APPLIED CATALYSIS A-GENERAL
·
2018
·
IF 4.521
Jingjie Cao,Mingwei Ma,Jinchan Liu,Yongquan Yang,Hui Liu,Xingliang Xu,Jiahui Huang,Huijuan Yue,Ge Tian,Shouhua Feng
Aluminum ion-exchanged Ca-montmorillonite with different concentrations of aluminum ion were prepared and applied in the conversion of carbohydrates to 5-hydroxymethylfurfural (HMF). It was found that two types of acid sites were present in the catalyst, Lewis acid sites for isomerization of glucose and Brønsted acid sites for dehydration of fructose. With Al-mont-10 as catalyst, the yield of HMF converted from glucose was 80.4% in a biphase system (THF: NaCl solution) at 180 °C for 2.5 h. Further, the catalyst also shows excellent catalytic performance in the conversion of starch and inulin, and the yield of HMF reached 60.1% and 81.6% under identical conditions, respectively.
研究领域:
化学工程
·
催化科学
✓ 已验证
DOI
高影响因子
Journal of Cleaner Production
·
2025
·
IF 10
Shuyang Shi,Baozhong Ma,Hui Yang,Zhihe Cao,Yubo Liu,Yongqiang Chen,Chengyan Wang
In bauxite-scarce China, aluminum extraction from alternative resources via the acid leaching process is promising. However, critical gaps persist: (1) pyrolysis yields lightweight alumina with limited market capacity, and (2) direct electrolytic alumina synthesis from acid leach liquor remains unexplored, especially alumina particle size control. The production of coarse boehmite as an alumina precursor via high-temperature autohydrolysis was investigated in this paper. First, the hydrolysis characteristics of Al 3+ were revealed by thermodynamic analysis. Subsequently, the experimental parameters and hydrolysate particle size were optimized through a series of experiments. Under optimal conditions, an Al hydrolysis ratio of 82.6 % and a median particle size of 27.1 μm for polycrystalline boehmite were achieved. The morphological evolution of boehmite was revealed by SEM. The hydrolysis path was determined by analyzing the variation of Al-ion species with pH. Kinetics demonstrated that the hydrolysis process followed heterogeneous nucleation and was chemically controlled, with an apparent activation energy of 52.2 kJ/mol. Finally, a novel process for electrolytic Al 2 O 3 preparation and simultaneous HNO 3 regeneration using coal gangue and fly ash as raw materials was proposed. This study establishes a technological foundation for producing electrolytic alumina from aluminum-containing solid wastes, providing a novel route for large-scale aluminum resource recovery.
研究领域:
化学工程
·
材料科学
✓ 已验证
产品关联
DOI
高影响因子
Surfaces and Interfaces
·
2026
·
IF 6
Wuxiu Ding,Duo Sun,Lan Zhang,Hongyi Wang,Yang Zhao,Weiguo He,Zhigang Du,Yongyan Yan
Applying protective coatings to the surface of stone heritage is one of the most common methods for its preservation. To enhance the weathering resistance of the limestone heritages, MIL-53@FS, a hydrophobic metal-organic framework (MOF) composite, was prepared through fluorosilane modification of MIL-53-OH synthesized via a solvothermal method. Characterization analyses were conducted using SEM, XRD, TGA, and FTIR techniques. The results indicated that MIL-53@FS maintained its well-ordered framework structure and certain porosity, while forming a continuous and uniform hydrophobic coating, leading to a significant increase of water contact angle to 127.14° and enhanced thermal stability. It exhibited excellent corrosion resistance, anti-icing performance, and color compatibility in the application tests, holding a promising outlook for protecting limestone-based heritages.
✓ 已验证
产品关联
DOI
高影响因子
Materials
·
2019
·Vol. 12
·期 22
·3751
·
IF 2.972
Gongjun Cui,Yanping Liu,Guijun Gao,Huiqiang Liu,Sai Li,Ziming Kou
Ti–Al matrix alloy reinforced with a high content of boron was fabricated by using a high-temperature alloying method and powder metallurgy technique (P/M). The preparation method of Ti–Al–B alloying powder was put forward. Phases, microstructure, and mechanical properties of the alloys were investigated. Wear and friction performance were studied by using a ball-on-disc tribotester sliding against a Si3N4ceramic ball from 23 °C (room temperature) to 900 °C. The Ti–Al–B alloy had a higher specific strength than that of the Ti–Al alloy. The boron element obviously enhanced the wear resistance and mechanical properties of the alloys because of the formation of borides (TiB2and AlB2) in matrices and the stable oxide film on the wear tracks. Friction coefficients of alloys were independent of the boron element. The wear mechanisms of the alloys transferred from fatigue wear to oxidative wear with the increase in temperature.
✓ 已验证
DOI
高影响因子
JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS
·
2020
·Vol. 31
·期 8
·6036-6044
·
IF 2.22
Wang Shimin,Xiang Mingwu,Lu Yao,Guo Junming,Su Changwei,Bai Hongli,Liu Xiaofang
A series of aluminum and nickel (Al–Ni) co-doped LiAl 0.15 Ni x Mn 1.85− x O 4 composites are prepared through a facile solid-state combustion method. All the as-obtained materials show a spinel structure and analogous spherical morphology with uniform particle distribution. Moreover, the synergistic merits of Al and Ni dual substitutions endow the spinel LiMn 2 O 4 with an elevated Mn average valence state of 3.59 and relatively alleviative Jahn–Teller distortion. Among these samples, the LiAl 0.15 Ni 0.03 Mn 1.82 O 4 (LANMO-0.03) cathode exhibits an optimal electrochemical performance with the discharge capacities of 103.3 mAh g −1 and 102 mAh g −1 at 1 C and 5 C in the first cycle, and the capacity retentions are 72.0% and 68.6% after 1000 cycles, respectively. Even at 1 C and high temperature of 55 °C, an excellent capacity retention remained to be 76.6% after 200 cycles. Furthermore, the LANMO-0.03 has good Li + diffusion capability during charge/discharge, the D Li + value of the LANMO-0.03 (1.65 × 10 –11 cm 2 ∙s −1 ) is higher than that of the LiAl 0.15 Mn 1.85 O 4 (LAMO) (8.12 × 10 –12 cm 2 ∙s −1 ), and the charge transfer resistances of the LAMO and LANMO-0.03 samples are almost the same at 150 Ω before cycling but decrease to 130 Ω and 95 Ω after 1000 cycles at 1 C, respectively. These results demonstrate that the Al–Ni co-doped strategy can enhance the structural stability and provide stable Li + diffusion channel during the long cycles even at elevated temperature. Meanwhile, the facile solid-state combustion approach can also be extended to the preparation of other dual cation-doped electrode materials.
✓ 已验证
DOI
高影响因子
MATERIALS CHARACTERIZATION
·
2022
·
IF 4.537
Jianglong Yi,Cheng Chang,Xingchen Yan,Yingchun Xie,Yunzhong Liu,Min Liu,Kesong Zhou
Manufacturing of the 7075 wrought aluminum alloys by selective laser melting technology (SLM) is extremely difficult owing to the inherent low laser absorptivity , poor weldability and cracking. To address these challenges and improve the mechanical properties of the SLM Al 7075 alloy, a novel hierarchical manufacturing method of the selective laser melted Al 7075 alloy from the nanometer scale to the millimeter scale was presented in this study. Nano-WC/Al 7075 sample with fine equiaxed grains was fabricated using SLM. Fewer cracks can be detected within the SLM nano-WC/Al 7075 alloy than the SLM Al 7075 alloy. A large quantity of nano-WC and sintered micro-WC particles were distributed within the equiaxed grains. A well-coherent interface with low lattice mismatch (i.e. 2.03%) is exhibited at the (111) α-Al /(001) WC planes. Al 4 W, Al 2 Cu and MgZn 2 phases nucleated and grew on the surface of the nano-WC particles. A type of fine microstructure composed of the hierarchically reinforced micro/nano particles is produced in the SLM nano-WC/Al 7075 sample, resulting in an excellent micromechanical properties . Notably, wear rate of the SLM nano-WC/Al 7075 sample is about 40.4% lower than that of the SLM Al 7075 specimen, similarly with that of the SLM Ti6Al4V counterpart. These results highlight that the site-specific and quantitative modification of nano-WC particles of Al 7075 powder can be achieved using electrostatic self-assembly. Therefore, introducing nano-WC particles and generating multiple micro/nano reinforcement phases is an effective method to significantly improve their tribological properties.
✓ 已验证
DOI
高影响因子
ACS Applied Materials & Interfaces
·
2013
·
IF 5.008
Wenchao Zhang,Baoqing Yin,Ruiqi Shen,Jiahai Ye,Jason A. Thomas,Yimin Chao
A three-dimensionally ordered macroporous Fe2O3/Al nanothermite membrane has been prepared with a polystyrene spheres template. The nanothermite, with an enhanced interfacial contact between fuel and oxidizer, outputs 2.83 kJ g–1 of energy. This is significantly more than has been reported before. This approach, fully compatible with MEMS technology, provides an efficient way to produce micrometer thick three-dimensionally ordered nanostructured thermite films with overall spatial uniformity. These exciting achievements will greatly facilitate potential for the future development of applications of nanothermites.
研究领域:
材料科学
·
纳米技术
·
含能材料
·
微机电系统（MEMS）
✓ 已验证
DOI
高影响因子
CHEMISTRY OF MATERIALS
·
2022
·
IF 10.508
Dequan Jiang,Ting Wen,Yanzhen Guo,Jie Liang,Zimin Jiang,Chen Li,Ke Liu,Wenge Yang,Yonggang Wang
Anomalous compression behaviors such as negative linear compressibility (NLC) and negative area compressibility (NAC) are emerging functionalities essential for utilities under extreme conditions. Metal–organic frameworks (MOFs) present a large family of NLC/NAC materials under the well-recognized “wine-rack” mechanism. Nevertheless, the working pressure of MOFs is limited to typically no more than 3 GPa. Herein, we report the observation of a rare reentrant NLC behavior of MIL-53(Al) over an ultrawide pressure region up to 41.6 GPa. MIL-53(Al) with the classic wine-rack topology first exhibits an NLC behavior along the c-axis in the pressure region of 0–2.7 GPa, followed by a normal compression process between 2.7 and 12.9 GPa. After that, it is surprising to find that the reentrant NLC property remains at a record-high pressure (>40 GPa) among the previously reported MOFs. The mechanisms of the distinct compression behaviors of MIL-53(Al) in the three stages are studied by combining the X-ray diffraction analyses, Raman spectra, and DFT calculation. Particularly, the photoluminescence of Cr3+ is used as a unique probe for the subtle changes of the local coordination environments of Al3+ under compression. Both the absorption spectra and photoluminescence of Cr3+-doped MIL-53(Al) not only verify the three-stage compression processes but also reveal a hidden structural/electrical phase transition around 22.0 GPa. These findings provide an in-depth understanding of the structure–property relationship of abnormal compression behavior at the local-structure level.
研究领域:
材料科学
·
高压物理
·
无机化学
·
金属有机框架（MOFs）
·
凝聚态物理
✓ 已验证
DOI
高影响因子
ACTA PHYSICO-CHIMICA SINICA
·
2013
·Vol. 29
·期 8
·1804-1808
·
IF 0.869
WANG Shun-Kui,LI Zhi-Jie,XIAO Xue-Zhang,FAN Xiu-Lin,CHEN Zhi-Wen,LI Shou-Quan,GE Hong-Wei,CHEN Li-Xin
The Na-Al-H complex hydride was prepared by reactive ball milling (NaH/Al+CeCl3) and (NaH/Al+CeCl3/yKH) (y=0.02, 0.04) composites under a hydrogen pressure of 3 MPa at room temperature, using NaH and Al powder as raw materials, as well as 2% (molar
fraction) CeCl3 and 2% CeCl3/y% KH (y=0.02, 0.04) as dopant, respectively. The de-/hydrogenation properties show that the addition of KH can effectively improve the dehydrogenation kinetics of second decomposition step for Na-Al-H system. The (NaH/Al+CeCl3/0.02KH)
composite can complete dehydrogenation process within 20 min at 170, with good de-/hydrogenation cycling performance at relatively low temperature (100-140). Calculation by Kissenger method shows that the addition of KH could decrease the apparent activation energy of second decomposition
step for Na-Al-H system, resulting in the decrease of desorption peak temperatures. Phase structure analysis shows that the enhanced second step dehydrogenation kinetics of Na-Al-H composite system is mainly ascribed to the lattice volume expansion of Na3AlH6 resulted
from the addition of KH.
研究领域:
材料科学
·
氢能存储
·
固态化学
✓ 已验证
DOI
高影响因子
ACS Applied Materials & Interfaces
·
2015
·
IF 6.723
Wen Jiang Zheng,Ning An,Jian Hai Yang,Jinxiong Zhou,Yong Mei Chen
Tough Al-alginate/poly(N-isopropylacrylamide) (PNIPAM) hydrogel has been synthesized by introducing an interpenetrating network with hybrid physically cross-linked alginate and chemically cross-linked PNIPAM. Varying the concentration of AlCl3 regulates the mechanical properties of the tough hydrogel and tunes its lower critical solution temperature (LCST) as well. The tough Al-alginate/PNIPAM exhibits 6.3 ± 0.3 MPa of compressive stress and 9.95 of uniaxial stretch. Tunability of LCST is also achieved in a wide range within 22.5–32 °C. A bending beam actuator and a four-arm gripper made of bilayer (Na-alginate/PNIPAM)/(Al-alginate/PNIPAM) hydrogel as prototype of all-hydrogel soft robotics are demonstrated. A finite element (FE) simulation model is developed to simulate the deformation of the soft robotics. The FE simulation not only reproduces the deformation process of performed experiments but also predicts more complicated devices that can be explored in the future. This work broadens the application of temperature-responsive PNIPAM-based hydrogels.
研究领域:
材料科学
·
软体机器人
·
聚合物水凝胶
·
刺激响应材料
·
生物医学工程
✓ 已验证
DOI
高影响因子
Food Additives & Contaminants Part B-Surveillance
·
2024
·
IF 2.5
Ping Wang,Gexiang Zhang
This study conducted a dietary exposure assessment of chloropropanols and aluminium, after quantifying their content in food. The mean dietary exposure to Al from total grain products was found to be 6.4E–04 mg/kg bw/week, not exceeding the provisional tolerable weekly intake (PTWI). The results showed that the mean dietary exposure of 3-monochloro-1,2-propanediol (3-MCPD) from grain products was higher than the tolerable daily intake (TDI). Deterministic evaluations showed that the mean HQ of 1.5 to Al from fried dough twist was higher than 1. However, the HI values to Al were lower than 1 and the Monte Carlo simulation (MCS) showed that the HQ was greater than 1 at the 99% exposure level. Deterministic and probabilistic methods indicated that HQ values of 3-MCPD from grain products were above 1, whereas the mean HI value was 0.62.
✓ 已验证
DOI
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2026
·
IF 13.2
Xiaoxia Ma,Changcheng Bao,Lin Shi,Junzhe Xu,Wei Liu,Jimin Han,Li Yang
Al/CuO nanothermite films are prone to cracks/gaps that alter combustion behavior. This study investigates nanothermite films with engineered gaps, focusing on particle advection. Using high-speed microscopy (70,000 fps, submicron resolution), we find gaps induce a “V-shaped” reaction front, boosting the combustion rate by 6-fold (929 vs. 153.8 mm/s for gap-free films). Maximum enhancement occurs at gaps of 0–200 μm, where molten Al 2 O 3 /Cu particles (~4.8 μm in diameter, ~7 m/s in velocity) traverse the gaps to ignite unreacted regions, acting as the primary driver for accelerated combustion. Beyond 200 μm, enhancement diminishes as particles solidify upon cooling to the phase transition temperature, rebound upon reaching the opposite side, and ultimately cause ignition failure. A condensation model with experimental parameters as input explains this phenomenon: Al 2 O 3 solidifies within the 200 μm range, while Cu solidifies within the 600 μm range. Simulation results confirm that combustion acceleration is significant before both particles are fully solidified, with the enhancement diminishing after Al 2 O 3 solidifies and nearly no combustion acceleration occurring after Cu solidifies. These findings clarify the structure-property relationship of energetic films, laying a solid foundation for the regulation of ignition timing based on the gap-burning rate correlation. The prepared lightweight, thin, and coatable films are suitable for microdevices, further opening up a new path for the development of multi-timing complex logic ignition networks.
✓ 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）