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self-healing behavior of Ti_(2)AlC at a low oxygen partial pressure

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Journal of Advanced Ceramics 2022年第11期11卷 1687-1695页

作者： Boxiang YAO Shibo LI Weiwei ZHANG Wenbo YU Yang ZHOU Shukai FAN Guoping BEI Center of Materials Science and Engineering School of MechanicalElectronic and Control EngineeringBeijing Jiaotong UniversityBeijing 100044China China Porcelain Fuchi(Suzhou)High Tech Nano Materials Co. Ltd.Suzhou 215100China

Ti_(2)AlC,a MAX phase ceramic,has an attractive self-healing ability to restore performance via the oxidation-induced crack healing mechanism upon healing at high temperatures in air(high oxygen partial pressures).However,such healing ability to repair damages in vacuum or low oxygen partial pressure conditions remains unknown.Here,we report on the self-healing behavior of Ti_(2)AlC at a low oxygen partial pressure of about 1 Pa.The experimental results showed that the strength recovery depends on both healing temperature and time.After healing at 1400℃for 1–4 h,the healed samples exhibited the recovered strengths even exceeding the original strength of 375 MPa.The maximum recovered strength of~422 MPa was achieved in the healed Ti_(2)AlC sample after healing at 1400 for 4 h,about 13%higher than the original strength.Damages were healed by the formed℃TiCx from the decomposition of Ti_(2)AlC.The decomposition-induced crack healing as a new mechanism in the low oxygen partial pressure condition was disclosed for the MAX ceramics.The present study illustrates that key components made of Ti_(2)AlC can prolong their service life and keep their reliability during use at high temperatures in low oxygen partial pressures.

关键词： MAX ceramics Ti_(2)AlC self-healing low oxygen partial pressures strength recovery mechanism

A self-healing and conductive ionic hydrogel based on polysaccharides for flexible sensors

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Chinese Journal of Chemical Engineering 2023年第1期53卷 73-82页

作者： Yufei Wang Zihao Chen Rui Chen Jie Wei Beijing Engineering Research Center for the Synthesis and Applications of Waterborne Polymers Beijing 100029China Key Laboratory of Carbon Fibers and Functional Polymers Ministry of EducationBeijing 100029China College of Materials Science and Engineering Beijing University of Chemical TechnologyBeijing 100029China

In this study,we proposed a self-healing conductive hydrogel based on polysaccharides and Li+to serve as flexible sensors.At first,the oxidized sodium alginate(OSA)was obtained through the oxidation reaction of sodium alginate(SA).Then OSA,carboxymethyl chitosan(CMC),and agarose(AGO)were dissolved in LiCl solution,respectively.Finally,the hydrogel was obtained through heating,mixing,and cooling processes.Because of the Schiff base structure and hydrogen bonding,the hydrogel demonstrates good mechanical and self-healing properties.The presence of Li+provides good conductivity for the hydrogel.In addition,we demonstrated the application of the hydrogel as the flexible sensors.It can perceive the process of pressing Morse code with the index finger as a pressure sensor and monitor sliding movement of the thumb as the strain sensor to browse the web with the mobile phone.Thus,the selfhealing conductive hydrogel may have potential applications in flexible wearable sensors.

关键词： Hydrogel self-healing Conductivity Polysaccharide Flexible sensor

Epoxy microcapsules for high-performance self-healing materials using a novel method via integrating electrospraying and interfacial polymerization

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Journal of Materials Science & Technology 2022年第17期112卷 59-67页

作者： He Zhang Kaibin Xiao Zhilin Lin Shengyu Shi Guangdong Provincial Key Laboratory of Technique and Equipment for Macromolecular Advanced Manufacturing South China University of TechnologyGuangzhou 510641China National Engineering Research Center of Novel Equipment for Polymer Processing Key Laboratory of Polymer Processing Engineering(SCUT)Ministry of EducationSouth China University of TechnologyGuangzhou 510641China

The high-efficiency fabrication of high-quality microcapsules containing epoxy is crucial to the further development of the potential practical self-healing epoxy systems based on microencapsulated two-part epoxy-amine chemistry.Herein,a novel microencapsulation technique based on non-equilibrium droplets via integrating electrospraying and interfacial polymerization(ES-IP)was established to efficiently microencapsulate epoxy monomers.The ES-IP technique,consisting of three continuous steps,i.***.electrospraying to massively generate droplets,enwrapping every single droplet through instant interfacial polymerization,and thickening shell at an elevated temperature,has great flexibility to regulate the microencapsulation process and the microcapsule quality.The fabricated core-shell structured epoxy microcapsules(Ep-MCs)were comprehensively characterized for their properties,showing that they have high cleanness with rare impurities,controllable and tunable size,good thermal stability and tightness,and high effective core fraction.The high-quality Ep-MCs were adopted to formulate a self-healing epoxy based on the microencapsulated epoxy-amine chemistry.The highest healing efficiency,in terms of the recovered mode I fracture toughness,of 110±17%was achieved after being healed at room temperature(~25℃)for 48 h.While the developed ES-IP technique facilitates the microencapsulation technique based on non-equilibrium droplets,the fabricated high-quality Ep-MCs greatly promote the further developments of the practical self-healing materials.

关键词： Epoxy Microcapsule Electrospraying Interfacial polymerization self-healing

Brominated Butyl Rubber Anticorrosive Coating and its self-healing Behaviors

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Chinese Journal of Polymer Science 2023年第2期41卷 297-305页

作者： Guang-Bing Luo Bo Pang Xing-Qi Luo Yi Wang Hong Zhou Li-Juan Zhao College of Chemistry and Materials Science Sichuan Normal UniversityChengdu610066China The Second Research Institute of Civil Aviation Administration of China(CAAC) Chengdu610041China

self-healing anticorrosive coatings in extreme environment have attracted considerable interest from researchers.In this work,4-tert-butylpyridine(TBP)was incorporated into brominated butyl rubber(BIIR)polymer networks to form a reversible ionic bond with the highly reactive bromine anion.Based on the low glass transition temperature of the BIIR polymer and the electrostatic effects,a robust self-healing anticorrosive coating of TBP-BIIR was prepared.TBP-BIIR coating showed a maximum protection efficiency(PE)of more than 94%(TBP-BIIR-acid,94.37%;TBP-BIIR-alkali,94.95%;TBP-BIIR-salt,95.49%)when treated with a strong acid(HNO_(3),pH=2),strong base(NaOH,pH=12)and high salt solution(3.5 wt%NaCl).In addition,the PE of coating repaired exceed 89%,and the maximum PE value was approximately 95%in different solutions,which demonstrated its extinguished self-healing abilities.These results indicated that the TBP-BIIR anticorrosive coating could provide excellent safety and durability in special environment,which would be extremely beneficial to improve the working life of metal parts used in aviation and shipping,oil and gas and related industries.

关键词： Brominated butyl rubber self-healing Anticorrosive Coating

A self-healing liquid metal anode for lithium-ion batteries

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Journal of Energy Chemistry 2022年第9期31卷 522-531,I0015页

作者： Yaqin Qi Chao Shen Qian Hou Zengying Ren Ting Jin Keyu Xie State Key Laboratory of Solidification Processing Center for Nano Energy MaterialsSchool of Materials Science and EngineeringNorthwestern Polytechnical University and Shaanxi Joint Laboratory of Graphene(NPU)Xi’an 710072ShaanxiChina Research&Development Institute of Northwestern Polytechnical University in Shenzhen Northwestern Polytechnical UniversityShenzhen 518057GuangdongChina

The gallium-based liquid metal as one of the self-healing materials has gained wide attention, especially in the energy storage system. However, volume expansion with the ‘‘liquid-solid-liquid”transformation process still leads to un-controlled electrode failure, which stimulates the irreversibility of liquid metal and hinders their self-healing effect as the anode for lithium-ion batteries. Herein, the polypyrrole(PPy) with highly conductive and adhesive features is first introduced to fasten the liquid metal nanoparticles(gallium-tin alloy, EGaSn) in the integrated electrode and applied as the anode for lithium-ion batteries. A tightly PPy wrapped EGaSn nanoparticles structure is formed during the in-situ polymerization synthesis process, which effectively avoids the detachment of solid alloyed products. Based on the features of PPy, polyacrylic acid is added to facilitate strengthening the integrity of the electrode by constructing the hydrogen bond. The ‘‘dual-insurance” design endows the EGaSn to exhibit superior electrochemical kinetics and an astonishing self-healing effect. As a result, the customized anode displays superior cycling stability(499.8 mAh g^(-1) after 500 cycles at 1.0 A g^(-1))and rate capability(350 mAh g^(-1) at 2.0 A g^(-1)).This work enriches the electrode engineering technology of liquid metal nanoparticles and opens up a new way to customize the self-healing anode for lithium-ion batteries.

关键词： Liquid metal self-healing Polypyrrole Li-ion battery Stability

Recyclability and self-healing of Dynamic Cross-Linked Polyimide with Mechanical/Electrical Damage

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Energy & Environmental Materials 2023年第1期6卷 401-407页

作者： Baoquan Wan Ming-Sheng Zheng Xing Yang Xiaodi Dong Yuchao Li Yiu-Wing Mai George Chen Jun-Wei Zha School of Chemistry and Biological Engineering University of Science and Technology BeijingBeijing 100083China Beijing Advanced Innovation Center for Materials Genome Engineering University of Science and Technology Beijing 100083China Shunde Graduate School of University of Science and Technology Beijing Foshan 528300China School of Materials Science and Engineering Liaocheng UniversityLiaocheng 252059China Centre for Advanced Materials Technology(CAMT) School of AerospaceMechanical and Mechatronic EngineeringThe University of SydneySydney New South Wales 2006Australia Department of Electronics and Computer Science University of SouthamptonSouthampton SO171BJUK

Recyclability and self-healing are two most critical factors in developing sustainable polymers to deal with environmental pollution and resource waste.In this work,a dynamic cross-linked polyimide insulation film with full closed-loop recyclability is successfully prepared,which also possesses good self-healing ability after being mechanical/electrical damaged depending on the Schiff base dynamic covalent bonds.The recycled and self-healed polyimide film still maintain its good tensile strength(r t)>60 MPa with Young’s modulus(E)>4 GPa,high thermal stability with glass transition temperature(T g)>220℃,and outstanding insulation property with breakdown strength(E 0)>358 kV mm^(-1),making it a very promising low energy consumption and high temperature resistant insulation material.The strategy of using Schiff base dynamic covalent bonds for reversible repairing the structure of high T g polyimides promotes the wider application of such sustainable and recyclable material in the field of electrical power and micro-electronics.

关键词： electrical damage polyimide recyclability self-healing

Decentralized Bilateral Risk-based self-healing Strategy for Power Distribution Network with Potentials from Central Energy Stations

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Journal of Modern Power Systems and Clean Energy 2023年第1期11卷 179-190页

作者： Chaoxian Lv Rui Liang Yuanyuan Chai School of Electrical Engineering China University of Mining and TechnologyXuzhouChina School of Electrical Engineering Hebei University of TechnologyTianjinChina

Owing to potential regulation capacities from flexible resources in energy coupling,storage,and consumption links,central energy stations(CESs)can provide additional support to power distribution network(PDN)in case of power disruption.However,existing research has not explicitly revealed the emergency response of PDN with leveraging multiple CESs.This paper proposes a decentralized self-healing strategy of PDN to minimize the entire load loss,in which multi-area CESs’potentials including thermal storage and building thermal inertia,as well as the flexible topology of PDN,are reasonably exploited for service recovery.For sake of privacy preservation,the co-optimization of PDN and CESs is realized in a decentralized manner using adaptive alternating direction method of multipliers(ADMM).Furtherly,bilateral risk management with conditional value-at-risk(CVaR)for PDN and risk constraints for CESs is integrated to deal with uncertainties from outage duration.Case studies are conducted on a modified IEEE 33-bus PDN with multiple CESs.Numerical results illustrate that the proposed strategy can fully utilize the potentials of multi-area CESs for coordinated load restoration.The effectiveness of the performance and behaviors’adaptation against random risks is also validated.

关键词： Power distribution network(PDN) central energy station(CES) bilateral risk management self-healing alternating direction method of multipliers(ADMM)

An injectable,self-healing,electroconductive extracellular matrix-based hydrogel for enhancing tissue repair after traumatic spinal cord injury

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Bioactive Materials 2022年第1期7卷 98-111页

作者： Yian Luo Lei Fan Can Liu Huiquan Wen Shihuan Wang Pengfei Guan Dafu Chen Chengyun Ning Lei Zhou Guoxin Tan School of Chemical Engineering and Light Industry Guangdong University of TechnologyGuangzhou510006China School of Materials Science and Engineering National Engineering Research Center for Tissue Restoration and ReconstructionSouth China University of TechnologyGuangzhou510641China Department of Orthopedic Surgery The First Affiliated HospitalZhejiang University School of MedicineHangzhou310003China Department of Radiology The Third Affiliated Hospital of Sun Yat-Sen UniversityGuangzhou510630Guangdong ProvinceChina Department of Child Developmental&Behavioral Center The Third Affiliated Hospital of Sun Yat-sen UniversityGuangzhou510630China Department of Spine Surgery The Third Affiliated Hospital of Sun Yat-sen UniversityGuangzhou510630China Beijing Research Institute of Traumatology and Orthopaedics Beijing Jishuitan HospitalBeijing100035China

Injectable biomaterial-based treatment is a promising strategy to enhance tissue repair after traumatic spinal cord injury(SCI)by bridging cavity spaces.However,there are limited reports of injectable,electroconductive hydrogels with self-healing properties being employed for the treatment of traumatic SCI.Hence,a natural extracellular matrix(ECM)biopolymer(chondroitin sulphate and gelatin)-based hydrogel containing polypyrrole,which imparted electroconductive properties,is developed for traumatic SCI repair.The resulting hydrogels showed mechanical(~928 Pa)and conductive properties(4.49 mS/cm)similar to natural spinal cord tissues.Moreover,the hydrogels exhibited shear-thinning and self-healing abilities,which allows it to be effectively injected into the injury site and to fill the lesion cavity to accelerate the tissue repair of traumatic SCI.In vitro,electroconductive ECM hydrogels promoted neuronal differentiation,enhanced axon outgrowth,and inhibited astrocyte differentiation.The electroconductive ECM hydrogel activated endogenous neural stem cell neurogenesis in vivo(n=6),and induced myelinated axon regeneration into the lesion site via activation of the PI3K/AKT and MEK/ERK pathways,thereby achieving significant locomotor function restoration in rats with spinal cord injury(pself-healing electroconductive ECM-based hydrogels developed in this study are ideal biomaterials for treatment of traumatic SCI.

关键词： Hydrogel Injectability self-healing Conductivity Traumatic spinal cord injury

Supertough spontaneously self-healing polymer based on septuple dynamic bonds integrated in one chemical group

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Science China Chemistry 2022年第2期65卷 363-372页

作者： Luzhi Zhang Qingbao Guan Ao Shen Rasoul Esmaeely Neisiany Zhengwei You Meifang Zhu State Key Laboratory for Modification of Chemical Fibers and Polymer Materials Shanghai Belt and Road Joint Laboratory of Advanced Fiber and Low-dimension Materials(Donghua University)College of Materials Science and EngineeringShanghai Engineering Research Center of Nano-Biomaterials and Regenerative MedicineInstitute of Functional MaterialsDonghua UniversityResearch Base of Textile Materials for Flexible Electronics and Biomedical ApplicationsChina Textile Engineering SocietyShanghai 201620China Department of Materials and Polymer Engineering Hakim Sabzevari UniversitySabzevar ***Iran

The development of spontaneously self-healing materials with excellent mechanical properties remains a formidable challenge despite the extensive interest in such materials. This is because the self-healing and mechanical properties of a material are usually optimized via contradictory routes. The present study demonstrated a supertough spontaneously self-healing polymer,Fe-(2,6-diacetylpyridine dioxime)-urethane-based polyurethane(Fe-PPOU) based on septuple dynamic bonds integrated in one chemical group. A synergistic effect was induced by the presence of multiple dynamic crosslinking points, which comprised the integrated dynamic interactions, and the hidden lengths of the folded polymeric chains in Fe-PPOU. Thus, the mechanical and self-healing properties of the polymer were simultaneously optimized. Fe-PPOU demonstrated the highest reported toughness(139.8 MJ m^(-3)) among all the room-temperature spontaneously self-healing polymers with a nearly 100% healing rate. Fe-PPOU exhibited instant(30 s) self-healing to reach a strength of 1.6 MPa that was higher than the original strength of numerous recently reported self-healing polymers.

关键词： oxime-urethane bonds hydrogen bonds metal-coordination bonds 2 6-diacetylpyridine dioxime self-healing