TRANSACTIONS OF NONFERROUS METALS SOCIETY OF CHINA
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2019
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IF 2.338
Li-ping RAN,Fei RAO,Ke PENG,Huan YIN,Mao-zhong YI
Ultrahigh-temperature ceramics were added to C/C composites to meet their application requirement in a high-temperature oxidizing environment. C/C−ZrB 2 −SiC composites were fabricated by high-solid-loading slurry impregnation with polymer infiltration and pyrolysis. The dispersion and rheological behavior of ZrB 2 slurry and the microstructural, mechanical, and ablation properties of the C/C−ZrB 2 −SiC composites were investigated. Results indicated that a well-dispersed and low-viscosity ZrB 2 slurry was obtained using 0.40 wt.% polyethyleneimine as a dispersant at pH 5. Ceramics were uniformly distributed in the short-cut fiber layer and needle-punched area. The flexural strength of the C/C−ZrB 2 −SiC composites was 309.30 MPa. The composites exhibited satisfactory ablation resistance under the oxyacetylene flame of 2500 °C, and the mass and linear ablation rates were 0.40 mg/s and 0.91 μm/s, respectively. A continuous and compact ZrO 2 layer, which could effectively reduce the diffusion rate of oxygen and protect the composites from being ablated, was formed.
研究领域:
材料科学
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航空航天工程
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DOI
高影响因子
Scientific Reports
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2017
·Vol. 7
·期 1
·1-10
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IF 4.259
Zhu Xiaodong,Liu Yu,Dong Ningwen,Li Zhao
Leuco dyes are widely used as functional materials for their thermosensitive chromogenic nature. The influences of thermochromic compounds and impregnation processing conditions on thermochromic wood veneer properties were investigated in this paper. The thermochromic compounds included thermochromic dye (ODB-2), color developer (bisphenol A) and solvent (1-tetradecanol). To achieve the maximum color change, the optimum mixing ratio of ODB-2 to bisphenol A to 1-tetradecanol was 1:2:60. Juglans mandshurica veneers were ultrasonically impregnated with reversible thermochromic compound suspensions. Analysis of variance showed that the influences of impregnation parameters on veneer color change were significant at the 0.05 level. The optimum thermochromic wood veneer can be obtained by impregnating with a thermochromic compound suspension for 2.0 min at 65 °C. In this paper, the thermochromic properties of wood veneers were evaluated, and functional thermochromic veneers exhibited excellent properties and thermostability.
研究领域:
材料科学
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林产化学加工工程
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DOI
PubMed
高影响因子
International Journal of Applied Ceramic Technology
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2022
·Vol. 19
·期 4
·1970-1980
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IF 2.328
Hao Li,Fucai Yang,Bo-xing Zhang,Ying Guo,Weijian Han,Tong Zhao,Wenfeng Qiu
In this work, the Nextel 720 continuous fiber reinforced alumina ceramic matrix composites (CMCs) were prepared by an improved prepreg process. The alumina matrix was derived from aqueous slurry, which consisted of organic glue, alumina sol, nanometer alumina powders, and micrometer alumina powders. This design provided a densely packed matrix for the CMC, and made the whole process relatively simple. The ratio of different alumina components in aqueous slurry was optimized to obtain good sintering activity, high thermal resistance, and excellent mechanical properties simultaneously. Furthermore, a preceramic polymer of mullite was used to strengthen the ceramic matrix through a multiple infiltration process. The final CMC sample achieved a high flexural strength of 255 MPa and a good high-temperature stability. After 24 h of heat treatment at 1100°C, 85% of the maximum flexural strength still had been retained.
研究领域:
材料科学
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陶瓷工程
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DOI
高影响因子
CHEMICAL ENGINEERING JOURNAL
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2020
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IF 10.652
Binrui Wu,Jiajie Lyu,Chaoyi Peng,Dazhi Jiang,Jun Yang,Jinshui Yang,Suli Xing,Liping Sheng
Poor mechanical durability still hinders artificial superhydrophobic coatings from practical application, although these coatings were created years ago and still attract wide research interest. Previous epoxy/nanoparticle works seem to encounter a dilemma: a delicate nanostructure and low surface energy without a proper and strong microstructure to provide protection and strength naturally leads to weak mechanical adhesion and poor wear robustness. Herein, we develop an inverse infusion process (IIP) to construct hierarchical structures via newly synthesized hydrophobic and tough epoxy resin as well as rationally selected alumina nanoparticles (NPs). The IIP process forms an uncured epoxy layer first on the substrate and a preliminary nanocomposite coating next using an air spraying method, after which the epoxy layer inversely infuses into the micro/nanostructure and constructs a tougher microstructure on the top as well as a continuous nanocomposite layer throughout the coating after curing. This results in superhydrophobic coatings on a substrate with excellent adhesion and mechanical robustness, and our coatings can tolerate 600 cycles of tape peeling tests (with 3 M high-tack tape), 20 m sandpaper abrasion (with a pressure of ~5 kPa and 80 grit sandpaper), 115 cycles of Taber abrasion (with 250 g load), and 600 g of sand impact from a height of 110 cm, which are the highest values achieved by superhydrophobic coatings to the best of our knowledge. Furthermore, our coatings sustained highly corrosive media, such as sodium hydroxide and hydrochloric acid solutions. A combination of the established IIP process and the rationally selected ingredients dramatically enhanced the mechanical durability of the superhydrophobic coatings, and these attractive materials may attract attention for self-cleaning, anti-icing, and anti-fouling applications in industry.
研究领域:
材料科学
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表面工程
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DOI
高影响因子
Coatings
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2020
·Vol. 10
·期 10
·969
·
IF 2.436
Xue Dong,Tieling Xing,Guoqiang Chen
Pilling is a common and unresolved problem in knitted fabrics, especially for the cellulose fiber blended fabrics, which not only causes an unattractive appearance and an uncomfortable handle, but also reduces the added value of the products. In this study, four different kinds of knitted fabrics were treated with 2,4,6-trichloropyrimidine (TLP) alkaline emulsion by dipping and pad–dry–cure modification processes. The surface morphology and chemical structure of original and treated fabrics were characterized by scanning electron microscopy (SEM), Fourier transform infrared spectroscopy (FTIR) and X-ray diffraction (XRD). The anti-pilling performance, thermal properties, physical and mechanical properties and color features of treated fabrics were also evaluated. The results indicated that TLP was successfully covalently crosslinked onto the surface of the cellulose fibers. The dipping process resulted in a better anti-pilling property than that of the pad–dry–cure process, and both treatments could bring about an excellent anti-pilling property and outstanding laundering durability. A pilling grade of 4.5 was achieved for the treated polyester/viscose (T/V) fabric with the dipping process even after 20 washing cycles. In addition, the treated fabrics displayed an enhanced antistatic property and still maintained a soft handle. Besides, the bursting strength and air permeability of treated samples were found to have a slight deterioration, while no apparent differences were found in the color parameters and colorfastness of dyed fabrics. The above results demonstrate that 2,4,6-trichloropyrimidine has the potential application prospect in the functional finishing and home-caring of textiles.Keywords:2,4,6-trichloropyrimidine;anti-pilling;cellulose fiber blended fabrics;dipping process;pad–dry–cure process
研究领域:
纺织科学与工程
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材料化学
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DOI
高影响因子
TEXTILE RESEARCH JOURNAL
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2025
·
IF 1.9
Yunlong Zhu,Fang Sun
In the context of the global pandemic, the demand for antimicrobial and antiviral functional textiles has risen sharply, driving the pursuit of more efficient and durable surface modification strategies. In this study, we propose a simple and effective two-step impregnation method to simultaneously enhance the antibacterial and antiviral properties of cotton fabrics. Specifically, methyl thioglycolate (METG) was first covalently grafted onto a cotton fiber surface, followed by stable immobilization of Cu(II) ions through coordination with the introduced thiol groups. The resulting fabric exhibited outstanding antimicrobial and antiviral performance, achieving a 99.99% bacterial reduction rate (BR) against both Escherichia coli and Streptococcus aureus within 20 minutes (AATCC 100-2012 Test Standard), and a 99.99% virus inactivation rate (VR) against bacteriophage Phi-x174 within 5 minutes (YY/T 1497-2016 Test Standard). Notably, the modified fabric maintained excellent antimicrobial and antiviral performance even after 400 abrasion cycles or 50 washing cycles. Moreover, the intrinsic properties of the modified cotton fabric (including water vapor permeability, tensile strength, water absorption, droplet diffusion area, and softness) remained essentially unchanged, ensuring comfort and wearability. This method offers several advantages: it is easy to operate, cost-effective, environmentally friendly, and well-aligned with the principles of sustainable development. Additionally, it provides a promising platform for developing high-performance antimicrobial and antiviral textiles, especially for use in healthcare and personal protection.
研究领域:
纺织科学
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材料科学
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纳米技术
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表面工程
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生物技术
·
化学工程
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DOI
高影响因子
危险品化学品经营许可证（带存储）