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Seebeck coefficient in a cuprate superconductor: Particle-hole asymmetry in the strange metal phase and Fermi surface transformation in the pseudogap phase

arXiv

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arXiv 2021年

作者： Gourgout, A. Grissonnanche, G. Laliberté, F. Ataei, A. Chen, L. Verret, S. Zhou, J.-S. Mravlje, J. Georges, A. Doiron-Leyraud, N. Taillefer, Louis Institut Quantique Département de physique and RQMP Université de Sherbrooke SherbrookeQC Canada Laboratory of Atomic and Solid State Physics Cornell University IthacaNY United States Kavli Institute at Cornell for Nanoscale Science IthacaNY United States Materials Science and Engineering Program/Mechanical Engineering University of Texas - Austin AustinTX United States Department of Theoretical Physics Institute Jožef Stefan Ljubljana Slovenia Collège de France 11 place Marcelin Berthelot Paris France Center for Computational Quantum Physics Flatiron Institute New YorkNY United States CPHT CNRS Ecole Polytechnique IP Paris Palaiseau France DQMP Université de Genève Geneva Switzerland Canadian Institute for Advanced Research TorontoON Canada

We report measurements of the Seebeck effect in both the ab plane (Sa) and along the c axis (Sc) of the cuprate superconductor La1:6-xNd0:4SrxCuO4(Nd-LSCO), performed in magnetic fields large enough to suppress superconductivity down to low temperature. We use the Seebeck coefficient as a probe of the particle-hole asymmetry of the electronic structure across the pseudogap critical doping p∗ = 0:23. Outside the pseudogap phase, at p = 0:24 > p∗, we observe a positive and essentially isotropic Seebeck coefficient as T → 0. That S > 0 at p = 0:24 is at odds with expectations given the electronic band structure of Nd-LSCO above p∗ and its known electron-like Fermi surface. We can reconcile this observation by invoking an energy-dependent scattering rate with a particle-hole asymmetry, possibly rooted in the non-Fermi liquid nature of cuprates just above p∗. Inside the pseudogap phase, for p Copyright © 2021, The Authors. All rights reserved.

关键词： Electronic structure

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Influence of Magnetic Fields on Electrochemical Reactions of Redox Cofactor Solutions

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Angewandte Chemie 2021年第33期133卷

作者： Jimin Park Florian Koehler Georgios Varnavides Marc-Joseph Antonini Prof. Dr. Polina Anikeeva Department of Materials Science and Engineering Massachusetts Institute of Technology Cambridge MA 02139 USA Research Laboratory of Electronics and McGovern Institute for Brain Research Massachusetts Institute of Technology Cambridge MA 02139 USA Department of Electrical Engineering and Computer Science Massachusetts Institute of Technology Cambridge MA 02139 USA Harvard/MIT Health Science & Technology Graduate Program Cambridge MA 02139 USA Department of Brain and Cognitive Sciences Massachusetts Institute of Technology Cambridge MA 02139 USA

Redox cofactors mediate many enzymatic processes and are increasingly employed in biomedical and energy applications. Exploring the influence of external magnetic fields on redox cofactor chemistry can enhance our understanding of magnetic-field-sensitive biological processes and allow the application of magnetic fields to modulate redox reactions involving cofactors. Through a combination of experiments and modeling, we investigate the influence of magnetic fields on electrochemical reactions in redox cofactor solutions. By employing flavin mononucleotide (FMN) cofactor as a model system, we characterize magnetically induced changes in Faradaic currents. We find that radical pair intermediates have negligible influence on current increases in FMN solution upon application of a magnetic field. The dominant mechanism underlying the observed current increases is the magneto-hydrodynamic effect. We extend our analyses to other diffusion-limited electrochemical reactions of redox cofactor solutions and arrive at similar conclusions, highlighting the opportunity to use this framework in redox cofactor chemistry.

关键词： electrochemistry magnetic field effects magneto-hydrodynamic effect radicals redox cofactors

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Ultra-Cold Cryogenic TEM Sample Holder with Liquid Helium and High Stability

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Microscopy and Microanalysis 2024年第SUPPLEMENT_1期30卷

作者： Gates, Maya Rennich, Emily Sung, Suk Hyun Agarwal, Nishkarsh Kerns, Robert Hovden, Robert Baggari, Ismail El Department of Mechanical Engineerin University of Michigan Ann Arbor MI USA Rowland Institute at Harvard University Cambridge MA USA Department of Materials Science & Engineering University of Michigan Ann Arbor MI USA Michigan Center for Materials Characterization University of Michigan Ann Arbor MI USA Applied Physics Program University of Michigan Ann Arbor MI USA

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Photovoltaic Devices: High Performance Roll‐to‐Roll Produced Fullerene‐Free Organic Photovoltaic Devices via Temperature‐Controlled Slot Die Coating (Adv. Funct. Mater. 6/2019)

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Advanced Functional materials 2019年第6期29卷

作者： Seok‐In Na You‐Hyun Seo Yoon‐Chae Nah Seok‐Soon Kim Hyojung Heo Jueng‐Eun Kim Nicholas Rolston Reinhold H. Dauskardt Mei Gao Youngu Lee Doojin Vak CSIRO Manufacturing Bag 10 Clayton South Victoria 3168 Australia Professional Graduate School of Flexible and Printable Electronics and Polymer Materials Fusion Research Center Chonbuk National University Deokjin‐dong 664‐14 Jeonju‐si Jeollabuk‐do 561‐756 Republic of Korea Interdisciplinary Program in Creative Engineering School of Energy Materials and Chemical Engineering Korea University of Technology and Education Cheonan 31253 Korea Department of Nano & Chemical Engineering Kunsan National University 290–2 Miryong‐dong Gunsan‐si Jeollabuk‐do 573‐701 Republic of Korea Department of Energy Science and Engineering Daegu Gyeongbuk Institute of Science and Technology (DGIST) Daegu 42988 Korea Department of Applied Physics Stanford University Stanford CA 94305 USA Department of Materials Science and Engineering Stanford University Stanford CA 94305 USA

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Hybrid Vesicles Enable Mechano-Responsive Hydrogel Degradation

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Angewandte Chemie 2023年第41期135卷

作者： Sung-Won Hwang Chung-Man Lim Prof. Cong Truc Huynh Hossein Moghimianavval Prof. Nicholas A. Kotov Prof. Eben Alsberg Prof. Allen P. Liu Department of Chemical Engineering University of Michigan Ann Arbor MI 48109 USA Department of Materials Science and Engineering University of Michigan Ann Arbor MI 48109 USA Department of Biomedical Engineering University of Illinois Chicago Chicago IL 60612 USA Department of Mechanical Engineering University of Michigan Ann Arbor MI 48109 USA Departments of Biomedical Engineering Macromolecular Science and Engineering Biointerfaces Institute University of Michigan Ann Arbor MI 48109 USA Departments of Orthopedic Surgery Pharmacology and Regenerative Medicine and Mechanical and Industrial Engineering University of Illinois Chicago Chicago IL 60612 USA Departments of Biomedical Engineering Biophysics Cellular and Molecular Biology Program Applied Physics Program University of Michigan Ann Arbor MI 48109 USA

Stimuli-responsive hydrogels are intriguing biomimetic materials. Previous efforts to develop mechano-responsive hydrogels have mostly relied on chemical modifications of the hydrogel structures. Here, we present a simple, generalizable strategy that confers mechano-responsive behavior on hydrogels. Our approach involves embedding hybrid vesicles, composed of phospholipids and amphiphilic block copolymers, within the hydrogel matrix to act as signal transducers. Under mechanical stress, these vesicles undergo deformation and rupture, releasing encapsulated compounds that can control the hydrogel network. To demonstrate this concept, we embedded vesicles containing ethylene glycol tetraacetic acid (EGTA), a calcium chelator, into a calcium-crosslinked alginate hydrogel. When compressed, the released EGTA sequesters calcium ions and degrades the hydrogel. This study provides a novel method for engineering mechano-responsive hydrogels that may be useful in various biomedical applications.

关键词： Block Copolymers Functional Material Stimuli-Responsive Hydrogel Stress-Induced Degradation Vesicles

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Effects of Surface Roughness and Maximum Load on the Mechanical Properties of Cancellous Bone Measured by Nanoindentation

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MRS Online Proceedings Library 2004年第1期823卷 W8.5.1-W8.5.6页

作者： Donnelly, Eve Baker, Shefford P. Boskey, Adele L. van der Meulen, Marjolein C. H. Sibley School of Mechanical and Aerospace Engineering Cornell University Ithaca USA Department of Materials Science and Engineering Cornell University Ithaca USA Musculoskeletal Integrity Program Hospital for Special Surgery New York USA Department of Biochemistry Weill Medical College of Cornell University New York USA Graduate Program in Physiology Biophysics and Systems Biology Weill Medical College of Cornell University New York USA

Nanoindentation was used to assess the mechanical properties of lamellar and interlamellar tissue in dehydrated rabbit cancellous bone. The effects of surface roughness and maximum nanoindentation load on the measured mechanical properties were examined in two samples of differing surface roughness using maximum loads ranging from 250-3000 μN. As the ratio of indentation depth to surface roughness decreased below approximately 3:1, the variability in material properties increased substantially. At low loads, the indentation modulus of the lamellar bone was approximately 20% greater than that of the interlamellar bone, while at high loads the measured properties of both layers converged to an intermediate value. Relatively shallow indentations made on smooth surfaces revealed significant differences in the properties of lamellar and interlamellar bone that are consistent with microstructural observations of lamellar bone as more mineralized than interlamellar bone.

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Colloidal Synthesis of Silicon–Carbon Composite Material for Lithium‐Ion Batteries

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Angewandte Chemie 2017年第36期129卷

作者： Haiping Su Alejandro A. Barragan Linxiao Geng Donghui Long Licheng Ling Krassimir N. Bozhilov Lorenzo Mangolini Juchen Guo State Key Laboratory of Chemical Engineering East China University of Science and Technology Meilong Rd Shanghai 200237 P.R. China Department of Chemical and Environmental Engineering University of California Riverside 900 University Ave Riverside CA 92521 USA Department of Mechanical Engineering University of California Riverside USA Materials Science and Engineering Program University of California Riverside USA Central Facility for Advanced Microscopy and Microanalysis University of California Riverside USA

We report colloidal routes to synthesize silicon@carbon composites for the first time. Surface‐functionalized Si nanoparticles (SiNPs) dissolved in styrene and hexadecane are used as the dispersed phase in oil‐in‐water emulsions, from which yolk–shell and dual‐shell hollow SiNPs@C composites are produced via polymerization and subsequent carbonization. As anode materials for Li‐ion batteries, the SiNPs@C composites demonstrate excellent cycling stability and rate performance, which is ascribed to the uniform distribution of SiNPs within the carbon hosts. The Li‐ion anodes composed of 46 wt % of dual‐shell SiNPs@C, 46 wt % of graphite, 5 wt % of acetylene black, and 3 wt % of carboxymethyl cellulose with an areal loading higher than 3 mg cm −2 achieve an overall specific capacity higher than 600 mAh g −1 , which is an improvement of more than 100 % compared to the pure graphite anode. These new colloidal routes present a promising general method to produce viable Si–C composites for Li‐ion batteries.

关键词： Anodenmaterialien Emulsionen Kolloide Kompositmaterialien Lithiumionenbatterien

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Plasma-Derived Nanoclusters for Site-Specific Multimodality Photo/Magnetic Thrombus Theranostics

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Advanced Healthcare materials 2023年第28期12卷 e2301504页

作者： Liu, Chia-Hung Liu, Ming-Che Jheng, Pei-Ru Yu, Jiashing Fan, Yu-Jui Liang, Jia-Wei Hsiao, Yu-Cheng Chiang, Chih-Wei Bolouki, Nima Lee, Jyh-Wei Hsieh, Jang-Hsing Mansel, Bradley W Chen, Yan-Ting Nguyen, Hieu Trung Chuang, Er-Yuan Department of Urology School of Medicine College of Medicine Taipei Medical University 250 Wu-Hsing Street Taipei11031 Taiwan TMU Research Center of Urology and Kidney Taipei Medical University 250 Wu-Hsing Street Taipei11031 Taiwan Department of Urology Shuang Ho Hospital Taipei Medical University 291 Zhongzheng Road Zhonghe District New Taipei City23561 Taiwan Clinical Research Center Taipei Medical University Hospital Taipei11031 Taiwan School of Dental Technology College of Oral Medicine Taipei Medical University Taipei11031 Taiwan Graduate Institute of Biomedical Materials and Tissue Engineering International Ph.D. Program in Biomedical Engineering Graduate Institute of Biomedical Optomechatronics School of Biomedical Engineering Research Center of Biomedical Device Innovation Entrepreneurship Education Center College of Interdisciplinary Studies Taipei Medical University Taipei11031 Taiwan Department of Chemical Engineering College of Engineering National Taiwan University Taipei106 Taiwan Department of Orthopedics Taipei Medical University Taipei11031 Taiwan Department of Orthopedics Taipei Medical University Hospital Taipei11031 Taiwan Department of Physical Electronics Faculty of Science Masaryk University Brno60177 Czech Republic Department of Materials Engineering Ming Chi University of Technology New Taipei City24301 Taiwan Center for Plasma and Thin Film Technologies Ming Chi University of Technology New Taipei City24301 Taiwan National Synchrotron Radiation Research Center Hsinchu Science Park Hsinchu30076 Taiwan Department of Orthopedics and Trauma Faculty of Medicine University of Medicine and Pharmacy at Ho Chi Minh City Ho Chi Minh City700000 Viet Nam Cell Physiology and Molecular Image Research Center Taipei Medical University Wan Fang Hospital Taipei11696 Taiwan Precision Medicine and Translational Cancer Research Center Taipei Medical University Hospital Taipei11031 Taiwan

Traditional thrombolytic therapeutics for vascular blockage are affected by their limited penetration into thrombi, associated off-target side effects, and low bioavailability, leading to insufficient thrombolytic efficacy. It is hypothesized that these limitations can be overcome by the precisely controlled and targeted delivery of thrombolytic therapeutics. A theranostic platform is developed that is biocompatible, fluorescent, magnetic, and well-characterized, with multiple targeting modes. This multimodal theranostic system can be remotely visualized and magnetically guided toward thrombi, noninvasively irradiated by near-infrared (NIR) phototherapies, and remotely activated by actuated magnets for additional mechanical therapy. Magnetic guidance can also improve the penetration of nanomedicines into thrombi. In a mouse model of thrombosis, the thrombosis residues are reduced by ≈80% and with no risk of side effects or of secondary embolization. This strategy not only enables the progression of thrombolysis but also accelerates the lysis rate, thereby facilitating its prospective use in time-critical thrombolytic treatment. © 2023 Wiley-VCH GmbH.

关键词： Diseases

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Correction: Nucleic acid detection with single-base specificity integrating isothermal amplification and light-up aptamer probes

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Nanoscale 2024年第44期16卷 20774页

作者： Jaekyun Baek Jihyun Park Youngeun Kim Interdisciplinary Program in Bioengineering Seoul National University Seoul 08826 Republic of Korea. youngeunkim@snu.ac.kr. Research Institute of Advanced Materials Seoul National University Seoul 08826 Republic of Korea. Department of Materials Science and Engineering Seoul National University Seoul 08826 Republic of Korea.

Correction for 'Nucleic acid detection with single-base specificity integrating isothermal amplification and light-up aptamer probes' by Jaekyun Baek , , 2024, https://***/10.1039/D4NR01638F.

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Effect of substrate surface on GaN dot structure grown on Si(111) by droplet epitaxy

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physica status solidi c 2007年第7期4卷

作者： Hiroaki Otsubo Toshiyuki Kondo Yo Yamamoto Takahiro Maruyama Shigeya Naritsuka Department of Materials Science and Engineering Meijo University 1-501 Shiogamaguchi Tempaku Nagoya 468-8502 Japan Meijo University 21st CENTURY COE program “Nano Factory” 1-501 Shiogamaguchi Tempaku Nagoya 468-8502 Japan

The effect of substrate surface on GaN dot structure grown on Si(111) by droplet epitaxy using an rf plasma molecular beam epitaxy (MBE) system is reported. Compared with nitridated substrates, both enhancement of Ga migration and poorer wettability were observed on oxidized substrates, inducing enlargement of Ga droplets during nitridation. We demonstrated that the size and density of GaN dots grown by droplet epitaxy are strongly affected by pre-treatment of the substrate. In the fabrication of GaN dots by droplet epitaxy, the importance of optimizing nitridation conditions according to the substrate surface is demonstrated. (© 2007 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim)

关键词： 68.37.Ps 68.65.Hb 81.07.Bc 81.15Hi 81.65.Lp

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