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Rational design of robust and transparent superrepellent surfaces for long-term marine antifouling

science China(Technological sciences) 2024年第7期67卷 2031-2039页

作者： CHEN Hui WANG Zhi WANG DaHeng XIAO Feng FU Guang-En BU XueLing ZHAO Lei ZHANG Tao WU DaHeng PU JiBin The State Key Laboratory of Refractories and Metallurgy Wuhan University of Science&TechnologyWuhan 430081China Key Laboratory of Advanced Marine Materials Ningbo Institute of Materials Technology and EngineeringChinese Academy of SciencesNingbo 315201China

Superhydrophobic surfaces have demonstrated exceptional efficacy in combatting biofouling contaminations of optical devices and equipment in marine applications. However, the fabrication of highly transparent superhydrophobic materials remains a formidable challenge due to the inherent trade-off between surface roughness for superhydrophobicity and optical ***, we design a robust and transparent superhydrophobic coating(Si-POSS) embedded silica nanoparticles(200 nm) with fluorinated polyhedral oligomeric silsesquioxanes(F-POSS) and zinc pyrithione(ZPT). The Si-POSS coating exhibits excellent water repellence toward diverse liquids and optical transmittance exceeding 90% in the visible spectrum. Moreover, the Si-POSS coating sustains long-term anti-bacterial(> 99.11%) and anti-algal effects for over 30 days, accompanied by mechanical,chemical, and thermal stability. This research asserts that the Si-POSS coating with outstanding combined characteristics holds significant potential for marine applications, particularly in self-cleaning and antifouling endeavors.

关键词： superhydrophobic surface transparent marine antifouling nanoparticles

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Size-controlled synthesis of Fe3O4 and Fe3O4@SiO2 nanoparticles and their superparamagnetic properties tailoring

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Progress in Natural science:materials International 2023年第1期33卷 116-119页

作者： Muhammad Sajid Sidra Shuja Hongpan Rong Jiatao Zhang Beijing Key Laboratory of Construction-Tailorable Advanced Functional Materials and Green Applications School of Materials Science & Engineering Beijing Institute of Technology Beijing Key Laboratory of Construction-Tailorable Advanced Functional Materials and Green Applications Key Laboratory of Medical Molecule Science and Pharmaceutics Engineering School of Chemistry and Chemical Engineering Institute of Engineering Medicine Beijing Institute of Technology

Superparamagnetic properties and fine-tuning of colloidal Fe3O4nanoparticles are important for their widespread biomedical applications. Herein, colloidal Fe3O4nanoparticles（NPs） of different sizes（8–20 nm） were prepared,and their hydrophilization with SiO2shell coating to be Fe3O4@SiO2core-shell had been realized *** size of Fe3O4NPs was controlled by different heating rates. Transmission electron microscope（TEM）, powder X-ray diffractometry（XRD）, and vibrating sample magnetometer（VSM） were performed to examine the morphology, crystallinity, and magnetic properties of the prepared Fe3O4and Fe3O4@SiO2core-shell NPs,respectively. In addition, high resolution transmission electron microscope（HRTEM） results suggested that Fe3O4NPs had well crystallization. Enabled by such, their superparamagnetic properties can be fine-tuned accordingly and cater to their potential applications.

关键词： Fe3O4 nanoparticles Fe3O4@SiO2 hydrophilization Superparamagnetic Core-shell Aqueous inverse microemulsion

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Ultrathin GaN Film Derived from Amorphous Ga_(2)O_(3) Film

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Journal of Wuhan University of Technology(materials science) 2024年第4期39卷 814-818页

作者：王鹏 ZHANG Binbin LIU Xiaofei ZHANG Xin TU Rong ZHANG Song 李宝文 State Key Laboratory of Advanced Technology for Materials Synthesis and Processing Wuhan University of TechnologyWuhan 430070China State Key Laboratory of Silicate Materials for Architectures School of Materials Science and EngineeringWuhan University of TechnologyWuhan 430070China

It remains a big challenge to synthesize two-dimensional(2D)GaN material for applications in power *** synthetic methods require complex equipment and processes and time ***,we reported a two-step route to prepare polycrystalline 2D GaN *** amorphous ultrathin Ga_(2)O_(3)film was first exfoliated from the surface of liquid *** a vapor phase reaction,2D Ga_(2)O_(3)film was then converted into 2D GaN film while maintaining the 2D *** and high-resolution transmission electron microscope(HRTEM)analysis implies the successful synthesis of wurtzite-type GaN ultrathin *** simple strategy proposed in this work will provide more opportunities for applications of GaN ultrathin film in many devices.

关键词： GaN Ga_(2)O_(3) liquid gallium

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Effects of diamond particle size on microstructure and properties of diamond/Al-12Si composites prepared by vacuum-assisted pressure infiltration

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China Foundry 2024年第4期21卷 360-368页

作者： Jia-ping Fu Can-xu Zhou Guo-fa Mi Yuan Liu School of Materials Science and Engineering Henan Polytechnic UniversityJiaozuo 454100HenanChina School of Materials Science and Engineering Tsinghua UniversityBeijing 100084China Key Laboratory for Advanced Materials Processing Technology Ministry of EducationBeijing 100084China

Diamond/aluminium composites have attracted attention in the field of thermal management of electronic packaging for their excellent *** order to solve the interfacial problem between diamond and aluminium,a novel process combining pressure infiltration with vacuum-assisted technology was proposed to prepare diamond/aluminum *** effect of diamond particle size on the microstructure and properties of the diamond/Al-12Si composites was *** results show that the diamond/Al-12Si composites exhibit high relative density and a uniform *** thermal conductivity and coefficient of thermal expansion increase with increasing particle size,while the bending strength exhibits the opposite *** the average diamond particle size increases from 45μm to 425μm,the thermal conductivity of the composites increases from 455 W·m^(-1)·K^(-1)to 713 W·m^(-1)·K^(-1)and the coefficient of thermal expansion increases from 4.97×10^(-6)K^(-1)to 6.72×10^(-6)K^(-1),while the bending strength decreases from 353 MPa to 246 *** research demonstrates that high-quality composites can be prepared by the vacuum-assisted pressure infiltration process and the thermal conductivity of the composites can be effectively improved by increasing the diamond particle size.

关键词： diamond/aluminum composites thermal conductivity electronic packaging vacuum-assisted pressure infiltration

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3D reconstruction of a million atoms by multiple-section local-orbital tomography

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science Bulletin 2025年第1期70卷 64-69页

作者： Liangze Mao Jizhe Cui Rong Yu School of Materials Science and Engineering Tsinghua UniversityBeijing 100084China MOE Key Laboratory of Advanced Materials Tsinghua UniversityBeijing 100084China State Key Laboratory of New Ceramics and Fine Processing Tsinghua UniversityBeijing 100084China

Three-dimensional(3D)structural analysis is an important field in physical and biological *** exist two groups of electron microscopy methods that are capable of providing 3D structural information of an object,i.e.,electron tomography and depth *** tomography is capable of resolving atoms in all three dimensions,but the accuracy in atomic positions is low and the object size that can be reconstructed is *** sectioning methods give high positional accuracy in the imaging plane,but the spatial resolution in the third dimension is *** this work,electron tomography and depth sectioning are combined to form a method called multiple-section local-orbital tomography,or nLOT in *** nLOT method provides high spatial resolution and high positional accuracy in all three *** object size that can be reconstructed is extended to a million *** present method establishes a foundation for the widespread application of atomic electron tomography.

关键词： Atomic electron tomography Depth sectioning Local-orbital Atomic resolution

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Side-chain cyclization enhancing molecular rigidity and π-π stacking yields as-cast binary organic solar cells with 19.1% efficiency

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science China Chemistry 2025年第06期68卷 2500-2512页

作者： Lang Li Wei Gao Ruijie Ma Xinjing Zhao Top Archie Dela Pe?a Jiaying Wu Jian-Xin Tang Zhanhua Wei Xiamen Key Laboratory of Optoelectronic Materials and Advanced Manufacturing Institute of Luminescent Materials and Information Displays College of Materials Science and Engineering Huaqiao University Department of Electrical and Electronic Engineering Research Institute for Smart Energy (RISE) Photonic Research Institute (PRI) The Hong Kong Polytechnic University Advanced Materials Thrust Function Hub The Hong Kong University of Science and Technology Nansha Macao Institute of Materials Science and Engineering (MIMSE) Faculty of Innovation Engineering Macau University of Science and Technology

High-performance as-cast organic solar cells(OSCs) are rarely reported due to the challenges in achieving high-quality active layer morphology via a single-step process. Herein, four small molecule acceptors(SMAs) substituted with cyclic alkyl chains of varying carbon numbers were synthesized and utilized to fabricate highly efficient as-cast OSCs. The side-chain cyclization strategy significantly enhances molecular rigidity and strengthens intermolecular packing, particularly in Se-Cb, which exhibits an excellent three-dimensional(3D) stacking framework with a π-π stacking distance as short as 3.34 ?. As the size of cyclic alkyl chain increases, the packing mode of SMA single crystals shift from 3D to 2D, accompanied by a greater π-π stacking distance due to increased steric hindrance. As-cast binary devices based on D18/Se-Cb achieved a record power conversion efficiency(PCE) of 19.1% with a fill factor(FF) exceeding 80%, and a certified value of 18.45%. Se-Cb forms a more uniform vertical phase separation morphology than the control SMA within the D18 matrix, enhancing carrier transport and significantly suppressing sub-nanosecond bimolecular recombination. This study systematically investigates the effects of cyclic alkyl chain substitution on the properties and photovoltaic performance of SMAs, identifying cyclobutyl as a promising candidate for efficient as-cast OSCs with high FF.

关键词： organic solar cells small molecule acceptor cyclic alkyl chain as-cast selenophene

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Ultrafast Laser Irradiation Induced Oxidation of Dopant-Free Spiro-OMeTAD for Improving the Perovskite Solar Cells Performance

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Energy & Environmental materials 2025年第2期8卷 284-290页

作者： Jiaqi Meng Xiangyu Chen Weihan Li Nianyao Chai Zhongle Zeng Yunfan Yue Fengyi Zhao Xuewen Wang Center of Femtosecond Laser Manufacturing for Advanced Materials and Devices State Key Laboratory of Advanced Technology for Materials Synthesis and ProcessingWuhan University of TechnologyWuhan 430070China School of Materials Science and Engineering Wuhan University of TechnologyWuhan 430070China International School of Materials Science and Engineering Wuhan University of TechnologyWuhan 430070China National Energy Key Laboratory for New Hydrogen-Ammonia Energy Technologies Foshan Xianhu LaboratoryFoshan 528000China

The exceptional photoelectric performance and high compatibility of perovskite materials render perovskite solar cells highly promising for extensive development,thus garnering significant *** perovskite solar cells,the hole transport layer plays a crucial *** the commonly employed organic small molecule hole transport material Spiro-OMeTAD,a certain period of oxidation treatment is required to achieve complete transport ***,this posttreatment oxidation processes typically rely on ambient oxidation,which poses challenges in terms of precise control and leads to degradation of the perovskite light absorption *** approach fails to meet the demands for high efficiency and stability in practical ***,the mechanism of ultrafast laser on Spiro-OMeTAD and the reaction process for laser-induced oxidation of it are ***_(2) at Perovskite/Spiro-OMeTAD interface breaks down to produce I_(2) upon ultrafast laser irradiation and I_(2) promote the oxidation *** the laser irradiation oxidation processing,a higher stability of perovskite solar cells is *** work establishes a new approach toward oxidation treatment of Spiro-OMeTAD.

关键词： hole transport layer perovskite solar cells ultrafast laser irradiation undoped Spiro-OMeTAD

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Segregation of Mg-6Gd alloy under natural convection:From macro solute distribution to micro dendrite growth

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China Foundry 2024年第5期21卷 613-624页

作者： Hong-xu Chen Ang Zhang Hao Li Yu Gao Yu-hong Cui Guang-sheng Huang Bin Jiang Fu-sheng Pan National Engineering Research Center for Magnesium Alloys National Key Laboratory of Advanced Casting TechnologiesCollege of Materials Science and EngineeringChongqing UniversityChongqing 400044China

Segregation is a serious defect in alloy ingots which severely deteriorates materials *** segregation defect in Mg-6Gd alloy is studied by coupling macro thermal-solutal-convection transport and micro dendrite *** macroscopic fluid dynamics and mass transfer equations are resolved to forecast the segregation behavior under conditions of continuous temperature variation during the solidification *** numerical model is validated by testing double-diffusive natural convection in a closed square cavity.A phase field model is then applied to simulate the micro dendrite growth,using macro undercooling and liquid flow velocity as boundary *** show that the multiscale segregation behavior,including macro solute distribution and micro dendritic morphology,is strongly dependent on the temperature condition and the liquid convection,which provides guidance for reducing and eliminating the segregation defect.

关键词： magnesium alloy segregation numerical simulation phase-field simulation multiscale

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Effect of T6 Treatment on the Microstructure and Properties of Mg-Zn-Ce with Different Zn Contents 75

Effect of T6 Treatment on the Microstructure and Properties ...

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75th World Foundry Congress, WFC 2024

作者： Jiang, Aoxue You, Zhiyong Jin, Shuaishuai Sun, Chunle Wang, Kaiying Institute of Energy Innovation Key Laboratory of Interface Science and Engineering in Advanced Materials Ministry of Education College of Materials Science and Engineering Taiyuan University of Technology 030024 China

The alloy compositions and heat treatment processes of Mg-Zn-Ce were designed and formulated based on phase diagram calculations. Mg-5Zn-0.2Ce and Mg-7Zn-0.3Ce alloys with different Zn contents were prepared through rapid solidification and T6 treatment. The study showed that when the Zn content is less than its maximum solubility in Mg (6.2 wt.%), T6 heat treatment results in a coarse microstructure and the occurrence of secondary recrystallization. When the Zn content is greater than 6.2 wt.%, T6 heat treatment refines the grains and significantly improves the mechanical properties. However, T6 treatments will generally produce a large number of MgZn and Mg12Ce precipitates distributed within the MgZn-Ce alloy microstructure. These precipitates greatly enhance the comprehensive mechanical properties of the alloy. © 2024 75th World Foundry Congress, WFC 2024. All rights reserved.

关键词： Rapid solidification

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Molecular simulation and experimental investigation of thermal conductivity of flexible graphite film

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Journal of Materiomics 2024年第6期10卷 1261-1269页

作者： Shiyu Hou Yang Liu Qingtao Yu Jikun Chen Ruitao Lv Wanci Shen Feiyu Kang Zheng-Hong Huang Key Laboratory of Advanced Materials of Ministry of Education School of Materials Science and EngineeringTsinghua UniversityBeijing100084China School of Materials Science and Engineering University of Science and Technology BeijingBeijing100083China School of Materials Science and Engineering Beihang UniversityBeijing100191China

Flexible graphite film(FGF),as a traditional interface heat dissipation material,has high *** is a challenge to enhance both in-plane and through-plane thermal conductivity of *** this reason,the effects of oxygen content,layer spacing,density and particle size on the in-plane and through-plane thermal conductivity of FGF were studied by both molecular simulation and experimental *** simulation results indicate that the ways to improve the thermal conductivity of FGF include reducing oxygen content and layer spacing,increasing the density and matching the size of graphite *** FGF prepared from room temperature exfoliated graphite(RTFGF)has a wide range of adjustable density(1.3–2.0 g/cm^(3))and thickness(50–400μm).The thermal conductivity of the RTFGF is significantly improved after heat treatment owing to reduced oxygen content and layer spacing,which is consistent with the simulation ***,RTFGF with both high in-plane(518 W·m^(-1)·K^(-1))and through-plane(7.2 W·m^(-1)·K^(-1))thermal conductivity can be obtained by particle size matching of graphite.

关键词： Room temperature exfoliated graphite Flexible graphite film Thermal conductivity Molecular simulation Anisotropy

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