost. This review summarizes the scientific research on processing, effective parameters, and strategies to modify the Cu-SiC interface, covering microstructural, mechanical, tribological, thermal, and electrical properties of Cu-SiC composites.
PROGRESS IN MATERIALS SCIENCE
(2023)