Applied Sciences-Basel
·
2020
·Vol. 10
·期 6
·1917
·
IF 2.474
Bilin Yang,Yujun Xie,Pan Zeng,Yurong Dong,Qiongrong Ou,Shuyu Zhang
Pressure and temperature are powerful tools applied to perovskites to achieve recrystallization. Lamination, based on recrystallization of perovskites, avoids the limitations and improves the compatibility of materials and solvents in perovskite device architectures. In this work, we demonstrate tightly compacted perovskite laminates on flexible substrates via hot-pressing and investigate the effect of hot-pressing conditions on the lamination qualities and optical properties of perovskite laminates. The optimized laminates achieved at a temperature of 90 °C and a pressure of 10 MPa could sustain a horizontal pulling pressure of 636 kPa and a vertical pulling pressure of 71 kPa. Perovskite laminates exhibit increased crystallinity and a crystallization orientation preference to the (100) direction. The optical properties of laminated perovskites are almost identical to those of pristine perovskites, and the photoluminescence quantum yield (PLQY) survives the negative impact of thermal degradation. This work demonstrates a promising approach to physically laminating perovskite films, which may accelerate the development of roll-to-roll printed perovskite devices and perovskite tandem architectures in the future.Keywords:perovskite lamination;hot-pressing;recrystallization;flexible substrates
研究领域:
材料科学
·
光电技术
✓ 已验证
产品关联
DOI
高影响因子
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
·
2016
·
IF 2.647
S. Miao,Z.M. Xie,T. Zhang,X.P. Wang,Q.F. Fang,C.S. Liu,G.N. Luo,X. Liu,Y.Y. Lian
In this paper, hot rolled W-0.5 wt% TiC alloys are fabricated via a combination of powder metallurgy and subsequent hot rolling with 65% thickness reduction. The as-rolled alloys show high strength of 789 MPa at 200 °C with a total elongation of 4.8%. We have explored the mechanical properties and thermal stability of W-0.5 wt% TiC alloys after annealing at various temperature. The corresponding results show that hardness and fracture strength slightly decrease with increased annealing temperature up to 1500 °C owing to recovery. While after annealing at 1600 °C for 1 h, the fracture strength of W-0.5 wt% TiC alloys decreases significantly due to full recrystallization and grain growth. The thermal conductivity increases with increased annealing temperature. The observed incubation time for recrystallization and the corresponding recrystallization thermal activation energy (~612 kJ/mol) for this rolled plates indicate a sufficient thermal stability at service temperature below 1200 °C. This good thermal stability is attributed to the nanosized TiC dispersion strengthened structures.
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
MINERALS ENGINEERING
·
2022
·
IF 5.479
Binbin Li,Qing Shi,Dezhi Liu,Saizhen Jin,Qingyun Luo,Zejun Wang
Recent studies on calcite have shown that newly precipitated clusters of amorphous calcium carbonate (ACC) and vaterite in pulp change the inherent reactivity of the calcite surface. The flotation recovery and surface zeta potential of calcite undergo rapid changes during the initial reaction time but are slightly altered after 60 min. In order to further understand the adverse effects of newly precipitated CaCO 3 on the flotation of calcite, the relationship between the recrystallization process of nascent calcium carbonate (CaCO 3 ) and the flotation behavior of calcite was explored under different time conditions in this study. Accordingly, during the recrystallization process, the intensity of the chemical reaction between ACC–vaterite–calcite and hexametaphosphate (SH) was found to gradually weaken through the flotation test, SEM, XRD and FTIR . Furthermore, due to the difference in crystal structure, ACC and vaterite were shown to strengthen the reactivity of SH and Ca 2+ on the surface of calcite in flotation through the zeta potential test and X–ray photoelectron spectroscopy (XPS), thereby weakening the ability of oleate (OL − ) in collecting the mineral.
研究领域:
矿物学
·
材料科学
·
化学工程
✓ 已验证
产品关联
DOI
高影响因子
CARBON
·
2017
·
IF 6.337
Guoying Bai,Dong Gao,Jianjun Wang
Carbonaceous particles, as one of the main sources of atmospheric aerosols, have great influence on the climate change, such as ice formation, precipitation and polar ice melting. Because sulphur-containing emissions can significantly affect the chemical compositions and properties of carbonaceous particles through various aging processes, it is critical to investigate the influence of sulphur-doped carbon materials on ice formation. Here, we synthesized a sulphur-doped carbon nanomaterial–sulphur-doped oxidized quasi-carbon nitride quantum dots (S-OCNQDs), and investigated the influence of chemical structure on ice growth and recrystallization. The experimental results show that the S-OCNQDs can inhibit ice growth/recrystallization. In addition, we found that forming more hydrogen-bonds with ice contributes to enhancing the efficiency of ice growth/recrystallization inhibition and that heteroatom-doping is a promising way to regulate the ice growth/recrystallization. This work correlates the specific chemical structures of carbon nanomaterials with their performance in inhibiting ice growth/recrystallization through their density of hydrogen-bonds formed with ice. It is instructive for understanding the effect of sulphur-doping on ice formation as well as the design of efficient anti-icing materials.
研究领域:
材料科学
·
环境科学
✓ 已验证
DOI
高影响因子
INTERNATIONAL JOURNAL OF REFRACTORY METALS & HARD MATERIALS
·
2021
·
IF 3.871
S. Miao,Y. Lin,Y.Q. Zhao,Z.M. Xie
This work described an experimental investigation on the recrystallization behaviors of the hot-rolled particle strengthened W (PSW) material. Upon annealing, the three processes, that is, recovery, recrystallization and grain growth, proceed in a discontinuous fashion for our PSW material, and two or more processes could simultaneously occur in local regions. At an annealing temperature spanning from 1300 °C to 1500 °C, recovery is in the dominant position which is verified by deformed grains over half of the whole, accompanying with a gentle decrease in hardness. Meanwhile, recrystallization nucleation, primary recrystallization and abnormal grain growth is identified at 1300 °C, 1400 °C and 1500 °C, respectively. Further increasing the annealing temperature to 1600 °C and 1700 °C, normal grain growth takes precedence over recovery, along with a marked reduction in hardness. TEM observations show that owing to microstructural heterogeneity induced by particle dispersion, local regions have an advantage in terms of strain energy storage over other regions during hot rolling, enabling a preferential recrystallization nucleation at 1300 °C; whereas nanosized TiC particles are capable of inhibiting grain growth at elevated temperature, and thus retard the recrystallization rate. In addition, our as-rolled PSW material exhibits a different texture, and the dominant α-fiber of {100}〈011〉 and {112}〈1−10〉 transforms into γ-fiber texture of {111}〈011〉 and {111}〈−1−12〉 during recrystallization.
研究领域:
材料科学
·
金属学
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS
·
2017
·Vol. 28
·期 16
·12297-12305
·
IF 2.019
Hou Baoting,Wang Xinlu,Yao Jing,Zhang Hongbo,Yu Wensheng,Liu Guixia,Dong Xiangting,Wang Limin,Wang Jinxian
A simple and novel method based on recrystallization-sulfurization method has been developed to fabricate Ce 2 S 3 /MoS 2 composite and their structure, morphology and electrochemical performance is researched systematically. The Ce 2 S 3 /MoS 2 composite exhibit enhanced electrochemical performance compared with Ce 2 S 3 and MoS 2 . Among them, Ce 2 S 3 /MoS 2 composite has an initial reversible discharge capacity of 187.5 mAh g −1 , coulombic efficiency of 78.6% and a reversible capacity as high as 636.5 mAh g −1 , coulombic efficiency of 99.7% after 500 cycles at a current density of 100 mA g −1 and the highest discharge capacity of 97.3 mAh g −1 at a high current density of 1000 mA g −1 , showing the best reversible capacity and cycling performance. The results show that the compositing between MoS 2 and Ce 2 S 3 can maintain the stability of the structure during the charge/discharge process and existence of Ce 2 S 3 can enhance the electrical conductivity of Ce 2 S 3 /MoS 2 composite and further improves the reversible capacities, cycling performance and rate performance of Ce 2 S 3 /MoS 2 composite.
研究领域:
材料科学
·
能源存储与转换
✓ 已验证
产品关联
DOI
高影响因子
Advanced Composites and Hybrid Materials
·
2025
·Vol. 8
·期 1
·1-13
·
IF 21.8
Tang Yubo,Huang Sheng,Chen Wei-chih,A Garu,Linghu Xitao,Wa Qingde,Huang Shuai,Chen Jian
Zn-Mn alloys are particularly promising biodegradable implant materials, but they are plagued by poor mechanical performance. In this work, a Zn-Mn alloy with ultrahigh strength and excellent ductility was achieved through addition of trace Mg (0.1 wt%) and equal channel angular pressing (ECAP). Specifically, the ECAP processed Zn-0.5Mn-0.1 Mg alloy exhibits an ultimate tensile strength (UTS) of 428 MPa, which is highest ever achieved in Zn-Mn-based alloys, along with a good elongation (EL) of 39%. In addition, the alloy exhibits excellent antibacterial performance against Staphylococcus aureus ( S. aureus ) and Escherichia coli ( E. coli ). Trace Mg addition results in the formation of Mg 2 Zn 11 and MgZn 2 nano-precipitates in the alloy, which effectively pins grain growth during dynamic recrystallization (DRX) and postpones the inverse Hall–Petch relation. Consequently, the alloy possesses quite fine grains of an average grain size (AGS) of 0.71 μm, much smaller than that of its counterpart without Mg (AGS = 2.54 μm). The ultrahigh strength of the alloy is mainly ascribed to grain boundary strengthening and precipitation strengthening. The remarkable ductility of the alloy is related to deformation twinning suppression, pyramidal < c + a > slip activation, and low dislocation density.
CAS / MDL:
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
RSC Advances
·
2013
·Vol. 4
·期 2
·954-958
·
IF 2.562
Guihua Li,Xuzhong Cui,Cuiying Tan,Nan Lin
Uniform and polycrystalline tellurium nanoplates with a thickness of 100–300 nm can be rapidly synthesized by a simple solvothermal method in mixtures of water and ethanediamine at 180 °C with the assistance of glucose. By adjusting the concentration of glucose, tellurium microrods and nanoplates can be prepared. Based on the electron microscope observations, a possible mechanism involved the self-assembly process and dissolution–recrystallization mechanism is proposed for explaining the formation of polycrystalline tellurium nanoplates and their transformation into single crystalline nanorods. Furthermore, the Raman scattering measurement for the different morphologies is conducted, and the polycrystalline nanoplates present the stronger Raman scattering spectrum.
研究领域:
材料科学
·
纳米技术
·
无机化学
·
凝聚态物理
·
光谱学
✓ 已验证
DOI
高影响因子
Journal of Materials Research and Technology-JMR&T
·
2022
·
IF 6.267
Wei Zhao,Rui-feng Liu,Jie Yan,Xian Wang,Hong-wei Zhang,Wen-xian Wang
The microstructure evolution and mechanical properties of 5 wt% SiC/7075Al composites processed with a combination of three-step spark plasma sintering (SPS), hot rolling (HR), and high-frequency electric pulse assisted treatment (HEAT) processing were investigated herein. It was found that the HEAT tremendously promoted the recrystallization behavior after the hot rolling, leading to grain refinement and residual stress weakening. It can be attributed to the combination of the electrical (Electron wind) and thermal effects (Joule heat) of pulse current. Electron wind promotes the expansion of the movement of dislocations, providing the material basis for recrystallization. Joule heat and residual stress within the matrix provide the substance conditions. There was a remarkable improvement in strength and ductility, among which the increase in strength was mainly due to the combined effect of phase precipitation strengthening and grain refinement, while the increase in elongation was mainly attributed to grain refinement and residual stress weakening. Compared to those of the untreated samples, the average grain size decreased by 18.3%, residual stresses reduced by 70%, and tensile strength improved by 37.3%. High-frequency assisted treatment has a comprehensive improvement on the microstructure and mechanical properties of SiC/7075Al composites.
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
Nano Energy
·
2016
·
IF 11.553
Fukun Ma,Yongzhong Wu,Yongliang Shao,Yueyao Zhong,Jiaxin Lv,Xiaopeng Hao
CdS systems represent promising photocatalysts for hydrogen generation ; however, these systems are seriously restricted by inherent issues with photocorrosion. Here, the CdS photocorrosion process is prevented and a high stable and effective photocatalyst is obtained in the novel 0D/2D CdS/MoS 2 nanosheet composite system . According to crystallization kinetics , the CdS photocorrosion process will be prevented if the S elements resulting from photocorrosion can be reduced back to S 2− in the same photocatalytic system. So a photocorrosion-recrystallization strategy is proposed for the first time to resolve issues with photocorrosion when using CdS photocatalysts. Meanwhile, the recrystallized 0D/2D CdS/MoS 2 nanocomposite produces a high quantum efficiency of 23.03% (λ ex =420 nm), the evolution of hydrogen presents no notable activity losses for up to 400 h. Thus, the approach demonstrated here represents a promising method of designing and fabricating more stable and efficient composite chalcogenide photocatalysts.
研究领域:
材料科学
·
能源化学
✓ 已验证
产品关联
DOI
高影响因子
MACROMOLECULES
·
2022
·
IF 6.057
Xin Liu,Yingshuang Shang,Qinfei Xu,Chenyi Zhou,Haibo Zhang,Xuanbo Zhu
Poly(arylene ether sulfone) resins are usually a class of amorphous polymers, which makes them inferior to other semicrystalline aromatic polymers in solvent resistance, chemical stability, and mechanical strength. Herein, a crystallizable poly(arylene ether sulfone ketone) with a high biphenylene content (BD-PESK) was designed and synthesized. BD-PESK showed excellent thermal stability with a Tg of 241 °C and 5% weight loss temperature of 548 °C. Meanwhile, BD-PESK exhibited an obvious melt memory effect at 350–370 °C, but a weak melt memory effect would survive even above its equilibrium melting point due to the high segment rigidity. Under the guidance of this effect, the melt recrystallization of BD-PESK with a maximum crystallinity of 23% can be realized effectively, which made it have excellent solvent resistance similar to the PEEK resin. Semicrystalline BD-PESK showed a high tensile strength up to 86 MPa with a good elongation at break of 23%. Furthermore, due to the combination of high Tg and semicrystallinity, BD-PESK could maintain 71% storage modulus at 240 °C and still 1.4% storage modulus at 300 °C, respectively, showing superior heat resistance to most thermoplastic polymers.
研究领域:
材料科学
·
高分子化学
✓ 已验证
DOI
高影响因子
ACS Applied Materials & Interfaces
·
2018
·
IF 8.097
Peitao Xiao,Lixia Sun,Dankui Liao,Phillips O. Agboola,Imran Shakir,Yuxi Xu
In the past years, considerable efforts have been devoted to the deliberate synthesis of nanosulfur in various hosts with sophisticated structures to improve the performance of lithium–sulfur batteries (LSBs) and reveal the structure–property relationship. It is taken for granted that these elaborate sulfur nanostructures are well maintained in the ultimate electrode after the traditional mixing and coating method. Herein, we, for the first time, reveal the unexpected sulfur structure deterioration in nanosulfur/graphene composites during the electrode preparation using the traditional method because of the long-term neglected dissolution–recrystallization effect of sulfur in solvents. Consequently, compared with binder-free three-dimensional graphene/sulfur electrodes, the milled graphene/sulfur electrodes exhibit much worse electrochemical performance. On the basis of this, we further propose a facile and universal graphene oxide-assisted assembly method to avoid the dissolution–recrystallization of sulfur, by which binder-free three-dimensional ethylenediamine-functionalized graphene/sulfur (3DEFGS) electrodes have been successfully prepared. The 3DEFGS electrodes with a high areal sulfur loading of ∼6 mg cm–2 exhibit an ultrahigh initial capacity of 1394 mA h g–1 at 0.1 C, an excellent rate performance with a capacity of 796 mA h g–1 at 4 C, and superior long-term cycling stability (885 mA h g–1 after 500 cycles at 1 C), which are among the best performances achieved by all reported LSB cathodes with high areal sulfur loadings.
研究领域:
材料科学
·
能源存储技术
✓ 已验证
产品关联
DOI
PubMed
高影响因子
危险品化学品经营许可证（带存储）