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RISS 인기검색어
- 검색키워드
- 저자 : Zitian Li (검색결과 5 건)
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Xinyang Li,Ligang Lin,Zitian Li,Jing Yang,Wensong Ma,Xu Yang,Xiaopeng Li,Chunhong Wang,Qingping Xin,Kongyin Zhao 한국공업화학회 2023 Journal of Industrial and Engineering Chemistry Vol.119 No.-
In this study, inspired by ‘‘micro-explosion” strategies, a separation membrane with high porosity andpermeability, and highly efficient separation performance was prepared. With the use of polyvinylidenefluoride (Solvay6015) as membrane material, azodicarbonamide (AC) as an ‘‘explosion center point” tothe casting membrane solution, and NaOH as an ‘‘external stimulus” in the coagulation bath, the twochemicals undergo in-situ foaming reaction to form a loose nanofiltration membrane. FTIR, XPS, andTGA results demonstrated that the decomposition of AC was complete, which produced gases thatincreased the porosity of the membrane. The optimized membrane has a higher flux(101.72 L m2 h1 at 0.3 Mpa), higher negative surface charge, and better mechanical properties underthe premise of separating CR/NaCl. In the separation of pollutants with different molecular weights,the permeation flux of the optimized membrane increased by more than double. This foaming technologywas also applied to another membrane material, ethylene vinyl alcohol, from which we found that themembrane also had higher porosity and better permeability. Together, this paper presents an in-situfoaming method for preparing separation membranes and lays the foundation for solving the trade-offbetween membrane permeability and rejection in dye/salt separation.
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Wenming Jiang,Guangyu Li,Feng Guan,Junwen Zhu,Dongping Zhang,Zitian Fan 대한금속·재료학회 2022 METALS AND MATERIALS International Vol.28 No.4
A novel method named lost foam casting (LFC) process combined with layered extrusion forming (LEF) technology wasproposed to prepare the Al2O3/AZ91D Mg interpenetrating composites, and the microstructural characteristics, thermalexpansion performance and wear resistance of the Al2O3/AZ91D interpenetrating composites were investigated in this work. The results indicated that a superior bonding between AZ91D magnesium alloy and Al2O3porous ceramic was achieved. The Al2O3/AZ91D interpenetrating composites exhibited obvious improvements in the thermal expansion performance andthe wear resistance compared to the AZ91D alloy. Therefore, the LFC process combined with the LEF technology providesa promising method for the preparation of the Al2O3/AZ91D interpenetrating composites.
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Wenming Jiang,Haixiao Jiang,Guangyu Li,Feng Guan,Junwen Zhu,Zitian Fan 대한금속·재료학회 2021 METALS AND MATERIALS International Vol.27 No.8
In this work, microstructure, mechanical properties and fracture behavior of the magnesium/steel bimetal using compoundcasting assisted with hot-dip aluminizing were investigated, and the interface bonding mechanism of the magnesium/steelbimetal were also analyzed. The results indicate that the magnesium/steel bimetal obtained without hot-dip aluminizing hadlarger gaps through the whole interface without reaction layers between magnesium and steel, leading to a poor mechanicalbonding. After the steel substrate was hot-dip aluminized, an intermetallic layer along with an Al topcoat layer wereformed on the surface of the steel substrate, and the intermetallic layer was constituted by Fe2Al5,τ10-Al9Fe4Si3, FeAl3andτ6-Al4.5FeSi phases. In the case of the magnesium/steel bimetal obtained with hot-dip aluminizing, a compact and uniforminterface layer with an average thickness of about 17 μm that consisted of Fe2Al5,τ10-Al9Fe4Si3, FeAl3and Al12Mg17intermetalliccompounds was formed between the magnesium and the steel, obtaining a superior metallurgical bonding. The interfacelayer had much higher nano-hardnesses compared to the magnesium and steel matrixes, and its average nano-hardness wasup to 11.1 GPa, while there were respectively 1.1 and 4.2 GPa for the magnesium and steel matrixes. The shear strength ofthe magnesium/steel bimetal with hot-dip aluminizing reached to 23.3 MPa, which increased by 8.59 times than that of thecomposites without hot-dip aluminizing. The fracture of the magnesium/steel bimetal with hot-dip aluminizing representeda brittle fracture nature, initiating from the interface layer.
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Wensong Ma,Ligang Lin,Jing Yang,Zitian Liu,Xinyang Li,Meina Xu,Xiaopeng Li,Chunhong Wang,Qingping Xin,Kongyin Zhao 한국공업화학회 2023 Journal of Industrial and Engineering Chemistry Vol.120 No.-
Nowadays, the use of separation membranes to deal with oil–water emulsions has gained popularity. However, oil fouling of membrane surfaces during the separation of oil–water emulsion is still a significantchallenge. In this study, inspired by the biological coral stone structure, the gel layer was firmlyattached to the surface of membrane using a simple co-blending and cross-linking strategy. A superwettingmembrane (PVDF/CD-SA) with a coral stone structure was obtained. The PVDF/CD-SA membranehad a high permeate flux that was 4.2 times higher than that of the original membrane and a high separationefficiency of about 99.2 % for the separation of oil–water emulsion. Furthermore, the membranehad outstanding chemical stability. The fluxes of several different oil-in-water emulsions significantlyimproved, and the separation efficiencies were as high as 98 %. Moreover, the separation efficienciesand contact angles of the membrane remained unchanged after numerous cycles of use. The membraneexhibited excellent superhydrophilicity in air (instantaneous water wetting in air) and superoleophobicityunder water (underwater oil contact angle > 156). Most importantly, the oil was able to automaticallydetach from the surface of membrane, resulting in self-cleaning performance. Therefore, this PVDF/CD-SAmembrane eliminated the problem of oil adhesion, exhibiting excellent potential for practical applicationsin oil–water separation.
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Rapid recycling of waste salt core materials in foundry industry using fractional crystallization
Xiaolong Gong,Xiongjie Xiao,Qianqian Li,Jianwei Zhao,Zitian Fan 한국공업화학회 2023 Journal of Industrial and Engineering Chemistry Vol.124 No.-
The water-soluble composite salt core materials have attracted increasing interest in the manufacture ofhollow castings with complex structures due to their high strength and excellent water solubility, whilethe treatment of waste brine generated from the salt core represents a major pain point for its large-scaleapplication. To change the above situation, the recycling technology of the waste brine from compositesalt core materials was developed using cooling crystallization combined with solvent-driven crystallization. The influences of dissolution temperature and solvent content on the recovery rate of the compositesalt core materials, including inorganic salt and fortifier, were investigated. In addition, the mechanicalproperties and microstructures of the composite salt core with multiple cycles were compared and analyzed. The results show that the fortifier material of corundum powder exhibits excellent chemical andthermal stability with a 100% recovery rate, and the recovery rate of inorganic salt material can reach79.31% with a 40 C dissolution temperature and a 1.0 mass ratio of methanol to brine. The microstructures,phase compositions and mechanical properties of the multi-recycled composite salt core have notchanged, demonstrating that the recycling of the water-soluble composite salt core is feasible, and favoringthe green development of the foundry industry.
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