COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
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2025
·
IF 5.4
Yeming Huang,Jingxuan Zhang,Renhong Wang,Bing Gao,Ruyi Miao,Sirun Zhang,Dunju Wang
Improving the energy release efficiency of aluminium powders in weaponry is essential. In this study, uniform core-shell Al@(PFDTES/GAP) was prepared by hydrolyzing PFDTES and co-reacting it with GAP on aluminum powder. It showed better thermal reaction, combustion and energy release. The thermal properties of Al@(PFDTES/GAP) exhibit a significant aluminum-fluorine exothermic phenomenon in DSC, with a 4.9 % increase in exothermic heat in the combustion test compared to raw-Al. For the samples blended with PTFE, Al@(PFDTES/GAP)/PTFE demonstrated excellent performance in terms of increased heat release (increased by 28.0 %) in DSC, higher heat release (increased by 10.2 %) in the heat of combustion test, larger combustion flame area and faster combustion speed (the time reduced by 20.0 %) in the air, compared with that of raw-Al/PTFE. In conclusion, this method is simple and effective to enhance the energy release of aluminium powder, which is of great significance for improving the energy of weapons and equipment.
研究领域:
材料科学
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能源工程
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产品关联
DOI
高影响因子
Journal of Environmental Chemical Engineering
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2022
·
IF 7.968
Xinyu Yao,Xianbo Hou,Guocheng Qi,Rubing Zhang
Super-wetting fibrous membranes have been widely researched for the separation of oil-water mixtures and light oil-water emulsions. However, reusable oil-water separation membranes for heavy oil with high viscosity and high density have proved to be extremely challenging. Herein, superhydrophobic, flexible, and foldable polyimide (PI) nanofiber membranes for heavy oil separation were prepared by using electrospinning method combined with surface modification to build a stable nano-scale roughness on the fiber surface. The results demonstrated that the fibrous membranes modified by fumed silica and 1H, 1H, 2H, 2H-perfluorooctyl trichlorosilane(PFTS) not only had excellent mechanical robustness, but also achieved both ultra-high oil-water selectivity and separation performance. The as-prepared PI fibrous membranes showed the ultra-high gravity-driven light/oil-water emulsion separation flux of 3904.7 L m −2 h −1 and 22474.7 L m −2 h −1 with and without emulsifier stabilization, and the flux of heavy oil can reached 271.36 L m −2 h −1 under 25KPa. The mechanically robust and reusable PI fibrous membranes with high efficient oil-water emulsion and heavy oil separation performance exhibit great potential for practical applications for oily wastewater and oil spill treatment.
研究领域:
材料科学
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环境工程
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化学工程
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纳米技术
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DOI
高影响因子
Journal of Cleaner Production
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2020
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IF 7.246
Pan Zhang,Yuanyuan Cui,Kaiqiang Zhang,Sainan Wu,Dongchu Chen,Yanfeng Gao
The inherent leakage of molten paraffin during the solid-liquid transition and the immature state of industrial technology currently limit its practical applications for temperature regulation in smart energy-saving buildings. Here, a 1H, 1H, 2H, 2H-perfluorodecyltriethoxysilane modification of diatomite with an oleophobic surface was used as a supporting material of molten paraffin for enhancing thermal storage capacity of paraffin/diatomite composite. The results show that an optimal encapsulation ratio of the paraffin/diatomite composite is up to 84.5%, with excellent thermal reliability after a 50-cycle of melting and freezing. The simulation test demonstrates that the indoor temperature is reduced by 5.3 °C in a phase change material room with the paraffin/diatomite composite window as compared to that of an ordinary simulation room. Diatomite with oleophobic surface as a molten paraffin supporting material is effective in improving the thermal storage capacity of the composite. The paraffin/diatomite composite is a potential material with the applications in energy-saving buildings.
研究领域:
材料科学
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能源工程
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建筑技术
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产品关联
DOI
高影响因子
APPLIED SURFACE SCIENCE
·
2020
·
IF 6.182
Yi Wang,Xinyan Xiao,Jiayi Chen,Mingli Lu,Xingye Zeng
An ordered 1T/2H MoSe 2 possessed few-layers nanosheets structure was synthesized by a NaBH 4 -assisted hydrothermal method. Further, 1T/2H MoSe 2 was integrated with proton g-C 3 N 4 via solvothermal method, forming a novel 2D/2D heterostructure composite (1T/2H MoSe 2 /pg-C 3 N 4 ) with Z-scheme heterojunction. 1T/2H MoSe 2 /pg-C 3 N 4 had narrower bandgap, abundant active sites, as well as better photocurrent response and conductivity, confirmed by spectroscopic and electrochemical characterizations. Consequently, the optimal 1T/2H MoSe 2 /pg-C 3 N 4 at 1 wt% MoSe 2 loading showed enhanced TC (RhB) photodegrading rate of 92% (99%), within 80 min (45 min) of simulated solar light irradiation, being 3.0 (3.4) and 1.2 (1.2) times than that of pg-C 3 N 4 and 2H MoSe 2 /pg-C 3 N 4 , respectively. Additionally, active species trapping experiments indicated that O 2 − and h + were the main species of contaminants degradation over 1T/2H MoSe 2 /pg-C 3 N 4 . Combining with DRS, Mott-Schottky and VB XPS analysis, a reasonable 1T phase boosted Z-scheme MoSe 2 -based heterojunction mechanism was proposed.
研究领域:
材料科学
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环境科学
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光催化
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DOI
高影响因子
VACUUM
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2022
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IF 4.11
Jiashuo Yan,Shuang Lian,Zhigang Cao,Yadan Du,Ping Wu,Huijuan Sun,Yukai An
In this work, tungsten disulfide (WS 2 ) nanosheets with good morphology are prepared by improved chemical vapor deposition (CVD) using a mixture of transition metal oxides and chalcogenide as precursors. By optimizing the growth conditions, the high-quality WS 2 nanosheets with different morphologies, including large triangular, hexagonal, small triangular, terraced and spiral structures are obtained as the growth temperature of 850 °C, Ar gas flow rate of 50 sccm and holding time for 15 min. The detailed structural analyses by XRD , XPS , TEM and Raman measurements suggest that that the deposited WS 2 nanosheets exhibit the 2H phase structure with high crystallization quality and uniform distribution of W and S elements. The formation of large triangular, hexagonal, and small triangular structures is related to the growth rate of different crystal planes of S atoms or W atoms. In addition, the formation of terraced and spiral stacking structures originates from the difference of supersaturation of precursors, which can be explained by the layer-by-layer stacking (LBL) growth and the spiral-dislocation-driven (SDD) mechanisms, respectively.
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DOI
高影响因子
Nanoscale
·
2021
·Vol. 13
·期 43
·18103-18111
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IF 7.79
Hanjun Jiang,Lu Zheng,Jing Wang,Manzhang Xu,Xuetao Gan,Xuewen Wang,Wei Huang
Two-dimensional (2D) layered transition metal dichalcogenides (TMDs) have received much attention in nonlinear optical applications due to their unique crystal structures and second harmonic generation (SHG) efficiency. However, SHG signals in TMDs show a layer-dependent behavior, consistent with the presence (absence) of inversion symmetry in even-layer (odd-layer) of TMDs. Herein, we synthesized monolayer and bilayer 2H and 3R phase vanadium (V)-doped MoS2 crystal. Raman spectroscopy, XPS, and STEM were used to identify the chemical composition and crystalline structure of as-grown nanoflakes. SHG measurement was used to research the symmetry of V-doped MoS2 crystals with different stacking orders. Significantly, the SHG efficiency in bilayer 2H phase V-doped MoS2 is equivalent to the 3R phase, indicating an inversion symmetry broken lattice structure caused by the in situ V substitute for Mo sites. This study will be conducive to promote the development of promising nonlinear optical devices based on 2D material.
研究领域:
材料科学
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非线性光学
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纳米技术
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凝聚态物理
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DOI
高影响因子
CERAMICS INTERNATIONAL
·
2025
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IF 5.6
Zhuotao Song,Zhixiao Wang,Tao Yang,Yanglong Hou,Enhui Wang,Hongyang Wang,Kuo-Chih Chou,Xinmei Hou
Silicon carbide (SiC), recognized as a high-quality dielectric material, stands out as a promising candidate for wave-absorbing applications. Nevertheless, at room temperature, SiC often suffers from suboptimal impedance matching and loss coefficients, resulting in inferior wave-absorbing performance. In response to this challenge, we synthesized polymer-derived ceramics (PDCs)-SiC fibers rich in heterojunctions and turbostratic carbon. This was achieved by incorporating cobalt (Co) catalysts into the organopolysilazane spinning precursor, followed by high-temperature pyrolysis. We systematically investigated the influence of Co catalyst content and pyrolysis temperature on the electromagnetic absorption (EMA) properties of PDCs-SiC and elucidated the underlying wave-absorption mechanism. Our findings reveal that the introduction of an appropriate quantity of Co catalyst not only effectively reduces the temperature required for the conversion of organopolysilazanes into SiC but also facilitates the growth of 2H-SiC and a substantial amount of turbostratic carbon within the fibers. This unique structure serves to enhance the conductivity loss and simultaneously generates an abundance of interfaces and dipole polarization. The fabricated mesoporous 2H/3C-SiC heterojunction fibers exhibit outstanding wave-absorbing capabilities. Specifically, at a thickness of 1.4 mm, they achieve a minimum reflection loss (RL min ) of −53.93 dB, and at a thickness of 1.6 mm, they possess an effective absorption bandwidth (EAB) of 3.21 GHz. Moreover, the EAB can be precisely regulated by adjusting the Co content. This work offers innovative perspectives for the subsequent design of novel wave-absorbing materials with enhanced absorption capacity.
研究领域:
材料科学
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电磁学
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产品关联
DOI
高影响因子
Membranes
·
2022
·Vol. 12
·期 12
·1188
·
IF 4.562
Yu-Ping Zhang,Ning Wang,De-Liang Chen,Yuan Chen,Meng-Jun Chen,Xin-Xin Chen
Water/oil separation from their mixture and emulsion has been a prominent topic in fundamental research and in practical applications. In this work, a smart superhydrophobic membrane (SHP) was obtained by dipping an off-the-shelf laboratory filter paper in an ethanol suspension of trichloro (1H,1H,2H,2H-tridecafluoro-n-octyl) silane, tetraethyl orthosilicate, and titanium dioxide nanoparticles with different dimensions of 20 and 100 nm. The selection of membrane substrates was optimized including different quantitative and quantitative filter papers with different filtration velocity (slow, intermediate, and fast). The as-prepared SHP was demonstrated to be superhydrophobic and photosensitive, which was used in the separation of carbon tetrachloride and water from their mixture and emulsion. Moreover, orderly aligned micropores were formed for the modified superhydrophobic filter papers by using nanosecond laser. Unidirectional penetration was obtained for the UV-irradiated paper with a bored pore in the range of 50–500 μm in the systems of air/water and water/oil. This study may promote the understanding of unidirectional transportation of liquid droplet and facilitate the design of interfacial materials with Janus-type wettability.Keywords:superhydrophobic filter paper;Janus membranes;dip coating;emulation separation;nanosecond laser
研究领域:
材料科学
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环境工程
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化学工程
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纳米技术
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产品关联
DOI
PubMed
高影响因子
RSC Advances
·
2023
·Vol. 13
·期 50
·35689-35694
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IF 3.9
Huandi Hou,Ting Wang,Baohuan Wang,Wenting Guo,Xiang Miao,Xin Liang
Co–Mo–S based catalysts have promising applications in both the hydrogen evolution reaction (HER) and hydrodesulfurization (HDS). Herein, Co–Mo–S catalyst and Co–Mo–S catalyst with and without NaBH4 modification have been successfully synthesized by a simple hydrothermal synthesis method. Co–Mo–S catalysts with NaBH4 modification show better catalytic activity towards both HDS and the HER. The phase purity, morphology, crystal structures and electron valence distribution of the catalysts with and without NaBH4 modification were studied by experimental characterizations and theoretical calculations. The catalysts without NaBH4 modification are mostly 2H-MoS2, while the catalysts without NaBH4 modification have 1T-MoS2, and 1T-MoS2 is exposed to more active sites, which will be conducive to the results of HDS performance of the catalyst. DFT calculations investigated the required activation energies of 1T-MoS2 and 2H-MoS2 for HDS and HER, respectively. The activation energy required for both HDS and H2 generation of 1T-MoS2 is significantly lower than that for the 2H-MoS2 structure.
研究领域:
催化化学
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材料科学
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理论计算
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产品关联
DOI
PubMed
高影响因子
MATERIALS LETTERS
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2022
·
IF 3.574
Yu Liu,Gan Yuan,Chunlei Guo,Chi-Vinh Ngo,Wei Li
Ethylene glycol (EG) is widely used as a cooling agent in factories, aviation, and automobiles. However, its corrosive nature can create significant damage and reduce the life cycle of devices. This paper compares three different methods to achieve the superhydrophobic anti-corrosion aluminum surfaces for working in an engine coolant environment. The methods are combinations between femtosecond laser fabrication and chemical coatings using Polydimethylsiloxane (PDMS) and Triethoxy-1H,1H,2H,2H-tridecafluoro-n-octylsilane (TTFOS). All the samples show superhydrophobicity with contact angles greater than 150°, and sliding angles smaller than 10°. The superhydrophobic surface (SHS) show the best corrosion rate up to three orders of magnitude compared to flat surfaces when working in an engine coolant environment. Moreover, corrosion inhibition efficiencies of the fabricated surfaces impress the best results greater than 98%. The anti-corrosion behavior of the SHS is explained. After comparing the performances of the surfaces fabricated by three methods, the most suitable method is proposed to produce anti-corrosion aluminum surfaces for applications using engine coolant as an environment.
研究领域:
材料科学
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表面工程
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腐蚀科学
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化学工程
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产品关联
DOI
高影响因子
MATERIALS LETTERS
·
2025
·
IF 2.7
Ying Chen,Chang Liu,Mengxue Hu,Qingfang Li,Jing Su
In this work, KCuCl₃ and K₂CuCl₄·2H₂O crystals were synthesized via a solution evaporation method. Their crystal structures were verified by XRD, while the (110) interplanar spacing of K₂CuCl₄·2H₂O was further identified by HRTEM and the corresponding SAED. Thermal behavior was examined using TG/DSC. Both compounds exhibit reversible discoloration in response to temperature (20–100 °C) and humidity (0–80 % RH). UV–Vis absorption reveals band gaps of 3.05 eV for KCuCl₃ and 3.09 eV for K₂CuCl₄·2H₂O. PL spectra show blue-green emission, with CIE coordinates indicating a warmer hue for K₂CuCl₄·2H₂O, primarily attributed to the Cu 2+ centers. The strong light absorption and efficient PL response of these halides highlight their potential for humidity sensing and luminescent device applications.
研究领域:
材料科学
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无机化学
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光学材料
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晶体学
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传感器技术
✓ 已验证
产品关联
DOI
高影响因子
Journal of Physical Chemistry C
·
2026
·
IF 3.4
Xiaotong Zheng,Xiaoying Wang,Shuilong Chen,Guanglin Yang,Jialong Zhang,Enzi Chen,Hongdie Chen,Chuan Yu,Xi Wan,Ya-qing Bie,Kun Chen
Janus MoSeTe, with intrinsic structural asymmetry and strong spin–orbit coupling, is promising for valleytronics and nonlinear optics. While its properties have been widely predicted theoretically, controlled experimental synthesis has remained elusive. Here, we report the successful synthesis of 2H-phase Janus MoSeTe monolayers, bridging theory and experiment. Raman spectroscopy, X-ray photoelectron spectroscopy, and scanning transmission electron microscopy confirm the Janus structure. The extremely weak photoluminescence indicates an indirect bandgap. We further study its second-harmonic generation (SHG) properties, finding that broken out-of-plane mirror symmetry enhances the second-order nonlinear optical response to ∼1.7× that of monolayer MoSe2. When MoSe2 is stacked on Janus MoSeTe with a ∼30° twist, forming a van der Waals heterostructure, SHG is further enhanced to ∼2.7× monolayer MoSe2 and exhibits anisotropy (maximum-to-minimum intensity ratio ∼1.34). These results provide a route for synthesizing novel 2D Janus TMDs and establish Janus MoSeTe-based systems as a platform for tunable second-order nonlinear optics.
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DOI
高影响因子
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