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3D printed bioabsorbable composite scaffolds of poly (lactic acid)-tricalcium phosphate-ceria with osteogenic property for bone regeneration

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Biomaterials and Biosystems 2024年 13卷 100086页

作者： Harb, Samarah V. Kolanthai, Elayaraja Pugazhendhi, Abinaya S. Beatrice, Cesar A.G. Pinto, Leonardo A. Neal, Craig J. Backes, Eduardo H. Nunes, Ana C.C. Selistre-de-Araújo, Heloisa S. Costa, Lidiane C. Coathup, Melanie J. Seal, Sudipta Pessan, Luiz A. Department of Materials Engineering (DEMa) Federal University of Sao Carlos (UFSCar) SP São Carlos Brazil Advanced Materials Processing and Analysis Center Department of Materials Science and Engineering University of Central Florida Orlando FL United States Biionix Cluster College of Medicine University of Central Florida Orlando FL United States Graduate Program in Materials Science and Engineering Department of Materials Engineering (DEMa) Federal University of São Carlos (UFSCar) SP São Carlos Brazil Department of Physiological Sciences Federal University of São Carlos (UFSCar) SP São Carlos Brazil

The fabrication of customized implants by additive manufacturing has allowed continued development of the personalized medicine field. Herein, a 3D-printed bioabsorbable poly (lactic acid) (PLA)- β-tricalcium phosphate (TCP) (10 wt %) composite has been modified with CeO₂ nanoparticles (CeNPs) (1, 5 and 10 wt %) for bone repair. The filaments were prepared by melt extrusion and used to print porous scaffolds. The nanocomposite scaffolds possessed precise structure with fine print resolution, a homogenous distribution of TCP and CeNP components, and mechanical properties appropriate for bone tissue engineering applications. Cell proliferation assays using osteoblast cultures confirmed the cytocompatibility of the composites. In addition, the presence of CeNPs enhanced the proliferation and differentiation of mesenchymal stem cells;thereby, increasing alkaline phosphatase (ALP) activity, calcium deposition and bone-related gene expression. Results from this study have shown that the 3D printed PLA-TCP-10%CeO₂ composite scaffold could be used as an alternative polymeric implant for bone tissue engineering applications: avoiding additional/revision surgeries and accelerating the regenerative process. © 2023

关键词： Additive manufacturing Biomaterial Bone tissue engineering Ceria nanoparticle Polymer-matrix composites

Scalable Production of Photovoltaic-Grade WSe2 via Tungsten Selenization

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Scalable Production of Photovoltaic-Grade WSe2 via Tungsten ...

IEEE Conference Photovoltaic Specialists (PVSC)

作者： Kathryn M. Neilson Sarallah Hamtaei Koosha Nassiri Nazif Joshua M. Carr Sepideh Rahimi Frederick Nitta Guy Brammertz Jeffery L. Blackburn Joke Hadermann Krishna C. Saraswat Obadiah G. Reid Bart Vermang Alwin Daus Eric Pop Dept. of Electrical Engineering Stanford Univ. Stanford CA United States Hasselt Univ. imo-imomec Hasselt Belgium Imec imo-imomec Genk Belgium EnergyVille imo-imomec Genk Belgium Materials Science & Engineering Program Univ. Colorado Boulder Boulder CO United States Univ. Antwerp Electron Microscopy for Materials Science (EMAT) Antwerp Belgium Dept. of Materials Science & Engineering Stanford Univ. Stanford CA United States University of Colorado Boulder Renewable and Sustainable Energy Institute Golden CO United States

ISBN: (数字)9781665464260

ISBN: (纸本)9781665475822

Transition metal dichalcogenides (TMDs) hold significant promise for photovoltaic applications with high specific power thanks to their high absorption coefficients enabling ultrathin form factor., desirable band gaps for solar energy harvesting, and dangling-bond-free surfaces. Nevertheless, their small-scale synthesis methods have limited their practicality for commercial use. Here, we address this shortcoming and report an industrial, wafer-scale, and rapid selenization method to synthesize thickness-tunable TMD films (i.e., WSe2) from (pre-patterned) sputtered tungsten layers, using solid source selenium or H2Se precursors. These absorbers are shown to have a smooth surface, with a layered van der Waals structure, and charge carrier lifetimes up to 144 ns, over 14x higher than large-area TMD films previously demonstrated. Such high carrier lifetimes correspond to a power conversion efficiency of nearly 22% and a specific power of nearly 64 W/g in a packaged solar cell or almost 3 W/g in a fully packaged module.

关键词： Photovoltaic systems Films Tungsten Solar energy Production Solids Selenium Transition metal dichalcogenides Power conversion Charge carrier lifetime

Exploring the Potential of Tesla Valve for Filtering and Sorting Microscale Active Swimmers: A Computational Study

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SSRN 2023年

作者： Rogers, Ariel He, Zhiyao Wang, Yong Department of Physics University of Arkansas FayettevilleAR72701 United States Department of Computer Science and Computer Engineering University of Arkansas FayettevilleAR72701 United States Materials Science & Engineering Program University of Arkansas FayettevilleAR72701 United States Cell & Molecular Biology Program University of Arkansas FayettevilleAR72701 United States

An interesting connection between shark spiral intestines and the Tesla valve was proposed recently;however, how Tesla valves interact with active matters and the potential applications of Tesla valves in biology remain largely unexplored. Here, we present a computational study on the potential use of Tesla valves for filtering and sorting microscale active swimmers such as bacteria. We investigated the behavior of microswimmers passing through the Tesla valve at different linear and angular velocities using numerical simulations, and quantified the diodicity of the Tesla valve for active swimmers. Our results demonstrate that the Tesla valve can effectively filter and sort microscale swimmers based on their swimming behavior. The findings of this study suggest that Tesla valves could have potential applications in microscale sorting and chromatography, with significant implications for biomedical and environmental engineering. © 2023, The Authors. All rights reserved.

关键词： Bacteria

In-situ Atomic-scale Observations of Disconnection Dynamics at the Metal/Oxide Interfaces

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Microscopy and Microanalysis 2022年第S1期28卷 150-151页

作者： Liang, Zhilu Wang, Jianyu Sun, Xianhu Chen, Xiaobo Zakharov, Dmitri N Zhou, Guangwen Department of Mechanical Engineering & Materials Science and Engineering Program State University of New York at Binghamton Binghamton NY USA Center for Functional Nanomaterials Brookhaven National Laboratory Upton NY USA

Uncertainty Quantification and Propagation for Multiscale materials Systems with Agglomeration and Structural Anomalies

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SSRN 2024年

作者： Comlek, Yigitcan Mojumder, Satyajit van Beek, Anton Prabhune, Prajakta Ciampaglia, Alberto Apley, Daniel W. Brinson, L. Catherine Liu, Wing Kam Chen, Wei Department of Mechanical Engineering Northwestern University Evanston United States Theoretical and Applied Mechanics Program Northwestern University Evanston United States School of Mechanical and Materials Engineering University College Dublin Dublin Ireland Thomas Lord Department of Mechanical Engineering and Materials Science Duke University Durham United States Department of Mechanical and Aerospace Engineering Politecnico di Torino Turin Italy Department of Industrial Engineering and Management Sciences Northwestern University Evanston United States

Advancements in manufacturing technologies have enabled material system design optimization at multiple length scales. However, the microstructural anomalies and uncertainties present at each scale have not been considered comprehensively enough for systems to be robust to manufacturing variations. Consequently, considering anomalies at various length scales of the material’s structure and understanding their effects on a part’s response are crucial for designing engineered parts that are robust to various sources of uncertainty. In this work, an efficient bottom-up hierarchical uncertainty quantification and propagation framework bridging multiple scales to establish a design allowable range for the material system at the part-scale is presented. We demonstrate our framework on an additively manufactured polymer nanocomposite material system that is subject to anomalies at different length scales that impact the material properties. Specifically, agglomeration defects formed due to attractive forces between nanoparticles at the microscale and structural variabilities caused by the voids resulting from different processing conditions at the mesoscale are considered. The introduced hierarchical sampling framework combines (i) an innovative microstructure image characterization and reconstruction, (ii) a mechanistic reduced-order model that enables fast property predictions for high-dimensional microstructural design spaces, and (iii) efficient uncertainty quantification and propagation through Copula-based sampling across multiple length scales to reduce the sampling budget by 95%. Through validation of our method, we demonstrate the importance of considering the effects of process-induced microstructure features on the performance of a part. © 2024, The Authors. All rights reserved.

关键词： Microstructure

Optical and Mechanical Properties of Rutile TiO2 Subjected to AC Flash Processing

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SSRN 2024年

作者： Masuda, Hiroshi Tokunaga, Tomoharu Yamamoto, Takahisa Yoshida, Hidehiro Department of Materials Science and Engineering School of Engineering The University of Tokyo 7-3-1 Hongo Bunkyo-ku Tokyo113-8656 Japan Department of Materials Design Innovation Engineering School of Engineering Nagoya University Furo-cho Chikusa-ku Nagoya464-8603 Japan Next Generation Zirconia Social Cooperation Program Institute of Engineering Innovation The University of Tokyo 2-11-16 Yayoi Bunkyo-ku Tokyo113-8656 Japan

Unusual physical properties associated with lattice defects induced by flash sintering and processing of oxide ceramics have attracted attentions. In this study, optical and mechanical properties of undoped and polycrystalline rutile TiO2 subjected to alternating current (AC) flash processing were characterized through diffuse reflectance spectroscopy and nanoindentation experiments at room temperature. The flashed sample exhibited substantial optical blackening and elastic softening but negligible changes in the hardness and crystal structure. The elastic softening demonstrated a significant rate dependence (i.e., elastic moduli decreased with testing rate) indicating anelasticity, which was possibly caused by stress-induced reordering of point defect dipoles induced by AC flash processing. This anelasticity suggests that pronounced ionic mobility is obtained by flash processing even in undoped systems, which can potentially be extended to a general understanding of mass transport phenomena in transient metal oxides in strong electric fields. © 2024, The Authors. All rights reserved.

关键词： Nanoindentation

Microarchitectural Design Variation of the Echinoid Skeleton: A 3D Structural and Mechanical Study of Paracentrotud lividusi

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SSRN 2024年

作者： Perricone, Valentina Cesarano, Pasquale Deb, Mainak Lublin, Derek Mutalipassi, Mirko Pappalardo, Lucia Kisailus, David Marmo, Francesco Department of Materials Science and Engineering University of California Irvine United States Department of Structures for Engineering and Architecture University of Naples Federico II Italy Materials and Manufacturing Technology Program University of California Irvine United States Department of Integrative Marine Ecology Stazione Zoologica Anton Dohrn Villa Comunale Napoli Italy Palermo Italy Italy Wipro Technologies

Biological materials usually show remarkable mechanical properties, despite being composed of fragile and simple components (i.e., strong but brittle minerals and tough but weak proteins). These properties are conferred through a multiscale design, in which shapes, structures and composition are coherently organized leading to unique emerging strategies. Noteworthy is the case of the sea urchin skeleton, a hierarchical tasseled structure composed of multiple calcitic plates that are both lightweight and load-bearing. At the microscale, each plate shows a unique species-specific pattern consisting of a porous 3D lattice-like meshwork of trabeculae, called stereom. Interestingly, the stereom architecture is extremely complex and variable in different basic types, each one characterized by a unique topology and structural behaviors. In this context, the present study provides an in-depth analysis of the microarchitectural variability in the sea urchin Paracentrotus lividus. Accordingly, micro-CT scans, image analysis, 3D modeling, and linear elastic FE-Analysis were conducted to provide new insights about the topological and geometrical variability of the different stereom types, and their region-specific mechanical behavior calculated for tensile and shear loading. These results are of value to ameliorate the understanding of the mechanical function of the stereom variability, as well as to identify adaptive solutions useful for future biomimetic transfer applications. © 2024, The Authors. All rights reserved.

关键词： Finite element method

Corrigendum to “Time-course concentration of ethanol, acetaldehyde and acetate in rat brain dialysate following alcohol self-administration” [Alcohol 123 (2025) 69–76]

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Alcohol 2025年 125卷 53-54页

作者： Tse-Ang Lee Hongjoo J. Lee Regina A. Mangieri Rueben Gonzales Heba Ajmal Tanya Hutter Department of Mechanical Engineering The University of Texas at Austin Austin TX 78712 USA Department of Psychology The University of Texas at Austin Austin TX 78712 USA College of Pharmacy Division of Pharmacology and Toxicology The University of Texas at Austin Austin TX 78712 USA Department of Neuroscience The University of Texas at Austin Austin TX 78712 USA Materials Science and Engineering Program and Texas Materials Institute The University of Texas at Austin Austin TX 78712 USA

Evolution of electronic and magnetic properties in the topological semimetal SmSbxTe2−x

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Physical Review B 2022年第15期105卷 155139-155139页

作者： Krishna Pandey Rabindra Basnet Jian Wang Bo Da Jin Hu Materials Science and Engineering Program Institute for Nanoscience and Engineering University of Arkansas Fayetteville Arkansas 72701 USA Department of Physics University of Arkansas Fayetteville Arkansas 72701 USA Department of Chemistry and Biochemistry Wichita State University Wichita Kansas 67260 USA Research and Services Division of Materials Data and Integrated System National Institute for Materials Science 1-1 Namiki Tsukuba Ibaraki 305-0044 Japan

The ZrSiS-type materials have attracted intensive attention due to the existence of various topological fermions. The magnetic version of the ZrSiS-type materials, LnSbTe (Ln=lanthanides), is an ideal candidate to explore novel exotic states due to the interaction between magnetism and topology. In this work, we report the experimental study on structural, magnetic, thermodynamic, and electronic properties for SmSbxTe2−x with various Sb content. The revealed evolutions of these properties with tuning the compositions would provide useful insights for the fundamental topological physics and the future applications.

关键词： Magnetic order Topological materials Topological phases of matter Antiferromagnets Single crystal materials Strongly correlated systems Crystal growth Crystal structures Energy-dispersive x-ray spectroscopy Magnetization measurements Specific heat measurements X-ray diffraction