Journal of Materials Research and Technology-JMR&T
·
2021
·
IF 5.039
Bohan Wang,Jiaming Liu,Shipeng Yue,Xianlong Wang,Yubo Zhang,Ying Fu,Tingju Li,Tongmin Wang
In this study, the silane coupling agent 3-aminopropyltriethoxysilane (APS) was used to cross-link graphene oxide (GO) to large-sized films, and further to prepare nacre-like structure graphene/aluminum (Al) composites. The results show that APS was successfully grafted onto the GO, forming large continuous GO films, which were then attached to the surface of the Al flakes by semi-powder metallurgy. After hot pressing, the graphene/Al composites had a lamellar structure consisted of reduced graphene oxide (rGO) and Al. In addition, the interface was well bonded without defects and Al 4 C 3 phase. Compared with the pure Al prepared under the same condition, the compressive strength, maximum compression ratio and hardness of the 0.15 wt.% graphene/Al composites increased by 58%, 23% and 64.8%, respectively. The approach of cross-linking GO through chemical modification can be applied to the design of other bioinspired materials.
✓ 已验证
产品关联
DOI
高影响因子
Colloid and Interface Science Communications
·
2021
·
IF 4.914
Yuze Zhang,Lijuan Li,Dong Shi,Fugen Song
Layered double hydroxides intercalated with sorbate anion (SLDHs) was a potential material for sorbic acid controlled-releasing, UV barrier, reinforcement of rubber and flame retardancy filler. The addition reactions of sorbate anion (SAa) with ethylene and H radical were calculated as spontaneous on B3LYP/6–311++ (d, p) theory level by GAMESS-US and the electrostatic potential (ESP) of SAa was calculated by Multiwfn package and figured by VMD. SLDHs was successfully synthesized by co-precipitation with chlorides, and intercalating way of SAa was first constructed by electrostatic potential analysis, and then the successful intercalation of SAa was confirmed by X-ray diffractions (XRD) and Fourier transform infrared spectroscopy (FTIR). SLDHs possessed assembled flaky morphology and have good thermal stability with a water contact angle near 95°. This study may have a significance on the promotion of the scale application of SLDHs practically.
✓ 已验证
产品关联
DOI
高影响因子
International Journal of Minerals Metallurgy and Materials
·
2020
·Vol. 27
·期 12
·1711-1722
·
IF 1.713
Wang Jun-xiang,Tu Ji-guo,Jiao Han-dong,Zhu Hong-min
Aluminum storage systems with graphite cathode have been greatly promoting the development of state-of-the-art rechargeable aluminum batteries over the last five years; this is due to the ultra-stable cycling, high capacity, and good safety of the systems. This study discussed the change of electrochemical behaviors caused by the structural difference between flake graphite and expandable graphite, the effects of temperature on the electrochemical performance of graphite in low-cost AlCl 3 –NaCl inorganic molten salt, and the reaction mechanisms of aluminum complex ions in both graphite materials by scanning electron microscopy, X-ray diffraction, Raman spectroscopy, cyclic voltammetry, and galvanostatic charge–discharge measurements. It was found that flake graphite stacked with noticeably small and thin graphene nanosheets exhibited high capacity and fairly good rate capability. The battery could achieve a high capacity of ∼219 mA hg −1 over 1200 cycles at a high current density of 5 Ag −1 , with Coulombic efficiency of 94.1%. Moreover, the reaction mechanisms are clarified: For the flake graphite with small and thin graphene nanosheets and high mesopore structures, the reaction mechanism consisted of not only the intercalation of \({\rm{AlCl}}_4^ - \) anions between graphene layers but also the adsorption of \({\rm{AlCl}}_4^ - \) anions within mesopores; however, for the well-stacked and highly parallel layered large-size expandable graphite, the reaction mechanism mainly involved the intercalation of \({\rm{AlCl}}_4^ - \) anions.
✓ 已验证
产品关联
DOI
高影响因子
Journal of Materials Research and Technology-JMR&T
·
2020
·
IF 5.289
Chenguang Liu,Liming Yu,Zongqing Ma,Yongchang Liu,Chenxi Liu,Huijun Li,Hui Wang
Effects of Y 2 W 3 O 12 particle inclusions and content on damping capacity of Al–12Si composites have been investigated. The Y 2 W 3 O 12 , which is a kind of negative thermal expansion material, can generate high local strain in the composites. Thermal expansion testing shows that the coefficient of thermal expansion (CTE) of Y 2 W 3 O 12 has obvious changes between 100 and 200 °C The Y 2 W 3 O 12 /Al–12Si composites show damping peaks and display higher damping capacities than the pure Al–12Si alloy. The damping capacities of composites strongly depends on the content of Y 2 W 3 O 12 inclusions. A thermal strain damping model is also established. Based on the model analysis results, there is a significant contribution of thermal strain to the damping capacity in the composites; the change in CTE of Y 2 W 3 O 12 could cause the generation of damping peaks. Moreover, dislocation damping and interfacial damping are also main damping mechanisms in the investigated composites.
✓ 已验证
产品关联
DOI
高影响因子
Nano-Micro Letters
·
2020
·Vol. 12
·期 1
·1-13
·
IF 12.264
Liu Sisi,Li Ming-Yu,Zhang Jianbing,Su Dong,Huang Zhen,Kunwar Sundar,Lee Jihoon
AbstractSection
Highlights
High performance Al nanostructures/ZnO quantum dots heterostructure photodetectors with a controllable geometry of the Al nanostructures are demonstrated.
Light utilization of the photoactive layers is significantly boosted with the Al nanostructures.
The light confinement effect is inherently determined by the geometries of the Al nanostructures.
AbstractSection
Abstract
Light confinement induced by spontaneous near-surface resonance is inherently determined by the location and geometry of metallic nanostructures (NSs), offering a facile and effective approach to break through the limitation of the light-mater interaction within the photoactive layers. Here, we demonstrate high-performance Al NS/ZnO quantum dots (Al/ZnO) heterostructure UV photodetectors with controllable morphologies of the self-assembled Al NSs. The Al/ZnO heterostructures exhibit a superior light utilization than the ZnO/Al heterostructures, and a strong morphological dependence of the Al NSs on the optical properties of the heterostructures. The inter-diffusion of Al atoms into ZnO matrixes is of a great benefit for the carrier transportation. Consequently, the optimal photocurrent of the Al/ZnO heterostructure photodetectors is significantly increased by 275 times to ~ 1.065 mA compared to that of the pristine ZnO device, and an outstanding photoresponsivity of 11.98 A W −1 is correspondingly achieved under 6.9 mW cm −2 UV light illumination at 10 V bias. In addition, a relatively fast response is similarly witnessed with the Al/ZnO devices, paving a path to fabricate the high-performance UV photodetectors for applications.
✓ 已验证
产品关联
DOI
PubMed
高影响因子
APPLIED CATALYSIS B-ENVIRONMENTAL
·
2020
·
IF 16.683
Juan Zhang,Yulong Shan,Ling Zhang,Jinpeng Du,Hong He,Shichao Han,Chi Lei,Sen Wang,Weibin Fan,Zhaochi Feng,Xiaolong Liu,Xiangju Meng,Feng-Shou Xiao
As a commerical catalyst of high silica CHA zeolite for NH 3 -SCR reaction, controllable Al sites in CHA framework for improving catalytic performance are rarely reported. In this work, two organic templates (TMAda + and DMCHA + ) were employed to prepare aluminosilicate CHA zeolite with similar Si/Al ratios, donated as CHA-T and CHA-D. Detailed characterizations demonstrate that two completely distinguishable crystallization pathways can be identified as the preferential formation of smaller D6R units for CHA-D with DMCHA + and larger 8MRs for CHA-T with TMAda + , resulting in spatially closer Al sites in CHA-D than CHA-T. As an interpretation, CHA-D with more paired Al atoms in 6MR generating more hydrothermally stable Cu 2+ -2Z sites contributes to higher activity than CHA-T at 400−550 °C. These results suggest that the crystallization pathways directed by rational choice of organic templates might be responsible for the controllable Al sites in the framework, which is important for designing efficient NH 3 -SCR catalysts.
✓ 已验证
产品关联
DOI
高影响因子
APPLIED CLAY SCIENCE
·
2020
·
IF 4.605
Shaoxiu Li,Yuhe Yang,Su Huang,Zhifeng He,Changhui Li,Dongmei Li,Bohan Ke,Chan Lai,Qiuyi Peng
Magnetic Zn/Al layered double hydroxides (M Zn/Al LDH) were prepared by co-precipitation method and then calcined at 370 °C for 2 h to obtain magnetic Zn/Al calcined layered double hydroxides (M Zn/Al CLDH) used for adsorption of humic acid (HA) from aqueous solution. The morphology and structure of M Zn/Al CLDH were characterized by scanning electron microscope (SEM), X-ray diffraction (XRD), Fourier transform infrared spectroscopy (FTIR), specific surface area (SSA), thermogravimetric analysis and differential scanning calorimetry (TG-DSC) and vibrating-sample magnetometer (VSM), respectively. The results showed that the implant of a certain amount of magnetic substrates on Zn/Al LDH didn't damage the layered structure of Zn/Al LDH. After calcination, M Zn/Al CLDH exhibited the characteristics of zinc aluminum oxides, whose specific surface area increased to 80.00m 2 /g from 49.15 m 2 /g of M Zn/Al LDH. The magnetism of M Zn/Al LDH originating from Fe 3 O 4 and γ-Fe 2 O 3 kept well under calcination at 370 °C. The influence of solution pH and competitive ions on the HA removal was investigated. M Zn/Al CLDH exhibited high HA removal efficiency which was over 97% from pH 4 to pH 8 for 30 min at M Zn/Al CLDH dosage of 0.2 g/L and HA initial concentration of 20 mg/L. The kinetic, adsorption isotherm and thermodynamic of the adsorption of HA by M Zn/Al CLDH were studied. The results indicated that the adsorption followed pseudo-second-order kinetics model and Langmuir isotherm model. Thermodynamic analysis suggested that the adsorption of humic acid on M Zn/Al CLDH was a spontaneous and endothermic process . The adsorption mechanism is associated with electrostatic interaction and the intercalation of some functional groups of HA during layered structure of M Zn/Al LDH recovery in water due to the memory effect . This study revealed that M Zn/Al CLDH was an effective adsorbent for HA removal in water treatment .
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
·
2021
·
IF 5.316
Qi Chen,Xinjian Li,Yao Wang,Jian Wang,Lijie Chang,Yuewen Zhang,Hongan Ma,Xiaopeng Jia
ZnO has excellent electrical properties such as high conductivity ( σ ) and Seebeck coefficient (S) that are important for its thermoelectric properties and have provided the basis for obtaining improved ZnO-based thermoelectric materials by doping. In particular, the most representative Al-doped ZnO (AZO) has excellent thermoelectric performance. Although the Al doping is beneficial for reducing the lattice thermal conductivity of ZnO, the solubility of Al 2 O 3 in ZnO is limited and excessive doping of Al gives rise to the generation of a large amount of the ZnAl 2 O 4 secondary phase that limits the further improvement of the electrical properties. Thus, it is crucial to develop approaches to reduce thermal conductivity while still maintaining high electrical properties. In this work, high pressure and high temperature (HPHT) synthesis was used to adjust the ZnO optical band gap by modifying the lattice parameters of ZnO, and thereby improving the electrical properties of the sample. It was found that the optimal doping content for the samples synthesized at high pressure is different from that of the samples synthesized at normal pressure, providing a new approach for the further improvement of the thermoelectric properties of ZnO. Additionally, high pressure can promote grain refinement that is conducive to the generation of the multi-scale hierarchical structure of the sample that introduces a variety of phonon scattering mechanisms to reduce the thermal conductivity while maintaining a high power factor. The Zn 0.96 Al 0.04 O material obtained by sintering at a pressure of 3 GPa and a temperature of 1053 K for 30 min reached the highest power factor (7.8 µW cm −1 K −2 ) and the highest zT (0.16) at 973 K.
✓ 已验证
产品关联
DOI
高影响因子
JOM
·
2021
·Vol. 73
·期 12
·3727-3733
·
IF 2.474
Yang Jiaxin,Tao Wenju,Chen Liyu,He Jingui,Zhang Yifan,Yu Jiangyu,Wang Zhaowen
The preparation of high-purity and high-value alloys is of great significance to industrial production. The purpose of this study is to explore the process of producing aluminum-silicon (Al-Si) alloy by the electrochemical Al-Si eutectoid method. The electrochemical behavior of aluminum and silicon on tungsten electrode was studied by cyclic voltammetry and galvanostatic chronopotentiometry. The effect of SiO 2 addition on the eutectoid behavior of Al and Si was studied. The results show that the precipitation potential of Al is about –1.35 V (versus Pt), and the initial precipitation potential of Si is about –0.8 V (versus Pt). The precipitation process of silicon includes two reduction stages. In addition, the precipitation of Si is a quasireversible reaction controlled by diffusion process. Finally, Al-Si alloy was obtained by potentiostatic electrodeposition at –1.8 V potential, indicating that Al and Si would codeposit at this potential.
✓ 已验证
产品关联
DOI
高影响因子
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
·
2019
·
IF 4.081
Ning Guo,Ping Shen,Rui-Fen Guo,Qi-Chuan Jiang
The strength and toughness of a material are generally two mutually exclusive properties. Optimization of these properties can be realized by regulating microstructures based on a bio-inspired idea. Herein, we used gelatin as a pore-regulating agent to investigate the effect of microstructural transition from “nacre-like” lamellae to “honeycomb-like” reticulae on the mechanical properties of metal–ceramic composites. By introducing different quantities of gelatin into SiC slurries during freeze casting and infiltrating the sintered SiC scaffolds with pure molten Al, we prepared the Al/SiC (88/12 in volume) composites with variable yet controllable microstructures and further demonstrated that the desired properties could be achieved by tailoring their microstructures. Specifically, the Al/SiC composites with a fully laminated structure exhibited optimal fracture toughness ( K Jc ) of 51.9 ± 2.9 MPa m 1/2 while those with a three-dimensional reticular structure displayed peak three-point flexural strength of 371 ± 6 MPa. The relationship between the microstructures and mechanical properties of the composites was addressed based on material strengthening and toughening mechanisms.
✓ 已验证
产品关联
DOI
高影响因子
VACUUM
·
2019
·
IF 2.515
Yanjun Yin,Xueming Li
This study focus on the combustion performance and energy released of self-propagating Al/CuO nanothermite with nanorod structure comprehensively. CuO nanorods with lengths of 50 nm–100 nm were synthesized in large scale by template-free hydrothermal method . Al/CuO nanothermite coatings were further built successfully by co-deposition of the as-prepared CuO nanorods and nano-Al via electrophoretic deposition (EPD). Additionally, the EPD kinetic behavior of CuO nanorods and Al/CuO composites is investigated comprehensively. The optimum deposition time is 15 min and the composites is much homogenous when equivalence ratio (Ф) of Al and CuO is 0.75. Furthermore, the onset temperature is down to 315 °C and the energy release is approximately 3043 J/g along with rapid and violent combustion performance in the thermite reaction of Al/CuO nanorods. It is speculated that the excellent properties of the Al/CuO nanothermite could be ascribed to the uniform distributing and intimate interfacial contact between nano-Al and CuO nanorods.
✓ 已验证
产品关联
DOI
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2019
·
IF 8.355
Heng Zhang,Muhammad Usman Tahir,Xiuling Yan,Xueming Liu,Xintai Su,Lijuan Zhang
Using sodium oleate as surfactant and intercalating agent, a regulated Ni-Al layered double hydroxide (NA-LDH-OA) nanosheets with a high interlayer space were prepared by two-phase method combined with a short reflux process and mild solvothermal reaction. In the process of electrochemical reaction, the electron transport is accelerated by the higher base spacing of the NA-LDH-OA ultrathin nanosheets. The as-prepared material exhibited a high specific capacity (1.040 C cm −2 at a current density of 1.68 mA cm −2 ) and good cycling performance (capacity retention of 88.25% after 2000 cycles) in a three-electrode system. Moreover, an aqueous asymmetric supercapacitor (ASC) was assembled using the synthesized NA-LDH-OA nanosheets as the positive electrode and activated carbon (AC) as the negative electrode. The aqueous ASC device (NA-LDH-OA-2//AC) achieved a high energy density of 40.26 Wh kg −1 at a power density of 943 W kg −1 , and a good cycling performance of 94.5% retention after 5000 cycles. These results demonstrated that the NA-LDH-OA nanosheets possess the potential for upcoming energy storage devices.
✓ 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）