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Novel Dopamine-Derived Carbon Modified Fe-Based Metal-Organic Framework Enhanced Aptasensor Rendering Ultrasensitive Electrochemical Detection of Oxytetracycline

SSRN

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SSRN 2024年

作者： Song, Jialing Fan, Xiaoxuan Ee, Liang Ying Lin, Xuanhao Li, Sam Fong Yau Huang, Manhong Singapore Donghua University China Shanghai University College of Science Department of Chemistry International Joint Laboratory Catalyst Chemistry Shanghai200444 China College of Environmental Science and Engineering State Environmental Protection Engineering Center for Pollution Treatment and Control in Textile Industry Donghua University Shanghai201620 China National University of Singapore Department of Chemistry 3 Science Drive 3 Singapore117543 Singapore Advanced Membranes and Porous Materials Center Physical Science and Engineering Division King Abdullah University of Science and Technology Thuwal23955-6900 Saudi Arabia Chemical Engineering Program Physical Science and Engineering Division King Abdullah University of Science and Technology Thuwal23955-6900 Saudi Arabia National University of Singapore Environmental Research Institute T Lab Building 5A Engineering Drive 1 Singapore117411 Singapore

In the present work, an aptasensor with dual binding sites based on Au NPs modified with self-polymerized polydopamine (PDA) and Fe-MOF is successfully constructed. In terms of standard electron transfer, the cyclic voltammetry (CV) analysis showcases a rate constant (ks) of 96.0 s-1, signifying an exceptional electron transfer rate of oxytetracycline at the sensor interface of Apt/Au@PDA@NH2-MIL-101(Fe)/GCE. Further deepening the investigation into electrochemical kinetics using chronoamperometry (CA), we investigated the electrocatalytic parameters (Kcat) of Au@PDA@NH2-MIL-101(Fe) in relation to oxytetracycline. The results divulged an impressive average Kcat value of 3.06×105 M-1 S-1. This evidence robustly suggests the superior electrocatalytic activity of Au@PDA@NH2-MIL-101(Fe) when it comes to oxytetracycline oxidation. A custom-designed portable rapid detection platform was developed, achieving detection limits of 6.88 nM under static water flow conditions and 5.56 nM under dynamic conditions. Remarkably, the self-polymerization of PDA on Au NPs not only refines their size but also boosts their interaction with biomolecules, thereby promising excellent biocompatibility. Moreover, the abundance of -COOH groups and unsaturated Fe3+ sites on the NH2-MIL-101(Fe) surface furnishes a considerable number of grafting sites for the aptamer. More importantly, the redox interplay between Au@PDA and NH2-MIL-101(Fe) accelerates electron movement, thus amplifying the electrochemical signal and the detection sensitivity for oxytetracycline. © 2024, The Authors. All rights reserved.

关键词： Rate constants

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A Systematic Study on Wear Behavior of Ticrnbtawx Refractory High-Entropy: Inducing Amorphization to Achieve Anti-Wear

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SSRN 2024年

作者： You, Xin Li, Tao Song, Junjie Du, Yin Wang, Haifeng Lin, Pengyu Zhou, Wei Zhang, Yongsheng Hu, Litian State Key Laboratory of Solidification Processing Center of Advanced Lubrication and Seal Materials Northwestern Polytechnical University Xi’an710072 China State Key Laboratory of Solid Lubrication Lanzhou Institute of Chemical Physics Chinese Academy of Sciences Lanzhou730000 China School of Mechanical and Aerospace Engineering Nanyang Technological University 50 Nanyang Avenue 639798 Singapore Shandong Laboratory of Advanced Materials and Green Manufacturing at Yantai Yantai264006 China School of Materials Science and Engineering China

Refractory high-entropy alloys (RHEAs) possess exceptional properties at elevated temperatures. However, their limited wear resistance at room temperature (RT) hinders their widespread application. In this work, based on compositional modulation and surface engineering strategies, two TiCrNbTaWx (x = 0, 0.5) RHEAs were prepared using spark plasma sintering. The results show that the addition of W can effectively improve the hardness (10.3 GPa) and deformation resistance of the BCC matrix, alleviating the severe adhesion and the fracture behavior. In addition, the friction-induced oxidized amorphous layer with high hardness (12.3 GPa) can further improve the anti-wear properties. Because of these, the TiCrNbTaW0.5 alloy has a low wear rate of 9×10-5 mm-3·N-1·m-1, which is 67% lower than the pristine TiCrNbTa alloy. © 2024, The Authors. All rights reserved.

关键词： High-entropy alloys

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Successive electric polarization transitions induced by high magnetic field in the single-crystal antiferromagnet Co2Mo3O8

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Physical Review B 2022年第6期105卷 064108-064108页

作者： Y. S. Tang G. Z. Zhou L. Lin R. Chen J. F. Wang C. L. Lu L. Huang J. H. Zhang Z. B. Yan X. M. Lu X. K. Huang X. P. Jiang J.-M. Liu Laboratory of Solid State Microstructures and Innovation Center of Advanced Microstructures Nanjing University Nanjing 210093 China Department of Applied Physics College of Science Nanjing Forestry University Nanjing 210037 China Wuhan National High Magnetic Field Center and School of Physics Huazhong University of Science and Technology Wuhan 430074 China School of Materials Science and Engineering Jingdezhen Ceramic Institute Jingdezhen 333403 China

The polar antiferromagnet Co2Mo3O8 was recently reported as a new multiferroic material exhibiting remarkable second-order magnetoelectric (ME) coupling effect while no other metamagnetic transitions occurred at low magnetic field. Herein, we have investigated the ME phenomena under high magnetic field (up to 60 T) in Co2Mo3O8 single crystals and observed unique ME response associated with the changes in the hidden magnetic moment on the honeycomb lattice. Two spin-flop transitions are unambiguously defined at Hc1∼27T and Hc2∼31T under H along the c axis at 1.7 K, accompanied by two successive colossal changes of electric polarization. The results on the anisotropy of magnetoelectricity as well as the angular-dependent polarization are well consistent with the ME tensor prediction, providing a better approach to understand the evolution of magnetic structures under high magnetic field. Therefore, the hidden magnetic transitions and distinctive magnetoelectricity provide a unique platform on which the ME coupling mechanism in the presence of rich magnetic phase transitions can be explored in this 238 family.

关键词： Magnetoelectric effect Antiferromagnets Multiferroics Single crystal materials Magnetization measurements Susceptibility measurements

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Effect of hot rolling on microstructure and tribology behaviors of Ti-50.8Ni alloy

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Transactions of Nonferrous Metals Society of China 2021年第4期31卷 967-979页

作者： Rui YANG Wei MA Chao WANG Ting-mei WANG Qi-hua WANG State Key Laboratory of Solid Lubrication Lanzhou Institute of Chemical PhysicsChinese Academy of SciencesLanzhou 730000China Center of Materials Science and Optoelectronics Engineering University of Chinese Academy of SciencesBeijing 100049China

We link different microstructures to tribological behaviors of Ti-50.8 Ni(mole fraction, %) in reciprocating mode at room temperature(20 ℃). Hot-rolled alloys with B2 phase exhibit lower coefficient of friction and wear rate compared to the ones with B19?. Stress-induced martensitic transformation occurs during sliding. However, multi-pass hot rolling weakens the wear resistance. In this study, microstructures were characterized through electron backscatter diffraction and transmission electron microscopy(EBSD/TEM). From the concept of energy conservation, the effects of weak intensity of hot-rolled textures on the wear resistance are minimal. Based on the result that the alloy with a higher portion of coincidence site lattice boundaries shows lower martensitic start transformation temperature in the DSC curves than that with higher KAM values, the delay on B2-B19? transformation from {112}B2 twins outweighs dislocations. Moreover, widely distributed small-angle grain boundaries owing to dynamic recovery improve the wear resistance effectively compared to those that are well-recrystallized.

关键词： Ti-50.8Ni alloy tribological performance small angle grain boundaries coincidence site lattice(CSL)boundary

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Zwitterionic Polymer Brush-Functionalized Dual-Crosslinked Hydrogel Via Subsurface-Initiated Atom Transfer Radical Polymerization for Anti-Fouling Applications

SSRN

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SSRN 2023年

作者： Wang, Biwen Wang, Peng He, Baoluo Ma, Shuanhong Liu, Shujuan Ye, Qian Zhou, Feng Northwestern Polytechnical University China State Key Laboratory of Solidification Processing Center of Advanced Lubrication and Seal Materials School of Materials Science and Engineering Northwestern Polytechnical University Xi'An710072 China State Key Laboratory of Solid Lubrication Lanzhou Institute of Chemical Physics Chinese Academy of Sciences Lanzhou730000 China

In this work, a double-network (DN) hydrogel embedded with initiator (HHy-Br) was prepared and then reinforced with Fe3+, after which the antifouling polymer (poly-sulfobetaine vinyl imidazole, PSBVI) was successfully grafted onto the HHy-Br substrate via subsurface-initiated atom transfer radical polymerization (sSI-ATRP) to obtain PSBVI-functionalized HHy-Br (HHy-PSBVI). It has been demonstrated that Fe3+ can increase the crosslinking density of HHy-Br;as a result, the tensile strength of the as-prepared hydrogel was increased from 0.07 to 1.75 MPa, as well as its anti-swelling properties were improved (from 648% to 219%). In addition, the presence of Fe3+ can efficiently promote the sSI-ATRP process. Compared with HHy-Br, the PSBVI-functionalized HHy-Br manifested a significant decrease in friction coefficient, as the grafted high-thickness PSBVI brush (about 200 µm) has excellent hydrophilicity and can form a strong hydration layer for lubrication. Furthermore, the as-prepared HHy-PSBVI also exhibits outstanding antibacterial properties against E. coli (nearly 100% were removed) and S. aureus (99% were removed), as well as a satisfactory antifouling effect against microalgae (93% Dunaliella and 92% Chlorella were removed), which is attributed to the synergistic effect between the strong hydration of the zwitterionic polymer and the good bactericidal effect of the cationic imidazole group. © 2023, The Authors. All rights reserved.

关键词： Atom transfer radical polymerization

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Magnetically disordered ground state in the triangular-lattice antiferromagnets Rb3Yb(VO4)2 and Cs3Yb(VO4)2

arXiv

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arXiv 2025年

作者： Ma, Zhen Chen, Yingqi Fu, Zhongtuo Li, Shuaiwei Tong, Xin-An Du, Hong Embs, Jan Peter Zheng, Shuhan Zhang, Yongjun Liu, Meifeng Zhong, Ruidan Liu, Jun-Ming Wen, Jinsheng Hubei Key Laboratory of Photoelectric Materials and Devices School of Materials Science and Engineering Hubei Normal University Huangshi435002 China Tsung-Dao Lee Institute School of Physics and Astronomy Shanghai Jiao Tong University Shanghai200240 China PSI Center for Neutron and Muon Sciences PSI Villigen5232 Switzerland National Laboratory of Solid State Microstructures Department of Physics Nanjing University Nanjing210093 China Collaborative Innovation Center of Advanced Microstructures Jiangsu Physical Science Research Center Nanjing University Nanjing210093 China

Quantum spin liquids (QSLs) represent a unique quantum disordered state of matter that hosts long-range quantum entanglement and fractional excitations. However, structural disorder resulting from site mixing between different types of ions usually arises in real QSL candidates, which is considered as an obstacle to gain the insight into the intrinsic physics. Here, we have synthesized two new rare-earth compounds Rb3Yb(VO4)2 and Cs3Yb(VO4)2. X-ray diffractions reveal a perfect triangular-lattice structure with no detectable disorder. Magnetic susceptibility measurements do not capture any phase transition or spin freezing down to 1.8 K. A fit to low-temperature data indicates dominant antiferromagnetic interactions with the Curie-Weiss temperature of -1.40 K and -0.43 K for Rb3Yb(VO4)2 and Cs3Yb(VO4)2, respectively. Specific heat results show no sign of long-range magnetic order down to ∼0.1 K either, but only a Schottky anomaly that is continuously mediated by the external magnetic fields. Additionally, inelastic neutron scattering is employed to detect low-energy spin excitations in Rb3Yb(VO4)2. The absence of magnetic excitation signals as well as static magnetic order down to 97 mK aligns with the results from magnetic susceptibility and specific heat. Collectively, these findings point to a quantum disordered ground state with persistent spin dynamics, reminiscent of QSL behaviors. Our work provides a promising platform for further exploration of quantum magnetism in this new disorder-free system. Copyright © 2025, The Authors. All rights reserved.

关键词： Quantum entanglement

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Critical evaluation of extracellular polymeric substances extraction methods: Extraction efficiency, molecular characteristics, and heavy metals binding properties

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science of the Total Environment 2025年 959卷 178345页

作者： Ou, Bei Hu, Xueyang Yu, Wenbo Meng, Fanhao Li, Wen Liang, Sha Yuan, Shushan Duan, Huabo Hou, Huijie Xiao, Keke 1037 Luoyu Road Hubei Wuhan430074 China Hubei Provincial Engineering Laboratory of Solid Waste Treatment Disposal and Recycle Technology Hubei Wuhan430074 China Hubei Provincial Research Center of Water Quality Safety and Water Pollution Control Engineering Technology Hubei Wuhan430074 China State Key Laboratory of Coal Combustion Huazhong University of Science and Technology Hubei Wuhan430074 China Environmental Science and Engineering Program Guangdong Technion-Israel Institute of Technology 241 Daxue Road Guangdong Shantou515063 China

Extracellular polymeric substances (EPS) significantly influence the properties and performance of waste activated sludge. Various pretreatment protocols with different extraction efficiency and characteristics of EPS have been reported, which markedly impact subsequent treatment and disposal of sewage sludge. This study systematically assesses the EPS properties from twelve extraction pretreatment methods. The organic and inorganic matters content, cell lysis, basic physicochemical property, molecular weight distribution, and fluorescence properties of extracted EPS were determined. Physical extraction methods (Centrifugation, Heat, and Ultrasound) were relatively mild, resulting in lower extraction of organic matter contents from EPS (3 Da) generation. Chemical extraction methods offered efficient EPS extraction with the different degrees of cell lysis, but it would introduce chemical reagent residues in EPS. Among those extraction methods, EPS extracted by cation exchange resin (CER) method had uniform and abundant molecular weight matters and fluorescence matters distribution. After dialysis, the residual Na and other metal elements could be significantly removed. Then, the fluorescence quenching effect of Cu(II) and Zn(II) at 400 μM on the Bound-EPS after dialysis increased up to the maximum value of 65 % and 30 %, respectively, compared to that without dialysis. It indicates that dialysis coupled with CER extracted EPS has a well extraction efficiency and can maintain the original state of EPS for the subsequent investigation. © 2024 Elsevier B.V.

关键词： Fluorescence quenching

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Direct Measurement of Acoustic Spectral Density and Fractional Topological Charge

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Physical Review Applied 2023年第3期19卷 034073-034073页

作者： Hao Ge Zi-Wei Long Xiang-Yuan Xu Jin-Guo Hua Yang Liu Bi-Ye Xie Jian-Hua Jiang Ming-Hui Lu Yan-Feng Chen National Laboratory of Solid State Microstructures & Department of Materials Science and Engineering Nanjing University Nanjing Jiangsu 210093 China Institute of Theoretical and Applied Physics School of Physical Science and Technology & Collaborative Innovation Center of Suzhou Nano Science and Technology Soochow University 1 Shizi Street Suzhou 215006 China Key Laboratory of Advanced Optical Manufacturing Technologies of Jiangsu Province & Key Laboratory of Modern Optical Technologies of Ministry of Education Soochow University Suzhou 215006 China School of Science and Engineering The Chinese University of Hong Kong Shenzhen 518172 China Jiangsu Key Laboratory of Artificial Functional Materials Nanjing University Nanjing Jiangsu 210093 China

LDOS is a fundamental spectral property that plays a central role in various physical phenomena, such as wave-matter interactions and spontaneous emissions. The role of LDOS in acoustics was uncovered only in recent years and the measurement of acoustic LDOS has not yet been achieved. Here, we report on the direct measurement of the LDOS in acoustic systems. The acoustic LDOS is quantified here through the measurement of the volume flow rate and the acoustic pressure with a local excitation-probe configuration. Based on this method, we detect the LDOS in the one-dimensional acoustic Su-Schrieffer-Heeger model and observe the fractional topological charge of the system. Our work unveils the role of the LDOS in acoustic phenomena and paves the way toward characterizing and tailoring the LDOS in acoustic systems, which holds promise for applications in acoustic emission control, energy localization, and wave-matter interaction.

关键词： Acoustic metamaterials Acoustic wave phenomena Density of states Metrology Spontaneous emission Topological phases of matter Acoustic techniques Particle image velocimetry

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Recent progresses on perovskite quantum dots patterning techniques for color conversion layer in micro-LED displays

Next Nanotechnology

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Next Nanotechnology 2024年 5卷

作者： Fan, Xiaotong Yang, Xiao Kong, Xuemin Zhang, Tianqi Wang, Shuli Lin, Yue Chen, Zhong Department of Electronic Science Fujian Engineering Research Center for Solid-State Lighting Xiamen University Fujian Xiamen 361005 China Innovation Laboratory for Sciences and Technologies of Energy Materials of Fujian Province (IKKEM) Fujian Xiamen 361005 China Institute of Electromagnetics and Acoustics School of Electronic Science and Engineering Xiamen University Fujian Xiamen 361005 China

Micro light-emitting diodes (micro-LEDs) are considered crucial for the next-generation display technology. However, the high cost of large-scale transfer technology and the lack of maturity in full-color technology have hindered the availability of mature products. The perovskite quantum dot (PQD) material offers a promising solution for achieving full-color capabilities in micro-LED displays. This review article aims to provide an overview on the latest progresses on PQD full-color technology for micro-LEDs. The review covers a variety of patterning techniques, including photolithography, inkjet printing, microfluidic processing, and laser processing, as well as the research on intrinsic stability of PQDs. Finally, the current drawbacks and solutions of PQD color conversion micro-LEDs are discussed, and the future research prospects in this field are anticipated. © 2024 The Authors

关键词： Color conversion layer Full-color display Micro-LED Patterning technique Perovskite quantum dot

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Even-integer Quantum Hall Effect in an Oxide Caused by Hidden Rashba Effect

arXiv

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arXiv 2024年

作者： Wang, Jingyue Huang, Junwei Kaplan, Daniel Zhou, Xuehan Tan, Congwei Zhang, Jing Jin, Gangjian Cong, Xuzhong Zhu, Yongchao Gao, Xiaoyin Liang, Yan Zuo, Huakun Zhu, Zengwei Zhu, Ruixue Stern, Ady Liu, Hongtao Gao, Peng Yan, Binghai Yuan, Hongtao Peng, Hailin Center for Nanochemistry Beijing Science and Engineering Center for Nanocarbons Beijing National Laboratory for Molecular Sciences College of Chemistry and Molecular Engineering Peking University Beijing100871 China National Laboratory of Solid State Microstructures Collaborative Innovation Center of Advanced Microstructures College of Engineering and Applied Sciences Jiangsu Key Laboratory of Artificial Functional Materials Nanjing University Nanjing210000 China Department of Condensed Matter Physics Weizmann Institute of Science Rehovot7610001 Israel Center for Materials Theory Department of Physics and Astronomy Rutgers University PiscatawayNJ08854 United States Wuhan National High Magnetic Field Center School of Physics Huazhong University of Science and Technology Wuhan430074 China International Center for Quantum Materials and Electron Microscopy Laboratory School of Physics Peking University Beijing100871 China

In the presence of high magnetic field, quantum Hall systems usually host both even- and odd-integer quantized states because of lifted band degeneracies. Selective control of these quantized states is challenging but essential to understand the exotic ground states and manipulate the spin textures. Here, we study the quantum Hall effect in Bi2O2Se thin films. In magnetic fields as high as 50 T, we observe only even-integer quantum Hall states, but no sign of odd-integer states. However, when reducing the thickness of the epitaxial Bi2O2Se film to one unit cell, we observe both odd- and even-integer states in this Janus (asymmetric) film grown on SrTiO3. By means of a Rashba bilayer model based on ab initio band structures of Bi2O2Se thin films, we can ascribe the absence of odd-integer states in thicker films to the hidden Rasbha effect, where the local inversion symmetry breaking in two sectors of the [Bi2O2]2+ layer yields opposite Rashba spin polarizations, which compensate with each other. In the one unit cell Bi2O2Se film grown on SrTiO3, the asymmetry introduced by top surface and bottom interface induces a net polar field. The resulting global Rashba effect lifts the band degeneracies present in the symmetric case of thicker films. © 2024, CC BY.

关键词： Quantum Hall effect

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