Materials
·
2020
·Vol. 13
·期 23
·5469
·
IF 3.057
Haiqiang Ma,Kun Jiao,Xiangyu Xu,Jiaqing Song
A novel structure aluminosilicate molecular sieve, named BUCT-3, was prepared by dynamic hydrothermal synthesis, and the critical factor to obtain the new structure is using an active silicon and aluminum source, aluminosilica perhydrate hydrogel. Meanwhile, only high content of O-O bonds can ensure the pure phase of BUCT-3. Through the characterization of x-ray powder diffraction (XRD), Fourier transform infrared spectra (FTIR), scanning electron microscopy (SEM), and so on, some structure and morphology information of BUCT-3 molecular sieves as well as the special silicon and aluminum source was obtained. It’s worth noticing that the O-O bonds of reactants can be reserved in the products, and thus, help us to get a new structure with cell parameters a = 8.9645 Å, b = 15.2727 Å, c = 11.3907 Å, α = 90°, β = 93.858°, γ = 90°. The crystal system is monoclinic. Though the thermostability of BUCT-3 is not satisfactory, its potential application derived from O-O bonds cannot be neglected.Keywords:aluminosilica perhydrate hydrogel;molecular sieve;peroxides;silicon-aluminum source;synthesis method
研究领域:
材料科学
·
化学工程
✓ 已验证
产品关联
DOI
PubMed
高影响因子
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
·
2019
·
IF 4.081
Xinghai Liu,Enzuo Liu,Jiajun Li,Chunnian He,Naiqin Zhao
The interface plays a vital role in determining the microstructure and mechanical properties of metal matrix composites . The interfacial reactant, aluminum carbide (Al 4 C 3 ), has a great influence on the mechanical properties of carbon nanomaterials reinforced aluminum matrix composites (C/Al). However, due to the relatively weak controllability of Al–C interfacial reaction by traditional ex-situ methods, there is a lack of comprehensive study on the evolution and strengthening effects of Al 4 C 3 so far. In this study, Al 4 C 3 nanophase was produced by an appropriate annealing treatment from 500 °C to 630 °C in in-situ synthesized carbon nanosheets/aluminum composites (CNS/Al). The evolution and strengthening effects of Al 4 C 3 was investigated comprehensively. It was found that the formation of Al 4 C 3 plays a vital role in reducing the interfacial thermal expansion and improving the Al–C interfacial wettability . Thereby, a robust interfacial bonding among CNS, Al 4 C 3 and Al forms, resulting in the improvement of tensile strength of the composites. The tensile strength of the 1.0 wt%-CNS/Al composite after 30 min annealing at 600 °C reaches 245 MPa, which is ~113% higher than pure Al. The 22.3% of elongation exhibits a favorable strength-ductility balance. The main strengthening mechanisms are the Orowan dislocation strengthening, load transfer and grain refinement. The evolution of CNS and Al 4 C 3 combined with their strengthening contributions were quantitatively investigated in detail.
研究领域:
材料科学
·
机械工程
✓ 已验证
产品关联
DOI
高影响因子
Carbon Energy
·
2021
·Vol. 4
·期 2
·155-169
·
IF 0
Junfeng Li,Kwan San Hui,Shunping Ji,Chenyang Zha,Chengzong Yuan,Shuxing Wu,Feng Bin,Xi Fan,Fuming Chen,Zongping Shao,Kwun Nam Hui
Aluminum–metal batteries show great potential as next-generation energy storage due to their abundant resources and intrinsic safety. However, the crucial limitations of metallic Al anodes, such as dendrite and corrosion problems in conventional aluminum–metal batteries, remain challenging and elusive. Here, we report a novel electrodeposition strategy to prepare an optimized 3D Al anode on carbon cloth with an uniform deposition morphology, low local current density, and mitigatory volume change. The symmetrical cells with the 3D Al anode show superior stable cycling (>450 h) and low-voltage hysteresis (~170 mV) at 0.5 mA cm −2 . High reversibility (~99.7%) is achieved for the Al plating/stripping. The graphite | | Al-4/CC full batteries show a long lifespan of 800 cycles with 54 mAh g −1 capacity at a high current density of 1000 mA g −1 , benefiting from the high capacitive-controlled distribution. This study proposes a novel strategy to design 3D Al anodes for metallic-Al-based batteries by eliminating the problems of planar Al anodes and realizing the potential applications of aluminum–graphite batteries.
研究领域:
材料科学
·
能源存储技术
✓ 已验证
产品关联
DOI
SEPARATION AND PURIFICATION TECHNOLOGY
·
2021
·
IF 7.312
Beibei Liu,Baoyu Gao,Kangying Guo,Jingwen Pan,Qinyan Yue
Safe and effective coagulants are necessary for surface water treatment. The polyaluminum-titanium chloride (PATC) composite coagulant has promise but its application is limited due to the lack of fundamental theoretical research. We prepared a series of novel PATCs and investigated the effects of the interaction between Al (III) and Ti (IV) on the chemical species distribution, physicochemical properties and coagulation efficiencies. The Al-O-Ti bonds observed in the PATC infrared spectra were predicted by density functional theory computation to appear in 4-atom rings in the structure. The differences in Al species distribution of PATC and PAC illustrated that the introduction of Ti retarded the hydrolysis of monomeric Al species (Al a ) and medium polymerized Al species (Al b ) to colloidal Al species (Al c ) at low B levels, but the transformation was promoted at high basicities (B). PATCs exhibited higher charge densities and larger molecular weights than PAC at the same B levels, which contributed to their excellent coagulation efficiencies. PATC with low B values but high Al/Ti molar ratios mainly provided charge neutralization in removal of humic acid kaolin, while the dominant coagulation mechanism converted from charge neutralization to sweeping and bridging effects at high B values or low Al/Ti molar ratios.
研究领域:
环境科学
·
化学工程
✓ 已验证
产品关联
DOI
高影响因子
FUEL
·
2022
·
IF 8.035
Mengjiao Xing,Yunlei Chen,Jian Cao,Yuanlong Han,Zhichao Tao,Fei Wang,Kun Hao,Ling Zhang,Wentao Zheng,Hongwei Xiang,Yong Yang,Yongwang Li,Xiaodong Wen
Understanding the catalytic structure–activity relationship over active sites is of fundamental importance in heterogeneous catalysis field. Herein, a series of H-ZSM-5 zeolites with Al pairs contents in the range of 31% to 82% are used to explore the structure sensitivity of olefin aromatization reaction. Compared with high reaction temperatures (385 ℃ and above), prominently different initial aromatic yields are observed over the samples at 150 ℃. In addition, the 1-octene temperature-programmed surface reaction (TPSR) and theoretical calculation results give a thorough understanding on active site dependent activation temperature (100 vs 150 ℃ over Al pairs and single Al). However, the catalytic cycle of olefin aromatization is not sustainable at low reaction temperature, which is due to the formation and blocking of big molecules in the micropores (e.g., trimethylbenzene etc.). In conclusion, the desorption of big molecules is the rate-determining step for olefin aromatization reaction over H-ZSM-5, which masks the structure sensitivity over Al pairs and single Al.
研究领域:
催化化学
·
材料科学
✓ 已验证
产品关联
DOI
高影响因子
International Journal of Applied Ceramic Technology
·
2022
·Vol. 19
·期 5
·2675-2685
·
IF 2.328
Qingliang Shan,Qian Ma,Jiawei Lian,Caiyu Yao,Anze Shui
In this research, for studying the influence of size and heat treatment temperature of initial Al(OH) 3 on the physical properties of porous mullite ceramics, porous mullite ceramics were prepared by in situ reaction sintering of amorphous silica and treated Al(OH) 3 . The transition phases χ-Al 2 O 3 , к-Al 2 O 3 , and stable phase α-Al 2 O 3 can be obtained in turn when the treatment temperature of raw Al(OH) 3 is 500, 1000, and 1500°C, respectively. The coarser the raw Al(OH) 3 , the higher the strength of porous mullite ceramics. When the sintering temperature is 1500°C, the bending strengths of PS500-C, PS1000-C, and PS1500-C (PS x -C represents that the specimen was prepared by the coarse grade Al(OH) 3, which was previously treated at x °C) are 40.3 ± 2.1, 54.9 ± 5.2, and 64.8 ± 4.8 MPa, respectively. In addition, although the activated Al 2 O 3 can decrease the formation temperature (∼100°C) of porous mullite ceramics, the strength and density of porous mullite ceramics prepared by activated Al 2 O 3 will decrease at the same sintering temperature. It is believed that the increase of defects and pores during the phase transformation should be responsible for this phenomenon.
研究领域:
材料科学
·
陶瓷工程
✓ 已验证
DOI
高影响因子
CERAMICS INTERNATIONAL
·
2023
·
IF 5.2
Chonghe Xu,Lin Wang,Zhichao Yu,Pinghui Ge,Tingting Li,Xuetao Yue,Xinqiang Wang
This paper reports a facile electrospinning method to synthesize aluminosilicate fibers by using aluminum chloride hexahydrate as single aluminum precursor, which contains no harmful or hazardous chemicals in the precursor sol. The results of Fourier transform infrared, X-ray diffraction, simultaneous thermogravimetry and differential scanning calorimetry show that the sols are diphasic. The thermal decomposition behavior, crystallization process and microstructure of the fibers are discussed in detail. The main components of aluminosilicate fibers heat-treated at 1200 °C are mullite (Al 6 Si 2 O 13 ), alumina (α-Al 2 O 3 ) and amorphous silica , while the alumina phase disappears when the molar ratio of Si to Al is below 1.5. The diameter and microstructure of fibers with different Si/Al molar ratios are obviously different, which is related to the large difference in conductivity of spinning sols. Bulk fibers and fibrous mats with good flexibility can be easily obtained by using alternative collectors. The tensile strength of the fibrous mats can reach 2.63 MPa and 1.52 MPa after heat-treated at 1000 °C and 1200 °C, respectively. The aluminosilicate fibers fabricated in this work has a noticeable potential in high temperature fields and related applications.
研究领域:
材料科学
·
化学工程
✓ 已验证
产品关联
DOI
高影响因子
CHEMICAL ENGINEERING RESEARCH & DESIGN
·
2025
·
IF 3.9
Guibiao He,Jian Li,Yaning Li,Saichao Song,Mingshuai Xue,Boliang Wang
Aluminum (Al) particles have been extensively filled into conventional liquid and solid fuels to improve energy density. However, introducing these particles will modify the rheological properties of hydrocarbon-based gel fuels (GFs). A comprehensive understanding the nonlinear rheological behaviors of GFs is essential, because the utilization of GFs often involves large deformation. In this study, the effects of flake and spherical aluminum (FAl and SAl) particles on the nonlinear responses of hydrocarbon-based GFs were investigated by large amplitude oscillatory shear (LAOS) at different frequencies. The solid-liquid transition behavior was characterized by Lissajous-Bowditch (L-B) curves and Fourier Transform-rheology. Stress sweep results revealed that GFs containing FAl particles exhibited significant viscoelastic characteristics than GFs containing SAl particles. The L-B curves demonstrsted that increasing the SAl particles content slowed transition from linear to nonlinear response, whereas higher FAl particles concentration accelerated this transition. Based on the stress softening ratio (R) and shear thinning ratio (Q), GFs containing FAl particles showed more significant stress stiffening and shear thickening than GFs with SAl particles as aluminum particles content increased. The higher harmonics ratio indicated that nonlinear responses were intensified with increasing FAl particles concentration. while this trend was reversed in GFs containing SAl particles.
研究领域:
流变学
·
能源材料
·
胶体与界面科学
·
推进剂化学
·
功能复合材料
✓ 已验证
DOI
高影响因子
APPLIED SURFACE SCIENCE
·
2025
·
IF 6.9
Jing Zhang,Qinfu Liu,Mingyi Huang
Halloysite is a natural aluminum-rich nano-sized clay mineral, which can offer the aluminum source to synthesize aluminum nitride (AlN) in a low-cost and environmentally friendly manner. The micron-sized AlN with different morphology and structure, including self-assembled pine-like aggregates, hollow bayberry-like spheres, and high aspect ratio whiskers, were successfully synthesized at 700 °C under nitrogen atmosphere using natural hydrated halloysite (10 Å HNT). These three kinds of varying morphological AlN formed by different mechanism. The self-assembled-AIN pine-like aggregates formed by in-situ nitrogen substitution within the Al-O octahedra of 10 Å HNT thermal fragmentation through self-assembly. The formation of the bayberry-like hollow spheres is governed by a gas–liquid reaction pathway, whereas the development of whiskers with a high length-to-diameter ratio is driven by a gas–liquid-solid mechanism. The morphological comparison of AlN synthesized from 10 Å HNT with 7 Å HNT further confirms the validity of the in-situ substitution mechanism we previously proposed, as well as reflecting the critical influence of halloysite hydration state on structural evolution of AlN. This study offers a new insight into tailoring AlN nanostructures using clay mineral templates, with promising applications in thermally conductive composites and electronic packaging materials.
研究领域:
材料科学
·
无机非金属材料
·
纳米结构材料
·
陶瓷材料
·
复合材料
✓ 已验证
DOI
高影响因子
CERAMICS INTERNATIONAL
·
2021
·
IF 4.527
Liu Guo,Xiaoyu Wang,Ye Li,Yuandong Mu,Quanli Jia,Gang Wang,Liugang Chen
To improve the properties of high alumina castables containing calcium aluminate cement (CAC) after firing at elevated temperatures, micro-sized basic zinc carbonate (BZC) was introduced as ZnO-based nano fragments into castables. To account for the influence of BZC on the evolution of castable properties, the phase composition and microstructure of castable matrices were examined with X-ray diffraction and scanning electron microscopy equipped with energy dispersive spectroscopy, respectively. Properties of castables having BZC were compared with those with Zn(OH) 2 . Results show that strength of castables added with BZC after firing at both medium temperatures and 1550 °C was improved. The volume stability and hot modulus of rupture at 1550 °C of fired castables containing BZC were also enhanced.
研究领域:
材料科学
·
无机非金属材料
✓ 已验证
DOI
高影响因子
Ceramics-Switzerland
·
2025
·Vol. 8
·期 1
·27
·
IF 2
Haining Geng,Qi Wei,Haosen Ma,Qiu Li
The expansion, cracking and deterioration of properties during utilisation and solidification of municipal solid waste incineration bottom ash are key problems that are caused by the reaction of metallic aluminium in the bottom ash in the highly alkaline environment of hardened Portland cement. In this study, polyaluminium sulphate (PAS) was introduced into ordinary Portland cement (OPC) to inhibit the corrosion of aluminium alloy. The results indicate that PAS successfully inhibited the corrosion of Al in hardened OPC paste, prevented the expansion and cracking, reduced the amount of hydrogen gas release and formed a thinner and dense corrosion layer on the Al plate surface. The mechanism of corrosion inhibition of Al by PAS was the increase of initial Al(OH)4−concentration by hydrolysis, which expanded the pH range of passivation and transformed the porous loose bayerite layer to a dense homogeneous one around the Al plate without modification of the corrosion product (bayerite). The corrosion rate of the Al alloy in hardened OPC paste was reduced by 213 times by the addition of PAS, from 288.30 mm a−1without PAS addition to 1.35 mm a−1with PAS addition. This study casts light on the effective inhibition of corrosion of the Al alloy in OPC.
研究领域:
材料科学
·
化学工程
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF ENVIRONMENTAL MANAGEMENT
·
2025
·
IF 8.4
Teng Zhang,Jingmin Yan,Zhengchen Li,Hongyang Wang,Peiwei Han,Shufeng Ye
Red mud (RM) is a strongly alkaline solid waste produced during the production of alumina from bauxite. China's RM stockpile exceeds 1 billion tons, with an annual output of over 100 million tons. However, the comprehensive utilization percentage is less than 10%, and the rest are stored around alumina plants, which are severely burdening land and the surrounding environment. This study proposes a combined roasting process, which combines soda roasting with medium-temperature magnetization roasting, to synchronously convert minerals in RM into magnetite and soluble aluminate, to achieve the goals of iron concentrate upgrading and aluminum recovery. Iron concentrate with of yield of 72.52 wt%, total iron (TFe) concentration of 63.84 wt%, iron recovery of 93.47 wt%, and aluminum concentration of 2.53 wt%, and the aluminum product with the Al 2 O 3 concentration of 99.49 wt% were obtained under the optimized process parameters. Four pathways to iron concentrate upgrading that reduce the aluminum concentration during combined roasting are proposed based on the non-isothermal kinetic analysis and phase evolution results. These results can provide theoretical support for the comprehensive utilization of iron and aluminum in RM.
研究领域:
冶金工程
·
环境科学
✓ 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）