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Evaluation of Solubilization Time in Uncontrolled Atmosphere on Grain Growth, Phase Transformation Temperatures, and Mechanical Properties in a CuAlBe SMA

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Metallurgical and materials Transactions A: Physical Metallurgy and materials science 2025年

作者： da Silva Franco, Luiz Henrique Caluête, Rafael Evaristo de Lima, Bruno Alessandro Silva Guedes de Oliveira, Danniel Ferreira Brito, Ieverton Caiandre Andrade Department of Materials Engineering Federal University of Paraíba PB João Pessoa58051-900 Brazil Department of Mechanical Engineering Federal University of Paraíba PB João Pessoa58051-900 Brazil Graduate Program in Materials Science and Engineering Federal University of Paraíba PB João Pessoa58051-900 Brazil

Thermomechanical properties of SMAs are strongly affected by the metallurgical conditions imposed during their production. In this work, experiments were performed to investigate the behavior of the Cu–11.8Al–0.50Be (wt pct) SMA during solubilization at different times under an uncontrolled atmosphere. The results presented serve as a basis for predicting the macrostructure and thermomechanical properties in practical applications using CuAlBe SMAs. The grain growth evaluated by OM proved to be extremely sensitive to treatment time even after short intervals, tending to stabilize after 12 hours. Chemical analysis by EDS indicated a small variation in Al content produced during solidification, with 3 hours being enough to homogenize the Al concentration throughout the ingot despite producing a microstructure with non-uniform grain size. This variation in Al is not significant enough to influence the phase transformation temperatures, with the changes attributed to the grain growth and loss of Be by oxidation. ¼ hour resulted in the lowest values for maximum stress/strain, while 24 hours of solubilization showed the highest values of strain with small dispersion. The mixed fracture type (brittle/ductile) observed by SEM in the ¼ hour samples supports the hypothesis that ¼ hour is insufficient to dissolve the phases formed during solidification. This effect is aggravated by the strong elastic anisotropy, which contributes to embrittlement during quenching. © The Minerals, Metals & materials Society and ASM International 2025.

关键词： Setting

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Assessment of scoring functions for computational models of protein-protein interfaces

arXiv

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arXiv 2024年

作者： Sumner, Jacob Meng, Grace Brandt, Naomi Grigas, Alex T. Córdoba, Andrés Shattuck, Mark D. O’Hern, Corey S. Graduate Program in Computational Biology and Bioinformatics Yale University New HavenCT06520 United States Integrated Graduate Program in Physical and Engineering Biology Yale University New HavenCT06520 United States Department of Chemistry Yale University New HavenCT06520 United States Department of Physics Yale University New HavenCT06520 United States Department of Chemistry Duke University DurhamNC27708 United States Department of Physics Duke University DurhamNC27708 United States Benjamin Levich Institute Physics Department City College of New York New YorkNY10031 United States Department of Mechanical Engineering and Materials Science Yale University New HavenCT06520 United States Department of Applied Physics Yale University New HavenCT06520 United States

A goal of computational studies of protein-protein interfaces (PPIs) is to predict the binding site between two monomers that form a heterodimer. The simplest version of this problem is to rigidly re-dock the bound forms of the monomers, which involves generating computational models of the heterodimer and then scoring them to determine the most native-like models. Scoring functions have been assessed previously using rank- and classification-based metrics, however, these methods are sensitive to the number and quality of models in the scoring function training set. We assess the accuracy of seven PPI scoring functions by comparing their scores to a measure of structural similarity to the x-ray crystal structure (i.e. the DockQ score) for a non-redundant set of heterodimers from the Protein Data Bank. For each heterodimer, we generate re-docked models uniformly sampled over DockQ and calculate the Spearman correlation between the PPI scores and DockQ. For some targets, the scores and DockQ are highly correlated;however, for many targets, there are weak correlations. Several physical features can explain the difference between difficult- and easy-to-score targets. For example, strong correlations exist between the score and DockQ for targets with highly intertwined monomers and many interface contacts. We also develop a new score based on only three physical features that matches or exceeds the performance of current PPI scoring functions. These results emphasize that PPI prediction can be improved by focusing on correlations between the PPI score and DockQ and incorporating more discriminating physical features into PPI scoring functions. © 2024, CC BY.

关键词： Monomers

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A temperature or FUV tracer? The HNC/HCN ratio in M83 on the GMC scale

arXiv

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arXiv 2024年

作者： Harada, Nanase Saito, Toshiki Nishimura, Yuri Watanabe, Yoshimasa Sakamoto, Kazushi National Astronomical Observatory of Japan 2-21-1 Osawa Mitaka Tokyo181-8588 Japan Astronomical Science Program Graduate Institute for Advanced Studies SOKENDAI 2-21-1 Osawa Mitaka Tokyo181-1855 Japan Department of Astronomy The University of Tokyo 7-3-1 Hongo Bunkyo-ku Tokyo113-0033 Japan Materials Science and Engineering College of Engineering Shibaura Institute of Technology 3-7-5 Toyosu Koto-ku Tokyo135-8548 Japan Institute of Astronomy and Astrophysics Academia Sinica 11F of AS/NTU Astronomy-Mathematics Building No.1 Sec. 4 Roosevelt Rd Taipei10617 Taiwan

The HNC/HCN ratio is observationally known as a thermometer in Galactic interstellar molecular clouds. A recent study has alternatively suggested that the HNC/HCN ratio is affected by the ultraviolet (UV) field, not by the temperature. We aim to study this ratio on the scale of giant molecular clouds in the barred spiral galaxy M83 towards the southwestern bar end and the central region from ALMA observations, and if possible, distinguish the above scenarios. We compare the high (40-50 pc) resolution HNC/HCN ratios with the star formation rate from the 3-mm continuum intensity and the molecular mass inferred from the HCN intensities. Our results show that the HNC/HCN ratios do not vary with the star formation rates, star formation efficiencies, or column densities in the bar-end region. In the central region, the HNC/HCN ratios become higher with higher star formation rates, which tend to cause higher temperatures. This result is not consistent with the previously proposed scenario in which the HNC/HCN ratio decreases with increasing temperature. Spectral shapes suggest that this trend may be due to optically thick HCN and optically thin HNC. In addition, we compare the large-scale (∼ 200 pc) correlation between the dust temperature from the FIR ratio and the HNC/HCN ratio for the southwestern bar-end region. The HNC/HCN ratio is lower when the dust temperatures are higher. We suggest from the above results that the HNC/HCN ratio depends on the UV radiation field that affects the interstellar medium on the ∼ 100 pc scale where the column densities are low. © 2024, CC BY.

关键词： Dust

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Landau Polaritons in a Full-Dielectric Three-Dimensional Photonic-Crystal Cavity

Landau Polaritons in a Full-Dielectric Three-Dimensional Pho...

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CLEO: science and Innovations, S and I 2022

作者： Tay, Fuyang Mojibpour, Ali Liang, Shuang Baydin, Andrey Ahmadivand, Arash Peraca, Nicolas Marquez Xu, Hongjing Gardner, Geoff C. Manfra, Michael J. Hagenmüller, David Kono, Junichiro 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 Physics and Astronomy Purdue University West LafayetteIN47907 United States Birck Nanotechnology Center Purdue University West LafayetteIN47907 United States Smalley-Curl Institute Rice University HoustonTX77005 United States Department of Physics and Astronomy Rice University HoustonTX77005 United States Microsoft Quantum Purdue Purdue University West LafayetteIN47907 United States School of Electrical and Computer Engineering Purdue University West LafayetteIN47907 United States School of Materials Engineering Purdue University West LafayetteIN47907 United States Université de Strasbourg CNRS Strasbourg67000 France Department of Materials Science and NanoEngineering Rice University HoustonTX77005 United States

ISBN: (纸本)9781557528209

We fabricated a full-dielectric three-dimensional photonic-crystal cavity containing an ultrahigh-mobility two-dimensional electron gas. By applying a strong perpendicular magnetic field, we created Landau polaritons originating from the ultrastrong coupling of electrons with cavity modes. © Optica Publishing Group 2022, © 2022 The Author(s)

关键词： Polariton

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Reducing system dimensionality with long-range collective dipole-dipole interactions

arXiv

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arXiv 2023年

作者： Boddeti, Ashwin K. Wang, Yi Juarez, Xitlali G. Boltasseva, Alexandra Odom, Teri W. Shalaev, Vladimir Alaeian, Hadiseh Jacob, Zubin Elmore Family School of Electrical and Computer Engineering Purdue University West LafayetteIN47907 United States Birck Nanotechnology Center Purdue University West LafayetteIN47907 United States Graduate Program in Applied Physics Northwestern University EvanstonIL60208 United States Department of Materials Science and Engineering Northwestern University EvanstonIL60208 United States Department of Chemistry Northwestern University EvanstonIL60208 United States School of Physics and Astronomy Purdue University West LafayetteIN47907 United States

Dimensionality plays a crucial role in long-range dipole-dipole interactions (DDIs). We demonstrate that a resonant nanophotonic structure modifies the apparent dimensionality in an interacting ensemble of emitters, as revealed by population decay dynamics. Our measurements on a dense ensemble of interacting quantum emitters in a resonant nanophotonic structure with long-range DDIs reveal an effective dimensionality reduction to d¯ = 2.20(12), despite the emitters being distributed in 3D. This contrasts the homogeneous environment, where the apparent dimension is d¯ = 3.00. Our work presents a promising avenue to manipulate dimensionality in an ensemble of interacting emitters. © 2023, CC0.

关键词： Dipole moment

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In situ Light-Writable Orientation Control in Liquid Crystal Elastomer Film Enabled by Chalcones

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Angewandte Chemie 2024年第11期136卷

作者： Yiyi Xu Xinfang Zhang Zhenpeng Song Xiao Chen Yinliang Huang Jinyu Wang Prof. Bingxiang Li Prof. Shuai Huang Prof. Quan Li Institute of Advanced Materials and School of Chemistry and Chemical Engineering Southeast University Nanjing 211189 China Materials Science Graduate Program Kent State University Kent OH-44242 USA College of Electronic and Optical Engineering & College of Flexible Electronics (Future Technology) Nanjing University of Posts and Telecommunications Nanjing 210023 China

Liquid crystal elastomers (LCEs) are stimulus-responsive materials with intrinsic anisotropy. However, it is still challenging to in situ program the mesogen alignment to realize three-dimensional (3D) deformations with high-resolution patterned structures. This work presents a feasible strategy to program the anisotropy of LCEs by using chalcone mesogens that can undergo a photoinduced cycloaddition reaction under linear polarized light. It is shown that by controlling the polarization director and the irradiation region, patterned alignment distribution in a freestanding LCE film can be created, which leads to complex and reversible 3D shape-morphing behaviors. The work demonstrates an in situ light-writing method to achieve sophisticated topography changes in LCEs, which has potential applications in encryption, sensors, and beyond.

关键词： Chalcone-Based Liquid Crystal Liquid Crystal Elastomer Photo-Crosslinked Material Polarized Light Alignment

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A biomimetic micropillar wound dressing with flavone and polyphenol control release in vitro and in vivo

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Journal of the Taiwan Institute of Chemical Engineers 2024年 160卷

作者： Cheng, Tien-Hsin Lin, Ruei-Hong Cheng, Yu-Shen Shih, Pin-Keng Show, Pau Loke Chen, Hsiao-Yi Nakmee, Pattarawadee Sumthong Chang, Jui-Jen Huang, Dong-Ming Wang, Hui-Min David Department of Chemical and Materials Engineering National Yunlin University of Science and Technology Yunlin Taiwan Graduate Institute of Biomedical Engineering National Chung Hsing University Xingda Rd. South Dist. Taichung402 China Department of Neurological Institute Taichung Veterans General Hospital Taichung China Doctoral Program in Tissue Engineering and Regenerative Medicine National Chung Hsing University Taichung China Department of Surgery China Medical University Hospital Taichung Taiwan School of Medicine China Medical University Taichung Taiwan Department of Chemical Engineering Khalifa University Abu Dhabi United Arab Emirates Faculty of Science at Sriracha Kasetsart University Sriracha Campus 199 Moo 6 Sukhumvit Rd. Chonburi Sriracha20230 Thailand Department of Medical Research China Medical University Hospital China Medical University Taichung China Institute of Biomedical Engineering and Nanomedicine National Health Research Institutes Miaoli County China Regenerative Medicine and Cell Therapy Research Center Graduate Institute of Medicine College of Medicine Kaohsiung Medical University Kaohsiung Taiwan Department of Medical Laboratory Science and Biotechnology China Medical University Taichung China

Background: Wound healing is a complex and dynamic process involving the replacement of devitalized and missing cellular structures and tissue layers. Methods: This study involved developing a drug-loaded biomimetic micropillar wound dressing based upon inspiration from witnessing the adhesive ability in a gecko's footpad. The conformal adhesion was set up by applying a soft elastomer thin film on the developed wound dressing surfaces. The results showed that the developed surfaces prepared based on polydimethylsiloxane (PDMS) had low surface free energy, high chemical stability, and good plasticity. Astaxanthin (AST) and curcumin were applied as the patch's bioactive compounds to help accelerate the wound healing process. Results: The results showed that the developed surfaces prepared based on polydimethylsiloxane (PDMS) had low surface free energy, high chemical stability, and good plasticity. Astaxanthin (AST) and curcumin were applied as the patch's bioactive compounds to help accelerate the wound healing process. The results indicate that the developed biomimetic micropillar patches could release the loaded drugs and significantly increase cell viability and collagen content to 20 % ∼ 25 % in vitro and in vivo. Conclusion: In summation, the primary purpose of this study has been to design a novel encapsulated carrier (micropillar patch) for use in adjustable drug release, while combining with the biomimetic microstructure to reach wound healing through percutaneous absorption. © 2024 Taiwan Institute of Chemical Engineers

关键词： Chemical stability

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Influence of Mwcnt Aspect Ratio on the Rheological, Electrical, Electromagnetic Shielding, and Mechanical Properties of Pc Melt Mixed Nanocomposites

SSRN

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SSRN 2022年

作者： dos Anjos, Erick Gabriel Ribeiro Brazil, Tayra Rodrigues de Melo Morgado, Guilherme Ferreira Montagna, Larissa Stieven Braga, Natália Ferreira Antonelli, Eduardo Marini, Juliano Baldan, Maurício Ribeiro Rezende, Mirabel Cerqueira Passador, Fabio Roberto 330 Talim St. SP São José dos Campos12231-280 Brazil Graduate Program in Materials Science and Engineering Rodovia Washington Luís Km 235 SP São Carlos13565-905 Brazil Department of Materials Engineering Rodovia Washington Luís Km 235 SP São Carlos13565-905 Brazil 1758 Astronautas Av. SP São José dos Campos12227-010 Brazil

Multi-wall carbon nanotubes (MWCNTs) have received particular attention for preparing multifunctional polymer nanocomposites with engineering polymer matrixes, such as polycarbonate (PC). This effort seeks to unite electrical, mechanical, and electromagnetic interference shielding effectiveness (EMI SE) properties in one unique material. Different commercial grades of MWCNTs have recently been available, so understanding how they affect the nanocomposite performance is indispensable. Thus, in this work, two MWCNTs with different aspect ratios (S-MWCNT with aspect ratio of 158 and L-MWCNT with aspect ratio of 600) were evaluated as nanofillers to improve the electrical, electromagnetic, and mechanical properties of PC melt mixed nanocomposites prepared by extrusion. PC/MWCNT nanocomposites with different contents of both MWCNTs were prepared (0.5, 1.0, 1.5, 2.0 and 2.5 wt%) and characterized by scanning electron microscopy, oscillatory rheological, impedance spectroscopy, electromagnetic interference shielding effectiveness (EMI SE), and mechanical tests. The S-MWCNT, with lower length and diameter than the L-MWCNT, propitiated a better dispersion in the PC matrix resulting in better electrical and EMI SE properties. The rheological analyses reaffirmed easier dispersion behavior, with an evident change for the solid-like behavior (G'>G") in low contents of S-MWCNT. The content of 2.0 wt% has been established as an optimum for both MWCNTs, considering the AC electrical conductivity (> 10 -4 S/cm) and higher EMI SE (14 dB for S-MWCNT and 11 dB for L-MWCNT) for this content. © 2022, The Authors. All rights reserved.

关键词： Polycarbonates

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Inside Cover: A Photo- and Thermo-Driven Azoarene-Based Circularly Polarized Luminescence Molecular Switch in a Liquid Crystal Host (Angew. Chem. Int. Ed. 48/2023)

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Angewandte Chemie International Edition 2023年第48期62卷

作者： Wenxin Kang Yuqi Tang Xianyu Meng Siyang Lin Xinfang Zhang Prof. Jinbao Guo Prof. Quan Li Key Laboratory of Carbon Fibers and Functional Polymers Ministry of Education and College of Materials Science and Engineering Beijing University of Chemical Technology Beijing 100029 China Institute of Advanced Materials and School of Chemistry and Chemical Engineering Southeast University Nanjing 211189 China Materials Science Graduate Program Kent State University Kent OH 44242 USA

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Innentitelbild: A Photo- and Thermo-Driven Azoarene-Based Circularly Polarized Luminescence Molecular Switch in a Liquid Crystal Host (Angew. Chem. 48/2023)

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Angewandte Chemie 2023年第48期135卷

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