JOURNAL OF SOLID STATE CHEMISTRY
·
2023
·
IF 3.3
Jia Luo,Yuqing Luo,Jun Tan,Hongsheng Che,Ting He,Jiugang Hu
The large-scale and controllable production of boehmite has attached much attention due to its extensive application in advanced energy and electronics industries. In this study, a facile vaporthermal (VPH) method was developed for the rapid fabrication of rhombic boehmite microflakes using low-cost commercial gibbsite particles. The evolution behaviors of gibbsite to boehmite under VPH and conventional hydrothermal (LPH) conditions were ex-situ monitored by XRD , Raman, and FT-IR techniques. The boehmite powders from VPH (V-boehmite) and LPH (L-boehmite) have similar crystal structure and bonding vibration information, whereas V-boehmite exhibits rhombic morphology and L-boehmite presents cubic morphology. Moreover, the formation time of boehmite can be shortened from 16 h of LPH to 6 h of VPH at 180 °C, which significantly contributes to its scalable production. These differences of V-boehmite are attributed to the direct contact between high-temperature saturated water steam and gibbsite, which can induce the rapid formation of rhombic boehmite microflakes through dissolution-recrystallization mechanism. Therefore, the vaporthermal technology has great potential for efficient, sustainable, and large-scale production of boehmite powders.
研究领域:
材料科学
·
能源技术
✓ 已验证
产品关联
DOI
高影响因子
CERAMICS INTERNATIONAL
·
2022
·
IF 5.532
Fei He,Wenjie Li,Tianliang Pang,Liang Zhou,Chen Wang,Hang Liu,Mingwei Li,Xiaodong He
Boehmite nanorods (BNRs) were synthesized via the sol-gel process and hydrothermal method from alumina sols. Four influence factors, i.e. hydrothermal temperature and time, acetic acid contents, alcohol contents and stirring patterns, were explored to understand the reasons of BNRs growth. Scanning electron microscopy (SEM), transmission electron microscope (TEM), Fourier transform infrared (FT-IR) spectra and X-ray diffraction (XRD) were used to investigate the micromorphology, functional groups and phase composites of BNRs. The results show that the hydrothermal temperature and the contents of acetic acid play important parts in the one-dimension (1D) growth of BNRs. However, the hydrothermal time and the contents of alcohol have little effects. The growth mechanism of BNRs is related to the formation, growth and directional assembling of boehmite crystallites . After the simulation of dissipative particle dynamics (DPD), the increase of shear rate is beneficial to the 1D growth of BNRs.
研究领域:
材料科学
·
纳米技术
✓ 已验证
产品关联
DOI
高影响因子
ChemistrySelect
·
2024
·Vol. 9
·期 32
·e202401140
·
IF 1.9
Yuanxin Man,Hui Nan,Jianzhe Ma,Zhike Li,Xianlan Wang,Pan Yang,Caihong Xue,Jingyuan Zhou,Heqi Li
Graphical Polyethylene glycol 10000 (PEG-10000) was selected as a dispersant for γ-AlOOH nanowhiskers in the PE coating slurry. The AlOOH-PEG/PE separator maintains its structural integrity even after a 0.5 hour test at 200 degrees Celsius, and lithium-ion battery half-cells assembled with it exhibited a capacity of 73.9 % at a 5 C rate. In this study, a γ-boehmite (γ-AlOOH) – PEG/polyethylene (PE) lithium-ion battery separator was fabricated using a dip-coating method, with γ-AlOOH nanowhiskers being synthesized directly through a hydrothermal process,and polyethylene glycol 10000 (PEG-10000) was chosen for the first time as a dispersant for the γ-AlOOH nanowhiskers in the PE coating slurry{Lee, 2014 #7}. Simultaneously, the membrane's performance was characterized, confirming the significant dispersion effect of PEG-10000, resulting in a porosity as high as 64 % in the AlOOH-PEG/PE, a substantial increase compared to the PE separator (40 %). The AlOOH-PEG/PE separator maintains its structural integrity even after a 0.5 h test at 200 °C, showcasing outstanding stability and significantly improved safety. Besides, the LIB half cells assembled with the PE/AlOOH-PEG separator exhibited remarkable performance, with a capacity of 73.9 % in power capability (at 5 C rate) and a 97.1 % discharge capacity retention rates in cycle performance (after 400 cycles, at 2 C rate). Furthermore, lithium iron phosphate (LiFePO 4 ) batteries utilizing the AlOOH-PEG/PE separator demonstrated significantly enhanced cycling stability and rate capacity.
研究领域:
材料科学
·
能源技术
✓ 已验证
产品关联
DOI
高影响因子
CERAMICS INTERNATIONAL
·
2020
·
IF 3.83
Yuan Wang,Qiulin Wang,Xiuqin Wei,Zhenglin Song,Yu Lan,Wenjun Luo,Chuanqiang Yin,Zhihao Yue,Lang Zhou,Xiaomin Li
In this study, a novel boehmite (AlOOH) nanowhiskers/polyethylene (PE) separator was initially prepared by the AlOOH nanowhiskers coating on the commercial PE separator using dip-coating method, in which the AlOOH nanowhiskers were directly synthetized by a facile hydrothermal method . It is shown that the needle-like AlOOH nanowhiskers with the rough surfaces have been successfully obtained. Meanwhile, according to the performance characterization of separators, the AlOOH nanowhiskers/PE separator exhibits higher porosities of 60.1% and excellent mechanical properties with the tensile strength of 145.1 MPa and the elongation of 130.1%, owing to the integrally three-dimensional (3D) structure of AlOOH nanowhiskers coating layer. Also, benefiting from the spindly and rough surficial morphology of AlOOH nanowhiskers, the PE separator coating with AlOOH nanowhiskers has a smaller contact angle of 8.6° and higher electrolyte uptake of 173.1% than that coating with AlOOH nanoparticles . As expected, the LiFePO 4 /Li cell with AlOOH nanowhiskers/PE separator presents superior cycle stability and rate capacity. Then the SEM images of the lithium metal anode , disassembled from the cell with AlOOH nanowhiskers/PE separator after 200 cycles, show that the 3D structure of AlOOH nanowhiskers layer can suppress the growth of lithium dendrites .
研究领域:
材料科学
·
能源存储技术
✓ 已验证
DOI
高影响因子
RSC Advances
·
2020
·Vol. 10
·期 46
·27492-27501
·
IF 3.119
Xiang Li,Shilin Chen,Zilong Xia,Li Li,Wenhui Yuan
In this study, a novel boehmite/polyacrylonitrile (BM/PAN) composite nanofiber membrane was prepared using the electrospinning technique. The physical and electrochemical properties of different contents of BM/PAN composite nanofiber membranes were investigated as separators for lithium ion batteries (LIBs). Compared to the commercial polypropylene (PP) separator, the experimental results show that the BM/PAN composite nanofiber separator possesses a unique three-dimensional (3D) interconnected structure and exhibits higher porosity, greater electrolyte up-take, higher thermal stability and better electrochemical performance in a LiCoO2/Li cell. Besides, batteries containing 30 wt% BM/PAN membranes display the highest ionic conductivity (2.85 mS cm−1), widest electrochemical stability window (5.5 V vs. Li+/Li), leading to the highest initial discharge capacity (162 mA h g−1) and the largest capacity retention ratio (90.7%) at 0.5C after 100 cycles. These findings reveal that the BM/PAN composite nanofiber membranes are promising candidates as commercial separators for high performance LIBs.
研究领域:
材料科学
·
电化学
·
纳米技术
·
能源存储
·
高分子科学
·
电池技术
✓ 已验证
DOI
高影响因子
CERAMICS INTERNATIONAL
·
2020
·Vol. 46
·期 7
·9289-9296
·
IF 3.83
Mohamed S. Selim,Ping Jing Mo,Yu Ping Zhang,Zhifeng Hao,Hongli Wen
Ceramic one-dimensional particles are fascinating nanomaterials for sustainable future industries. Nanorods of γ-Al 2 O 3 with single crystallinity and 10 nm diameter regime were newly developed through solvothermal procedure between AlCl 3 ·6H 2 O, NaOH, and sodium dodecylbenzene sulfonate at 200 °C for 24 h. Controlling the pH values, reaction time, temperature, and effect of surfactant during the solvothermal reaction was studied to control the morphology and structure of nanorods. The solvothermal procedure for preparing γ-AlOOH nanorods followed lamellar growth, assembly, and ripening routes. The γ-AlOOH nanorods were converted to γ-Al 2 O 3 through calcination reaction at 500 °C for 3 h. The produced γ-Al 2 O 3 nanorods were 10 nm average width, 100–200 nm average length, and exposed with [101] orientation and a linear structure. FTIR, HRTEM , FESEM, XRD , and X-ray photoelectron spectroscopy methods were used for characterizing the prepared nanomaterials . New features and applied fields are predictable for the designed γ-AlOOH and γ-Al 2 O 3 nanorods.
研究领域:
无机化学
·
纳米材料科学
·
溶剂热合成
·
陶瓷纳米材料
·
材料化学
✓ 已验证
DOI
高影响因子
ACS Earth and Space Chemistry
·
2022
·
IF 3.556
Shangying Li,Hongping He,Qi Tao,Peixin Du,Aiqing Chen,Yilin He,Jianxi Zhu
2:1 type layered aluminosilicates (LAs) such as beidellite, montmorillonite, and paragonite distribute widely in the various environments of the Earth, and they form commonly through the transformation of other minerals under hydrothermal or weathering conditions. Understanding the growth mechanisms of 2:1 type LAs during mineral transformation is of great importance for profoundly revealing their formation processes in the geological environments and a better understanding of the formation of crystal defects within minerals, however, which is not thoroughly revealed. In this study, the transformation of boehmite into 2:1 type LAs was successfully realized under hydrothermal conditions, and the growth mechanisms of 2:1 type LAs during such a mineral transformation were explored using spectroscopic and microscopic characterizations. The results indicated that layers of 2:1 type LAs preferentially extend in the a–b plane at the initial transformation stage and stack along the c-axis with the transformation proceeding. Additionally, some small primary nanoparticles of 2:1 type LAs occasionally attached to each other along the c-axis or in the a–b plane. This revealed that 2:1 type LAs that formed at the interfaces between precursor boehmite and additional amorphous Si mainly grew through the layer growth mechanism occasionally accompanied by the oriented attachment.
研究领域:
地质学
·
矿物学
✓ 已验证
产品关联
DOI
高影响因子
ACS Applied Energy Materials
·
2026
·
IF 5.5
Hailong Feng,Siyu Jin,Feiyang Cheng,Ming Ruan,Xiaodong Zhu,Deren Yang,Lei Wang
Current crystalline silicon (c-Si) solar cells typically employ pyramidal texturing and a silicon nitride (SiNx) film to suppress light reflection and improve the power conversion efficiency (PCE). However, appreciable reflection persists at both short and long wavelengths, indicating that further optical optimization is possible. Here, we introduce a boehmite nanosheet layer onto c-Si solar cells by leveraging the refractive index mismatch at the SiNx/air interface. Together with the pyramidal texture, the nanosheets form a micronano-composite structure with a graded refractive index. This architecture reduces the weighted-average reflectivity (300–1100 nm) from 4.66% to 3.80%, increases the short-circuit current density by 0.26 mA cm–2, and improves the PCE by 0.18%. The method provides a low-cost route to add an auxiliary antireflection layer to existing c-Si architectures, enhancing both short- and long-wavelength responses and potentially extending to other solar-cell technologies.
✓ 已验证
产品关联
DOI
高影响因子
CERAMICS INTERNATIONAL
·
2019
·
IF 3.45
Xiaoqin Yin,Jianqing Wu,Peng Gao,Kang Guan,Cheng Peng
Precursor film method was used to prepare highly permeable ceramic microfiltration membranes in this work. The performance of alumina microfiltration membranes was improved by adding boehmite sol in the membrane precursor film. With increasing the boehmite sol content, the effective average pore size of the membrane was continuously decreased and the separation efficiency of the membrane was increased. These improvements were due to that the boehmite sol not only helped the dispersion of the α-Al 2 O 3 powder in the membrane forming slurry, but also formed γ-Al 2 O 3 in the gaps among the existed α-Al 2 O 3 particles which was beneficial for membrane sintering and pore size decreasing. For the membrane prepared with 45 wt% boehmite sol, the effective average filtration pore diameter was 178 nm and the water permeance of the membrane reached 1691 Lm −2 h −1 bar −1 , which was much better than the values reported before. Moreover, the reusability of the membrane was confirmed using a recycling test.
研究领域:
材料科学
·
环境工程
✓ 已验证
DOI
高影响因子
JOURNAL OF SOL-GEL SCIENCE AND TECHNOLOGY
·
2014
·Vol. 70
·期 1
·72-80
·
IF 1.547
Zhao Zhihua,Shen Xiaoqing,Yao Hongchang,Wang Jianshe,Chen Jinzhou,Li Zhongjun
Alumina nanofibers were fabricated by calcination of the polyvinylpyrrolidone (PVP)/pseudo-boehmite nanocomposite precursor fibers formed by electrospinning PVP/ethanol solution of dispersed pseudo-boehmite nanoparticles with and without additive of silica. The evolution of the phase, mechanical property and morphological features of the calcined fibers were studied and the effect of adding SiO 2 on the phase transformation of alumina was discussed. Adding SiO 2 can retard the phase transformation of γ-Al 2 O 3 to α-Al 2 O 3 and therefore inhibit the growth of alumina grains during calcination. Upon calcining the precursor fibers with 4 wt% SiO 2 additive at 1,300 °C, continuous alumina nanofibers with diameter ranging from 300 to 800 nm were obtained. These continuous nanofibers exhibited good flexibility and could be very promising for applications in filtration and catalyst support.
研究领域:
材料科学
·
纳米技术
✓ 已验证
DOI
高影响因子
JOURNAL OF THE AMERICAN CERAMIC SOCIETY
·
2020
·Vol. 104
·期 4
·1902-1907
·
IF 3.502
Yu Zheng,Xudong Luo,Jiegang You,Ting Li,Qingdong Hou
Ceramic foam materials with highly porous microstructure are playing vital role in increasing areas, especially for those with requirements for open channels and superior specific surface area. In this work, a simple and versatile approach to prepare ceramic foams with open pores has been proposed, that is gelation of boehmite nanoparticle-assembled emulsions. Notably, hierarchical porous microstructure with open channels and uniform pore structure has been built. High specific surface area up to389.4 m 2 /g is attainable, making it excellent adsorption material when combining the merit of hierarchical pore structure. Furthermore, lattice-shaped ceramics are prepared via direct ink writing gelled emulsion, displaying the potential of forming lightweight material with complex shape and designable macrostructure. The three-dimensional (3D) printed foams exhibit multiple open pores, which cover length scale from mm scale, to μm scale and nm scale, making them promising materials in several fields like adsorption and gas filtrations, etc.
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 POLYMER ENGINEERING
·
2022
·Vol. 42
·期 5
·428-435
·
IF 1.624
Hongda Zhang,Hong Zhou,Jing Ge,Guolong Liu,Xuesong Tu,Liguo Jin
Graphene oxide (GO) was prepared by improved Hummer’s method, and the boehmite nanorods (AlOOH) were obtained by hydrothermal synthesis. Hybrid fillers were acquired of the surface-modified boehmite ( m AlOOH) nanorods attached on GO nanoplatelets ( m AlOOH-GO), then the hybrids were added into epoxy matrix. Both mechanical and thermal properties of the epoxy resin composites were increased through the addition of m AlOOH-GO hybrid fillers. The dispersion was promoted of GO because of introduction of m AlOOH, and the roughness of GO surfaces were increased by appropriate m AlOOH nano-rods, which this allows for a better interfacial formation between EP and hybrid fillers. Thus, remarkable enhancement on impact and flexural strength were achieved by introduction of A3G03 (3 wt% m AlOOH and 0.3 wt% GO), and the yielded enhancements are 302.6 and 46.4%, respectively. In addition, the thermal conductivity increases to 0.264 W m −1 K −1 and the thermal stability is significantly improved.
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
危险品化学品经营许可证（带存储）