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Catharanthus roseus-mediated CuAl2O4 nanocomposites for evaluation of killing kinetics

Chemosphere 2024年 359卷 142369页

作者： Potbhare, Ajay K. Yerpude, Sachin Daddemal-Chaudhary, Ankita R. Lambat, Ashish mondal, Aniruddha Dadure, Kanhaiya m. Rai, Alok R. Abdala, Ahmed Chaudhary, Ratiram G. Department of Chemistry S. K. Porwal College of Arts and Science and Commerce Kamptee441001 India Department of Microbiology S. K. Porwal College of Arts and Science and Commerce Kamptee441001 India Lady Amritabai Daga College for Women of Arts Commerce and Science Nagpur440010 India Post Graduate Teaching Department of Botany RTM Nagpur University Nagpur440033 India Department of Biology Sevadal Mahila Mahavidyalaya Nagpur India Division of Materials Science Lulea University of Technology Lulea97187 Sweden Department of Chemistry Bajaj College of Science Wardha India Chemical Engineering Program Texas A&M University at Qatar Doha Qatar

The present article portrayed on the killing kinetic of human pathogenic bacteria using bioinspired mesoporous CuAl2O4 nanocomposites (NCs). The NCs was fabricated using leaf extract of medicinal plant Catharanthus roseus (CR) as a green reducer and stabilizer. As bio-fabricated material was calcined at 800 °C and characterized by several analytical techniques like X-ray Diffraction (XRD), Fourier Transform Infrared Spectroscopy (FT-IR), Ultraviolet–Visible Diffuse Reflectance Spectroscopy (UV-DRS), Energy Dispersive X-Ray Spectroscopy (EDS), X-Ray Photoelectron Spectroscopy (XPS), Raman, Brunauer-Emmett-Teller (BET), Scanning Electron microscopy (SEm), and Transmission Electron microscopy (TEm) to authenticate its structure, phase, chemical bonding, chemical state, size and morphology behaviors. XRD and TEm revealed a reduced crystallite and nanoscale sizes of biosynthesized NCs. moreover, XRD study exposed a cubic-structure of material, while transmission electron microscopy rendered an average particles size in range 10–15 nm. However, BET profile advocates a mesoporous nature of the particles. An effective biological molecular docking modulation assessed by substituting natural inhibitor by bioinspired NCs, while the protein PDB ID 4Z8D FabH as a receptor site for the present investigation. After assessment of molecular docking examination, the antibacterial activity of bioinspired NCs were performed against Staphylococcus aureus, Bacillus subtillis, Klebsiella pneumoniae and Escherichia coli using agar-well method. The broth culture method was employed on different pathogenic strains by kinetic growth assays and colony forming unit. © 2024 Elsevier Ltd

关键词： Nanocomposites

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mid-infrared waveguides for volatile organic compounds detection

Mid-infrared waveguides for volatile organic compounds detec...

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Optics and Photonics for Sensing the Environment, ES 2019 - Part of Optical Sensors and Sensing Congress

作者： Jin, Tiening Zhou, Junchao Lin, Pao Tai Department of Electrical and Computer Engineering Texas A&M University College StationTX77843 United States Department of Materials Science and Engineering Texas A&M University College StationTX77843 United States Center for Remote Health Technologies and Systems Texas A&M University College StationTX77843 United States

miniaturized mid-Infrared (mid-IR) photonic sensors were utilized for volatile organic compounds (VOCs) detection. The optical waveguides were fabricated by microelectronic processes. © OSA 2019 © 2019 The A... 详细信息

ISBN: (纸本)9781943580613

关键词： Volatile organic compounds

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The influence of nano filter elements on pressure drop and pollutant elimination efficiency in town border stations (vol 13, 18793, 2023)

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SCIENTIFIC REPORTS 2023年第1期13卷 1-13页

作者： Heris, Saeed Zeinali Ebadiyan, Hamed mousavi, Seyed Borhan Nami, Shamin Hosseini mohammadpourfard, mousa Faculty of Chemical and Petroleum Engineering University of Tabriz Tabriz Iran Xi’an University of Science and Technology No. 58 Middle Section of Yanta Road Xi’an 710054 Shaanxi China J. Mike Walker ‘66 Mechanical Engineering Department Texas A&M University College Station TX 77843 USA School of Chemical Biological and Materials Engineering The University of Oklahoma Norman OK 73019 USA Department of Energy Systems Engineering Izmir Institute of Technology Izmir Turkey

Natural gas stands as the most ecologically sustainable fossil fuel, constituting nearly 25% of worldwide primary energy utilization and experiencing rapid expansion. This article offers an extensive comparative analysis of nano filter elements, focusing on pressure drop and pollutant removal efficiency. The primary goal was to assess the superior performance of nano filter elements and their suitability as an alternative for Town Border Station (TBS). The research encompassed a six-month examination period, involving routine pressure assessments, structural examinations, and particle characterization of the filter elements. The results revealed that nano filters showed better performance in adsorbing aluminum than conventional filters, possibly due to their cartridge composition. Nano filters contained phosphorus, sulfur, and copper, while conventional filters lacked these elements. The disparity can be attributed to the finer mesh of the nano filter, capturing smaller pollutants. Although the nano filter had minimal silicon, the conventional filter showed some, posing concerns. Despite having 19 extra pleats, the nano filter maintained gas flow pressure while capturing more particles than the conventional filter.

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Generalized Wilson loop method for nonlinear light-matter interaction

arXiv

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arXiv 2022年

作者： Wang, Hua Tang, Xiuyu Xu, Haowei Li, Ju Qian, Xiaofeng Department of Materials Science and Engineering Texas A&M University College StationTX77843 United States Future Science Research Institute ZJU-Hangzhou Global Scientific and Technological Innovation Center Zhejiang University Zhejiang Hangzhou310058 China Department of Nuclear Science and Engineering Massachusetts Institute of Technology CambridgeMA02139 United States Department of Materials Science and Engineering Massachusetts Institute of Technology CambridgeMA02139 United States Department of Electrical and Computer Engineering Texas A&M University College StationTX77843 United States

Nonlinear light-matter interaction, as the core of ultrafast optics, bulk photovoltaics, nonlinear optical sensing and imaging, and efficient generation of entangled photons, has been traditionally studied by first-principles theoretical methods with the sum-over-states approach. However, this indirect method often suffers from the divergence at band degeneracy and optical zeros as well as convergence issue and high computation cost when summing over the states. Here, using shift vector and shift current conductivity tensor as an example, we present a gauge-invariant generalized approach for efficient and direct calculations of nonlinear optical responses by representing interband Berry curvature, quantum metric, and shift vector in a generalized Wilson loop. This generalized Wilson loop method avoids the above cumbersome challenges and allows for easy implementation and efficient calculations. more importantly, the Wilson loop representation provides a succinct geometric interpretation of nonlinear optical processes and responses based on quantum geometric tensors and quantum geometric potentials, and can be readily applied to studying other excited-state responses. © 2022, CC BY.

关键词： Excited states

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measuring Poisson's ratio during nanoindentation via lateral contact stiffness;Issues of slip and plasticity

arXiv

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arXiv 2021年

作者： Brazil, Owen Pharr, George m. Department of Materials Science & Engineering Texas A&M University College StationTX77843-3003 United States

Although Poisson’s ratio, ν, is a quantity of great importance in materials design, presently, very few methods are available to measure it at small scales (micrometre) and those typically involve intensive geometric refinement of the sample. In this work we show how Poisson’s ratio may be measured during nanoindentation experiments by means of a second load actuator oriented orthogonally to the primary vertical loading axis. We apply a small oscillating lateral load to Berkovich and sphero-conical indenter tips during nanoindentation experiments into fused silica and metallic samples. This enables the elastic lateral contact stiffness to be measured as a function of depth in a manner analogous to continuous stiffness measurements in conventional nanoindentation experiments. This stiffness may in turn be used to calculate ν. During constant strain rate experiments, we extract values of ν = 0.16 for fused silica and ν = 0.34 for polycrystalline aluminium over indentation depths of several hundred nanometres. We highlight two critical issues that must be addressed to ensure accurate measurement of ν during indentation: partial slip and additional plasticity brought about through the added shear under tangential loading. We study these separate phenomena in fused silica and single crystal nickel, suggesting that interfacial slip is favoured in harder, brittle materials, while plasticity is dominant in more ductile materials. We offer some suggestions on how to mitigate these problems based on tip geometry and loading protocols. Copyright © 2021, The Authors. All rights reserved.

关键词： Stiffness

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Progress in plant-based bioelectrochemical systems and their connection with sustainable development goals

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Carbon Resources Conversion 2021年第1期4卷 169-183页

作者： Enas Taha Sayed mohammad Ali Abdelkareem Khaled Obaideen Khaled Elsaid Tabbi Wilberforce Hussein m.maghrabie A.G.Olabi Center for Advanced Materials Research University of SharjahPO Box 27272SharjahUnited Arab Emirates Chemical Engineering Department Minia UniversityElminiaEgypt Dept.of Sustainable and Renewable Energy Engineering University of SharjahP.O.Box 27272SharjahUnited Arab Emirates Chemical Engineering Department Texas A&M UniversityCollege StationTX 77843-3122TXUSA Mechanical Engineering and Design Aston UniversitySchool of Engineering and Applied ScienceAston TriangleBirmingham B47ETUK Department of Mechanical Engineering Faculty of EngineeringSouth Valley UniversityQena 83521Egypt

Living organisms’energy conversion is considered as an essential and sustainable green energy source and future bio-hybrid ***,plants were used after harvesting as biomass in bio-fermentation as an energy *** bio-electrochemical systems,microorganisms work with plants to generate electricity,hydrogen,or *** work discusses the simultaneous pollutant removal and electricity generation in plant-based bio-electrochemical systems(P-BES).Factors affecting the P-BES performance and the removal efficiencies of the different organic and inorganic pollutants were ***,the plant-based bioelectrochemical systems’role in achieving the sustainable development goals(SDGs)was *** SDGs contribution of plant-based bioelectrochemical systems were presented and discussed to evaluate such systems’ability to achieve the three pillars of sustainable development,i.e.,economic,environmental,and social.

关键词： Plant Bioelectrochemical systems Sustainable development goals,pollutant removal Power generation

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Bioactive, PDmS-containing shape memory composite scaffolds with accelerated degradation rates

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Polymer 2025年 333卷

作者： Nitschke, Brandon m. Wahby, maryGrace N. Breining, Kaylee m. Grunlan, melissa A. Department of Biomedical Engineering Texas A&M University College StationTX77843 United States Department of Materials Science and Engineering Texas A&M University College StationTX77843 United States Department of Chemistry Texas A&M University College StationTX77843 United States

A self-fitting scaffold could enable a regenerative engineering approach to treat irregular craniomaxillofacial (CmF) bone defects. We have previously reported conformally fitting, shape memory polymer (SmP) scaffolds based on poly(Ε-caprolactone) (PCL). The fitting temperature (i.e., melt temperature, Tm) was tuned based on PCL architecture: linear-PCL-diacrylate (linear-PCL-DA;Tm = ∼55 °C) or star-PCL-tetraacrylate (star-PCL-TA, Tm = ∼45 °C). Scaffolds were also formed as semi-interpenetrating networks (semi-IPNs) by incorporating thermoplastic poly(L-lactic acid) (PLLA). The inclusion of a polydimethylsiloxane-dimethacrylate (PDmS-DmA) macromer and 45S5 Bioglass® (BG) were independently shown to promote hydroxyapatite (HAp) mineralization, as well as to accelerate degradation. In this study, PDmS-containing, composite SmP scaffolds were prepared with varying macromer compositions and BG concentrations. PCL/PDmS co-matrix scaffolds were formed with either linear-PCL-DA or star-PCL-TA, and PDmS-DmA (75:25 wt%). PCL/PLLA/PDmS (75:12.5:12.5 wt%) co-matrix-semi-IPNs were also formed. BG was included at relatively low concentrations (5 and 10 wt%). Composite scaffolds were fabricated to concentrate BG on the pore walls via a modified solvent-cast particulate leaching (SCPL) approach with a fused salt/BG template. PDmS-containing scaffolds preserved shape memory behavior and were non-brittle. In vitro degradation rates were accelerated for PDmS-containing composite scaffolds, owing to a combination of phase separation of polymer components and hydrophilicity imparted by the BG. Additionally, robust bioactivity was observed for PDmS-containing composite scaffolds with HAp mineralization commencing in just 1 day (1X simulated body fluid;SBF). © 2025

关键词： Scaffolds (biology)

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高度取向磷酸锆/环氧树脂纳米复合涂层的防腐蚀性能

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高分子材料科学与工程 2024年第4期40卷 72-78页

作者：雷凡冯民生李涛 Hung-Jue Sue 李姜成都大学机械工程学院四川成都610106 Polymer Technology Center Department of Materials Science and EngineeringTexas A&M UniversityCollege StationTX 77843-3123USA 高分子材料工程国家重点实验室(四川大学)四川大学高分子研究所四川成都610065

针对金属防腐蚀的需求,采用简单的喷涂法在金属基底上制备了高度取向磷酸锆/环氧树脂纳米复合涂层。利用透射电镜和X射线衍射分析探究了复合涂层中磷酸锆纳米粒子的分散形貌,采用电化学交流阻抗谱和动电位极化曲线等测试评价了复合涂层... 详细信息

针对金属防腐蚀的需求,采用简单的喷涂法在金属基底上制备了高度取向磷酸锆/环氧树脂纳米复合涂层。利用透射电镜和X射线衍射分析探究了复合涂层中磷酸锆纳米粒子的分散形貌,采用电化学交流阻抗谱和动电位极化曲线等测试评价了复合涂层的防腐蚀性能和其作用机理。结果表明,高度取向的磷酸锆纳米粒子可有效地增加水、氧气、电解液的扩散路径,改善涂层的防腐蚀性能。此外,该绝缘涂层也可进一步阻止腐蚀介质的迁移,增加涂层电阻,显著提高环氧树脂涂层对金属基底的长期防护性能。

关键词：环氧树脂磷酸锆高度取向防腐蚀性能

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Anomalous Size Effect of Impact Resistance in Carbon Nanotube Film

SSRN

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SSRN 2024年

作者： Zhang, Wei Xiao, Kailu Hu, Dongmei Huang, Chenguang Wu, Xianqian Institute of Mechanics Chinese Academy of Sciences Beijing100190 China Department of Materials Science & Engineering Texas A&M University Central Texas College StationTX77840 United States Key Laboratory of Multifunctional and Smart Systems Division of Advanced Materials Suzhou Institute of Nano-Tech and Nano-Bionics Chinese Academy of Sciences Suzhou215123 China State Key Laboratory of Explosion Science and Technology Beijing Institute of Technology Beijing100081 China Hefei Institutes of Physical Science Chinese Academy of Sciences Hefei230031 China

Dynamic mechanical behavior and size-related impact resistance of CNT films are studied by employing laser-induced projectile impact test (LIPIT) and coarse-grained molecular dynamics (CGmD) simulation. The energy dissipation mechanisms of the CNT films are investigated via CGmD simulations. An evident anomalous thickness-dependent effect is directly observed in the experiment, consistent with simulation phenomena. The mechanisms underlying this anomalous thickness-dependent effect are investigated at the atomic scale. The disparities between experiments and simulations are discussed. Our analysis of energy dissipation modes, deformation behaviors during impact, and impact area reveals that kinetic energy change predominantly governs the deformation mode. meanwhile, a plugging failure mode near the exit face of CNT film is identified at high impact velocity (~ 160 m/s), leading to a deterioration in impact resistance and a corresponding reduction in SEA with increasing CNT film thickness. These findings provide a feasible strategy for the protection design of CNT ﬁlm in broaden protective application scenarios. © 2024, The Authors. All rights reserved.

关键词： Kinetic energy

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A ductility metric for refractory-based multi-principal-element alloys

arXiv

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arXiv 2022年

作者： Singh, Prashant Vela, Brent Ouyang, Gaoyuan Argibay, Nicolas Cui, Jun Arroyave, Raymundo Johnson, Duane D. Ames Laboratory U.S. Department of Energy Iowa State University AmesIA50011 United States Department of Materials Science & Engineering Texas A&M University College StationTX77843 United States Department of Materials Science & Engineering Iowa State University AmesIA50011 United States

We propose a quantum-mechanical dimensionless metric, the local-lattice distortion (LLD), as a reliable predictor of ductility in refractory multi-principal-element alloys (RmPEAs). The LLD metric is based on electronegativity differences in localized chemical environments and combines atomic-scale displacements due to local lattice distortions with a weighted average of valence-electron count. To evaluate the effectiveness of this metric, we examined body-centered cubic (bcc) refractory alloys that exhibit ductile-to-brittle behavior. Our findings demonstrate that local-charge behavior can be tuned via composition to enhance ductility in RmPEAs. With finite-sized cell effects eliminated, the LLD metric accurately predicted the ductility of arbitrary alloys based on tensile-elongation experiments. To validate further, we qualitatively evaluated the ductility of two refractory RmPEAs, i.e., NbTamoW and mo72W13Ta10Ti2.5Zr2.5, through the observation of crack formation under indentation, again showing excellent agreement with LLD predictions. A comparative study of three refractory alloys provides further insights into the electronic-structure origin of ductility in refractory RmPEAs. This proposed metric enables rapid and accurate assessment of ductility behavior in the vast RmPEA composition space. Copyright © 2022, The Authors. All rights reserved.

关键词： Ductility

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