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An atomistic model of silk protein network for studying the effect of pre-stretching on the mechanical performances of silks

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Acta Mechanica Sinica 2022年第6期38卷 55-68,I0001页

作者： Wenhui Shen Zihan Tang Xuwei Wu Liang Pan Yuan Cheng Bo Huo Jizhou Song Weiqiu Chen Baohua Ji Dechang Li Biomechanics and Biomaterials Laboratory Department of Applied MechanicsBeijing Institute of TechnologyBeijing100081China Key Laboratory of Soft Machines and Smart Devices of Zhejiang Province Department of Engineering MechanicsZhejiang UniversityHangzhou310027China Innovative Centre for Flexible Devices(iFLEX) School of Materials Science and EngineeringNanyang Technological UniversitySingapore639798Singapore Monash Suzhou Research Institute Monash UniversitySuzhou215000China Department of Materials Science and Engineering Monash UniversityMelbourne3800Australia

Silk protein builds one of the strongest natural fibers based on its complex nanocomposite ***,the mechanical performance of silk protein,related to its molecular structure and packing is still *** this study,we constructed an atomistic silk protein network model,which reproduces the extensive connection topology of silk protein with structure details of theβ-sheet crystallites and amorphous *** the silk protein network model,we investigated the structure evolution and stress distribution of silk protein under external *** found a pre-stretching treatment during the spinning process can improve the strength of silk *** treatment improves the properties of silk protein network,i.e.,increases the number of nodes and bridges,makes the nodes distributed homogeneously,and induces the bridges in the network well aligned to the loading direction,which is of great benefit to the mechanical performances of silk *** study not only provides a realized atomistic model for silk protein network that well represents the structures and deformations of silk proteins under loading,but also gains deep insights into the mechanism how the pre-loading on silk proteins during spinning improves the mechanical properties of silk fibers.

关键词： Silk protein Amorphous domain β-sheet crystallite mechanical performances Molecular dynamics

Ultrasonic solidification mechanism and optimized application performances of ternary Mg_(71.5)Zn_(26.1)Y_(2.4) alloy

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Journal of Magnesium and Alloys 2023年第10期11卷 3829-3839页

作者： Y.J.Hu J.Y.Wang W.Zhai B.Wei School of Physical Science and Technology Northwestern Polytechnical UniversityXi’an 710072China

One dimensional(1D) and three dimensional(3D) ultrasound sources were applied to the solidification process of Mg_(71.5)Zn_(26.1)Y_(2.4) *** acoustic spectra were in-situ measured, based on which the cavitation intensities and dynamic solidification mechanism were further investigated. With the increase of ultrasonic dimension and amplitude, the primary Mg_(3)Zn_(6)Y phase was significantly refined from petals to nearly pentagonal shape. The sound field measurements showed that the transient cavitation played a decisive role in generating a high local undercooling, which facilitated the formation of icosahedral clusters and promoted the nucleation of primary Mg_(3)Zn_(6)Y phase. The morphological transition of(α-Mg+Mg_(3)Zn_(6)Y) eutectic from lamellar to anomalous structure occurred under 3D ultrasonic condition. The stable cavitation took the main responsibility because the high pressure excited by nonlinearly oscillating bubbles induced the preferential nucleation of α-Mg phase rather than Mg_(3)Zn_(6)Y phase. As compared with its static values, the tensile strength and compression plasticity of this alloy were increased by the factors of 1.9 and 2.1, and its corrosion resistance was also improved with the corrosion current density decreased by one order of magnitude.

关键词： Three dimensional ultrasounds Quasicrystalline Mg_(3)Zn_(6)Y phase Anomalous eutectic mechanical performances Corrosion resistance

Advanced nanofabrication for elastic inorganic aerogels

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Nano Research 2024年第10期17卷 8842-8862页

作者： Xiaota Cheng Xinyi Chang Fan Wu Yalong Liao Kai Pan Hao Fong Jianyong Yu Yi-Tao Liu Bin Ding Innovation Center for Textile Science and Technology College of TextilesDonghua UniversityShanghai 201620China Aerospace Institute of Advanced Material and Processing Technology Beijing 100074China College of Materials Science and Engineering Beijing University of Chemical TechnologyBeijing 100029China

Inorganic aerogels with low density,high porosity,large specific surface area,and superior mechanical properties are excellent candidate materials in fields such as thermal management,energy,catalysis,and biomedical applications.A comprehensive overview of existing elastic inorganic aerogels is provided,covering their structural units,preparation methods,mechanical performances,and ***,based on the constituent building blocks and microstructures,a detailed analysis of the mechanical properties and guidelines for elastic design of aerogels is *** with a succinct summary of prospective developmental direction,this review deliberates on the challenges and potential opportunities of elastic inorganic aerogels,with the intent of providing a versatile platform for designing new types of elastic inorganic aerogels for various applications.

关键词： inorganic aerogels compressive stretchable fabrication mechanical performances applications

Versatile sensing devices for self-driven designated therapy based on robust breathable composite films

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Nano Research 2022年第2期15卷 1027-1038页

作者： Zhaofeng Ouyang Songbo Cui Houyong Yu Dewen Xu Chuang Wang Dongping Tang Kam Chiu Tam Key Laboratory of Advanced Textile Materials and Manufacturing Technology Ministry of EducationSchool of Materials Science and EngineeringZhejiang Sci-Tech UniversityHangzhou 310018China Department of Chemical Engineering Waterloo Institute for NanotechnologyUniversity of WaterlooWaterlooON N2L 3G1Canada

Flexible wearable electronics were developed for applications such as electronic skins,human-machine interactions,healthcare monitoring,and anti-infection *** conventional materials showed impermeability,single sensing ability,and no designated therapy,which hindered their *** it was still a great challenge to develop electronic devices with multifunctional sensing properties and self-driven anti-infection ***,flexible and breathable on-skin electronic devices for multifunctional fabric based sensing and self-driven designated anti-infection therapy were prepared successfully with cellulose nanocrystals/iron(Ⅲ)ion/polyvinyl alcohol(CNC/Fe^(3+)/PVA)*** resultant composite films possessed robust mechanical performances,outstanding conductivity,and distinguished breathability(3.03 kg/(m^(2)·d)),which benefited from the multiple interactions of weak hydrogen bonds and Fe^(3+) chelation and synergistic effects among CNC,polyaniline(PANI),and ***,the film could be assembled as a multifunctional sensor to actively monitor real-time physical and infection related signals such as temperature,moisture,pH,NH3,and human movements even at sweat *** importantly,this multifunctional device could act as a self-driven therapist to eliminate bacterial by the release of Fe^(3+),which was driven by the damage of metal coordination Fe-O bonds due to the high temperature caused by infection at wound ***,the composite films had potential versatile applications in electronic skins,smart wound dressings,human-machine interactions,and self-driven anti-infection therapy.

关键词： cellulose nanocrystals polyvinyl alcohol composite films mechanical performances

Recent development,utilization,treatment and performance of solid wastes additives in asphaltic concrete worldwide:A review

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Journal of Traffic and Transportation Engineering(English Edition) 2022年第5期9卷 693-724页

作者： Tracy Leh Xin Wong Mohd Rosli Mohd Hasan Leo Choe Peng School of Civil Engineering Universiti Sains Malaysia14300 Nibong TebalPinangMalaysia School of Chemical Engineering Universiti Sains Malaysia14300 Nibong TebalPinangMalaysia

Asphalt modifications either involved commercial or recycled waste materials modifiers help optimise and improve the deficient properties of asphalt mixtures relative to current *** manuscript reviews the recycling of waste materials generated from various sources such as household,agricultural and industrial to minimise natural resources exploitation,lower energy demand,and enhance overall pavement *** actual development and implementation of recycled asphalt pavement in numerous countries in Asia,North America,South America,Europe and Africa are emphasised,and their influence on the performance of asphalt pavements is *** pavement showed satisfying performance for years as maintenance and restoration are not ***,solid wastes are required to undergo pre-requisite treatments via mechanical,biological stabilization,thermal or chemical methods before the implementation as asphalt modifiers to ease the handling *** damage issues have been spotted in the implementation of several types of solid wastes and consequently reduced the strength and durability of ***,potential hydrophobic treatment can be adopted to improve the quality of asphalt mixtures by modifying the hydrophilic characteristics that are contributed by the hydroxyl groups on the cellulose nanocrystals(CNCs)or providing a superhydrophobic coating onto the *** treatments greatly weakened the moisture sensitivity of modified materials by reducing their water absorption and increasing their water contact *** modified mixtures are necessary to have identical or enhanced pavement performance to the conventional ***,future researchers are encouraged to broaden the research field in pavement engineering by considering chemical treatments in improving material properties to achieve cost-saving,efficient waste management,and higher commercial *** implementing any virgin materials,waste material

关键词： Sustainable pavement Industrial waste Cleaner environment Resources preservation Hydrophobic treatments mechanical performances

A nanoconcrete welding strategy for constructing high-performance wound dressing

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Bioactive Materials 2022年第8期7卷 31-41页

作者： Yingshuai Wang Yanxia Zhu Penghe Zhao Bin Wei Mingjian Fan Danyang Chen Zhaokui Jin Qianjun He School of Life Science and Technology Weifang Medical UniversityWeifangShandongChina Central Laboratory Longgang District People’s Hospital of Shenzhen&the Third Affiliated Hospital(Provisional)of the Chinese University of Hong KongShenzhenGuangdongChina School of Biomedical Engineering Health Science CenterShenzhen UniversityNo.1066 Xueyuan RoadShenzhen518060GuangdongChina Department of Quantum and Energy Materials International Iberian Nanotechnology Laboratory(INL)Braga4715-330Portugal Center of Hydrogen Science Shanghai Jiao Tong UniversityShanghai200240China

Engineering biomaterials to meet specific biomedical applications raises high requirements of mechanical performances,and simultaneous strengthening and toughening of polymer are frequently necessary but very challenging in many *** this work,we propose a new concept of nanoconcrete welding polymer chains,where mesoporous CaCO3(mCaCO_(3))nanoconcretes which are composed of amorphous and nanocrystalline phases are developed to powerfully weld polymer chains through siphoning-induced occlusion,hydration-driven crystallization and dehydration-driven compression of *** mCaCO_(3) nanoconcrete welding technology is verified to be able to remarkably augment strength,toughness and anti-fatigue performances of a model polymer poly(3-hydroxybutyrate-co-3-hydroxyvalerate)-based porous ***,we have revealed polymer-occluded nanocrystal structure and welding-derived microstress which is much stronger than interfacial Van der Waals force,thus efficiently preventing the generation of microcracks and repairing initial microcracks by microcracks-induced hydration,crystallization and polymer welding of mCaCO_(3) *** porous membrane is used as wound dressing,exhibiting a special nanoplates-constructed surface topography as well as a porous structure with plentiful oriented,aligned and opened pore channels,improved hydrophilicity,water vapor permeability,anti-bacterial and cell adherence,in support of wound healing and skin structural/functional *** proposed nanoconcrete-welding-polymer strategy breaks a new pathway for improving the mechanical performances of polymers.

关键词： Tissue engineering mechanical performances Calcium carbonate Mesoporous materials Organic/inorganic nanocomposite Wound dressing