Article
Materials Science, Multidisciplinary
Olli Nousiainen, Jaakko Hannula, Sami Saukko, Antti Kaijalainen, Jukka Komi
Summary: The precipitation behavior of nanosized carbides in low-alloy Ti-Mo-V-Nb and Ti-Mo-V- steels was investigated during isothermal dwell at different temperatures. The formation and orientation of interphase precipitates (IP) in the ferrite matrix depended on steel chemistry, temperature, and dwelling time. Finely dispersed interphase precipitated V(Mo)C carbides formed rows with increased spacing and size during isothermal dwell, while spherical V(Mo)C carbides formed within the supersaturated ferrite matrix. For Ti-Mo-V steel, interphase precipitated Ti (Mo,V)C carbides only formed at the highest dwell temperature of 680 degrees C.
MATERIALS CHARACTERIZATION
(2023)
Article
Chemistry, Multidisciplinary
Yongjian Xu, Minlan Gao, Yongqi Zhang, Lulu Ning, Deqing Zhao, Yonghao Ni
Summary: Cellulose nanomaterials have attracted significant attention in material research due to their unique properties and sustainable nature. In this study, hollow-type annular cellulose nanocrystals (HTA-CNCs) were synthesized through high-intensity ultrasonic treatment. Experimental and molecular dynamics simulation results showed the structural and property changes of HTA-CNCs, indicating their potential value as cellulose nanomaterials in various fields.
Article
Chemistry, Physical
Zonglin Li, Mingxin Xie, Guozheng Nie, Junhui Wang, Lujun Huang
Summary: In this study, we developed an optical biosensor based on an all-dielectric metasurface with broken symmetry. The biosensor exhibited excellent performance, thanks to the high-Q quasi-bound states in the continuum (qBICs) and the efficient field confinement. It has potential applications in extreme biochemical sensing, such as COVID-19 detection at ultralow concentrations.
JOURNAL OF PHYSICAL CHEMISTRY LETTERS
(2023)
Article
Chemistry, Physical
Annick De Backer, Zezhong Zhang, Karel H. W. van den Bos, Eva Bladt, Ana Sanchez-Iglesias, Luis M. Liz-Marzan, Peter D. Nellist, Sara Bals, Sandra Van Aert
Summary: The methodology combines energy dispersive X-ray spectroscopy (EDX) and high angle annular dark field scanning transmission electron microscopy (HAADF STEM) to count the number of atoms in multimetallic nanocrystals, allowing extraction of 3D structural information at the atomic scale.
Article
Materials Science, Multidisciplinary
Tian-Xing Yang, Zhan-Xing Li, Chang-Jun Zhou, Yi-Chun Xu, Peng Dou
Summary: FeCrAl oxide dispersion strengthened (ODS) steel is a promising cladding material for Generation IV nuclear reactors due to its superior properties. The morphologies, crystal structures, and metal/oxide interface structures of two FeCrAl ODS steels were studied. The dispersion morphology of oxides in the 3.7Al-0.1Ti-0.6Zr ODS steel was found to be better than that of the 3.3Al-0.5Zr ODS steel. The proportions of different oxides in the two ODS steels were characterized. The mechanisms of oxide formation, polymorphic transition, and strengthening in the ODS steels were discussed.
JOURNAL OF NUCLEAR MATERIALS
(2023)
Article
Nanoscience & Nanotechnology
Feng-Hui Gong, Yu-Ting Chen, Yin-Lian Zhu, Yun-Long Tang, Heng Zhang, Yu-Jia Wang, Bo Wu, Jia-Qi Liu, Tong-Tong Shi, Li-Xin Yang, Chang-Ji Li, Yan-Peng Feng, Xiu-Liang Ma
Summary: This work investigates the domain evolution and topological properties of ultrathin PbTiO3 (PTO) films using Cs-corrected scanning transmission electron microscopy (STEM), reciprocal space mapping (RSM), and piezoresponse force microscopy (PFM). It is found that when the thickness of PTO films is less than 6 nm, there is a coexistence of a/c domains and bowl-like topological structures, identified as convergent and divergent types of meron. Abundant 90 degrees charged domain walls are also identified. PFM studies confirm the ferroelectric properties of these ultrathin PTO films.
ACS APPLIED MATERIALS & INTERFACES
(2022)
Article
Nanoscience & Nanotechnology
Hao Luo, Dongwang Yang, Yimeng Yu, Qi Liang, Haoyang Peng, Fanjie Xia, Xinfeng Tang, Jinsong Wu
Summary: Through high-pressure processing, the thermoelectric performance of Cu2S is significantly improved due to the dynamic phase and defect structure evolutions formed by its complex phase and microstructure under high pressure. The HPRT Cu2S has a low lattice thermal conductivity and a high ZT value in the temperature range of 600-900 K.
ADVANCED ELECTRONIC MATERIALS
(2022)
Review
Materials Science, Multidisciplinary
Xi Jiang, Nitash P. Balsara
Summary: Electron microscopy has been essential in characterizing polymers, with recent developments allowing for atomic resolution imaging of polymer crystals and providing a comprehensive understanding of strategies towards high-resolution imaging of radiation-sensitive polymer materials at different length scales.
ACS APPLIED POLYMER MATERIALS
(2021)
Article
Microscopy
Johannes Berlin, Tobias Stegmueller, Ferdinand Haider
Summary: It has been known for a long time that the first metastable precipitates in Al-Cu alloys, called Guinier-Preston zones (GPZ), are platelets of Cu on {100} planes with a thickness of only one atomic layer. Until now, the direct observation and imaging of these platelets have only been possible in edge views using aberration corrected transmission electron microscopes (TEM). However, our study shows that under suitable conditions, plan-view observations are possible, providing further insight into the shape and arrangement of the GP zones. Furthermore, we have demonstrated the ability to detect single Cu atoms within a column of Al atoms.
Article
Chemistry, Physical
Jin-Hu Dou, Maxx Q. Arguilla, Yi Luo, Jian Li, Weizhe Zhang, Lei Sun, Jenna L. Mancuso, Luming Yang, Tianyang Chen, Lucas R. Parent, Grigorii Skorupskii, Nicole J. Libretto, Chenyue Sun, Min Chieh Yang, Phat Vinh Dip, Edward J. Brignole, Jeffrey T. Miller, Jing Kong, Christopher H. Hendon, Junliang Sun, Mircea Dinca
Summary: Researchers have successfully grown single crystals of 2D metal-organic frameworks up to 200 µm in size by balancing in-plane and out-of-plane interactions, revealing anisotropic transport and a clear correlation between conductivity and the nature of the metal cation in the sheets.
Article
Chemistry, Multidisciplinary
R. Podor, V Trillaud, G. I. Nkou Bouala, N. Dacheux, C. Ricolleau, N. Clavier
Summary: This study utilized two-grain model systems formed by ThO2 nanospheres to experimentally investigate the initial stage of sintering from room temperature to 1050 degrees C. The research revealed that at high temperatures, crystallites underwent reorganization and growth through oriented attachment, leading to the formation of a single crystal. The formation of the neck during sintering was predominantly driven by volume diffusion.
Article
Geochemistry & Geophysics
R. Gerrits, R. Wirth, A. Schreiber, I Feldmann, N. Knabe, J. Schott, L. G. Benning, A. A. Gorbushina
Summary: Many microorganisms, including fungi, weather minerals through the formation of biofilms on their surfaces. Experimental results suggest that the specific traits of fungal biofilms have minimal impact on mineral weathering.
Article
Chemistry, Physical
Nadine Eissmann, Uwe Muehle, Uwe Gaitzsch, Gunnar Walther, Thomas Weissgaerber, Bernd Kieback
Summary: The effect of titanium addition beyond the solubility limit was investigated to demonstrate the precipitation hardening possibility of the Cantor alloy CoCrFeMnNi. Following appropriate heat treatment, a significant increase in hardness was detected due to nanometer-sized precipitates identified through TEM analysis.
JOURNAL OF ALLOYS AND COMPOUNDS
(2021)
Article
Physics, Multidisciplinary
I. C. Lin, M. H. Lee, P. C. Wu, S. C. Lin, J. W. Chen, C-C Li, G. Y. Guo, Y-H Chu, R. Sankar, M-W Chu
Summary: Thin oxide films offer vast opportunities for modern electronics, and this study demonstrates the twisting of metallic phases into distinct charge-lattice entangled states by epitaxial strains. The research reveals lattice instabilities and localized hole doping in LaNiO3, PrNiO3, and NdNiO3 films on SrTiO3. These findings indicate the existence of hidden orders in versatile oxide heterostructures with unexpected properties.
NEW JOURNAL OF PHYSICS
(2022)
Article
Materials Science, Multidisciplinary
Y. Ikeda, R. Yuan, A. Chakraborty, H. Ghassemi-Armaki, J. M. Zuo, R. Maass
Summary: The study revealed the presence of nano-scale intermetallic phase G-phase in uncracked grain boundaries, suggesting it as one of the primary nanoscopic drivers for grain-boundary weakening and crack initiation. These findings shift the focus of LME research to the very early stages immediately following Zn diffusion, where secondary phase nucleation and growth emerge as the root-cause for failure.
MATERIALS TODAY ADVANCES
(2022)
