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Morphology and Thermal Properties of core-shell PVA/PLA Ultrafine fibers Produced by Coaxial Electrospinning

Materials Sciences and Applications 2015年第2期6卷 189-199页

作者： Raquel P.Goncalves Flavia F.F.da Silva Paulo H.S.Picciani Marcos L.Dias Institute of Macromolecules Federal University of Rio de JaneiroRio de JaneiroBrazil

Coaxial electrospinning process was used to produce biodegradable membranes made of coreshell fibers of a poly(lactic acid) (PLA) shell and a poly(vinyl alcohol) (PVA) core. Scanning electron microscopy analyses of these structures showed that the PLA shell can present certain porosity depending on the process condition. FTIR-ATR and contact angle measurements also suggested imprisonment of the PVA core within the PLA shell. This type of structure was also confirmed by means of transmissions electron microscopy. The morphology of these fibers was dependent on the flow rate of both core and shell solutions, and homogeneous and smooth surface was only attained when the flow rate of the external PLA solution was 4 times the flow rate of the internal PVA solution. The increase in the PLA solution flow rate increases the diameter of the core-shell fiber which reaches up to 1.7 μm. Nevertheless, fibers with smaller average diameter could also be produced (200 nm). These core-shell fibers presented improved hydrophilicity as compared with monolithic PLA fibers.

关键词： core-shell fibers Electrospinning Poly(Lactic Acid) Poly(Vinyl Alcohol)

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Poly(dimethyl siloxane)anti-corrosion coating with wide pH-responsive and self-healing performance based on core-shell nanofiber containers

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Journal of Materials Science & Technology 2022年第6期101卷 128-145页

作者： Xiaohong Ji Wei Wang Xia Zhao Lifei Wang Fubin Ma Yanli Wang Jizhou Duan Baorong Hou Key Laboratory of Marine Environmental Corrosion and Bio-fouling Institute of OceanologyChinese Academy of SciencesQingdao 266071China School of Materials Science and Engineering Ocean University of China238 Songling RoadQingdao 266100China Open Studio for Marine Corrosion and Protection Pilot National Laboratory for Marine Science and TechnologyQingdao 266237China Center for Ocean Mega-Science Chinese Academy of ScienceQingdao 266071China School of Chemistry and Chemical Engineering Guangxi UniversityNanning 530004China

In this research,core-shell electrospun fibers loaded with the shell of cellulose acetate and the core of oleic acid and alkyd varnish resin were synthesized and used within poly(dimethyl siloxane)(PDMS)to prepare self-healing and p H-responsive coatings for a steel *** morphology of the electrospun fibers was characterized by scanning electron microscopy,transmission electron microscopy and confocal fluorescence *** gravimetric analysis and Fourier transform infrared spectroscopy revealed that the self-healing agents were loaded successfully with a loading rate of 2.9%.The properties of the fiber-PDMS composite coating were characterized by water contact angle measurements,mechanical tests,electrochemical impedance spectroscopy,and scanning Kelvin *** show that the maximum self-healing efficiencies of the fiber-PDMS coating in alkaline and acidic solution are 95.96%and 97.04%,*** composition of the self-healing agents at the damaged part of the coating was verified by an infrared mapping test and using an energy dispersive *** addition,the sandpaper abrasion test shows the hydrophobic effect of fiber-PDMS coating remains above 88.2%and decreases slightly through the addition of abrasion *** research can pave the way for the industrial applications of p H-responsive self-healing coatings.

关键词： core-shell fibers Self-healing coating Oleic acid Hydrophobic effect

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Super-Tough and Environmentally Stable Aramid Nanofiber@MXene Coaxial fibers with Outstanding Electromagnetic Interference Shielding Efficiency

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Nano-Micro Letters 2022年第7期14卷 72-85页

作者： Liu-Xin Liu Wei Chen Hao-Bin Zhang Lvxuan Ye Zhenguo Wang Yu Zhang Peng Min Zhong-Zhen Yu State Key Laboratory of Organic-Inorganic Composites College of Materials Science and EngineeringBeijing University of Chemical TechnologyBeijing 100029People’s Republic of China Beijing Key Laboratory of Advanced Functional Polymer Composites Beijing University of Chemical TechnologyBeijing 100029People’s Republic of China Beijing Advanced Innovation Center for Soft Matter Science and Engineering Beijing University of Chemical TechnologyBeijing 100029People’s Republic of China

Although electrically conductive and hydrophilic MXene sheets are promising for multifunctional fibers and electronic textiles,it is still a challenge to simultaneously enhance both conductivity and mechanical properties of MXene fibers because of the high rigidity of MXene sheets and insufficient inter-sheet ***,we demonstrate a core-shell wet-spinning methodology for fabricating highly conductive,super-tough,ultra-strong,and environmentally stable Ti_(3)C_(2)T_(x) MXene-based core-shell fibers with conductive MXene cores and tough aramid nanofiber(ANF)*** highly orientated and low-defect structure endows the ANF@MXene core-shell fiber with supertoughness of~48.1 MJ m^(-3),high strength of~502.9 MPa,and high conductivity of~3.0×10^(5)S m^(-1).The super-tough and conductive ANF@MXene fibers can be woven into textiles,exhibiting an excellent electromagnetic interference(EMI)shielding efficiency of 83.4 dB at a small thickness of 213μ***,the protection of the ANF shells provides the fibers with satisfactory cyclic stability under dynamic stretching and bending,and excellent resistance to acid,alkali,seawater,cryogenic and high temperatures,and *** oxidation resistance of the fibers is demonstrated by their wellmaintained EMI shielding *** multifunctional core-shell fibers would be highly promising in the fields of EMI shielding textiles,wearable electronics and aerospace.

关键词： core-shell fibers MXene sheets Electromagnetic interference shielding Aramid nanofibers Super-toughness

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Hierarchically electrospun nanofibers and their applications:A review

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Nano Materials Science 2021年第3期3卷 213-232页

作者： Muhammad Badmus Jing Liu NüWang Norbert Radacsi Yong Zhao School of Engineering Institute for Materials and ProcessesUniversity of EdinburghRobert Stevenson RoadEdinburghEH93FBUnited Kingdom Key Laboratory of Bioinspired Smart Interfacial Science and Technology of Ministry of Education School of ChemistryBeihang UniversityBeijing100191PR China

Electrospinning is a popular method for generating long and continuous nanofibers due to its simplicity and ***,conventional electrospun products have weak strength and low availability,which restrict their functionality in complex *** morphology introduces additional and distinctive structural layers onto electrospun *** requires either an extra fabrication step or controlling electrospinning parameters to achieve the desired *** morphology can improve the properties of electrospun nanofibers while also mitigating the undesired *** review discusses the primary and secondary hierarchical structures of electrospun *** structures were found to enhance the functionality of nanomaterials and improve pore connectivity and surface areas of electrospun nanofibers.A further advantage is the ability to impart multiple functionalities on *** a better understanding of some of the dominant hierarchical structures,nanomaterials applications in drug delivery,tissue engineering,catalysis,and energy devices industries can be improved.

关键词： Hierarchical structures Electrospun nanofibers Hollow fibers core-shell fibers

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