MATERIALS & DESIGN
·
2018
·
IF 4.525
Jiaheng Wang,Siu Wing Or,Jun Tan
Core/shell/shell-structured Ni/SiO 2 /polyaniline hexagonal nanoflakes possessing in-plane [111] easy magnetization ( M ) and out-of-plane interfacial polarization ( P ) are synthesized by a three-step liquid chemical method , and their physicochemical properties and growth mechanism are investigated. Three characteristic types of paraffin-bonded ring-shaped nanoflake composites having random (R), vertical–horizontal (V–H), and horizontal–vertical (H–V) orientations of the orthogonal M and P to their two major surfaces are prepared by randomly, vertically, and horizontally aligning the nanoflakes in the paraffin matrix under a magnetic alignment and thermal curing process . The composites are evaluated experimentally and theoretically in the L–Ku (1–18 GHz) bands of microwaves in order to investigate the orientation effect of the orthogonal M and P on their microwave electromagnetic properties . The in-plane M in the H–V-oriented composite and the out-of-plane P in the V–H-oriented composite, which are parallel to the effective magnetic and electric field vectors of incident microwaves, result in a significant enhancement in permeability with multiple magnetic natural resonances and an obvious improvement in permittivity in comparison with other composites, respectively. The observations agree with the theoretical predictions based on the Landau–Lifshitz–Gilbert equation and Bruggeman's effective medium theory for permeability and the Debye's polarization theory for permittivity. As a result, the H–V-oriented composite achieves the best microwave electromagnetic impedance matching and absorption with a broad absorbing bandwidth of 4 GHz, a wide thickness range of 7–10 mm, and a minimal reflection loss of −41.5 dB in the Ku (12–18 GHz) band.
研究领域:
材料科学
·
电磁学
✓ 已验证
DOI
高影响因子
JOURNAL OF MATERIALS SCIENCE
·
2024
·Vol. 59
·期 15
·6354-6364
·
IF 3.5
Zhu Qijing,Zhang Chaoyun,Peng Xiaoling,Li Jing,Wu Qiong,Xu Jingcai,Hong Bo,Wang Xinqing,Ge Hongliang
Amorphous FeSiB/Al 2 O 3 soft magnetic composites were successfully fabricated in this work by applying an external magnetic field perpendicular or parallel to the magnetic toroidal surface, aiming to investigate the influences of magnetic field orientation on their structures and magnetic properties. The results indicate that amorphous FeSiB particles can form chain-like clusters aligned parallel to the direction of the applied magnetic field, which effectively reduces the magnetic reluctance along this direction. The magnetic toroidal with parallel orientation exhibits the highest effective magnetic permeability of 23.8 and a magnetic loss of 43.693 kW/m 3 at 590 kHz and 10mT, which is superior to both the non-oriented and perpendicularly oriented ones due to its optimized microstructure that reduces magnetic reluctance along the working circuit.
研究领域:
材料科学
·
磁学
✓ 已验证
产品关联
DOI
高影响因子
Matter
·
2024
·
IF 17.3
Xuechun Sun,Pengju Shi,Jiahui Shen,Jichuang Shen,Liuwen Tian,Jiazhe Xu,Qingqing Liu,Yuan Tian,Donger Jin,Xiaohe Miao,Jingjing Xue,Rui Wang
Compressive strain is often considered as a key factor in stabilizing formamidinium (FA)-based perovskites. However, the compression along which direction stabilizes perovskite remains unclear due to the presence of non-uniform strain within the material. Here, we introduce a metal encapsulation method to apply compressive strain along the in-plane or out-of-plane direction of perovskite film. According to the grazing-incidence wide-angle X-ray scattering (GIWAXS) results, in-plane compression enhances the stability of perovskites, whereas out-of-plane compression has a detrimental effect. Specifically, out-of-plane compression can lead to the formation of an inactive δ-phase, which compromises the stability of the perovskite. Finally, we develop a general process to integrate in-plane compression into perovskite solar cell (PSC) devices, thereby improving their stability. Our study clarifies the mechanism by which compressive strain affects perovskite stability, offering valuable guidance for strain engineering to optimize perovskite performance.
研究领域:
材料科学
·
光伏技术
✓ 已验证
DOI
高影响因子
CRYSTENGCOMM
·
2022
·Vol. 24
·期 26
·4772-4786
·
IF 3.756
Zhixin Ma,Yang Qi,Xiaoguo Bi,Xu-dong Liu,Xiaodong Li,Ji-guang Li,Xudong Sun
SrTiO3 has high thermoelectric properties and excellent high-temperature stability, which makes it a promising thermoelectric material for use in harsh environments. Hence, it has potential applications in power generation and sensors through direct conversion between heat and electricity. In this study, we investigated the crystal orientations on the crystal growth plane to seek the crystal orientation that is suitable for higher thermoelectric (TE) properties. The [510], [12 5 0] and [320] directions were selected which are on the (001) crystal plane and quarterly divide the angle between the [100] and [110] directions. Two common directions [100] and [110] were selected for comparison purposes. The SrTiO3 single crystals are annealed in carbon powders at 1573 K and 1673 K to form SrTiO3−δ. With the increase in annealing temperature, the electrical conductivity of SrTiO3−δ in the [510], [12 5 0] and [320] directions decreases, which is attributed to the decreasing carrier concentrations. This agrees well with the results calculated using the first-principles calculation. After annealing at 1573 K, the SrTiO3−δ single crystal exhibits the highest ZT value of 0.19 at 873 K in the [510] direction. However, the two common directions, [100] and [110], are not suitable for high thermoelectric properties. In particular, the SrTiO3−δ single crystal in the [12 5 0] direction can always exhibit higher PF and ZT values, regardless of the variation of the annealing temperature in carbon powders. The results of this study are imperative for the design and development of perovskite TE materials.
研究领域:
材料科学
·
热电材料
✓ 已验证
DOI
高影响因子
AUSTRALIAN JOURNAL OF CHEMISTRY
·
2018
·Vol. 71
·期 12
·965-970
·
IF 1.059
Lingfeng Ruan,Rongying Jiang,Jing Liu,Song Liu
BaTiO3/TiO2 and CaTiO3/TiO2 bilayer-type photocatalyst films have been prepared and characterised by X-ray diffraction, Raman, X-ray photoelectron spectroscopy, UV-vis, and scanning electron microscopy techniques. The photodeposition of silver was done to confirm the reduction positions of the titanate/TiO2 films. Silver deposited preferentially on the side of TiO2 for BaTiO3/TiO2 whereas on the side of CaTiO3 for CaTiO3/TiO2. These results imply that the direction of photogenerated electron transfer is coincident with the semiconductor physical principles. Upon exposure to light, electron–hole pairs are generated and subsequently separated by an internal electrostatic field in the titanate–TiO2 heterojunction.
研究领域:
材料科学
·
物理化学
✓ 已验证
产品关联
DOI
高影响因子
Nano Research
·
2018
·Vol. 11
·期 4
·1810-1821
·
IF 7.994
Li Mingtong,Su Yajun,Zhang Hui,Dong Bin
A micropump induces the flow of its surrounding fluids and is extremely promising in a variety of applications such as chemical sensing or mass transportation. However, it is still challenging to manipulate its pumping direction. In this study, we examine a binary micropump based on perovskite and poly[(2-methoxy-5-ethylhexyloxy)-1,4-phenylenevinylene] (MEHPPV). The micropump is operational under the influence of light. Light exhibits significant versatility in controlling the pumping phenomenon of the micropump. It governs the start and stop and also regulates the velocity and directions. The direction control signifies immense opportunities for the development of micropumps with unprecedented pumping behaviors and functions (such as heartbeat-like pumping, rectification, and amplification). This makes them potentially useful in various fields. Hence, it is expected that the micropump reported in the current study could act as a key step towards the further development of more sophisticated micropumps for diverse applications.
研究领域:
材料科学
·
光学工程
·
微流控技术
✓ 已验证
DOI
高影响因子
SCRIPTA MATERIALIA
·
2021
·
IF 5.611
Lei Meng,Chu Xin Peng,Chen He,Fei Yen
The polarity of the magnetic susceptibility χ( T ) of ammonium alum NH 4 Al(SO 4 ) 2 •12H 2 O single crystals below its ferroelectric Curie temperature T C is identified to depend only on the cooling rate. To explain this, we consider reorienting distorted NH 4 + to carry weak magnetic and electric dipole moments that are linearly coupled. Slow cooling allows the dipole moments to align which enhances χ( T ) to become positive. However, due to energy degeneracy of rotational motion and geometric frustration of the NH 4 + , faster cooling rates render the system to become an orientational glass state causing χ( T ) to remain negative. Specific heat measurements also show the presence of excess entropy below a negative anomaly near 53 K. Our findings identify a possible new class of non-equilibrium system with potential applications in non-volatile memory devices.
研究领域:
物理学
·
材料科学
✓ 已验证
产品关联
DOI
高影响因子
China Communications
·
2023
·Vol. 20
·期 10
·292-304
·
IF 4.1
Xiongfei Ren,Lili Tong,Jia Zeng,Chen Zhang
The explosion of ChatGPT is considered to be a milestone in the normalization of artificial intelligence education applications. On the technical line, the cross-modal AI generation application based on human feedback system is accelerated. In the business model, the scenes to realize interactive functions are constantly enriched. This paper reviews the evolution process of AIGC, closely follows the current situation of the coexistence of business acceleration and technical worries in the application of artificial intelligence education, analyzes the application of AIGC education in 7 subdivided fields, and analyzes the optimization direction of application cases from the perspective of perception-cognition-creation technology maturity matrix. The 3 recommendations and 2 follow-up research directions will promote the scientific application of artificial intelligence education in the AIGC period.
研究领域:
人工智能教育
·
应用技术
·
场景分析
·
互联网行业
·
生成式AI
✓ 已验证
DOI
高影响因子
LANGMUIR
·
2025
·
IF 3.9
Jinyue Xiao,Xin Zhang,Zhecun Wang
The Janus membrane demonstrates its advantages in timely drainage and directional water transport properties for efficient fog water collection, which helps alleviate global water shortages. However, the direction-dependent collection and inefficient directional water transport properties limit its widespread application. Herein, a single-layered sandwich-structured copper foam that features a superhydrophilic inner layer and double-deck external hydrophobic layers is prepared by a simple method. This innovative architecture demonstrates direction-independent fog harvesting capabilities through the synergistic integration of symmetric wettability gradients and robust structural integrity. Such sandwiched copper foam shows its superiority in rapid directional water transport and timely drainage properties which can quickly regenerate the fresh outer hydrophobic surface as well as the direction-independent unidirectional water transport properties. The rapid directional water transport property combined with the timely drainage of the sandwiched copper foam benefits the continuous better performance of fog collection compared to that of conventional Janus membranes. Clearly, the development of such sandwiched copper foam with a direction-independent unidirectional water transport property enables the effective and durable collection of fog droplets in environments with dynamically changeable winds. Overall, this work provides a new idea for the fabrication of advanced materials for direction-independent fog collection.
研究领域:
材料科学
·
环境科学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
Journal of Materials Chemistry C
·
2019
·Vol. 7
·期 8
·2299-2304
·
IF 6.641
Yutong Guo,Danchen Wang,Jieai Li,Yunyu Sun,Mingtong Li,Hui Zhang,Ruomeng Duan,Dafeng Zhang,Bo Song,Bin Dong
Micropumps, especially those based on polymers, have shown great potential in sensing and mass transportation applications. However, polymer-based micropumps only exhibit a certain pumping direction, which is not adjustable, thus limiting their further applications. In this paper, a light-driven micropump with tunable pumping directions is reported. The direction control of this micropump relies on the photothermal effect of the polymeric component and the light-induced release of the encapsulated surfactant. Both on–off, inward and outward, or even the unique heartbeat-like pumping behaviors could be realized. The direction-controlled micropump has great potential for a variety of applications. Among others, it has the ability to rectify the fluid flow or accelerate the solution stirring.
研究领域:
材料科学
·
生物医学工程
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS
·
2018
·Vol. 29
·期 7
·5954-5960
·
IF 2.324
Wang Yan,Wang Yishu,Han Jing,Tan Shihai,Guo Fu
Sn grain orientation in solder matrix has recently been considered as one of the principal failure contributions in lead-free solder joints. Since β -Sn exhibits high anisotropy, the differences of electromigration behavior of solder joints with various grain orientations are dramatic. With different angle ( θ ) between the c -axis of Sn grain and the direction of electron flow, the solder joints often demonstrate varying degrees of electromigration-induced damage. The present investigation illustrated significant differences in microstructural features on the surface of Cu reinforced composite solder joints, even with similar angle θ . Two Cu particles reinforced Sn 3.5 Ag composite solder joints with the similar angle θ of 35° and 40° were selected to investigate the effects of Sn grain c -axis on electromigration under high current stressing for 528 h. A large number of Cu 6 Sn 5 compounds were observed and occupied nearly the whole surface with clear polarization effect in one sample. In contrast, very few Cu 6 Sn 5 were found on the surface of the solder matrix in the other sample after current stressing, and the Cu 6 Sn 5 which was formed after reflow disappeared with subsequent current stressing. Even though polarization effect was not obvious, and the cathode interfacial dissolution was observed on such sample. Systematic study revealed that the angle θ alone was not a sole factor to determine the electromigration damage. It has to be considered along with the coordinate system containing the orientation of the c -axis of the Sn grain, a more dominative factor for the diffusing species.
研究领域:
材料科学
·
电子工程
✓ 已验证
产品关联
DOI
高影响因子
COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
·
2022
·
IF 5.518
Muhammad Imran Jamil,Yuhang Cai,Waqar Ahmed,Xiaoli Zhan,Fengqiu Chen,Dangguo Cheng,Qinghua Zhang
Natural species use their surface structures for water harvesting. It is the dire need of the hour to learn from nature, mimic its functions, and solve the water scarcity problem through dew condensation . However, the present microscale and nanoscale approaches still suffer from complicated fabrication methods and durability failure in harsh conditions. Here, we introduce a bioinspired slippery surface of candle soot particles which uses its bumps to enhance the growth of condensed water droplets. The Namib desert beetles-inspired convex topography, cacti-inspired asymmetric slope, and Nepenthes pitcher plant-inspired slippery surface of soot particles synergistically combines the large droplet nucleation density, fast droplet coalescence, and easy removal of droplet from the surface. The hydrophilic SLIPS of soot particles harvests water at a rate of 326.4 ± 9 mg/cm 2 h -1 which is 70 % high as compared to hydrophobic SLIPS of soot particles. The fluorinated SLIPS reveals 32 % high water collection rate as compared to the methyl-terminated SLIPS of candle soot particles and the results are corroborated by calculating the intermolecular hydrogen bonding energies through DFT. The programmed motion of water droplet on a slippery surface of soot particles is also observed by applying laser light, heat, and magnetic field even against gravity. The slippery surface shows long-term stability due to nano-porosity, permeation of lubricant into soot particles and lubricant’s crosslinking ability with the binder. The developed surface is biocompatible, self-cleaning, and suitable for water harvesting particularly in cold and arid regions.
研究领域:
材料科学
·
环境科学
·
生物学
✓ 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）