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Progress in Natural Science:Materials International 2024年第4期34卷 690-701页

作者： Shulin Lü shilong li Zhaoxiang Yan Shusen Wu Jianyu li Xiaoyuan Ji State Key Lab of Materials Processing and Die & Mould Technology School of Materials Science and Engineering Huazhong University of Science and Technology

In this paper, the microstructure evolution and properties of squeeze-cast Al–8Si-1.5Cu–1Ni-0.5Mg-0.5Mn-0.2V-0.2Ti-0.2Zr alloy（hereafter, Al–Si–Cu–Ni alloy for short） were investigated under various solution processes,evaluating the mechanical properties at room and elevated temperatures for both as-cast and T6-treated *** results showed that following the optimal two-stage solution（i.e., solution at 510°C for 6 h + solution at 530°C for 8 h） and subsequent aging at 190°C for 10 h, referred to as the S530-T6 treatment, the Al–Si–Cu–Ni alloy exhibited excellent room/high temperature performance. The ultimate tensile strength（UTS）, yield strength（YS）and elongation of the alloy at room temperature were 410 MPa, 368 MPa and 1.5 %, and the UTS, YS and elongation of alloy at 300°C were 177 MPa, 170 MPa and 6 %, respectively. The increase in strength at room temperature is mainly attributed to the spheroidization of eutectic silicon and the precipitate strengthening aroused from uniformly dispersed nano-sized Q-Al4Cu2Mg8Si7, σ-Al5Cu6Mg2and θ'-Al2Cu phases, while the increase in strength at high temperature is due to the formation of heat-resistant Ni-rich phases and the improvement of the micromorphology of high melting point intermetallic compounds.

关键词： Al-Si-Cu-Ni alloy Heat treatment Microstructure Squeeze casting Ultra-high strength

Interlayer-confined two-dimensional manganese oxide-carbon nanotube catalytic ozonation membrane for efficient water purification

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Frontiers of Chemical Science and Engineering 2022年第5期16卷 731-744页

作者： Dean Xu Tong Ding Yuqing Sun shilong li Wenheng Jing State Key Laboratory of Materials-Oriented Chemical Engineering Nanjing Tech UniversityNanjing 210009China

Catalytic ozonation technology has attracted copious attention in water purification owing to its favorable oxidative degradation of pollutants and mitigation of membrane fouling ***,its extensive industrial application has been restricted by the low ozone utilization and limited mass transfer of the short-lived radical *** space-confined catalysis has been theoretically proven to be a viable strategy for achieving high catalytic ***,a two-dimensional MnO_(2)-incorporated ceramic membrane with tunable interspacing,which was obtained via the intercalation of a carbon nanotube,was designed as a catalytic ozonation membrane reactor for degrading methylene *** from the abundant catalytic active sites on the surface of two-dimensional MnO_(2) as well as the ultralow mass transfer resistance of fluids due to the nanolayer confinement,an excellent mineralization effect,i.e.,1.2 mg O_(3)(aq)mg^(-1) TOC removal(a total organic carbon removal rate of 71.5%),was achieved within a hydraulic retention time of 0.045 s of pollutant ***,the effects of hydraulic retention time and interlayer spacing on methylene blue removal were ***,the mechanism of the catalytic ozonation employing catalytic ozonation membrane was proposed based on the contribution of the Mn(III/IV)redox pair to electron transfer to generate the reactive oxygen *** innovative twodimensional confinement catalytic ozonation membrane could act as a nanoreactor and separator to efficiently oxidize organic pollutants and enhance the control of membrane fouling during water purification.

关键词： catalytic membrane reactor catalytic ozonation nanoconfinement two-dimensional manganese oxide

Chirality-dependent concentration boundaries of single-wall carbon nanotubes for photoluminescence characterization and applications

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Nano Research 2023年第2期16卷 1820-1825页

作者： shilong li linhai li Xiaojun Wei Weiya Zhou Sishen Xie Huaping liu Beijing National Laboratory for Condensed Matter Physics Institute of PhysicsChinese Academy of SciencesBeijing 100190China Department of Physical Science and Center of Materials Science and Optoelectronics EngineeringUniversity of Chinese Academy of SciencesBeijing 100049China Beijing Key Laboratory for Advanced Functional Materials and Structure Research Beijing 100190China Songshan Lake Materials Laboratory Dongguan 523808China

Increasing the concentration of single-wall carbon nanotubes(SWCNTs)is an effective method for enhancing their luminescence ***,an increase in the concentration of SWCNTs would inevitably increase their reabsorption effect,degrading their luminescence ***,we systematically investigated variations in the photoluminescence(PL)intensity of(6,5)single-chirality SWCNTs while increasing their *** results show that the PL intensity first increased to a maximum and then decreased with increasing *** analysis indicates that the concentration boundary corresponding to the maximum PL intensity was strongly dependent on the ratio of the optical absorbances of the SWCNTs at their excitation and emission *** to this,statistical analysis by experimentally measuring the optical absorption spectra of 18 kinds of single-chirality SWCNTs shows that the concentration boundaries of SWCNTs were dependent upon their Types and *** concentration boundary of Type I SWCNTs was higher than that of Type II SWCNTs,and the concentration boundaries of both Types increased with increasing *** results provide important guidance for spectral characterization and applications in bioimaging and photoelectronic devices.

关键词： single-wall carbon nanotube photoluminescence concentration boundary reabsorption

Flower-like tin oxide membranes with robust three-dimensional channels for efficient removal of iron ions from hydrogen peroxide

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Chinese Journal of Chemical Engineering 2024年第1期65卷 1-7页

作者： Risheng Shen shilong li Yuqing Sun Yuan Bai Jian Lu Wenheng Jing State Key Laboratory of Materials-Oriented Chemical Engineering Nanjing Tech UniversityNanjing 210009China National Energy Group Science and Technology Research Institute Co. Ltd.Nanjing 210023China

Membrane technology has become the mainstream process for the production of electronic grade hydrogen peroxide(H_(2)O_(2)).But due to the oxidation degradation of the organic membranes(***)by the strong oxidative radicals(e.g.OH)generated via the activation of H_(2)O_(2)by iron ions(Fe^(3+)),the short effective lifetime of membranes remains a *** nano tin oxide(SnO_(2))has great potential for the removal of Fe^(3+)in strongly oxidative H_(2)O_(2)because of its ability to stabilize H2O_(2)and preferentially adsorb Fe^(3+).Herein,we have designed for the first time a flower-like robust SnO_(2)membrane on the ceramic support by in situ template-free one-step hydrothermal *** three-dimensional loose pore structure in the membrane built by interlacing SnO_(2)nanosheets endows the SnO_(2)membrane with a high specific surface area and abundant adsorption sites(AOH).Based on the coordination complexation and electrostatic attraction between the SnO_(2)surface and Fe^(3+),the membrane shows a high Fe3+removal efficiency(83%)and permeability(24 L·m^(-2)·h^(-1)·MPa^(-1))in H_(2)O_(2).This study provides an innovative and simple approach to designing robust SnO_(2)membranes for highly efficient removal of Fe^(3+)in harsh environments,such as strong oxidation conditions.

关键词： Hydrogen peroxide SnO_(2)membrane Adsorption Hydrothermal

Application of Rare Earth Oxides in Diesel Exhaust Purification Catalysts

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Journal of Rare Earths 2004年第Z1期22卷 194-196页

作者： Zhang Zhaoliang Yu Pengfei Wang shilong li Chunfeng Dai Hua College of Chemistry and Chemical Engineering Jinan University Jinan 250022 China Hainan liuhe Enviromental Protection Catalysts Co. Ltd. Jinpan Industrial Development Zone Haikou 570216 China College of Chemistry and Chemical Engineering Jinan University Jinan 250022 China College of Chemistry and Chemical Engineering Jinan University Jinan 250022 China College of Chemistry and Chemical Engineering Jinan University Jinan 250022 China Hainan Liuhe Enviromental Protection Catalysts Co. Ltd.Jinpan Industrial Development Zone Haikou 570216 China

Diesel oxide catalysts and soot combustion catalysts were reported in this *** former was manufactured in mass last year, and enhanced performance is under development *** later is screened out and further research is under *** best soot combustion catalyst could ignite soot combustion even at 350 ℃, which is within the range of temperatures reached in diesel exhaust, and shows the catalytic combustion velocity nearly one time faster compared with non-catalytic combustion of soot, which is of benefit to rapid regeneration of diesel particulate filter, thus it might be an excellent practicable catalyst.

关键词： diesel oxidation catalyst soot combustion catalyst perovskite rare earths

Diameter-dependent photoelectric performances of semiconducting carbon nanotubes/perovskite heterojunctions

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Nano Research 2023年第11期16卷 12662-12669页

作者： Yayang Yu Wenke Wang Xiao li linhai li shilong li Xiaojun Wei Weiya Zhou Jing lin Yang Huang Huaping liu School of Materials Science and Engineering Hebei Key Laboratory of Boron Nitride Micro and Nano MaterialsHebei University of TechnologyTianjin 300130China Beijing National Laboratory for Condensed Matter Physics Institute of PhysicsChinese Academy of SciencesBeijing 100190China Center of Materials Science and Optoelectronics Engineering School of Physical SciencesUniversity of Chinese Academy of SciencesBeijing 100049China Beijing Key Laboratory for Advanced Functional Materials and Structure Research Beijing 100190China Songshan Lake Materials Laboratory Dongguan 523808China

The heterojunction of single-wall carbon nanotubes(SWCNTs)and perovskite quantum dots(QDs)shows excellent photodetection performances due to the combination of the advantages of high carrier mobility of SWCNTs and high absorption coefficient of perovskite ***,the band structure of a SWCNT is determined by its atomic arrangement *** the structure of SWCNTs affects the photoelectric performance of the composite film remains ***,we systematically explored the diameter effect of SWCNTs with different bandgaps on the photodetection performances of SWCNTs/perovskite QDs heterojunction films by integrating semiconducting SWCNTs(s-SWCNTs)with different diameters with CsPbBr3 *** results show that with an increase in diameter of s-SWCNTs,the heterojunction exhibits increasing responsivity(R),detectivity(D*),and faster response *** great improvement in the optoelectronic performances of devices should be attributed to the higher carrier mobility of larger-diameter SWCNT films and the increasing built-in electric field at the heterojunction interfaces between larger-diameter SWCNTs and CsPbBr3 QDs,which enhances the separation of the photogenerated excitons and the transport of the resulted carriers in SWCNT films.

关键词： carbon nanotubes perovskite quantum dots diameter effect responsivity detectivity

Wall-resolved large-eddy simulation of turbulent channel flows with rough walls

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Theoretical & Applied Mechanics Letters 2021年第1期11卷 32-36页

作者： shilong li Xiaolei Yang Guodong Jin Guowei He The State Key Laboratory of Nonlinear Mechanics Institute of MechanicsChinese Academy of SciencesBeijing 100190China School of Engineering Sciences University of Chinese Academy of SciencesBeijing 100049China

Turbulent flows over rough surfaces widely exist in nature and *** its mechanism is of theoretical and practical *** this work we simulate the turbulent channel flow with rough walls using large-eddy simulation with rough elements resolved using the curvilinear immersed boundary method and compare the results obtained in this work with those in the paper by Yuan and Piomelli(*** Mech.,vol.760,pp.R1,2014),where the volume of fluid method was employed for modeling rough *** mean streamwise velocity profiles predicted by the two methods agree well with each *** in Reynolds stresses and dispersive stresses are observed,which are attributed to the different approaches in dealing with the complex geometry of the rough surface.

关键词： Rough wall turbulence Curvilinear immersed boundary method Wall-resolved large eddy simulation

Constructing fast mass-transfer channels with efficient catalytic ozonation activity in 2D manganese dioxide membranes by intercalating Fe/Mn bimetallic MOF

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Chinese Journal of Chemical Engineering 2024年第10期74卷 272-286页

作者： Dandan Zhou shilong li Luyi Chai Jian Lu Tianxiang Yu Yuqing Sun Wenheng Jing State Key Laboratory of Materials-Oriented Chemical Engineering Nanjing Tech UniversityNanjing 210009China Nanjing Fu Ding New Energy Technology Co.Ltd. Nanjing 210023China

Two-dimensional(2D)catalytic ozonation membranes are promising for the treatment of micropollutants in wastewater due to simultaneous ozone-catalyzed degradation and membrane filtration ***,it remains challenging for 2D catalytic ozonation membranes to efficiently degrade micropollutants due to low mass-transfer efficiency and poor catalytic ***,Fe/Mn bimetallic metal-organic framework(MOF)intercalated lamellar MnO_(2) membranes with fast and robust ozone-catalyzed mass-transfer channels were developed on the surface of the hollow fiber ceramic membrane(HFCM)to obtain 2D Fe/Mn-MOF@MnO_(2)-HFCM for efficiently degrading micropollutants in *** intercalation of Fe/Mn-MOF expanded the interlayer spacing of the MnO_(2) membrane,thereby providing abundant transport channels for rapid passage of *** notably,the Fe/Mn-MOF provided enriched reactive sites as well as high electron transfer efficiency based on the redox cycling between Mn^(3+)/Mn^(4+) and Fe^(2+)/Fe^(3+),ensuring the effective catalytic oxidative degradation of micropollutants including tetracycline hydrochloride(TCH),methylene blue,and methyl ***,the carboxyl groups on the MOF formed covalent bonds(-COO-)with the hydroxyl groups in MnO_(2) between layers,which increased the interaction between MnO_(2) nanosheets to form stable interlayer ***,the optimal composite membrane achieved a high removal rate of TCH micropollutant(93.4%),high water treatment capacity(282 L·m^(-2)·h^(-1)·MPa^(-1)),and excellent longterm stability(1200 min).This study provides a simple and easily scalable strategy to construct fast,efficient,and stable 2D catalytic mass-transfer channels for the efficient treatment of micropollutants in wastewater.

关键词： Catalytic ozonation Two-dimensional ceramic membranes Fe/Mn bimetallic MOF Micropollutants

Quantitative analysis of the intertube coupling effect on the photoluminescence characteristics of distinct(n,m)carbon nanotubes dispersed in solution

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Nano Research 2020年第4期13卷 1149-1155页

作者： shilong li Dehua Yang Jiaming Cui Yanchun Wang Xiaojun Wei Weiya Zhou Hiromichi Kataura Sishen Xie Huaping liu Beijing National Laboratory for Condensed Matter Physics Institute of PhysicsChinese Academy of SciencesBeijing 100190China Center of Materials Science and Optoelectronics Engineering College of Materials Science and Opto-Electronic TechnologyUniversity of Chinese Academy of SciencesBeijing 100049China Department of Physical Science University of Chinese Academy of SciencesBeijing 100049China Beijing Key Laboratory for Advanced Functional Materials and Structure Research Beijing 100190China Songshan Lake Materials Laboratory Dongguan 523808China Nanomaterials Research Institute National Institute of Advanced Industrial Science and Technology(AIST)Tsukuba 305-8565Japan

In this work,we quantitatively studied the intertube coupling of different(n,m)-sorted semiconducting single-wall carbon nanotubes(SWCNTs)on their photoluminescence(PL)efficiencies by precisely tuning the ratio of(9,4)and(6,5)SWCNTs in the mixture.A significant decrease in the PL intensity of(9,4)SWCNTs was observed after mixing with(6,5)species when fixing the(9,4)concentration,which was confirmed to be caused by the absorption of incident photons and reabsorption of the emitted photons by the added(6,5)*** contrast,a similar decrease in the PL intensity of(6,5)SWCNTs was also observed after mixing with the larger-diameter(9,4)*** from that of(9,4)SWCNTs,the PL decrease of(6,5)SWCNTs was found to originate not only from photon absorption and reabsorption by the(9,4)species but also from one-way exciton energy transfer(EET)from the(6,5)SWCNTs to the larger-diameter(9,4)*** the experimental results and numerical simulations further demonstrated that increasing the concentration of mixed(9,4)SWCNTs would enhance the effects of photon absorption and reabsorption and EET on the PL intensity of(6,5)SWCNTs quantified by the decrease ratio of the(6,5)PL ***,the influence of EET was found to be always weaker than that of photon absorption and *** proposed that the observed EET between isolated SWCNTs in a surfactant solution is derived from their proximity due to Brownian motion.

关键词： single-wall carbon nanotubes photoluminescence intertube coupling quantitative analysis

Temperature-induced hydrophobicity transition of MXene membrane for directly preparing W/O emulsions

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Chinese Journal of Chemical Engineering 2023年第3期55卷 59-62页

作者： Yingxiang Ni Can Yuan shilong li Jian Lu Lei Yan Wei Gu Weihong Xing Wenheng Jing State Key Laboratory of Materials-Oriented Chemical Engineering Nanjing Tech UniversityNanjing 210009China

Although hydrophilic membranes are desired for reducing resistance to water permeation, hydrophilic surfaces are not used in the water-in-oil(W/O) membrane emulsification process because water spreads on the hydrophilic surface without forming droplets. Here, we report that a hydrophilic ceramic membrane can form a hydrophobic interface in diesel at a higher temperature;interestingly, the experiments show that the contact angle increases when the temperature rises. The hydrophilic membrane surface evolves into a hydrophobic interface, particularly near the boiling point of water, resulting in a water contact angle of 147.5° ± 1.2°. This work established a method for preparing W/O monodispersed emulsions by direct emulsification of hydrophilic ceramic membranes at a temperature close to the boiling point of ***, it made high flux of membrane emulsification of monodispersed W/O emulsions possible,which satisfied the industrial requirements of fluidized catalytic cracking in the petrochemical industry.

关键词： Membrane emulsification Ceramic membrane Hydrophobic interface W/O emulsions