Article
Engineering, Chemical
Kenta Komatsu, Tomokatsu Hayakawa, Hiroshi Fudouzi
Summary: In this study, a sandwich structure was formed by bonding two fcc structure colloidal crystal films together using hot pressing, and a clear defect mode was observed. The effect of the thickness of the defect layer in the sandwich structure on the optical properties was investigated.
ADVANCED POWDER TECHNOLOGY
(2022)
Article
Chemistry, Multidisciplinary
Andreas Neophytou, Vinothan N. Manoharan, Dwaipayan Chakrabarti
Summary: Through a computational approach, we address the challenges of design principles, self-assembly pathways, and stability of the photonic band gap. We establish the design principles for the rod-connected diamond structure (RCD) and devise two distinct self-assembly routes, showing how these routes avoid metastable amorphous phases. Finally, we demonstrate that both polymorphs support spectrally overlapping photonic band gaps.
Article
Chemistry, Physical
Huyen T. Pham, Yanting Yin, Gunther Andersson, Klaus J. Weber, The Duong, Jennifer Wong-Leung
Summary: The addition of CsCl/MACl additives has been found to stabilize the cubic FAPbI3 perovskite, leading to a lattice contraction and changes in the optical bandgap. This results in reduced defects, improved photoluminescence yield, and enhanced device performance, with a maximum efficiency of 21.98% measured for the 10 mol% CsCl perovskite layer.
Article
Nanoscience & Nanotechnology
Yanmeng Chen, Tao Guo, Xiaolu Pang, Lijie Qiao
Summary: Stacking faults and twins are difficult to form in ceramic materials. Previous studies overlooked the influence of metal transition layer on film structure and mechanical properties. This research reveals the formation of a large number of stacking faults in the Ti transition layer on (110) MgO substrate, causing high-density stacking faults in nitride ceramic films with high stacking fault energy, thereby increasing the nanoindentation hardness. The presence of stacking faults in the Ti transition layer entering the ceramic films depends on the stacking fault density.
SCRIPTA MATERIALIA
(2022)
Article
Chemistry, Physical
Xiyue Cheng, Yueping Zhang, Lijuan Liu, Xiaoyang Wang, Myung-Hwan Whangbo, Jing Lin, Shuiquan Deng
Summary: By utilizing first-principles calculations and high-throughput crystal structure prediction methods, three energetically favorable structures for SBBO were identified, with the Pm-S structure being the best. Despite this, the Cm structure, with higher symmetry, was also found to be almost equally good in certain aspects. Through atom response theory analysis, the importance of local inversion symmetry in reducing the second-harmonic generation (SHG) response of SBBO was elucidated at the atomic and orbital level.
JOURNAL OF PHYSICAL CHEMISTRY LETTERS
(2021)
Article
Polymer Science
Ami Amano, Toshimitsu Kanai
Summary: We demonstrate the ability to control both the optical stopband wavelength and effective bandwidth of gel-immobilized loosely packed colloidal photonic crystals. By photopolymerizing the gelation reagent of charge-stabilized colloidal crystals under different upper- and bottom-light intensities, we obtain a gel-immobilized film with broadened Bragg reflection peak. Furthermore, by varying the swelling solvent concentration, we can vary the Bragg wavelength over a wide range while maintaining the same broadened effective bandwidth.
Article
Materials Science, Multidisciplinary
Junlong Liao, Changqing Ye, Jie Guo, Carlos Ezio Garciamendez-Mijares, Prajwal Agrawal, Xiao Kuang, Julia Olga Japo, Zixuan Wang, Xuan Mu, Wanlu Li, Terry Ching, Luis Santiago Mille, Cun Zhu, Xingcai Zhang, Zhongze Gu, Yu Shrike Zhang
Summary: A printable CPC ink was developed and used with a 3D printing system to create CPC superstructures with complex structures and structural colors. The performance of the printed objects could be easily adjusted by modifying ink composition and printing parameters. This technology opens up possibilities for applications such as intelligent color displays and 3D integrated sensors.
Article
Materials Science, Multidisciplinary
Junlong Liao, Changqing Ye, Jie Guo, Carlos Ezio Garciamendez-Mijares, Prajwal Agrawal, Xiao Kuang, Julia Olga Japo, Zixuan Wang, Xuan Mu, Wanlu Li, Terry Ching, Luis Santiago Mille, Cun Zhu, Xingcai Zhang, Zhongze Gu, Yu Shrike Zhang
Summary: A printable CPC ink was developed in this study, allowing the fabrication of CPC superstructures with specific geometries and structural colors. This technology enables the creation of CPCs with various desired functions and the mimicry of hierarchical structures and color manipulation strategies found in nature.
Article
Chemistry, Physical
Weibin Li, Chen Zhang, Ding Lan, Wenjie Ji, Zhongyu Zheng, Yuren Wang
Summary: In this work, an ultrafast, robust, and scalable approach of imbibition-induced assembly is introduced, which enables rapid self-assembly of colloidal particles into ordered structures through instantaneous solvent imbibition induced by nanoporous media. Experimental observations show that the nanoporous substrate can induce strong capillary flow and direct the rapid self-assembly of particles, and the imbibition-induced assembly combined with meniscus-guided printing significantly improves the printing speed. The study successfully demonstrates an effective and ultrafast approach for assembling colloidal particles into photonic crystals with controllable sizes and shapes on the macroscale.
JOURNAL OF COLLOID AND INTERFACE SCIENCE
(2022)
Article
Materials Science, Multidisciplinary
M. Gao, T. J. Chen, Z. X. Zhang
Summary: It was found that under 595 degrees Celsius, heating the Ti-A356 mixed powder compact could generate two kinds of TiAlSi intermetallics, tau 1 and tau 2, which are related to the local breakage of oxide films on neighboring Ti and A356 alloy powders. Tau 2 crystals were thinner due to their higher density of stacking faults. During the growth of tau 2 crystals, tau 1 lamellar domains were generated.
JOURNAL OF MATERIALS SCIENCE & TECHNOLOGY
(2021)
Article
Nanoscience & Nanotechnology
Yanmeng Chen, Tao Guo, Jiawei Wang, Xiaolu Pang, Lijie Qiao
Summary: By adjusting the orientation of the entire superlattice films under the same deposition parameters, it was observed that AlN has a thicker coherent thickness in the <110>-oriented TiN/AlN superlattice film, leading to a higher hardness peak value of around 38.6GPa. This work provides a new implementation method to improve the mechanical properties of superlattice films.
SCRIPTA MATERIALIA
(2021)
Article
Materials Science, Multidisciplinary
Yingdong Zhang, Geping Li, Fusen Yuan, Fuzhou Han, Muhammad Ali, Wenbin Guo, Jie Ren, Chengze Liu, Hengfei Gu, Gaihuan Yuan
Summary: The study found that the role of grain boundary migration is crucial in producing stacking faults in nanosized C15 structured ZrFe2 Laves phase precipitate. The interaction between the second phase particle and the grain boundary changes the migration behavior of the grain boundary, leading to the formation of stacking faults in the particle.
JOURNAL OF MATERIALS SCIENCE
(2021)
Article
Materials Science, Multidisciplinary
Yan Liu, Jinshan Li, Bin Tang, William Yi Wang, Minjie Lai, Lei Zhu, Hongchao Kou
Summary: In this study, the formation mechanism of gamma twins in TiAl alloys was analyzed at the atomic scale using HADDF-STEM. The results revealed the process of growth defects in alpha(2)-platelets transforming into the gamma phase, as well as the rearrangement of defects into gamma and gamma(T) platelets during annealing. This provides significant insights for microstructure control and performance improvement in TiAl alloys.
JOURNAL OF MATERIALS SCIENCE & TECHNOLOGY
(2022)
Article
Materials Science, Multidisciplinary
B. Li, Q. Sun, X. Y. Zhang
Summary: PSFs are frequently observed in {1011} and {1012} twins in HCP metals, displacing atoms on every other basal plane without a defined global displacement vector or involvement of dislocation activities. They have limited mobility and the formation mechanism can be extended to other HCP metals.
COMPUTATIONAL MATERIALS SCIENCE
(2021)
Article
Materials Science, Multidisciplinary
Lola Lilensten, Stoichko Antonov, Baptiste Gault, Sammy Tin, Paraskevas Kontis
Summary: This study investigates the differences in creep behavior of polycrystalline Ni-based superalloys with two different Nb contents, attributing the mechanical performance variation to phase transformations along planar faults. The presence of stacking faults and their composition in the alloys are analyzed using electron channeling contrast imaging and atom probe tomography, revealing insights into the underlying mechanisms of creep strain rate differences. The findings suggest a potential atomic-scale driven alloy design approach for enhancing creep resistance by promoting local phase transformations along planar faults at 750 degrees C.
