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Magneto-optical Kerr spectra of gold induced by spin accumulation

Physical Review B 2022年第1期106卷 014410-014410页

作者： Víctor H. Ortiz Sinisa Coh Richard B. Wilson Department of Mechanical Engineering and Materials Science and Engineering Program University of California Riverside 92521 CA United States

We report the magneto-optic Kerr effect (MOKE) angle of Au magnetically excited by spin accumulation. We perform time-resolved polar MOKE measurements on Au/Co heterostructures. In our experiment, the ultrafast optical excitation of the Co drives spin accumulation into an adjacent Au layer. The spin accumulation, together with spin-orbit coupling, leads to nonzero terms in the off-diagonal conductivity tensor of Au, which we measure by recording the polarization and ellipticity of light reflected from the Au surface for photon energies between 1.3 and 3.1 eV. In a narrow energy range near the interband transition threshold of Au, the sensitivity to magnetization measured exceeds 1μradperA/m. In the photon energy interval of 0.6–4.4 eV, the maximum value for transition ferromagnetic metals like Ni are <10nradperA/m, while predicted values for heavy metals like Pt or W are <13nradperA/m. The exceptional sensitivity of the optical properties of Au to spin magnetic moments make Au an exceptionally sensitive optical magnetometer, with potential applications in the development of optospintronic technologies.

关键词： Density of states Magneto-optical Kerr effect Spin accumulation Ultrafast magnetic effects

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Evolution of hierarchical petal-like 3D SnS2 as high-performance electrode materials for supercapacitor applications

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materials Today: Proceedings 2022年 67卷 1039-1042页

作者： Kumar, Niraj Bhusan Sahoo, Bibhuti Chandra Sahu, Krushna Kumar Sahoo, Naresh Naik, Brundabana Soam, Ankur Kumar, Rahul Tripathi, Abhishek Kumar Sahoo, Prasanta Maharashtra Pune 411025 India Department of Mechanical Engineering Siksha ‘O’ Anusandhan Deemed to be University Odisha Bhubaneswar 751030 India Department of Chemistry Environmental Science and Technology Program Siksha ‘O’ Anusandhan Deemed to be University Odisha Bhubaneswar 751030 India Department of Energy Science and Engineering IIT Delhi New Delhi 110016 India Department of Metallurgical and Materials Engineering Malaviya National Institute of Technology Jaipur Jaipur 302017 India

A simple one-step solvothermal approach has been adopted for the synthesis of SnS2. SEM shows hierarchically SnS2 with petal-like 3-dimensional layer structures because of this process. In this investigation, the as-prepared electrode material have an excellent specific capacitance of 721F g−1 at 1 mVs−1, indicating extraordinary performance. The improved electrochemical performance is because to unique ultrathin petal discrete structure, which provides increased electrolyte/electrode interface, high active sites, rapid ion/electron transfer, and short diffusion distances. A manufactured symmetric solid-state supercapacitor (SSC) device also has a large capacity to operate commercial LEDs, which allows for the assessment of its practical applicability in device-level application. According to the findings of this work, suitably layered 3D SnS2 electrode materials could be a promising route for the development of environmentally friendly energy storage applications. © 2022

关键词： Supercapacitor

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Polyetheretherketone with citrate potentiated influx of copper boosts osteogenesis,angiogenesis,and bacteria-triggered antibacterial abilities

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Journal of materials science & Technology 2021年第12期71卷 31-43页

作者： Jianglong Yan Dandan Xiab Pan Xionga Yangyang Li Wenhao Zhou Qiyao Li Pei Wang Yufeng Zheng Yan Cheng Academy for Advanced Interdisciplinary Studies Peking UniversityBeijing 100871China Department of Materials Science and Engineering College of EngineeringPeking UniversityBeijing 100871China Department of Biomedical Engineering Materials Research InstituteHuck Institutes of the Life SciencesThe Pennsylvania State UniversityUniversity ParkPA 16802USA The Science and Technology Bureau of Chengdu Chengdu Administration of Foreign Experts AffairsChengdu 610042China

A well designed coating for polyetheretherketone(PEEK)implants can provide enough support to overcome crucial medical challenges,which are insufficient osseointegration and high rate of ***,we utilize the co-deposition of polydopamine(PDA)and copper-citrate nanoclusters to construct a p H-responsive coating on porous PEEK for synergistic bone regeneration,vascular formation and ***,this PDA coating released high dose of copper and citrate at lower p H value,which increased intracellular copper content,boosted production of reactive oxygen species and severe damage of protein,leading to killing of 93%planktonic bacterial and eradication of adherent *** p H of 7.4,the release of copper and citrate were in a slow and sustained behavior,synergistically enhanced vascular formation potential and osteodiffereration of Ad-MSC in *** implanted in rabbit tibia for 6 and 12 weeks,the micro-CT evaluation and histological analysis consistently highlighted the ability of this PDA coating to increase new bone formation adjacent to coated PEEK implant and enhance bone-implant interfacial *** results were proven to be related to the synergistic effect that citrate facilitated a 2-fold influx of copper into cells,which not only enhanced the bacteria-killing ability but also encouraged bone regeneration of *** present work provides an effective method to control infections while promoting osseointegration simultaneously,which will show tremendous clinical application and can be a solution to current challenges facing orthopedics.

关键词： Citrate Copper Potentiated influx Bone regeneration Angiogenesis Bacteria-triggered coating

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Double crosslinked biomimetic composite hydrogels containing topographical cues and WAY-316606 induce neural tissue regeneration and functional recovery after spinal cord injury

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Bioactive materials 2023年第6期24卷 331-345页

作者： Xingchang Zhao Xianzhe Lu Kai Li Shiqiang Song Zhaohui Luo Chuanchuan Zheng Chengliang Yang Xiumei Wang Liqiang Wang Yujin Tang Chong Wang Jia Liu Department of Orthopaedics Affiliated Hospital of Youjiang Medical University for NationalitiesBaiseGuangxiChina Guangxi Key Laboratory of Basic and Translational Research of Bone and Joint Degenerative Diseases Guangxi Biomedical Materials Engineering Research Center for Bone and Joint Degenerative DiseasesBaiseGuangxiChina Academy of Orthopedics Guangdong ProvinceGuangdong Provincial Key Laboratory of Bone and Joint Degeneration DiseasesThe Third Affiliated Hospital of Southern Medical UniversityGuangzhouChina Youjiang Medical University for Nationalities BaiseGuangxiChina School of Mechanical Engineering Dongguan University of TechnologySongshan LakeDongguanGuangdongChina State Key Laboratory of New Ceramics and Fine Processing Key Laboratory of Advanced Materials of Ministry of EducationSchool of Materials Science and EngineeringTsinghua UniversityBeijingChina State Key Laboratory of Metal Matrix Composites School of Material Science and EngineeringShanghai Jiao Tong UniversityShanghaiChina

Spinal cord injury(SCI)is an overwhelming and incurable disabling condition,for which increasing forms of multifunctional biomaterials are being tested,but with limited *** promising material should be able to fill SCI-induced cavities and direct the growth of new neurons,with effective drug loading to improve the local micro-organism environment and promote neural tissue *** this study,a double crosslinked biomimetic composite hydrogel comprised of acellularized spinal cord matrix(ASCM)and gelatin-acrylated-β-cyclodextrin-polyethene glycol diacrylate(designated G-CD-PEGDA)hydrogel,loaded with WAY-316606 to activate canonical Wnt/β-catenin signaling,and reinforced by a bundle of three-dimensionally printed aligned polycaprolactone(PCL)microfibers,was *** G-CD-PEGDA component endowed the composite hydrogel with a dynamic structure with a self-healing capability which enabled cell migration,while the ASCM component promoted neural cell affinity and *** diffusion of WAY-316606 could recruit endogenous neural stem cells and improve neuronal *** aligned PCL microfibers guided neurite elongation in the longitudinal *** behavior studies further showed that the composite hydrogel could significantly recover the motor function of rats after *** study provides a proficient approach to produce a multifunctional system with desirable physiological,chemical,and topographical cues for treating patients with SCI.

关键词： Spinal cord injury 3D printing PCL oriented fibers WAY-316606 Wnt/β-catenin signaling

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The role of input imaging combination and ADC threshold on segmentation of acute ischemic stroke lesion using U-Net

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European Radiology 2023年第9期33卷 6157-6167页

作者： Li, Ya-Hui Lin, Shao-Chieh Chung, Hsiao-Wen Chang, Chia-Ching Peng, Hsu-Hsia Huang, Teng-Yi Shen, Wu-Chung Tsai, Chon-Haw Lo, Yu-Chien Lee, Tung-Yang Juan, Cheng-Hsuan Juan, Cheng-En Chang, Hing-Chiu Liu, Yi-Jui Juan, Chun-Jung Graduate Institute of Biomedical Electronics and Bioinformatics National Taiwan University Taipei Taiwan Department of Medical Imaging China Medical University Hsinchu Hospital No. 199 Sec. 1 Xinglong Rd. Zhubei City Hsinchu County 302 Hsinchu Taiwan Ph.D. Program in Electrical and Communication Engineering Feng Chia University Taichung Taiwan Department of Electrical Engineering National Taiwan University Taipei Taiwan Department of Management Science National Yang Ming Chiao Tung University Hsinchu Taiwan Department of Biomedical Engineering and Environmental Sciences National Tsing Hua University Hsinchu Taiwan Department of Electrical Engineering National Taiwan University of Science and Technology Taipei Taiwan Department of Radiology School of Medicine College of Medicine China Medical University Taichung Taiwan Department of Medical Imaging Medical University Hospital Taichung Taiwan Department of Neurology China Medical University Hospital Taichung Taiwan Cheng Ching Hospital Taichung Taiwan Master’s Program of Biomedical Informatics and Biomedical Engineering Feng Chia University Taichung Taiwan Department of Automatic Control Engineering Feng Chia University No. 100 Wenhwa Rd. Seatwen Taichung 40724 Taiwan Department of Biomedical Engineering The Chinese University of Hong Kong ERB1112 11/F William M.W. Mong Engineering Building N.T Shatin Hong Kong Multi-Scale Medical Robotics Center The Chinese University of Hong Kong N.T Shatin Hong Kong Department of Biomedical Engineering National Defense Medical Center Taipei Taiwan Department of Computer Science and Information Engineering National Taiwan University Taipei Taiwan

Background: To evaluate the effect of the weighting of input imaging combo and ADC threshold on the performance of the U-Net and to find an optimized input imaging combo and ADC threshold in segmenting acute ischemic stroke (AIS) lesion. Methods: This study retrospectively enrolled a total of 212 patients having AIS. Four combos, including ADC-ADC-ADC (AAA), DWI-ADC-ADC (DAA), DWI-DWI-ADC (DDA), and DWI-DWI-DWI (DDD), were used as input images, respectively. Three ADC thresholds including 0.6, 0.8 and 1.8 × 10^–3 mm²/s were applied. Dice similarity coefficient (DSC) was used to evaluate the segmentation performance of U-Nets. Nonparametric Kruskal–Wallis test with Tukey–Kramer post-hoc tests were used for comparison. A p <.05 was considered statistically significant. Results: The DSC significantly varied among different combos of images and different ADC thresholds. Hybrid U-Nets outperformed uniform U-Nets at ADC thresholds of 0.6 × 10^–3 mm²/s and 0.8 × 10^–3 mm²/s (p <.001). The U-Net with imaging combo of DDD had segmentation performance similar to hybrid U-Nets at an ADC threshold of 1.8 × 10^–3 mm²/s (p =.062 to 1). The U-Net using the imaging combo of DAA at the ADC threshold of 0.6 × 10^–3 mm²/s achieved the highest DSC in the segmentation of AIS lesion. Conclusions: The segmentation performance of U-Net for AIS varies among the input imaging combos and ADC thresholds. The U-Net is optimized by choosing the imaging combo of DAA at an ADC threshold of 0.6 × 10^–3 mm²/s in segmentating AIS lesion with highest DSC. Key Points: • Segmentation performance of U-Net for AIS differs among input imaging combos. • Segmentation performance of U-Net for AIS differs among ADC thresholds. • U-Net is optimized using DAA with ADC = 0.6 × 10^–3mm²/s. © 2023, The Author(s), under exclusive licence to European Society of Radiology.

关键词： Deep Learning Diffusion Magnetic Resonance Imaging Ischemic Stroke Neural Networks, Computer Retrospective Study

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engineering of dendritic dopant-free hole transport molecules:enabling ultrahigh fill factor in perovskite solar cells with optimized dendron construction

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science China Chemistry 2021年第1期64卷 41-51页

作者： Wei Chen Yang Wang Bin Liu Yajun Gao Ziang Wu Yongqiang Shi Yumin Tang Kun Yang Yujie Zhang Weipeng Sun Xiyuan Feng Frédéric Laquai Han Young Woo Aleksandra B.Djurisic Xugang Guo Zhubing He Department of Materials Science and Engineering Southern University of Science and TechnologyShenzhen 518055China Department of Physics The University of Hong KongPokfulamHong KongChina King Abdullah University of Science and Technology KAUST Solar CenterPhysical Sciences and Engineering DivisionMaterial Science and Engineering ProgramThuwal 23955-6900Kingdom of Saudi Arabia Department of Chemistry Korea UniversitySeoul 02841South Korea

Developing dopant-free hole-transporting materials(HTMs)for high-performance perovskite solar cells(PVSCs)has been a very active research topic in recent years since HTMs play a critical role in optimizing interfacial charge carrier kinetics and in turn determining device ***,a novel dendritic engineering strategy is first utilized to design HTMs with a D-A type molecular framework,and diphenylamine and/or carbazole is selected as the building block for constructing *** HTMs show good thermal stability and excellent film morphology,and the key optoelectronic properties could be fine-tuned by varying the dendron *** them,MPA-Cz-BTI and MCz-Cz-BTI exhibit an improved interfacial contact with the perovskite active layer,and non-radiative recombination loss and charge transport loss can be effectively ***,high power conversion efficiencies(PCEs)of 20.8%and 21.35%are achieved for MPA-Cz-BTI and MCz-Cz-BTI based devices,respectively,accompanied by excellent long-term storage *** encouragingly,ultrahigh fill factors of 85.2%and 83.5%are recorded for both devices,which are among the highest values reported to *** work demonstrates the great potential of dendritic materials as a new type of dopant-free HTMs for high-performance PVSCs with excellent FF.

关键词： dendritic molecules hole-transporting materials dopant-free ultrahigh fill factor perovskite solar cells

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D^(6h)Symmetric Radical Donor-Acceptor Nanographene Modulated Interfacial Carrier Transfer for High-Performance Perovskite Solar Cells

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CCS Chemistry 2023年第9期5卷 2159-2170页

作者： Can Wang Yifeng Gao Zhen-Lin Qiu Ping-Ping Sun Naoyuki Shibayama Zilong Zhang Qiu Xiong Fangbin Ren Shui-Yang Lien Lusheng Liang Jiaoxia Zhang Yuan-Zhi Tan Peng Gao CAS Key Laboratory of Design and Assembly of Functional Nanostructures Fujian Provincial Key Laboratory of NanomaterialsFujian Institute of Research on the Structure of MatterChinese Academy of SciencesFuzhouFujian 350002 Laboratory for Advanced Functional Materials Xiamen Institute of Rare Earth MaterialsHaixi InstituteChinese Academy of SciencesXiamen 361021 University of Chinese Academy of Sciences Beijing 100049 School of Materials Science and Engineering Jiangsu University of Science and TechnologyZhenjiang 212003 Collaborative Innovation Center of Chemistry for Energy Materials State Key Laboratory for Physical Chemistry of Solid SurfacesEngineering Research Center for Nano-Preparation Technology of Fujian ProvinceDepartment of ChemistryCollege of Chemistry and Chemical EngineeringXiamen UniversityXiamen 361005 Department of Chemistry School of ScienceHainan UniversityHaikou 570228 Faculty of Biomedical Engineering Graduate School of EngineeringToin University of YokohamaYokohamaKanagawa 225-8503 Xiamen University of Technology Xiamen 361024

Imbalanced charge-carrier extraction remains an issue aggravating interfacial charge accumulation and *** hopping transport channels could accelerate the extraction of ***,we demonstrated an effective“bridging interface”strategy between the perovskite/2,2′,7,7′-tetrakis(N,N-di-pmethoxyphenylamine)-9,9′-spirobifluorene(spiro-OMeTAD)that modulates interfacial charge transfer and improves hole mobility using radical-containing donor-acceptor nanographenes(D-A NGs)possessing electron-deficient perchlorinated NGs and electron-rich aniline *** fully delocalized backbone of nanographene formed a conjugated bridge for intermolecular charge transfer and generated stable radical cations,verified by electron spin *** andπ-πstacking orientation of D-A NGs also provided advantageous hopping transport *** favorable charge transfer within D-A NGs,systematic explorations indicated a strong interface coupling and noticeable charge transfer across the D-A NGs and perovskite interface,where electrons would flow from D-A NGs to perovskite,and holes would flow from perovskite to D-A ***,the hole mobility of spiro-OMeTAD was also enhanced because the D-A NGs would diffuse into the spiro-OMeTAD *** a result,planar n-i-p perovskite solar cellsmodified byD-ANG-OMe/D-ANG-tBudeliveredchampion power conversion efficiencies(PCEs)of 23.25%and 23.51%,respectively.

关键词： perovskite solar cell radicals donor-acceptor nanographene hole mobility interfacial charge transfer

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Dynamic Colloidal Photonic Crystal Hydrogels with Self-Recovery and Injectability

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Research 2021年第1期2021卷 575-585页

作者： Yue Ma Peiyan He Wanli Xie Qiang Zhang Weiling Yin Jianming Pan Miao Wang Xin Zhao Guoqing Pan Institute for Advanced Materials School of Materials Science and EngineeringJiangsu UniversityZhenjiangJiangsu 212013China School of Chemistry and Chemical Engineering Jiangsu UniversityZhenjiangJiangsu 212013China Jiangsu Agrochem Laboratory ChangzhouJiangsu 213022China Department of Biomedical Engineering The Hong Kong Polytechnic UniversityHung HomHong KongChina

Simulation of self-recovery and diversity of natural photonic crystal(PC)structures remain great challenges for artificial PC *** by the dynamic characteristics of PC nanostructures,here,we present a new strategy for the design of hydrogel-based artificial PC materials with reversible interactions in the periodic *** dynamic PC hydrogels,derived from self-assembled microgel colloidal crystals,were tactfully constructed by reversible crosslinking of adjacent microgels in the ordered structure via phenylboronate covalent *** proof of concept,three types of dynamic colloidal PC hydrogels with different structural colors were *** the hydrogels showed perfect self-healing ability against physical ***,dynamic crosslinking within the microgel crystals enabled shear-thinning injection of the PC hydrogels through a syringe(indicating injectability or printability),followed by rapid recovery of the structural *** short,in addition to the great significance in biomimicry of self-healing function of natural PC materials,our work provides a facile strategy for the construction of diversified artificial PC materials for different applications such as chem-/biosensing,counterfeit prevention,optical display,and energy conversion.

关键词： materials reversible crosslinking

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Design and Simulation of Clad-free Optical Fiber Evanescent Field Sensor

Design and Simulation of Clad-free Optical Fiber Evanescent ...

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2024 Laser science, LS 2024

作者： Jaiswal, Arun Sharma, Akanksha Singhal, Aman Yang, Zhenxu Xu, Zhejun Liu, Xiaochen Saxena, Sumit Shukla, Shobha Yong, Ken-Tye School of Biomedical Engineering Faculty of Engineering The University of Sydney SydneyNSW2006 Australia The University of Sydney Nano Institute The University of Sydney SydneyNSW2006 Australia The Biophotonics and Mechanobioengineering Laboratory Faculty of Engineering The University of Sydney SydneyNSW2006 Australia Water Innovation Center: Technology Research & Education Indian Institute of Technology Bombay MH Mumbai400076 India Nanostructures Engineering and Modeling Laboratory Department of Metallurgical Engineering and Materials Science Indian Institute of Technology Bombay MH Mumbai400076 India

We report design and theoretical evaluation of clad-free tapered optical fiber for development of evanescent field sensors with large evanescent fields exhibiting capabilities to sense media with refractive index vary... 详细信息

关键词： Optical fibers

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Sequence-Defined Nanotubes Assembled from IR780-Conjugated Peptoids for Chemophototherapy of Malignant Glioma

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Research 2021年第1期2021卷 1379-1390页

作者： Xiaoli Cai Mingming Wang Peng Mu Tengyue Jian Dong Liu Shichao Ding Yanan Luo Dan Du Yang Song Chun-Long Chen Yuehe Lin School of Mechanical and Materials Engineering Washington State UniversityPO Box 642920 PullmanWashington 99164USA Physical Sciences Division Pacific Northwest National LaboratoryRichlandWA 99352USA Department of Mechanical Engineering and Materials Science and Engineering Program State University of New YorkBinghamtonNew York 13902USA

Near-infrared(NIR)laser-induced phototherapy through NIR agents has demonstrated the great potential for cancer ***,insufficient tumor killing due to the nonuniform heat or cytotoxic singlet oxygen(1 O2)distribution over tumors from phototherapy results in tumor recurrence and inferior *** achieve high tumor killing efficacy,one of the solutions is to employ the combinational treatment of phototherapy with other modalities,especially with chemotherapeutic *** this paper,a simple and effective multimodal therapeutic system was designed via combining chemotherapy,photothermal therapy(PTT),and photodynamic therapy(PDT)to achieve the polytherapy of malignant glioma which is one of the most aggressive tumors in the ***-780(IR780)dye-labeled tube-forming peptoids(PepIR)were synthesized and self-assembled into crystalline nanotubes(PepIR nanotubes).These PepIR nanotubes showed an excellent efficacy for PDT/PTT because the IR780 photosensitizers were effectively packed and separated from each other within crystalline nanotubes by tuning IR780 density;thus,a self-quenching of these IR780 molecules was significantly ***,the efficient DOX loading achieved due to the nanotube large surface area contributed to an efficient and synergistic chemotherapy against glioma *** the unique properties of peptoids and peptoid nanotubes,we believe that the developed multimodal DOX-loaded PepIR nanotubes in this work offer great promises for future glioma therapy in clinic.

关键词： chemotherapy IR780 modal

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