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SSRN 2023年

作者： Kvaratskheliya, Askar Bianchini, Bruno Filimonov, Aleksandr Gomes, Leonardo Fernandes Macedo dos Santos, Rafael Formenton Gargarella, Piter Mädler, Lutz Okulov, Ilya Faculty ofProduction Engineering University ofBremen Badgasteiner Straße 2 28359Bremen Germany Leibniz Institute for Materials Engineering IWT Badgasteiner Straße 3 28359Bremen Germany Graduate Program in Materials Science andEngineering FederalUniversity ofSão Carlos Rod. Washington Luis km 235 SP São Carlos13565-905 Brazil Rod. Washington Luis Km 235 SP São Carlos13565-905 Brazil Rod. Washington Luis Km 235 SP São Carlos13565-905 Brazil MAPEX- Center for Materials andProcesses University ofBremen Bremen28359 Germany

Hierarchical nanoporous materials feature a unique set of physical, mechanical, and chemical properties which make them promising in various technological applications. This paper presents a novel approach to synthesise bulk (centimetre size) hierarchical Cu structures featuring three levels of porosity: (i) design of lattice structures for the mm-scale porosity by additive manufacturing;(ii) design of phase composition for the µm-scale porosity;(iii) and chemical dealloying for the nm-scale porosity. During the first step, a lattice structure composed of the Cu50Al50 wt. % precursor material was manufactured by laser powder bed fusion. The precursor consists of Cu2Al and Al phases. Second, the Al phase was etched from the Cu50Al50 precursor by corrosion in the NaOH solution. Third, the nanoporous Cu was formed by dealloying of the Cu2Al phase in the NaOH solution. The current approach paves the way for advancing the functionality of nanoporous materials via their multi-level hierarchical organization. © 2023, The Authors. All rights reserved.

关键词： Additives

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Innenrücktitelbild: Reversible Handedness Inversion and Circularly Polarized Light Reflection Tuning in Self-Organized Helical Superstructures Using Visible-Light-Driven Macrocyclic Chiral Switches (Angew. Chem. 8/2023)

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Angewandte Chemie 2023年第8期135卷

作者： Dr. Hao Wang Yuqi Tang Dr. Hari Krishna Bisoyi Prof. Quan Li Advanced Materials and Liquid Crystal Institute and Materials Science Graduate Program Kent State University Kent OH 44242 USA Institute of Advanced Materials and School of Chemistry and Chemical Engineering Southeast University Nanjing 211189 China

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PVA-based bioinks for 3D bioprinting: A comprehensive review of their applications in tissue engineering

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Bioprinting 2025年 49卷

作者： Narges Johari Zary Adabavazeh Francesco Baino Materials Engineering Group Golpayegan College of Engineering Isfahan University of Technology Golpayegan Iran Ph.D. Program Graduate Institute of Precision Manufacturing National Chin-Yi University of Technology Taichung Taiwan ROC Institute of Materials Physics and Engineering Department of Applied Science and Technology Politecnico di Torino Torino Italy

3D bioprinting is an innovative approach that overcomes the limitations of traditional methods for creating cell-laden biomaterials and constructs. It allows for the fabrication of complex and biologically active tissue structures. This review aims to provide a comprehensive evaluation of polyvinyl alcohol (PVA)-based bioinks within a 3D bioprinting framework. PVA-based bioinks exhibit remarkable properties, such as biocompatibility, biodegradability, and the ability to enhance cell growth and differentiation. These properties make them appropriate for many tissue engineering applications. The study evaluates the physicochemical and biological properties of PVA bioinks, including how they combine with other materials such as gelatin, chitin, chitosan, alginate, agarose, cellulose, κ-carrageenan, methacrylate, nanoparticles, mineral additives, carbon nanotubes, graphene oxide, and extracellular matrix components. Furthermore, this review evaluates the benefits of market availability and enhanced printing resolution, in addition to the challenges posed by complexity, dependency on support baths, and the risk of contamination. The objective of this review is to draw attention to the capabilities of PVA-based bioinks and provide guidelines for future research to improve the effectiveness of these materials in tissue engineering and regenerative medicine.

关键词： Bioprinting Bioink Polyvinyl alcohol PVA-based bioinks

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Maximum A-Posteriori Probability (MAP) Terahertz Parameter Extraction for Pancreatic Ductal Adenocarcinoma

Maximum A-Posteriori Probability (MAP) Terahertz Parameter E...

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International Conference on Infrared and Millimeter Waves

作者： Debamitra Chakraborty Bradley N. Mills Jing Cheng Scott A. Gerber Roman Sobolewski Materials Science Graduate Program University of Rochester Rochester New York USA Laboratory for Laser Energetics University of Rochester Rochester New York USA Department of Surgery University of Rochester Medical Center Rochester New York USA Department of Electrical and Computer Engineering University of Rochester Rochester New York USA

ISBN: (数字)9781728194271

ISBN: (纸本)9781728194288

We developed a maximum a-posteriori probability-based terahertz parameter extraction method to obtain tissue characteristics of paraffin-embedded murine pancreatic ductal adenocarcinoma samples. This estimation algorithm can produce conservative estimates of tissue parameters without resorting to frequency-domain analysis. We report well-resolved and statistically significant differences in tumor tissue regions as compared to their healthy counterparts using our parameters extraction algorithm. We propose to use the index of refraction and the absorption as imaging biomarker parameters for biological tissue characterization.

关键词： Maximum a posteriori estimation Absorption Frequency-domain analysis Biological tissues Refractive index Estimation Probability

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Emulating Complex Synapses Using Interlinked Proton Conductors

arXiv

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arXiv 2024年

作者： Zhang, Lifu Li, Ji-An Hu, Yang Jiang, Jie Lai, Rongjie Benna, Marcus K. Shi, Jian Department of Materials Science and Engineering Rensselaer Polytechnic Institute TroyNY12180 United States Neurosciences Graduate Program University of California San Diego La Jolla CA92093 United States Department of Mathematics Purdue University West LafayetteIN47907 United States Department of Neurobiology School of Biological Sciences University of California at San Diego La Jolla CA92093 United States Department of Physics Applied Physics and Astronomy Rensselaer Polytechnic Institute TroyNY12180 United States

In terms of energy efficiency and computational speed, neuromorphic electronics based on non-volatile memory devices is expected to be one of most promising hardware candidates for future artificial intelligence (AI). However, catastrophic forgetting, networks rapidly overwriting previously learned weights when learning new tasks, remains as a pivotal hurdle in either digital or analog AI chips for unleashing the true power of brain-like computing. To address catastrophic forgetting in the context of online memory storage, a complex synapse model (the Benna-Fusi model) has been proposed recently[1], whose synaptic weight and internal variables evolve following a diffusion dynamics. In this work, by designing a proton transistor with a series of charge-diffusion-controlled storage components, we have experimentally realized the Benna-Fusi artificial complex synapse. The memory consolidation from coupled storage components is revealed by both numerical simulations and experimental observations. Different memory timescales for the complex synapse are engineered by the diffusion length of charge carriers, the capacity and number of coupled storage components. The advantage of the demonstrated complex synapse in both memory capacity and memory consolidation is revealed by neural network simulations of face familiarity detection. Our experimental realization of the complex synapse suggests a promising approach to enhance memory capacity and to enable continual learning. Copyright © 2024, The Authors. All rights reserved.

关键词： Computational efficiency

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Outcoupling Hyperbolic Modes from Aligned Carbon Nanotube Films

Outcoupling Hyperbolic Modes from Aligned Carbon Nanotube Fi...

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CLEO: QELS_Fundamental science, QELS 2022

作者： Jerome, Bryant Prasad, Ciril S. Doumani, Jacques Dewey, Oliver S. Baydin, Andrey Pasquali, Matteo Kono, Junichiro Gao, Weilu Alabastri, Alessandro Naik, Gururaj V. Department of Electrical and Computer Engineering Rice University HoustonTX77005 United States Applied Physics Graduate Program Smalley-Curl Institute Rice University HoustonTX77005 United States Department of Chemical and Biomolecular Engineering Rice University HoustonTX77005 United States Smalley-Curl Institute Rice University HoustonTX77005 United States Department of Chemistry Rice University HoustonTX77005 United States Department of Materials Science and NanoEngineering Rice University HoustonTX77005 United States Department of Physics and Astronomy Rice University HoustonTX77005 United States Department of Electrical and Computer Engineering University of Utah Salt Lake CityUT84112 United States

Aligned carbon nanotube films make an excellent hyperbolic material platform in the infrared. Here, we experimentally demonstrate the presence of high-k modes in aligned carbon nanotube films and outcouple them to fre... 详细信息

ISBN: (纸本)9781557528209

关键词： Carbon films

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Stokesian Dynamics with odd viscosity

arXiv

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arXiv 2022年

作者： Yuan, Hang de la Cruz, Monica Olvera Applied Physics Graduate Program Northwestern University EvanstonIL60208 United States Department of Materials Science and Engineering Northwestern University EvanstonIL60208 United States Department of Chemistry Northwestern University EvanstonIL60208 United States Department of Physics and Astronomy Northwestern University EvanstonIL60208 United States

Stokesian Dynamics is a well-established computational method for simulating dynamics of many particles suspended in a conventional passive fluid medium. Active fluids composed of self-propelling particles with broken time reversal symmetry permit the emergence of a so-called odd viscosity. In this work, we extended the conventional Stokesian Dynamics formalism to incorporate the additional hydrodynamic effects due to odd viscosity, which enables simulating collective behaviors of many particles suspended in an active fluid medium with both even viscosity and odd viscosity. © 2022, CC BY.

关键词： Viscosity

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Effect of Temperature and Mischmetal Addition on the Microstructure, Mechanical Andcorrosion Behavior of Crn Hard Coatings Deposited Onto Zk60 Magnesium Alloys Using Hipims

SSRN

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SSRN 2023年

作者： Pereira da Silva, Erenilton Oliveira Junior, William Tavares Avila, Pedro Renato Lima Ribeiro, Josy Kelly Alves dos Santos, Marcos Junio Cortez Maciel, Natalia Mendes Rodrigues, Alisson Pinto, Haroldo Cavalcanti MG Janaúba39447-790 Brazil Department of Engineering Physics Polytechnique Montréal P.O. Box 6079 Station Centre-Ville MontréalQCH3C 3A7 Canada Graduate Program in Materials Science UnB Planaltina Faculty University of Brasilia DF Brasilia70904-910 Brazil SP São Carlos13566-590 Brazil

Magnesium alloys have recently gained popularity due to their low density and suitability for various applications requiring both lightweight and robust mechanical qualities. Nevertheless, their widespread utilization could be improved by their inadequate corrosion resistance. This study examines the deposition of ceramic films using chromium nitride (CrN) via High Power Impulse Magnetron Sputtering (HiPIMS) on ZK60 and ZK60 + 1.5 Mischmetal (MM) at 200°C and 300°C. The morphology and thickness of the CrN films was evaluated by Field Emission Gun-Scanning Electron Microscopy (FEG-SEM) and X-ray Diffraction (XRD), roughness by atomic force microscopy (AFM), and mechanical properties (hardness and elastic modulus) were measured by nanoindentation experiments. Furthermore, the electrochemical impedance spectroscopy (EIS) analysis was used to evaluate the corrosion resistance. Fractured cross-section SEM-FEG images of CrN coatings deposited at 200°C and 300°C revealed differences in thickness and morphology for all samples. ZK60 samples exhibited thicker coatings compared to ZK60+1.5MM, which can be attributed to the stability of intermetallic phases. Increasing temperature resulted in the formation of thinner coatings. Also, at 300°C samples presented different thickness. Surface roughness decreases with temperature, reflecting the formation of refined columnar structures. Hardness and elastic modulus increased with temperature, also presenting different behaviors at 300°C. Corrosion resistance also presented improvement at higher temperatures, with ZK60 outperforming ZK60+1.5MM, as EIS analysis confirmed the denser films enhance corrosion protection, while porous coatings exhibit lower resistance, as was observed for ZK60+1.5MM at 300°C. Results also showed the impact of the thermic stability of the samples on the coating formation, indicating that substrate temperature rises during deposition, leading to possible phase changes in the substrate and, consequently, affe

关键词： Corrosion resistance

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Direct insulator to relativistic quantum Hall transition in graphene

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Physical Review B 2023年第20期108卷 205304-205304页

作者： Ching-Chen Yeh Pin-Chi Liao Dinesh K. Patel Wei-Chen Lin Siang-Chi Wang Albert F. Rigosi Randolph E. Elmquist Chi-Te Liang Department of Physics National Taiwan University Taipei 106 Taiwan Physical Measurement Laboratory National Institute of Standards and Technology (NIST) Gaithersburg Maryland 20899 USA Physikalisch-Technische Bundesanstalt (PTB) Bundesallee 100 Braunschweig 38116 Germany Taiwan International Graduate Program Academia Sinica Taipei 115 Taiwan Department of Engineering and System Science National Tsing Hua University Hsinchu 300 Taiwan Center for Quantum Science and Engineering National Taiwan University Taipei 106 Taiwan Taiwan Consortium of Emergent Crystalline Materials (TCECM) Taipei 106 Taiwan

We present evidence of the direct insulator-quantum Hall transition in monolayer epitaxial graphene, a genuine two-dimensional (2D) system. We studied the transition from an insulating state to a quantum Hall state at a high Landau level filling factor ν=6>3 and the plateau-plateau transition from ν=6 to ν=2. Using scaling theory, the critical exponent κ was determined to be 0.41±0.02 for the direct insulator-quantum Hall transition. This closely aligns with κ=0.42±0.02 from the ν=6 to ν=2 quantum Hall plateau-plateau transition. These findings suggest that the two transitions may belong to the same universality class. While similar transitions have been explored in conventional two-dimensional charge systems, our study provides valuable insights into a truly 2D system, deepening our understanding of these transitions.

关键词： Electrical properties Fermions Landau levels Graphene Hall bar Resistivity measurements

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Multiple degrees-of-freedom programmable soft-matter-photonics: Configuration, manipulation, and advanced applications

Responsive Materials

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Responsive materials 2024年第1期2卷

作者： Yuxian Zhang Zhi-Gang Zheng Quan Li School of Physics East China University of Science and Technology Shanghai China Institute of Advanced Materials and School of Chemistry and Chemical Engineering Southeast University Nanjing China Materials Science Graduate Program Kent State University Kent Ohio USA Zhi-Gang Zheng and Quan Li.

For centuries, humans have never stopped exploring the nature of light and manipulating it, since light carries multiple information through its intrinsic wave-particle dualism, including wavelength, amplitude, phase, polarization, spin/orbital angular momentum, etc., which determines the physical language and basic manners we perceive the objective world. Conventional optical devices, such as lenses, prisms, and lasers, are composed of solid elements that are bulky, making it difficult to manipulate light dynamically with multiple degrees-of-freedom. Comparatively, some responsive soft matters, especially represented by liquid crystals (LCs), possess distinctive orientational order and spontaneous self-assembled superstructures, enabling the digital programming of microstructures and multiple degrees-of-freedom manipulation of their optical characteristics. The optical manipulation based on these soft superstructures, that is, the “soft-matter-photonics”, is playing an impressive role in integrated functional devices, especially in the present age of information explosion. Herein, we review the latest advances, respectively, in the microstructure configurations, multiple degrees-of-freedom manipulations, and the relevant prospective applications. Additionally, scientific issues and technical challenges that hinder the programing operation and optical manipulations are discussed. Toward a four-dimensional optical manipulation of soft condensed matter, this review may have wide implications on a variety of applications, including the integrated fabrication of compact elements, multi-channel information processing and high-capacity optical communications.

关键词： degree-of-freedom liquid crystal optical manipulation planar optics soft matter

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