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- 저자 : Zhongxu Yu (검색결과 4 건)
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Zhongxu Lian,Jinkai Xu,Peng Yu,Zhanjiang Yu,Zuobin Wang,Huadong Yu 대한금속·재료학회 2020 METALS AND MATERIALS International Vol.26 No.11
As two typical special wettability materials, superhydrophobic and superoleophobic surfaces are the most widely studiedinterfaces because of their excellent water-or oil-repellent ability. However, how to use a simple strategy to obtain thosesurfaces is still a huge challenge. On the other hand, corrosion tend to occur while using metallic materials, resulting in poorperformance of metallic equipment and even serious safety hazards. In this work, a one-step strategy of nanosecond laserablation was presented to construct the microstructures acquired by superhydrophobic and superoleophobic aluminum alloysurfaces. The superhydrophobic and superoleophobic properties of microstructured surfaces were obtained via high temperatureand fluorosilane treatments on laser-processed surfaces, respectively, and the oil-repellent and corrosion resistanceproperties of both substrates were studied. The potentiodynamic polarization test shows that the superoleophobic surfacehad a better corrosion resistance than the superhydrophobic surface, which will provide an effective protection for the barealuminum alloy. Meanwhile, the superoleophobic surface had good chemical stability. It is believed that the nanosecond lasertechnology can offer an effective strategy for constructing the microstructures acquired by large-area superhydrophobic andsuperoleophobic surfaces on aluminum alloy materials.
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Zhongxu Lian,Yi Cheng,Jinkai Xu,Jinlong Xu,Wanfei Ren,Yanling Tian,Huadong Yu 한국정밀공학회 2023 International Journal of Precision Engineering and Vol.10 No.5
In this work, we present a simple technique for green fabrication of slippery liquid-infused surface (SLIS) with anti-friction property on various metallic substrates using wire electrical discharge machining. Micro-crater structures were successfully obtained, and the surface had excellent liquid-repellent property after modification and infusion of silicone oil. A wide range of liquids including water, juice, coffee, tea, vinegar, albumin, glycerol, and ketchup could easily slid down the surface tilted at an angle of 10° without leaving any trace. The influences of the number of cutting step on the morphology and wettability of the surface were studied comprehensively. Further, the tribological properties of the surface were analyzed and the results showed that the SLIS had a decrease of 73.2% in friction coefficient as compared to that of the smooth surface. By studying the morphology of the worn surfaces, it is found that the SLIS had slight abrasive wear behavior. To demonstrate the precision processing ability of this technology, we fabricated slippery sub-millimeter-scale asymmetric bump arrays, and the experiment results showed that the asymmetric bump arrays had excellent water harvesting ability at low temperatures. This kind of environment-friendly precision machining technology will promote the practical applications of metallic functional materials.
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Wenjun Zhu,Chengyue Yang,Zhongxu Yu,Junhua Xiao,Yude Xu 대한토목학회 2023 KSCE Journal of Civil Engineering Vol.27 No.6
This paper presents the corrosion-induced cracking performance of reinforced concrete in a chloride condition. The meso-scale structures of concrete specimens were studied according to the X-ray micro-computed tomography test, including the corrosion propagation, the accumulation and transportation of corrosion products, the defects and cracking behaviors of concrete cover. The experimental results show that the defects could provide a reasonable space for the accommodation of corrosion products, which could significantly increase the corrosion process and postpone the cracking performance. The propagation of the cracking path initiating from the corrosion area of the reinforcement to the concrete cover was also captured based on the experimental images, which can make contribution to the recognition of corrosion-induced cracking behavior of the concrete cover.
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Tian Ai,Chunmei Xu,Lei Zhang,Ke Chen,Yonggui Wu,Shujuan Dai,Xiaolu Xiong,Shixin Jie,Xiaoni Jin,Zhongxu Yu 한국화학공학회 2022 Korean Journal of Chemical Engineering Vol.39 No.9
Novel efficient biochar of Goldenberry peels (GBPMW-H3PO4) was prepared through a microwave-assistedphosphoric acid activation method. It was characterized and used for removing two beta-lactamase inhibitors, sulbactam(SAM, first listed in Japan in 1986) and avibactam (AVI, first listed in the U.S. in 2015), from aqueous solution. Characterization confirmed that GBPMW-H3PO4 displayed a high surface area (720.046m2 g1), more abundant porestructure, smaller particle size, and higher thermal stability. The experimental results showed that the adsorption of thetwo antibiotics was a spontaneous, favorable, and endothermic process, highly dependent on solution pH. A contacttime of 60 min assured equilibrium, and GBPMW-H3PO4 followed pseudo-first-order kinetics (R2=0.9950-0.9977). Furthermore,the adsorption capacities of GBPMW-H3PO4 for SAM and AVI were 211.86 and 198.81mg g1, respectively,and the performance was better than that of unmodified biochar. Microscopically, the main mechanism could beexplained by - electron donor-acceptor interaction, hydrogen bonding interaction, -hydrogen bonding, hydrophobicinteraction, and electrostatic interaction. The study demonstrates that the microwave-assisted H3PO4 activationmethod could produce biochar, and GBPMW-H3PO4 was confirmed to be a low-cost and high-efficiency adsorbent forremoving beta-lactamase inhibitors from medical wastewater.
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