检索结果-内蒙古大学图书馆

Bioactivity and cytotoxicity of LiF-modified bioactive glass ceramics for bone regeneration

Ceramics International 2025年

作者： Selli, Neslihan Tamsü Başaran, Neslihan Kesmez, Ömer Yavaş, Adem Demir, Feride Ertürk, A. Tamer Department of Materials Science and Engineering Gebze Technical University Kocaeli Gebze41400 Turkey Department of Chemistry Faculty of Science Akdeniz University Antalya07058 Turkey Food Technology Program Food Processing Department Çine Vocational School Aydin Adnan Menderes University Aydin Turkey Agricultural Biotechnology and Food Safety Research and Application Center Aydin Adnan Menderes University Aydin Turkey Mechanical Engineering Department Kocaeli University Umuttepe Campus Kocaeli Izmit41001 Turkey

Bioactive glasses and glass-ceramics have drawn significant attention due to their excellent bone-bonding capabilities and biocompatibility. This study investigates the effects of lithium fluoride (LiF) addition on the microstructure, mechanical properties, and biocompatibility of novel bioactive glass compositions. Glasses with varying LiF contents (1, 2, and 3 wt%) were synthesized using the melt-quenching method and subsequently heat-treated to obtain bioactive glass-ceramics. X-ray diffraction (XRD) analysis revealed an increase in the intensity of hydroxyapatite, fluorapatite, and diopside phases with increasing LiF content, suggesting enhanced crystallization. Vickers hardness measurements showed a significant improvement, with the highest hardness (730 MPa) observed in the K3 composition. Scanning Electron Microscopy (SEM) was used to examine the microstructural morphology, while Energy-Dispersive X-ray Spectroscopy (EDX) was employed to analyze the elemental composition of the samples. Furthermore, in vitro bioactivity assessments in simulated body fluid (SBF) confirmed the apatite-forming ability of all compositions. Cytotoxicity evaluations demonstrated enhanced cell viability in LiF-containing compositions, with K3 exhibiting the highest biocompatibility. The findings suggest that LiF addition optimizes crystallization, mechanical performance, and biocompatibility, making these modified bioactive glass-ceramics promising candidates for biomedical applications. © 2025

关键词： Energy dispersive spectroscopy

来源：评论

学校读者我要写书评

暂无评论

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

引用

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

来源：评论

学校读者我要写书评

暂无评论

Characterization of Ureolysis and Microbially Induced Calcium Carbonate Precipitation Under Different Incubation and Reaction Conditions

SSRN

引用

SSRN 2025年

作者： Joo, Hyun-Woo Fyfe, Matthew H. Verdú, Irene Rahmaninezhad, Seyed Ali Sales, Christopher M. Srubar, Wil V. Hubler, Mija H. Department of Civil Environmental and Architectural Engineering University of Colorado Boulder BoulderCO United States Department of Civil Architectural and Environmental Engineering Drexel University PhiladelphiaPA United States Environmental Department Terracon Consulting Inc. The ColonyTX United States Department of Civil Environmental and Architectural Engineering Materials Science and Engineering Program University of Colorado Boulder BoulderCO United States Department of Biology

This study investigates the ureolysis and microbially induced calcium carbonate precipitation (MICP) characteristics of Sporosarcina pasteurii and Lysinibacillus sphaericus under varying incubation and reaction conditions. A series of batch MICP experiments were conducted to assess the effects of incubation duration and pH, bacterial cell density, and reagent (i.e., urea and calcium ion) concentrations on ureolysis and CaCO3 precipitation characteristics. The findings indicate that both bacteria exhibit higher urease activity after 24 hours of incubation compared to 48 hours, regardless of incubation pH. S. pasteurii exhibits maximum specific urease activity at an alkaline pH (pH 9.0), whereas L. sphaericus reaches peak activity at a neutral pH (pH 7.2). Across six incubation conditions for each bacterium, S. pasteurii exhibits greater sensitivity in specific urease activity, while L. sphaericus maintains a more consistent ureolysis performance. In terms of cell density, a lower OD600 (~0.1) enhances specific urease activity and early-stage mineralization efficiency, whereas a higher OD600 (~1.0) accelerates overall CaCO3 precipitation, enhances terminal-stage mineralization efficiency, and promotes the prolonged presence of vaterite. High reagent concentrations (1.0 and 1.5 M) enhance specific urease activity and CaCO3 precipitation rates and lead to over 93% of vaterite formation, while low reagent concentration (0.3 M) favors calcite-dominant precipitation over time. These findings provide insights into evaluating and optimizing MICP performance under varying incubation and reaction conditions. © 2025, The Authors. All rights reserved.

关键词： Carbonation

来源：评论

学校读者我要写书评

暂无评论

Extraordinary toughening enhancement in nonstoichiometric vanadium carbide

引用

Journal of materials science & Technology 2022年第2期97卷 176-181页

作者： Chong Peng Hu Tang Changjian Geng Pengjie Liang Biao Wan Yujiao Ke Yuefeng Wang Peng Jia Wenfeng Peng Lina Qiao Kenan Li Xiaohong Yuan Yucheng Zhao Mingzhi Wang State Key Laboratory of Metastable Materials Science and Technology Yanshan UniversityQinhuangdao 066004China Academy for Advanced Interdisciplinary Studies Southern University of Science and TechnologyShenzhen 518055China Key Laboratory of Material Physics Ministry of EducationSchool of Physics and MicroelectronicsZhengzhou UniversityZhengzhou 450052China School of Mechanical Engineering Yanshan UniversityQinhuangdao 066004China Center for High Pressure Science and Technology Advanced Research Beijing 100190China Hebei Construction Material Vocational and Technical College Qinhuangdao 066004China State Key Laboratory of Superabrasives Zhengzhou Research Institute for Abrasives&Grinding Co.Ltd.Zhengzhou 450001China

*** Fracture toughness is the ability of materials against both the initiation and propagation of cracks[1],which is a crucial mechanical property for safety-critical applications of structural *** the yield strength of ceramics is significantly higher than that of metallic materials,the fracture toughness is severely lower than that of metallic materials due to the strongly directional covalent bonding[1-3].For a long time,how to improve the fracture toughness of ceramics without the deterioration of strength(or hardness)has been one of the most challenging problems in materials science.

关键词： toughness carbide ceramics

来源：评论

学校读者我要写书评

暂无评论

SELECTIVE CLEAVAGE OF AMINE-LINKED EPOXY COMPOSITE MATRICES BY OXYGEN

SELECTIVE CLEAVAGE OF AMINE-LINKED EPOXY COMPOSITE MATRICES ...

引用

SAMPE 2023 Conference and Exhibition

作者： Lim, Y. Justin Navarro, Carlos A. Nutt, Steven R. Williams, Travis J. Loker Hydrocarbon Research Institute Wrigley Institute of Environmental Studies Department of Chemistry University of Southern California 837 Bloom Walk Los AngelesCA90089-1661 United States MC Gill Composites Center Department of Chemical Engineering and Materials Science University of Southern California 3651 Watt Way Los AngelesCA90089-0241 United States

ISBN: (纸本)9781934551431

This presentation will describe conditions for the use of oxygen as a reagent for the selective cleavage of thermoset composites. Carbon fiber-reinforced polymer (CFRP) composites have a prominent role in aviation, sporting goods, marine, and other manufacturing sectors and are accumulating en masse as waste, both at end-of-life and as manufacturing defects. We have recently introduced a method to use oxygen itself along with an appropriate catalyst selectively to disassemble such fully-cured composite wastes to recover both ordered carbon fiber sheets and organic materials suitable for re-manufacturing of second-life resin systems. © 2023 Soc. for the Advancement of Material and Process engineering. All rights reserved.

关键词： Oxygen

来源：评论

学校读者我要写书评

暂无评论

Transient multilayer analytical model of a line heat source probe for in-pile thermal conductivity measurements

Transient multilayer analytical model of a line heat source ...

引用

2023 Transactions of the American Nuclear Society Winter Conference and Expo, ANS 2023

作者： Wada, Katelyn Fleming, Austin Eixenberger, Joshua Jaques, Brian Estrada, David Micron School of Materials Science and Engineering Boise State University BoiseID83725 United States Idaho National Laboratory Idaho FallsID83415 United States Center for Advanced Energy Studies Boise State University BoiseID83725 United States Department of Physics Boise State University BoiseID83725 United States

来源：评论

学校读者我要写书评

暂无评论

Understanding and Tuning Magnetism in van der Waals-type Metal Thiophosphates

arXiv

引用

arXiv 2024年

作者： Basnet, Rabindra Hu, Jin Department of Chemistry & Physics University of Arkansas at Pine Bluff Pine BluffAR71603 United States Department of Physics University of Arkansas FayettevilleAR72701 United States Materials Science and Engineering Program Institute for Nanoscience and Engineering University of Arkansas FayettevilleAR72701 United States

Over the past two decades, significant progress in two-dimensional (2D) materials has invigorated research in condensed matter and material physics in low dimensions. While traditionally studied in three-dimensional systems, magnetism has now been extended to the 2D realm. Recent breakthroughs in 2D magnetism have captured substantial interest from the scientific community, owing to the stable magnetic order achievable in atomically thin layers of the van der Waals (vdW)-type layered magnetic materials. These advances offer an exciting platform for investigating related phenomena in low dimensions and hold promise for spintronic applications. Consequently, vdW magnetic materials with tunable magnetism have attracted significant attention. Specifically, antiferromagnetic metal thiophosphates MPX3 (M = transition metal, P = phosphorus, X = chalcogen) have been investigated extensively. These materials exhibit long-range magnetic orders spanning from bulk to the 2D limit. The magnetism in MPX3 arises from localized moments associated with transition metal ions, making it tunable via substitutions and intercalations. In this review, we focus on such tuning by providing a comprehensive summary of various metal- and chalcogen-substitution and intercalation studies, along with the mechanism of magnetism modulation, and a perspective on the development of this emergent material family. © 2024, CC0.

关键词： Van der Waals forces

来源：评论

学校读者我要写书评

暂无评论

Corner cutting connects chiral colorimetry to net electric flux in lossless all-dielectric metasurfaces

arXiv

引用

arXiv 2024年

作者： Haddadin, Zaid Nguyen, Anna M.Y. Poulikakos, Lisa V. Department of Electrical & Computer Engineering UC San Diego La Jolla CA92093-0021 United States Department of Mechanical & Aerospace Engineering UC San Diego La Jolla CA92093-0021 United States Program of Materials Science & Engineering UC San Diego La Jolla CA92093-0021 United States

All-dielectric metasurfaces can produce structural colors, but the most advantageous design criteria are still being investigated. This work numerically studies how the two-dimensional shape of nanoparticles affects the colorimetric response under circularly polarized light (CPL) to develop a sensor distinguishing CPL orientations. Using lossless dielectric materials (silicon nitride on silicon dioxide), we achieve far-field dichroism by modifying oblong nanoparticles into L-shaped structures through corner cuts. This design suppresses one electric dipole under CPL illumination, leading to differential colorimetric responses. We link these responses to a decoupling effect in the near-field net electric flux. Our findings provide design guidelines for all-dielectric, lossless colorimetric sensors of chiral light. Copyright © 2024, The Authors. All rights reserved.

关键词： Silicon nitride

来源：评论

学校读者我要写书评

暂无评论

Efficient Access to Spiro[Quinazoline-Thiophen](Thi)Ones Via Acetic Acid Catalyzed [3 + 2] Annulation of Quinazolin(Thi)One Enamines with Dithianediol

SSRN

引用

SSRN 2024年

作者： Fang, Jingxi Pan, Zhentao Rao, Yingbo Ma, Yongmin Miao, Maozhong School of Chemistry and Chemical Engineering Key Laboratory of Surface & Interface Science of Polymer Materials of Zhejiang Province Zhejiang Sci-Tech University Zhejiang Hangzhou310018 China Institute of Advanced Studies School of Pharmaceutical and Chemical Engineering Taizhou University 1139 Shifu Avenue Taizhou318000 China

A metal-free approach to the construction of novel spiro[quinazoline-thiophen]one framework via an acetic acid promoted formal [3 + 2] cycloaddition is developed. A library of functionalized spiro[quinazoline-thiophen](thi)ones were efficiently synthesized in good to excellent yields under mild conditions. The protocol features high atom-economy, an eco-benign catalyst and molecular diversity. © 2024, The Authors. All rights reserved.

关键词： Acetic acid

来源：评论

学校读者我要写书评

暂无评论

Reliability of Deployed Organic Photovoltaic Modules

Reliability of Deployed Organic Photovoltaic Modules

引用

IEEE Conference Photovoltaic Specialists (PVSC)

作者： Hafiz K. M. Sheriff Yongxi Li Sammy Saad Stephen R. Forrest Applied Physics Program University of Michigan Ann Arbor Michigan USA Department of Electrical Engineering University of Michigan Ann Arbor Michigan USA Department of Physics University of Michigan Ann Arbor Michigan USA Department of Materials Science and Engineering University of Michigan Ann Arbor Michigan USA

ISBN: (数字)9781665464260

ISBN: (纸本)9781665475822

The commercial future of organic photovoltaics (OPVs) relies on their efficiency and reliability. Recent progress in the field has ensured the achievement of device efficiency comparable to those of commercial silicon-based photovoltaics (Si-PVs) [1]. In pursuit of reliable devices, recent works have demonstrated the intrinsic stability of both small-molecule, vacuum deposited [2] and non-fullerene acceptor (NFA) – polymer-based devices [3] under controlled laboratory conditions. The final step for outdoor deployment is therefore a demonstration of the reliability of large area OPV modules in the field, subjected to fluctuating environmental conditions such as humidity, temperature, rainfall, snow, and solar intensity. In this work, we develop a customized test facility intended for the study of the reliability of large area OPV modules deployed in outdoor environments. The facility is designed for automated in-situ measurements calibrated to 1 sun solar intensity, AM 1.5 G illumination. Initial data show the modules retain more than 95% of their initial performance for 150 h when exposed to varying solar intensities, temperature fluctuations of -2°C to 10°C, and relative humidity as high as 90%. The only significant extrinsic challenge to device stability observed was the ingress of water into the package. This is mitigated by improved packaging which utilizes polyisobutylene (PIB) encapsulation and a customized insulated glass unit (IGU).

关键词： Temperature measurement Temperature distribution Test facilities Rain Snow Humidity Solar panels Polymers Sun Thermal stability

来源：评论

学校读者我要写书评

暂无评论

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

请选择保存的检索档案：

请选择收藏分类：

通借通还

建议与咨询 留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

请选择保存的检索档案： 新增检索档案 确定 取消

请选择收藏分类： 新增自定义分类 确定 取消

通借通还

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

请选择保存的检索档案：

请选择收藏分类：