CERAMICS INTERNATIONAL
·
2020
·
IF 3.83
Anzhe Wang,Ping Hu,Xinyuan Zhao,Zhizhi Wang,Cong Zhang,Yongzheng Wang
Although important, fracture strength in structural ceramics remains difficult to predict due to the inherent micropores, and there is a tremendous need for more precise modelling of pore-like flaw-strength relationship. In this study, classical crack problems were successfully transformed into pore-like flaw-strength models by adding a reasonable stress correction factor proposed by Gomez. Based on the accurate fracture toughness measurement and the precise laser introduction of flaws vs strength tests, the optimized Sato-Takahashi model, which is suitable for any cross-sectional shapes and sharpness flaws, was found to have fairly good prediction for fracture strength in five typical structural ceramics. The experimental error at very small-sized flaws was analyzed from the aspects of the critical flaw size and the inherent flaw size detected by nano-CT. Overall, the simple and user-friendly optimized Sato-Takahashi model could pave the way for quantitative assessments of reliability and failure causes for fine ceramics.
研究领域:
材料科学
·
工程力学
✓ 已验证
产品关联
DOI
高影响因子
KEY ENGINEERING MATERIALS
·
2018
·
IF 0
Wu Lei,Ben Ma,Jian Pu,Chi Bo,Li Jian
As the ceramic substrate materials in automobile oxygen sensor, 5YSZ/Al2O3 matrix composite ceramic with different amount of silica are prepared by ball-milling,tape casting and sintering.They are investigated for their microstructure and mechanical properties.The microstructure of the sample is analyzed by Scanning Electron Microscopy (SEM) and Energy Dispersive X-Ray Spectroscopy (EDX).Fracture strength is measured by ring-on-ring method. It is found that adding 1 wt.% SiO2 into 5YSZ/Al2O3 matrix can improve the strength of composite ceramics.
研究领域:
材料科学
·
机械工程
✓ 已验证
产品关联
DOI
TEXTILE RESEARCH JOURNAL
·
2020
·
IF 1.926
Guizhen Ke,Zhiheng Xiao,Xinya Jin,Lixiang Yu,Jianqiang Li,Huixia Zhang
The formaldehyde-free crease-proof finishing agent 1,2,3,4,-butanetetracarboxylic acid (BTCA) was used to treat lyocell fabrics. The effects of BTCA concentration and curing temperature on the wrinkle recovery angle (WRA) and tensile breaking strength of lyocell fabrics were discussed. The results showed that with the increase of BTCA concentration and curing temperature, the WRA value of lyocell fabrics increased obviously and the maximum WRA reached 147°, but breaking strength decreased gradually and the minimum strength retention was 68%. The WRA was durable against laundering. The fabric whiteness difference was not obvious and the whiteness retention of all samples exceeded 98%. After further alkali treatment, the WRA of the treated lyocell fabrics decreased and the fracture strength retention recovered to varying degrees (0.45–10.8%). The developed regression equations were found to be in good correlation (r2 > 92%) with the selected variables (tensile strength, BTCA concentration, curing temperature). Fourier transform infrared spectroscopy analysis confirmed that the tensile strength loss of BTCA-treated lyocell fabrics was caused by cross-linking of cellulose molecules and acid degradation. Tensile strength loss that resulted from ester bonding could be restored after hydrolysis in alkaline solution. The recoverable magnitude of tensile strength was related to the curing temperature. A high temperature not only promoted the cross-linking of cellulose macromolecules, but also accelerated the acid degradation of cellulose.
研究领域:
纺织科学
·
材料化学
✓ 已验证
产品关联
DOI
高影响因子
ACS Applied Nano Materials
·
2024
·
IF 5.3
Liangguang Liu,Hui Yu,Junzhuo Wang,Lianjun Wang,Wan Jiang,Jianlin Li,Yixuan Wang
Bioinspired interfacial structures in materials, such as nacre-inspired masonry structures and bionic mechanical interlocking structures, can produce unique effects that enable unprecedented material mechanical properties. However, the smooth interface in ceramic materials is known to elicit weakening effects on mechanical properties, easily causing catastrophic damage in industrial production. Here, inspired by the suture structure of fish, zirconia-toughed alumina (ZTA) is fabricated with a bioinspired suture structure interface by introducing a graphene nanosheet (GNS) through tailoring the interfacial atomic diffusive rate on a ZTA composite, and its effect on fracture strength is measured. The results show that the flexural strength of ZTA modified by 0.14% GNS is 865.4 MPa, which is 60.2% higher than that of ZTA without GNS modification. Subsequently, the local grain boundary slip resistance on the suture interface is calculated using finite element simulation, which reveals that the suture interface of the Al2O3 matrix had higher resistance values than the smooth interface under applied load, which could improve the hardness, flexural strength, and fracture toughness. This unique suture interface intensifies the interface strength and essentially improves the force transmission. This work provides guidance for bionic optimization of the grain boundary structure of structural ceramics and a new idea for the structural design of high-strength and -toughness ceramics.
研究领域:
材料科学
·
仿生学
·
陶瓷工程
✓ 已验证
产品关联
DOI
高影响因子
FIBERS AND POLYMERS
·
2023
·Vol. 24
·期 6
·1903-1917
·
IF 2.5
Tian Qianjun,Huang Zhichao,Wang Lin,Shi Lei,Shen Liangen,Qi Dongming
Self-healing polyurethane materials with excellent mechanical properties have a wide range of applications, including textiles, clothing, leather, and flexible electronics. However, determining methods to obtain this material in green and environment-friendly ways is an interesting and challenging task. In this study, a series of self-healing polyurethane materials with soft segments containing diselenide bonds and hard segments including multiple hydrogen bonds were prepared using a solvent-free method. The characterization results demonstrated that the T–Se–SFPU–2 sample exhibited both favorable self-healing function as well as mechanical properties with a tensile breaking strength of 6.15 MPa, and the greatest healing effect was achieved after 6 h at room temperature under visible light. The research results further demonstrated that the hydrogen bond in the hard segment can considerably improve the mechanical properties of polyurethane. The best micro-phase separation was achieved by controlling the hydrogen bond content in the hard segment, achieving a force balance between the soft and hard segments, and finally, the optimal balance between the self-healing performance and mechanical strength of polyurethane was achieved. These results provide a new strategy for preparing polymers with different self-healing capabilities.
研究领域:
材料科学
·
高分子化学
·
绿色化学
·
机械工程
✓ 已验证
产品关联
DOI
高影响因子
Polymers
·
2023
·Vol. 15
·期 16
·3486
·
IF 5
Pengzhi Bi,Xiuzhong Zhu,Jinbang Han,Li Tian,Wanbin Zhang
In this paper, the effects of HTPBs with different main-chain microstructures on their triblock copolymers and polyurethane properties were investigated. Three polyether-modified HTPB triblock copolymers were successfully synthesized via a cationic ring-opening copolymerization reaction using three HTPBs with different microstructures prepared via three different polymerization methods as the macromolecular chain transfer agents and tetrahydrofuran (THF) and propylene oxide (PO) as the copolymerization monomers. Finally, the corresponding polyurethane elastomers were prepared using the three triblock copolymers as soft segments and toluene diisocyanate (TDI) as hard segments. The results of an analysis of the triblock copolymers showed that the triblock copolymers had lower viscosity and glass transition temperature (Tg) values as the HTPB 1,2 structure content decreased, although the effect on the thermal decomposition temperature was not significant. An analysis of the polyurethane elastomers revealed that as the content of the 1,2 structure in HTPB increased, its corresponding polyurethane elastomers showed a gradual increase in breaking strength and a gradual decrease in elongation at break. In addition, PU-1 had stronger crystallization properties compared to PU-2 and PU-3. However, the differences in the microstructures of the HTPBs did not seem to have much effect on the surface properties of the polyurethane elastomers.
研究领域:
材料科学
·
高分子化学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
FOOD CHEMISTRY
·
2021
·
IF 7.514
Yungang Cao,Baoling Li,Xin Fan,Jiankang Wang,Zhenbao Zhu,Junrong Huang,Youling L. Xiong
The influence of combined Lysine (Lys) and transglutaminase (TG) on the conformation and gelling properties of oxidatively damaged myofibrillar protein (MP) was investigated. The addition of Lys (5 mM) significantly increased the α-helix content (by 47.8%) and decreased the particle size of oxidatively damaged MP, and improved the cooking yield (by 16.8%) and the breaking strength of MP gels (by 65.5%). The treatment with TG (E:S = 1:500) led to a slightly reduced α-helix content but improved breaking strength (by 41.8%) and cooking loss (by 13.3%) of the gels. Their combination (Lys + TG) showed the greatest and synergistic overall improvement, with the set gel displaying a fine, smooth and compact network structure. Notably, the gelling ability of oxidatively damaged MP upon Lys + TG treatment was significantly stronger than that of non-oxidized MP far exceeding its recovery. Therefore, significantly enhanced gelling properties of oxidatively damaged MP can be attained through the combination Lys and TG.
研究领域:
食品科学
·
蛋白质化学
·
生物技术
✓ 已验证
产品关联
DOI
PubMed
高影响因子
Nature Communications
·
2024
·Vol. 15
·期 1
·1-9
·
IF 14.7
Lu Haojie,Zhang Yong,Zhu Mengjia,Li Shuo,Liang Huarun,Bi Peng,Wang Shuai,Wang Haomin,Gan Linli,Wu Xun-En,Zhang Yingying
Endowing textiles with perceptual function, similar to human skin, is crucial for the development of next-generation smart wearables. To date, the creation of perceptual textiles capable of sensing potential dangers and accurately pinpointing finger touch remains elusive. In this study, we present the design and fabrication of intelligent perceptual textiles capable of electrically responding to external dangers and precisely detecting human touch, based on conductive silk fibroin-based ionic hydrogel (SIH) fibers. These fibers possess excellent fracture strength (55 MPa), extensibility (530%), stable and good conductivity (0.45 S·m –1 ) due to oriented structures and ionic incorporation. We fabricated SIH fiber-based protective textiles that can respond to fire, water, and sharp objects, protecting robots from potential injuries. Additionally, we designed perceptual textiles that can specifically pinpoint finger touch, serving as convenient human-machine interfaces. Our work sheds new light on the design of next-generation smart wearables and the reshaping of human-machine interfaces.
研究领域:
材料科学
·
纺织工程
·
机器人技术
·
人机交互
✓ 已验证
产品关联
DOI
PubMed
高影响因子
iScience
·
2023
·
IF 5.8
Xu Dong,Xiaoshuang Zhou,Lvzhou Li,Xiaoting Cao,Jiawei Xu,Shengping Dai,Yaoyao Jiang,Qingyue Li,Ningyi Yuan,Jianning Ding
Monodomain liquid crystal elastomers (m-LCEs) exhibit large reversible deformations when subjected to light and heat stimuli. Herein, we developed a new method for the large-scale continuous preparation of m-LCE fibers. These m-LCE fibers exhibit a reversible contraction ratio of 55.6%, breaking strength of 162 MPa (withstanding a load of 1 million times its weight), and maximum output power density of 1250 J/kg, surpassing those of previously reported m-LCEs. These excellent mechanical properties are mainly attributed to the formation of a homogeneous molecular network. Furthermore, the fabrication of m-LCEs with permanent plasticity using m-LCEs with impermanent instability without external intervention was realized by the synergistic effects of the self-restraint of mesogens and the prolonged relaxation process of LCEs. The designed LCE fibers, which are similar to biological muscle fibers and can be easily integrated, exhibit broad application prospects in artificial muscles, soft robots, and micromechanical systems.
研究领域:
材料科学
·
机械工程
·
仿生学
✓ 已验证
DOI
PubMed
高影响因子
INDUSTRIAL CROPS AND PRODUCTS
·
2022
·
IF 6.449
Xin Jin,Wennan Li,Shihao Wang,Yuyang Li,Chenghao Yang,Zhou Lu,Chaohong Dong
So as to meet the increasing demand of cotton fabrics in different fire safety scenarios, it is imperative to develop treatment agents with both flame retardant and antibacterial effects. Using linear polysiloxane as raw material, (DMH-BPMS) hydantoin-bromopropylmethylsiloxane was synthesized under mild conditions, which was mixed with ammonium polyphosphate (APP) and sodium alginate and coated on cotton fabrics. The structure of DMH-BPMS was characterized by Fourier transform infrared spectroscopy . The limiting oxygen index (LOI) and the vertical flammability test (VFT) show that the LOI value of DMH-BPMS/APP/Cotton can reach 29.8 %, and the char length was 9.6 cm, when the mass ratio of DMH-BPMS to APP is 3:2. Thermogravimetric analysis showed that DMH-BPMS/APP/Cotton had good thermal stability. Under nitrogen conditions at 750 ℃, the char residue rate is still as high as 38.93 %, which is higher than that (12.76 %) of cotton. Cone calorimetry test showed that the total heat release of DMH-BPMS/APP/Cotton decreased, the CO 2 release decreased, and TSP (total smoke production) decreased by 36 % compared with APP/Cotton. DMH-BPMS/APP/Cotton has an amazing antibacterial effect on Escherichia coli and Staphylococcus aureus , and the antibacterial rate can reach 97.8 % and 99.0 %. The whiteness of DMH-BPMS/APP/Cotton was 14.9 % lower than that of cotton. When the concentration of DMH-BPMS was 450 g/L, the maximum breaking strength of DMH-BPMS/APP/cotton in warp and weft directions increased by 48 % and 55 %.
研究领域:
材料科学
·
纺织工程
·
化学工程
·
高分子科学
✓ 已验证
产品关联
DOI
高影响因子
Science China-Materials
·
2023
·Vol. 66
·期 10
·4054-4061
·
IF 8.1
Teng Peicheng,Wang Zhao,Kang Yu,Zhang Yikai,Wang Shutao
Multilayer elastic printed circuit boards (E-PCBs) have emerged as advanced configurations for integrating electronic components on elastomer substrates. However, weak inter-layer adhesion in elastic substrates can result in deformation-induced cracks and delamination in real-world applications. In this study, we present a novel approach to address this challenge by developing supramolecular sandwiched elastomers with high-adhesion skin and mechanically strong cores. This is achieved by precisely regulating the coordination bonds between different metal ions and the ethylenediamine groups within the aminated polydimethylsiloxane. The resulting sandwiched elastomer exhibits strong adhesion between layers (adhesion strength of 0.80 MPa), breaking strength of 0.81 MPa, Young’s modulus of 0.49 MPa, and maximum strain exceeding 500%. Leveraging these properties, the multilayered configuration of E-PCBs can be efficiently and securely assembled using the designed sandwiched elastomers through a simple layer-mounting method. This study offers a promising avenue for the simple and effective fabrication of mechanically stable multilayer flexible devices, eliminating the need for additional adhesive layers and complex structural constructions.
研究领域:
材料科学
·
电子工程
·
高分子化学
✓ 已验证
DOI
高影响因子
COMPOSITES PART B-ENGINEERING
·
2022
·
IF 11.322
Peng Qi,Yuchun Li,Jun Sun,Xingguo Wang,Kaihao Wang,Dan Meng,Xiaoyu Gu,Hongfei Li,Sheng Zhang
High efficient flame retardant surface treatment through a simple and universal strategy has attracted considerable interest. In this work, polyphosphonamide (PPA) was synthesized via an eco-friendly amine ester exchange reaction, and then the polydopamine-polyphosphonamide (PDA-PPA) coating was constructed by a mussel-inspired phenol-amine co-deposition on the surface of various substrates (cotton, polyethylene terephthalate , poly (lactic acid), polyamide , polypropylene fabrics, and flexible polyurethane foam). It was demonstrated that the PDA-PPA coating significantly improved the flame retardancy of the six substrates. For example, in the case of PDA-PPA coated cotton fabric sample, the limiting oxygen index was increased to 28.3%, the peak of heat release rate and total heat release was decreased by 70.6% and 48.2%, respectively. Especially in the vertical and horizontal burning tests, all PDA-PPA coated samples were self-extinguished and free of molten droplets. It was suggested that the PDA-PPA coating released P-containing radicals to capture active small free radicals and released non-combustible gases to dilute combustible volatiles in the gas phase. In addition, the coating showed excellent intumescent charring ability and promoted the char formation of all substates except polypropylene. Surprisingly, the coating also improved the breaking strength of the PDA-PPA coated fabric and the compressive stress of the PDA-PPA coated foam samples. It was believed that this work provides a scalable and promising strategy for preparing fire safety polymeric materials with a large specific surface area.
研究领域:
材料科学
·
高分子科学
·
消防安全工程
·
表面化学
✓ 已验证
DOI
高影响因子
危险品化学品经营许可证（带存储）