Article
Polymer Science
Artem Petrov, Vladimir Yu. Rudyak, Alexander Chertovich
Summary: This research reveals the importance of entanglements during fiber production and predicts the optimal proportion between entanglements and chain length for maximizing fiber quality.
Article
Chemistry, Physical
Xin Chen, Markus Mohr, Kai Bruehne, Hans-Joerg Fecht
Summary: The high electrical conductivity of over 100 S/cm was achieved in nanocrystalline diamond films deposited on silicon single-crystalline substrates by using a methane and hydrogen process gas mixture in an appropriate hot-filament CVD process without further dopant. Oxygen reactive-ion etching process was found to improve the diamond film surface's electron affinity, leading to a reduction in specific contact resistance. The mechanism behind the contact resistance reduction was explained qualitatively in terms of the electron affinity of the diamond surface, confirmed through XPS, AFM, and surface wetting measurements.
Article
Polymer Science
Ying Lu, Dong Lyu, Cenhui Han, Yongfeng Men
Summary: Isotactic polypropylene (iPP) can form a transparent structure with aligned fibrillar/micro-fibrillar crystals embedded into an oriented amorphous network at elevated temperatures. Cavitation-induced stress-whitening occurs during further stretching, attributed to the breakage of load-bearing inter-fibrillar/micro-fibrillar tie chains. The critical stress for triggering cavitation is determined by the weight-average molecular weight (M w) rather than the number-average molecular weight or molecular weight distribution (MWD), indicating the importance of long chains in the fibrillar system.
Article
Materials Science, Multidisciplinary
X. Guan, A. Liang, P. S. Branicio
Summary: The molecular dynamics simulations reveal that under high pressure shear loading, nanocrystalline aluminum with 4.5 nm grain size experiences a transient grain refinement regime followed by a steady grain growth process, increasing the average grain size from 4.5 nm to 5.8 nm within 1 ns. The grain growth process is mediated by three independent deformation mechanisms: grain rotation, grain boundary sliding, and grain boundary migration.
COMPUTATIONAL MATERIALS SCIENCE
(2022)
Article
Nanoscience & Nanotechnology
Ting-Chun Lin, Chien-Lung Liang, Shan-Bo Wang, Yung-Sheng Lin, Chin-Li Kao, David Tarng, Kwang-Lung Lin
Summary: The introduction of highly (111)-oriented nanotwinned Cu effectively inhibits detrimental Cu protrusion in TSV technology, reducing protrusion height during thermal annealing and strengthening TSV by impeding dislocation glide. The electrodeposited nanotwinned Cu TSV shows great thermal stability and slight micro-hardness loss under thermal annealing.
SCRIPTA MATERIALIA
(2021)
Article
Nanoscience & Nanotechnology
Vahideh Bayzi Isfahani, Joao Filipe Horta Belo da Silva, Loukya Boddapati, Anabela Gomes Rolo, Rosa Maria Ferreira Baptista, Francis Leonard Deepak, Joao Pedro Esteves de Araujo, Etelvina de Matos Gomes, Bernardo Goncalves Almeida
Summary: This study synthesized highly oriented chromium triiodide (CrI3) magnetic inclusions inside nano/microfibres using the electrospinning technique. The samples exhibited a ferromagnetic-paramagnetic phase transition at 55-56 K and a field-driven metamagnetic transition below 45 K. The anisotropic behavior was attributed to field-induced changes from antiferromagnetic to ferromagnetic alignment along the CrI3 c-axis stacked layers.
Article
Nanoscience & Nanotechnology
Yaqiang Wang, Jiadong Zuo, Kai Wu, Jinyu Zhang, Gang Liu, Jun Sun
Summary: The hardness and strain-rate sensitivity of nano Mo thin films increased with decreasing columnar size due to the confined slip of dislocations in the columnar grains.
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
(2021)
Article
Chemistry, Physical
Ga Hye Kim, Seung-Han Kang, Jong Min Lee, Minki Son, Jiyong Lee, Hyungseok Lee, In Chung, Jaehyun Kim, Yong-Hoon Kim, Kyunghan Ahn, Sung Kyu Park, Myung-Gil Kim
Summary: This study presents the fabrication of high-performance complementary metal oxide-semiconductor (CMOS) circuits using nanocrystalline tellurium (nc-Te) and amorphous-indium gallium zinc oxide (aIGZO) thin-film transistors (TFTs) deposited at room temperature. The use of facile polyethyleneimine (PEI) surface treatment enables high-performance TFTs with good mobility and Ion/Ioff ratio, and the integration of nc-Te and aIGZO TFTs allows the fabrication of various CMOS circuits. The nc-Te on a PEI-treated surface offers a general route to producing stable p-type semiconductors compatible with standard CMOS processing and large-scale on-chip device applications.
APPLIED SURFACE SCIENCE
(2023)
Article
Materials Science, Multidisciplinary
Ke Xu, Weida Huang, Xuefeng Liao, Hongya Yu, Xichun Zhong, Zhongwu Liu
Summary: In this study, a new one-step hot deformation (HD) process was proposed for fabricating NdFeB magnets using amorphous powders. The effects of deformation ratio on the microstructure, magnetic properties, and corrosion resistance were investigated. The results showed that one-step HD process can significantly improve the properties of NdFeB magnets, and the Co element segregation has important effects on the temperature and thermal stability of the magnets.
ADVANCED ENGINEERING MATERIALS
(2023)
Article
Chemistry, Physical
Min Li, Bilin Xu, Linjuan Zheng, Jialiang Zhou, Zhengxin Luo, Wanfei Li, Wujun Ma, Qinghui Mao, Hengxue Xiang, Meifang Zhu
Summary: In this study, a PANI@CNT/PRGO hybrid fiber was designed and fabricated, enabling rapid ion diffusion, fast electron transport, and sufficient utilization of active sites. The strong interfacial interaction between PANI and CNT/PRGO fiber resulted in excellent deformation and cycling stability, while achieving a high volumetric capacitance of 50.2 F cm-3 and outstanding energy density of 6.97 mWh cm-3.
Article
Chemistry, Physical
Jing-Jia Huang, Christian Militzer, Charles Wijayawardhana, Urban Forsberg, Lars Ojamae, Henrik Pedersen
Summary: Highly <111>-oriented 3C-SiC coatings with hexagonally shaped pyramidal crystals were prepared using chemical vapor deposition, with silicon tetrachloride and toluene as the carbon precursors. The growth orientation was explained by the adsorption energy on different crystal planes.
JOURNAL OF PHYSICAL CHEMISTRY C
(2022)
Article
Multidisciplinary Sciences
Mohsen Annabestani, Pouria Esmaeili-Dokht, Ali Olyanasab, Nooshin Orouji, Zeynab Alipour, Mohammad Hossein Sayad, Kimia Rajabi, Barbara Mazzolai, Mehdi Fardmanesh
Summary: This paper proposes a novel 3D microfluidic-oriented gel-based soft sensor that is highly stretchable and can simultaneously measure stretch, twist, and pressure. Unlike previous methods, this sensor uses a low-cost and safe conductive gel instead of EGaIn. The sensor demonstrates linear, accurate, and durable response, and shows potential applications in areas like rehabilitation, wearable devices, soft robotics, and gait analysis.
SCIENTIFIC REPORTS
(2022)
Article
Nanoscience & Nanotechnology
N. N. Liang, R. R. Xu, G. Z. Wu, X. Z. Gao, Y. H. Zhao
Summary: A nanocrystalline high-entropy alloy was produced by high pressure torsion, and the evolution of microhardness and microstructure during subsequent isochronal annealing was studied. The alloy exhibited nano-grains and deformation nano twin lamella, which contributed to its hardness. Annealing below 600°C induced hardening without precipitation effect, while annealing above 600°C resulted in evident recrystallization and grain growth. The high thermal stability of the alloy was attributed to kinetic sluggish diffusion effect and deformation twin boundaries.
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
(2022)
Article
Engineering, Geological
Lei Weng, Haoliang Zhang, Zhijun Wu, Xiangyu Xu, Chongyuan Zhang, Mengyi Li, Quansheng Liu
Summary: Understanding the frost deformation characteristics of rock with varying water contents under freeze-thaw conditions is crucial for construction activities in cold regions. This study found that sandstones exhibit heterogeneous frost deformation behaviors, with higher degrees of saturation leading to more significant heterogeneity. Additionally, parameters such as linear thermal expansion coefficient, maximum frost heave strain, and residual frost heave strain exponentially increase with increasing saturation degree. These findings contribute to the mitigation of freeze-thaw-induced damage in rock mass.
ROCK MECHANICS AND ROCK ENGINEERING
(2023)
Article
Materials Science, Multidisciplinary
Zhangtian Wu, Wei Ji, Jinyong Zhang, Yanan Yuan, Ji Zou, Weimin Wang, Zhengyi Fu
Summary: In this work, dense and grain-refined nanocrystalline (La0.2Nd0.2Sm0.2Gd0.2Eu0.2)2Zr2O7 ceramics were prepared with ultra-high pressure sintering (UHPS) method under 10 GPa at a low temperature of 800°C. The grain size of the prepared ceramic was only 151 nm, which is 40% smaller than that of the raw powder. In addition, it exhibited advantageous properties including both high hardness and aqueous durability.
JOURNAL OF MATERIALS SCIENCE & TECHNOLOGY
(2023)
