RSC Advances
·
2023
·Vol. 13
·期 26
·17834-17841
·
IF 3.9
Ruihao Wang,Lanting Yang,Zhenwei Zhang,Wenkui Song,Dunju Wang,Changping Guo
Composite explosives with fast reaction rate, high energy release efficiency, and remarkable combustion performance can be obtained by the interaction between homogeneous energetic materials and heterogeneous energetic materials and have broad application prospects. However, ordinary physical mixtures can easily cause separation between the components in the preparation process, which is not conducive to reflecting the advantages of composite materials. In this study, high-energy composite structured explosives with RDX modified by polydopamine as the core and PTFE/Al as the shell were prepared using a simple ultrasonic method. The study of morphology, thermal decomposition, heat release, and combustion performance demonstrated that the quasi-core/shell structured samples have higher exothermic energy, faster combustion rate, more stable combustion characteristics, and lower mechanical sensitivity than the physical mixture.
研究领域:
材料科学
·
燃烧与爆炸学
✓ 已验证
DOI
PubMed
高影响因子
JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS
·
2025
·Vol. 36
·期 19
·1-11
·
IF 2.8
Li Canglong,Wen Kexin,Zhang Bing,Chen Jie,Niu Xinshuai,Zou Boyuan,Lu Xuechi,Yang Wenqian
The structure, magnetic behavior and magnetocaloric performance in heavy rare–earth based compounds Tb 2 M TiO 6 ( M = Co, Ni, Cu) have been experimentally investigated in this work. The structural analysis indicates that Tb 2 CoTiO 6 and Tb 2 NiTiO 6 crystallize in a monoclinic double perovskite structure, while Tb 2 CuTiO 6 forms a hexagonal layered structure. The magnetic measurements reveal that the samples show high magnetic reversibility within a wide temperature range. The high-temperature Curie–Weiss fitting suggests that the antiferromagnetic coupling between RE 3+ and RE 3+ is dominant at low temperatures. The Arrott-plots imply that the magnetic transition in Tb 2 M TiO 6 is of second–order nature according to the Banerjee’s criteria. The magnetic entropy change − Δ S M is evaluated to be 10.7, 16.2 and 13.2 J kg −1 K −1 for Tb 2 CoTiO 6 , Tb 2 NiTiO 6 and Tb 2 CuTiO 6 at 4 K and magnetic field change Δ H = 6 T, respectively. The work suggests that the lack of 3 d –3 d coupling in the design of double perovskites is one of the potential approaches for developing low-temperature magnetic refrigeration materials.
研究领域:
材料科学
·
固体物理
·
磁学
·
低温制冷材料
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF MATERIALS SCIENCE
·
2023
·Vol. 58
·期 36
·14440-14451
·
IF 4.5
Zhou Yuncheng,Xu Yuxing,Feng Hailan,Song Jiechen,Yan Mengxiao,Jian Haoyu,Zhuge Fuchang,Tan Qiangqiang
The Li-excess disordered rock salt cathode material, Li 1.2 Ni 0.2 Ti 0.6 O 2 , was synthesized via the sol–gel method to investigate the impact of different sintering temperatures on its structure, morphology, and electrochemical performance. X-ray diffraction (XRD) analysis revealed a cubic rock salt structure for the material. Raman spectroscopy indicated the presence of short-range-ordered domains of Li 2 TiO 3 and LiNiO 2 in the samples. The XPS results confirmed the existence of an oxygen vacancy structure on the sample’s surface. Morphological observations demonstrated that micron-scale secondary particles agglomerated with nanoscale primary particles, resulting in a nano-microstructure formation. Electrochemical testing conducted at room temperature within a voltage range of 1.5 ~ 4.8 V showed that the sample sintered at 600 °C exhibited the highest specific discharge capacity of approximately 304.4 mAh g −1 at 20 mA g −1 . The influence of surface structure on electrochemical properties in disordered rock salt cathode materials is elucidated through interactions between small primary particles and surface oxygen vacancies.
研究领域:
材料科学
·
电化学
·
无机化学
·
能源存储
·
固体化学
✓ 已验证
DOI
高影响因子
RARE METALS
·
2025
·
IF 11
Dong Bo-Long,Li Hao-Song,Dong Chuan-Qi,Li Xiang-Ji,Zhu Yi-Chen,Fang Yi,Fu Bi-Cheng,Jung Seung-Boo,Zhu Wen-Bo,Li Ming-Yu
Silver paste is widely used in power electronics as a die-attach material owing to its low-temperature sinterability, high melting point, and excellent electrical and thermal conductivities in sintered joints. However, owing to the mismatch in the coefficient of thermal expansion (CTE) between the joints and chip, the high Young’s modulus of sintered silver hinders the mitigation of the high thermal stress generated during the operation of power modules, which increases the susceptibility of sintered joints to cracking, thereby leading to potential failure. This study developed a facile approach to synthesizing bayberry-like Ag microparticles (AgMPs) through the in situ assembly of silver nanorods, resulting in a uniform distribution of nanoscale structures and mesopores on the particle surface. These particles exhibited a high specific surface area of 2.5389 m 2 ·g −1 , which enhanced their sintering activity, enabling sintering to occur at 149.7 °C. Furthermore, the porous structure of the AgMPs effectively reduced the density of joints formed by sintering AgMP paste, thereby lowering the Young’s modulus of the joints. The small grain size and intricate internal substructure of the joints yielded high shear strength, which reached 112.50 MPa at 250 °C. The Young’s modulus could be adjusted, and the pores provided by the AgMPs maintained the Young’s modulus within a low range (15.11–29.61 GPa), effectively mitigating thermal stress. These new bayberry-like porous AgMPs offer a promising option for die-attach materials in electronic packaging. Graphical abstract
研究领域:
材料科学
·
电子封装技术
✓ 已验证
产品关联
DOI
高影响因子
BIOCHEMICAL AND BIOPHYSICAL RESEARCH COMMUNICATIONS
·
2018
·
IF 2.559
Peihai Li,Kun Zang,Yingjie Li,Changshui Liu,Qingjun Ma
Extracellular proteases are often produced as pre-pro-enzyme and then undergo multiple processing steps to mature into the active form. The protease Epp, a virulent factor of Vibrio anguillarum , belongs to this family. Its maturation might be regulated by Ca 2+ via its polycystic kidney disease (PKD) domain, but the molecular mechanism is unknown. Herein, we report the crystal structure of the first PKD domain from V. anguillarum Epp (Epp-PKD1) and its specific Ca 2+ -binding capacity. Epp-PKD1 exists as a monomer , consisting of seven β-strands which form two β-sheets stacking with each other. One Ca 2+ is bound by the residues Asn3, Gln4, Asp27, Asp29, Asp68 and a water molecule with a pentagonal bipyramidal geometry. Incubating the apo Epp-PKD1 with Ca 2+ but not Mg 2+ , Mn 2+ , or Zn 2+ , enhances the thermal and chemical stability of Epp-PKD1, indicating its specific binding to Ca 2+ . Epp-PKD1 shares high similarity in both sequence and overall structure with that of Vibrio cholerae PrtV, a homologous protease of Epp, however, they differ in the oligomeric state and local structure at the Ca 2+ -binding site, suggesting maturation of PrtV and Epp might be differently regulated by Ca 2+ . Likely, proteases may take advantage of the structural diversity in PKD domains to tune their Ca 2+ -regulated maturation process.
研究领域:
生物化学
·
结构生物学
·
微生物学
✓ 已验证
DOI
高影响因子
JOURNAL OF THE AMERICAN CERAMIC SOCIETY
·
2020
·Vol. 103
·期 11
·6586-6593
·
IF 3.502
Zhilong Fu,Yafei Liu,Bo Zhang,Aimin Chang
The cold sintering process (CSP) has been used for fabricating functional ceramics at a low sintering temperature. In this study, highly dense 0.3CaCeNbWO 8 -0.7LaMnO 3 composite ceramics have been successfully fabricated by CSP. The phase structure, microstructure, and electrical properties of composite ceramics have been investigated. The composite ceramic is mainly composed of a tetragonal CaCeNbWO 8 phase with scheelite structure and an orthorhombic LaMnO 3 phase with perovskite structure. The relative density of composite ceramic is 94.5%, and is higher than that of single phase ceramic. The resistivity of composite ceramic exhibits negative temperature coefficient characteristics, with an aging coefficient less than 2%. Such a sintering methodology is of great significance, since it provides a feasible idea for preparing composite ceramics.
研究领域:
材料科学
·
电子工程
✓ 已验证
DOI
高影响因子
Journal of Physical Chemistry C
·
2020
·
IF 4.189
Yeming Xian,Yongli Zhang,Naveed Ur Rahman,Hang Yin,Yi Long,Peng Liu,Wenzhe Li,Jiandong Fan
Owing to the high toxicity of Pb-based hybrid perovskites, a hypotoxic element, e.g., Sn, was employed to partially or completely replace Pb with the aim of gaining environmentally friendly lead-free photoelectronic device. Herein, for the first time we hydrothermally grow a series of all-inorganic CsSnxPb1–xBr3 (0 ≤ x ≤ 1) perovskite single crystals and carefully study their crystallographic structure and electronic structure that are subject to the varied x value. The phase transition and narrowed band gap from CsPbBr3 to CsSnBr3 are observed, which is similar to the evolution of MASnxPb1–xBr3 perovskites while varying the ratio of Sn/Pb. Likewise, the incremental concentration of Sn atoms in the lattice tend to cause the energy level splitting that likely derives from the orbital overlapping between Sn and/or Pb atoms, which thereby gives rise to the narrowed band gap. Equally important is that the incorporation of Sn atoms is demonstrated to be capable of tightening the electron orbital coupling between Sn and/or Pb atoms, which thereafter enables advantageous balancing of the orbital overlap in the crystal structure with balanced and highly ordered arrangement of [SnBr6]4– and/or [PbBr6]4– octahedra and thus allows us to improve carrier transport and to benefit the real ecofriendly application of photoelectronic devices.
研究领域:
材料科学
·
物理化学
✓ 已验证
DOI
高影响因子
Journal of Environmental Sciences
·
2022
·
IF 6.796
Rui Liu,Huan-Huan Yang,Hao Zhou,Xianliang Yi,Yang Liu
Particulate matter (PM) is the main contributor to air pollution, and filtration has been reported to be promising for PM capturing. Considering the complexity of polluted air (volatile organic compounds (VOCs) and ozone are likely concomitant with PM particles) and in view of the versatility of MnO 2 for the degradation of VOCs and ozone, the feasibility of MnO 2 materials as PM filtering media was investigated in this study, and the effect of crystal structure on PM filtration was clarified. Compared with the layered δ-MnO 2 , the MnO 2 with tunnel structure (including 1 × 2-, 2 × 2- and 3 × 3-MnO 2 ) exhibited greatly enhanced PM removal efficiencies, and particularly, the 3 × 3-MnO 2 possessed not only significant activity for adsorbing PM particles but also high utilization efficiency of the active surface. Physicochemical properties of the adsorbents were studied by XRD, ATR, isothermal N 2 adsorption, SEM and (HR)TEM. The correlation between pore characteristics and particle elimination activity demonstrates that the most developed mesoporous structure of the 3 × 3-MnO 2 sample played an important role in strengthening the PM adsorption capability. Further comparison of the surface properties of the fresh and spent samples reveals that with respective to the occasion of δ-MnO 2 , the structure of 3 × 3-MnO 2 was robust enough to resist collapse after PM capturing and the great accommodation of the inorganic and organic PM substances in the voluminous pores induced strong affinity between PM particles and 3 × 3-MnO 2 . Thereby, a higher particle filtration ability was retained.
研究领域:
环境科学
·
材料科学
✓ 已验证
DOI
PubMed
高影响因子
ACS Nano
·
2020
·
IF 14.588
Jiajia Ning,Zonghui Duan,Stephen V. Kershaw,Andrey L. Rogach
Synthetic routes to deposit CuInS2 (CIS) shells with either a cubic chalcopyrite (CP) or a hexagonal wurtzite (WZ) phase on trigonal pyramidal-shaped CuInSe2 (CISe) core nanocrystals (NCs) with a cubic CP crystal structure have been developed and governed by tuning the amount of the sulfur precursor tert-dodecanethiol. During the synthesis of CP-CIS/CP-CISe core/shell NCs, the CP-CIS shell initially starts to grow epitaxially in a uniform way, while the further addition of the CIS precursor induces islandlike growth, and finally a branched CIS shell is formed. In a stark contrast, when a WZ-CIS shell is deposited, it initially grows on a portion of each of the facets of the trigonal pyramidal-shaped CISe cores to form a monolayer, which then continues to increase in thickness and forms a multilayered WZ-CIS shell. Both CP-CISe/CP-CIS core/shell NCs and CP-CISe/WZ-CISe core/shell NCs exhibit rather low photoluminescence quantum yields (<10%), even with a smaller-sized CISe core, which calls for further refinements of the shell growth methods. Synthetic methods for the growth of CIS shells as described here allow for direct deposition of cadmium-free ternary compounds as shell materials and provide important insights into the different modes of growth of heterostructured NCs, ranging from epitaxial to island- and branched-like, as well to the facet-specific multilayer deposition.
研究领域:
材料科学
·
纳米技术
·
化学合成
✓ 已验证
产品关联
DOI
PubMed
高影响因子
Materials Futures
·
2024
·Vol. 3
·期 2
·025001
·
IF 12
Junfeng Xiao,Mengxing Zhang,Fei Zhai,Hongrui Wei,Sen Liu,Peng Wang,Zhiyang Liu,Zhongying Ji,Xiaolong Wang
Three-dimensional (3D) printing allows for the creation of complex, layered structures with precise micro and macro architectures that are not achievable through traditional methods. By designing 3D structures with geometric precision, it is possible to achieve selective regulation of mechanical properties, enabling efficient dissipation of mechanical energy. In this study, a series of modular samples inspired by the Bouligand structure were designed and produced using a direct ink writing system, along with a classical printable polydimethylsiloxane ink. By altering the angles of filaments in adjacent layers (from 30° to 90°) and the filament spacing during printing (from 0.8 mm to 2.4 mm), the mechanical properties of these modular samples can be adjusted. Compression mechanical testing revealed that the 3D printed modular Bouligand structures exhibit stress-strain responses that enable multiple adjustments of the elastic modulus from 0.06 MPa to over 0.8 MPa. The mechanical properties were adjusted more than 10 times in printed samples prepared using uniform materials. The gradient control mechanism of mechanical properties during this process was analyzed using finite element analysis. Finally, 3D printed customized modular Bouligand structures can be assembled to create an array with Bouligand structures displaying various orientations and interlayer details tailored to specific requirements. By decomposing the original Bouligand structure and then assembling the modular samples into a specialized array, this research aims to provide parameters for achieving gradient energy absorption structures through modular 3D printing.
研究领域:
材料科学
·
力学工程
✓ 已验证
产品关联
DOI
高影响因子
CARBOHYDRATE POLYMERS
·
2020
·
IF 7.182
Qiuqin Lin,Yuxiang Huang,Wenji Yu
In this study, two methods including a common method using high concentration of alkali solution and a mild extraction method at ambient conditions were used to extract cellulose from bamboo. The results showed that two methods affected the initial state of the cellulose. Celluloses obtained by the former was a hybrid of cellulose I and II while the latter was pure cellulose I. However, their heat treatment results indicated that the heat treatment (≤200 °C) would not change the aggregation structure of bamboo cellulose, but it will cause the change of intramolecular and intermolecular hydrogen bonds, and the break of glycosidic bonds in the amorphous region and part of the crystalline region of cellulose. Accordingly, the crystallinity of bamboo cellulose will decrease slightly after heat treatment. Finally, the macroscopic morphology change of bamboo cellulose caused by heat treatment was the thermal expansion in the width direction instead of distort.
研究领域:
材料科学
·
植物学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
·
2021
·
IF 5.316
Xiaoyang Wang,Jianguo Huang,Hao Feng,Jinfeng Li,Zidie Pu,Xiangchun Yin
The hierarchical architecture constitutes one of the key factors affecting the performance of microwave absorbing materials (MAMs). Herein, core-shell Fe 3 O 4 with a dendritic hierarchical structure is fabricated successfully by the melting method in a SiO 2 -B 2 O 3 -Al 2 O 3 -CaO-Fe 2 O 3 multi-component system. The multiple transmission scattering absorption mechanism is mediated by the unique microstructure, thus improving the impedance matching and the microwave loss ability of the material. According to its reflection loss curve, the microwave absorption was efficiently optimized, yielding a minimum reflection loss (R L ) of − 54.26 dB when the thickness was 3.47 mm, and the effective bandwidth (R L <10 dB) for electromagnetic wave reflectance reached 3.28 GHz (6.48–9.76 GHz) with a sample thickness of 1.8 mm. The present work adds new useful information for the designing of high-performance glass-ceramic MAMs.
研究领域:
材料科学
·
电磁学
✓ 已验证
产品关联
DOI
高影响因子
危险品化学品经营许可证（带存储）