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Low-cost chemical surface smoothing of CO2 laser-etched acrylic using WELD ON 4 acrylic solvent cement

International Journal of Advanced Manufacturing Technology 2025年第5期138卷 2245-2255页

作者： Moncada, Luis H. Safaripour, Samira Hutter, Tanya Walker Department of Mechanical Engineering The University of Texas at Austin AustinTX78712 United States Materials Science and Engineering Program and Texas Materials Institute The University of Texas at Austin AustinTX78712 United States

With the increasing use of micro-manufactured devices and the demand for low-cost fabrication techniques, this study presents a simple and scalable surface polishing method for laser etched acrylic using WELD-ON 4 acrylic solvent cement, a solvent typically used for bonding thermoplastics. The method’s effectiveness was evaluated by treating acrylic samples up to three times and analyzing changes in transparency, surface roughness average (Ra), luminescence, and wettability. Results show that even a single treatment significantly improved surface smoothness, reduced light scattering, and brought contact angle and optical clarity closer to those of unetched acrylic. After three treatments, the surface became isotropic, with laser-etched lines disappearing. Specifically, a 60% reduction in Ra was observed in the direction perpendicular to the etched lines, while the parallel direction initially showed a similar trend, followed by a slight increase attributed to the formation of surface irregularities caused by the re-solidification of dissolved acrylic. Contact angle measurements indicated that the surface remained hydrophilic, with controllable wettability based on the number of treatments. Overall, this method provides a low-cost, cleanroom-free solution for improving the surface finish of laser-fabricated acrylic components. Its compatibility with complex or recessed geometries makes it particularly suitable for microfluidic devices and other precision applications requiring both optical clarity and controlled surface properties. © The Author(s), under exclusive licence to Springer-Verlag London Ltd., part of Springer Nature 2025.

关键词： Carbon dioxide lasers

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Boosting bulk photovoltaic effect in transition metal dichalcogenide by edge semimetal contact

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Light(science & Applications) 2025年第1期14卷 197-205页

作者： Shuang Qiao Jihong Liu Chengdong Yao Ni Yang Fangyuan Zheng Wanqing Meng Yi Wan Philip C.Y.Chow Dong-Keun Ki Lijie Zhang Yumeng Shi Lain-Jong Li Hebei Key Laboratory of Optic-Electronic Information and Materials College of Physics Science and TechnologyHebei University071002BaodingChina Department of Mechanical Engineering The University of Hong KongHong KongChina Department of Physics and HK Institute of Quantum Science&Technology The University of Hong KongHong KongChina Key Laboratory of Carbon Materials of Zhejiang Province College of Chemistry and Materials EngineeringWenzhou UniversityWenzhouChina Key Laboratory of Luminescence and Optical Information Ministry of EducationSchool of Physical Science and EngineeringBeijing Jiaotong University100044BeijingChina

Oxide materials with a non-centrosymmetric structure exhibit bulk photovoltaic effect(BPVE)but with a low cell *** the past few years,relatively larger BPVE coefficients have been reported for two-dimensional(2D)layers and stacks with asymmety-induced spontaneous ***,we report a crucial breakthrough in boosting the BPVE in 3R-MoS2 by adopting edge contact(EC)geometry using bismuth semimetal *** clear contrast to the typically used top contact(TC)geometry,the EC metal which strongly adheres to the edges and the subtrates can induce a pronounced tensile strain to the 3R-MoS2,and the lateral contact geometry allows to completely access to in-plane polarization from underneath layers reachable by light,leading to>100 times of BPVE enhancement in *** further design a 3R-MoS2/WSe2 heterojunction to demonstrate constructive coupling of BPVE with the conventional photovoltaic effect,indicating their potential in photodetectors and photovoltaic devices.

关键词： effect geometry breakthrough

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Synthesis of monolayer tungsten nitride:Rapid optical visualization and electrical impact of grain boundaries

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Nano Research 2025年第3期18卷 645-653页

作者： Qiuyun Yang Dehu Li Fanfan Shi Zhibin Shao Na Wang Yao Peng Edwin Hang Tong Teo Zheng Liu Hong Wang Department of Physics University of Science and Technology of ChinaHefei 230026China Institute of Electrical and Electronic Engineering Anhui Science and Technology UniversityFengyang 233100China College of Mechanics and Engineering Science Hohai UniversityNanjing 211100China School of Materials Science and Engineering Nanyang Technological University50 Nanyang AvenueSingapore 639798Singapore

Two-dimensional(2D)transition metal nitrides(TMNs)have garnered significant attention in fields such as energy storage and nanoelectronics due to their unique electrical properties,high chemical stability,and excellent mechanical *** polycrystalline 2D TMNs films,grain boundaries(GBs)are inevitable structural defects that could play a crucial role in determining the material's *** rapid optical visualization methods is essential for obtaining large-scale information on the distribution of ***,the rapid visualization of GBs in 2D TMNs,as well as the impact of GBs on the material's electrical properties,has never been previously *** this study,we demonstrate the growth of monolayer tungsten nitride crystals on SiO_(2)/Si substrates by chemical vapor deposition(CVD).High-resolution transmission electron microscopy reveals the presence of GBs at the junctions of twisted grains.A wet-etch process utilizing buffered oxide etchant(BOE)enables rapid and effective visualization of these GBs with optical *** analyzing grains with different twist angles,we find that GBs at specific angles demonstrate increased stability during *** measurements revealed that tilted GBs hinder electrical transport,with GBs of a 62°twist angle showing sheet conductance nearly half that within the monolayer *** work not only provides insights into GBs in monolayer tungsten nitride but also lays the groundwork for exploring GBs-related properties in other 2D TMNs.

关键词： two-dimensional(2D)materials grain boundary chemical vapor deposition electrical property tungsten nitride

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Advancing optothermal manipulation:decoupling temperature and flow fields in quasi-isothermal microscale streaming

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Light(science & Applications) 2023年第9期12卷 1713-1714页

作者： Youngsun Kim Yuebing Zheng Materials Science and Engineering Program and Texas Materials Institute The University of Texas at AustinAustinTX78712USA Walker Department of Mechanical Engineering The University of Texas at AustinAustinTX78712USA

By decoupling temperature and flow fields through symmetry-correlated laser scan sequences,ISO-FLUCS enables quasi-isothermal optofluidic microscale *** technique offers precise control over fluid manipulation while m... 详细信息

关键词： thermal isothermal flow

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Mesoporous N-incorporated carbon with Ti single atom-regulated electronic structure as high performance cathodes for Li-S batteries

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Nano Research 2025年第2期18卷 337-345页

作者： Jiafeng Hu Yunfei Xiao Zhengguang Hu Guanghao He Zhongheng Zhu Fengping Xie Li Wang Li Zuo Yong Zhao Department of Physics School of Physics and Materials ScienceNanchang UniversityNanchang 330031China National Engineering Research Center for Bioengineering Drugs and the Technologies Institute of Translational MedicineJiangxi Medical CollegeNanchang UniversityNanchang 330031China

Lithium-sulfur(Li-S)batteries are considered as strong competitors for next-generation energy storage because of their high theoretical energy ***,some challenges,such as shuttle effect of lithium polysulfides(LiPSs),volume expansion of sulfur during charge/discharge process and poor conductivity of the cathode,hindered their commercial *** this paper,an excellent sulfur host material,the titanium single atom(TiSA)-anchored mesoporous N-incorporated carbon(TiSA-NC)was successfully *** introduction of TiSAs onto the NC textures optimized their electronic structures including the charge distribution between the constituent atoms and the total density of states(TDOS)near the Fermi ***,the button battery constructed by TiSA-NC delivered impressive energy storage performance:a high reversible capacity of 1077 mAh·g^(-1) at 0.1 C;an outstanding rate capacity of 541 mAh·g^(-1) at 3 C;a superior long-term stability with a capacity fading rate of 0.053%per cycle for 500 cycles at 0.5 *** work provided an effective strategy for manufacturing high performance Li-s batteries by designing and constructing single atom catalysts.

关键词： lithium-sulfur(Li-S)battery single atoms electronic structure catalyst kinetics

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Progress on the antiferromagnetic topological insulator MnBi2Te4

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National science Review 2024年第2期11卷 33-49页

作者： Shuai Li Tianyu Liu Chang Liu Yayu Wang Hai-Zhou Lu X.C.Xie Department of Physics Harbin Institute of Technology Shenzhen Institute for Quantum Science and Engineering and Department of Physics Southern University of Science and Technology(SUSTech) Quantum Science Center of Guangdong-Hong Kong-Macao Greater Bay Area(Guangdong) Shenzhen Key Laboratory of Quantum Science and Engineering International Quantum Academy Beijing Academy of Quantum Information Sciences Beijing Key Laboratory of Optoelectronic Functional Materials&Micro-Nano Devices Department of Physics Renmin University of China State Key Laboratory of Low Dimensional Quantum Physics Department of PhysicsTsinghua University Frontier Science Center for Quantum Information Hefei National Laboratory International Center for Quantum Materials School of Physics Peking University Institute for Nanoelectronic Devices and Quantum Computing Fudan University

Topological materials, which feature robust surface and/or edge states, have now been a research focus in condensed maTher physics. They represent a new class of materials exhibiting nontrivial topological phases,and provide a platform for exploring exotic transport phenomena, such as the quantum anomalous Hall effect and the quantum spin Hall effect. Recently, magnetic topological materials have attracted considerable interests due to the possibility to study the interplay between topological and magnetic *** particular, the quantum anomalous Hall and axion insulator phases can be realized in topological insulators with magnetic order. MnBi2Te4, as the first intrinsic antiferromagnetic topological insulator discovered, allows the examination of existing theoretical predictions; it has been extensively studied, and many new discoveries have been made. Here we review the progress made on MnBi2Te4from both experimental and theoretical aspects. The bulk crystal and magnetic structures are surveyed first, followed by a review of theoretical calculations and experimental probes on the band structure and surface states, and a discussion of various exotic phases that can be realized in MnBi2Te4. The properties of MnBi2Te4thin films and the corresponding transport studies are then reviewed, with an emphasis on the edge state transport. Possible future research directions in this field are also discussed.

关键词： MnBi2Te4 magnetic topological insulator antiferromagnetic quantum anomalous Hall effect axion insulator

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Predicting superconducting temperatures with new hierarchical neural network AI model

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Frontiers of physics 2025年第1期20卷 165-172页

作者： Shaomeng Xu Pu Chen Mingyang Qin Kui Jin X.-D.Xiang School of Materials Science and Engineering Harbin Institute of TechnologyHarbin 150001China Department of Materials Science and Engineering Southern University of Science and TechnologyShenzhen 518055China Beijing National Laboratory for Condensed Matter Physics Institute of PhysicsChinese Academy of SciencesBeijing 100190China

Superconducting critical temperature is the most attractive material property due to its impact on the applications of electricity transmission,railway transportation,strong magnetic fields for nuclear fusion and medical imaging,quantum computing,*** ability to predict its value is a constant pursuit for condensed matter *** developed a new hierarchical neural network(HNN)AI algorithm to resolve the contradiction between the large number of descriptors and the small number of datasets always faced by neural network AI approaches to materials *** this new HNN-based AI model,a much-increased number of 909 universal descriptors for inorganic compounds,and a dramatically cleaned database for conventional superconductors,we achieved high prediction accuracy with a test R^(2)score of 95.6%.The newly developed HNN model accurately predicted T_(c)of 45 new high-entropy alloy superconductors with a mean absolute percent error below 6%compared to the experimental *** demonstrated a significant potential for predicting other properties of inorganic materials.

关键词： conventional superconducting critical temperature hierarchical neural network universal descriptors artificial intelligence

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Strain engineering and hydrogen effect for two-dimensional ferroelectricity in monolayer group-Ⅳmonochalcogenides MX(M=Sn,Ge;X=Se,Te,S)

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Chinese physics B 2023年第3期32卷 396-401页

作者： Maurice Franck Kenmogne Ndjoko 郭必诞彭银辉赵宇军 Department of Materials Science and Engineering South China University of TechnologyGuangzhou 510640China Department of Physics South China University of TechnologyGuangzhou 510640China

Two-dimensional(2D)ferroelectric compounds are a special class of materials that meet the need for devices miniaturization,which can lead to a wide range of ***,we investigate ferroelectric properties of monolayer group-IV monochalcogenides MX(M=Sn,Ge;X=Se,Te,S)via strain engineering,and their effects with contaminated hydrogen are also ***,GeTe,and GeS do not go through transition up to the compressive strain of-5%,and consequently have good ferroelectric parameters for device applications that can be further improved by applying *** to the calculated ferroelectric properties and the band gaps of these materials,we find that their band gap can be adjusted by strain for excellent photovoltaic *** addition,we have determined the most stable hydrogen occupancy location in the monolayer SnS and *** reveals that H prefers to absorb on SnS and SnTe monolayers as molecules rather than atomic *** a result,hydrogen molecules have little effect on the polarization and electronic structure of monolayer SnTe and SnS.

关键词： two-dimensional material strain engineering ferroelectric photovoltaic materials hydrogen effect

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Enhanced charge extraction for all-inorganic perovskite solar cells by graphene oxide quantum dots modified TiO_(2)layer

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Frontiers of Chemical science and engineering 2023年第5期17卷 516-524页

作者： Yili Liu Guoliang Che Weizhong Cui Beili Pang Qiong Sun Liyan Yu Lifeng Dong College of Materials Science and Engineering Qingdao University of Science and TechnologyQingdao 266042China Department of Physics Hamline UniversitySt.PaulMN 55104USA

All-inorganic cesium lead bromide(CsPbBr_(3))perovskite solar cells have been attracting growing interest due to superior performance stability and low ***,low light absorbance and large charge recombination at TiO_(2)/CsPbBr_(3)interface or within CsPbBr_(3)film still prevent further performance ***,we report devices with high power conversion efficiency(9.16%)by introducing graphene oxide quantum dots(GOQDs)between TiO_(2)and perovskite *** recombination of interfacial radiation can be effectively restrained due to enhanced charge transfer *** with C-rich active sites can involve in crystallization and fill within the CsPbBr_(3)perovskite film as functional semiconductor *** work provides a promising strategy to optimize the crystallization process and boost charge extraction at the surface/interface optoelectronic properties of perovskites for high efficient and low-cost solar cells.

关键词： all inorganic perovskite solar cells graphene oxide quantum dots high performance stability

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Progress on two-dimensional ferrovalley materials

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Chinese physics B 2024年第1期33卷 32-43页

作者：李平刘邦陈帅张蔚曦郭志新 State Key Laboratory for Mechanical Behavior of Materials Center for Spintronics and Quantum SystemSchool of Materials Science and EngineeringXi'an Jiaotong UniversityXi'an 710049China State Key Laboratory for Surface Physics and Department of Physics Fudan UniversityShanghai 200433China Jinan Aviation Repair Factory Jinan 250000China Department of Physics and Electronic Engineering Tongren UniversityTongren 554300China

The electron's charge and spin degrees of freedom are at the core of modern electronic devices. With the in-depth investigation of two-dimensional materials, another degree of freedom, valley, has also attracted tremendous research interest. The intrinsic spontaneous valley polarization in two-dimensional magnetic systems, ferrovalley material, provides convenience for detecting and modulating the valley. In this review, we first introduce the development of ***, the valley polarization forms by the p-, d-, and f-orbit that are discussed. Following, we discuss the investigation progress of modulating the valley polarization of two-dimensional ferrovalley materials by multiple physical fields, such as electric, stacking mode, strain, and interface. Finally, we look forward to the future developments of valleytronics.

关键词： ferrovalley valley polarization two-dimensional materials multi-field tunable

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