Papers by Author: Yi He Zhang

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Authors: Yi He Zhang, Yau Shan Szeto, Shao Jian Ke, Wei Tan, Li Bing Liao
Abstract: In recent years, chitosan/inorganic composites have attracted increasing attention due to its fascinating properties and potential applications in biodegradable materials, drug release, electrochemical sensor, packaging materials and so on. Chitosan/inorganic composites are expected to be as an effective way to overcome shortcomings of slow flocculating speed of chitosan particles, not good enough to meet those wide range of applications in wasterwater treatment. In this study, novel chitosan/clay/PAC (polyaluminium chloride) composite was prepared, and it was used in treating effluent from dying and finishing process. One set of orthogonal experiments were conducted to optimize the experimental condition, and the results showed that removal of waste dye is affected by the dosage of chitosan, PAC, clay, pH and treatment time. The experiments results indicated that the effluent from dying and finishing process treated by the prepared composites became obviously fade, and its COD (chemical oxygen demand) decreased from original 1398.2mg/L to 197.6mg/L, the removing rate reached 85.9%.
Authors: Pan Hu, Yi He Zhang, Feng Shan Zhou, Yue Wang, Meng Fu, Bao Lin Cui, Xiang Hai Meng
Abstract: A novel anti-caking material (E-Oil) was prepared from waste animal/plant oil and triethanolamine by catalytic synthesis in this study. The E-Oil was analyzed by FTIR and the anti-caking effect of anti-caking materials was described by caking ratio. The FTIR results showed that the reaction product of Waste Animal/Plant Oil and Hydramine was surfactant with anti-caking effect. The anti-caking test results indicated that E-Oil made the caking ratio of compound fertilizer decrease from 39.75% to 16.33%. Taking the cost into consideration, the optimal fraction of E Oil was 5‰ and the caking ratio could reach 16.33%, which could approximately meet the application requirements.
Authors: Pan Hu, Yi He Zhang, Yue Wang, Meng Fu, Feng Shan Zhou
Abstract: A novel anticaking material was prepared from from Bentonite, Biological Carbon and abandoned animal/plant oil in this study. In order to determine the optimal dosage of bentonite, biological carbon and abandoned animal/plant oil, the experiments has been performed systematically. The effect of anticaking materials was described by caking ratio. BAC was prepared by 30g of bentonite, 5g of abandoned animal/plant oil, 2.0g of biological carbon. With dosage of BAC is 10g / 200g (compound fertilizer), In the 30 days storage period, preparation of BAC can achieve the requirement of the anti-caking. However, the anti-caking effect is weaker as the longer storage time and Anti-caking cycle of BAC is shorter.
Authors: Wei Tan, Yi He Zhang, Yau Shan Szeto, Li Bing Liao
Abstract: It was shown that chitosan and hydroxy-aluminum pillared montmorillonites were excellent materials for the removal of dyes and metal ions from effluent of dying and finishing. Chitosan/ hydroxy-aluminum pillared montmorillonite nanocomposites are expected to play a multiplex role in the treating process. In this study, the nanocomposite was prepared by incorporating hydroxy-aluminum pillared montmorillonite into chitosan solution that diluted acetic acid was used as solvent for dissolving the chitosan. The ratio of chitosan to the cationic exchange capacity of the montmorillonite was about 1:1, 2:1, 3:1, 4:1 and 6:1, respectively. The nanocomposites were characterized by XRD (X-ray diffraction), SEM (Scanning Electron Microscopy). The experimental results indicated that the presence of hydroxy-aluminum cation was in favor of the chitosan intercalation and the interlayers of MMT was intercalated with the bilayers of chitosan sheets. and they can be used in absorption of organic and metal ions for dying and finishing effluent.
Authors: An Zhen Zhang, Yi He Zhang
Abstract: Rigid polyurethane foams were excellent thermal insulation materials with widely used, which was highly flammable at the same time. In order to obtain safe application, flame retarded polyurethane foams were needed. In this paper, series flame retarded rigid polyurethane foams were prepared with loading different flame retardants such as ammonium polyphosphate, expandable graphite, red phosphorus, Tri (2-chloroethyl) phosphate and dimethyl methylphosphonate. The effects of flame retardants on the foaming-process and flame retardant property of the rigid polyurethane foams were investigated by otary viscometer and limiting oxygen index. The results showed that the combination of solid and liquid flame retardants was necessary to improve the flame retardant and different flame retardants played synergistic roles in rigid polyurethane foams. The limiting oxygen indexes of the foams could be up to 30wt% and 29.6% with 25wt% solid flame retardants and 10wt% liquid retardants, respectively.
Authors: Yi He Zhang, Jing Xing, Li Yu, Jin Hong Li
Abstract: The geopolymer has been prepared from fly ash, metakaolin and Quartz sand, by using the liquid sodium silicate as structural template and sodium hydroxide solution as activator. The effect of glass fiber on the properties of the geopolymer has been studied.
Authors: Ji Wu Shang, Yi He Zhang, Yu Li, Feng Zhu Lv
Abstract: Materials used for microelectronic devices need to have more multifunctional properties, such as excellent mechanical, thermal, and dielectric properties at the same time. In this paper, copper phthalocyanine/polyimide (CuPc/PI) composite films with high dielectric permittivity (k=9.9 with the volume fraction of CuPc is 28% at 100Hz) and high thermal stability are prepared by an in-situ polymerization process. The composite films show good dielectric properties and is almost independent of frequency in the measured frequency range up to 104 Hz. Notablely, The composites remain stable until the temperature reaches 500oC. In addition, the inclusion of CuPc slow down the composite degradation rate when the temperature is higher than 550oC. The resultant high performance of such polymer composites makes them attractive for technological applications in flexible high-k components.
Authors: H. Zheng, Jun Shi, B.Z. Hu, Yi He Zhang, Shu Ping Liang, Mei Long
Authors: Yi He Zhang, Jin Bo Lu, Hai Tao Huang, Xiang Yang Hao, Helen Lai Wah Chan
Abstract: The carbon fiber (CF) reinforced butadiene rubber (BR) electromagnetic shielding composite has been prepared by mechanical agitation and roll mixing methods. The composites have been characterized and tested. As shown in the experimental results, the mechanical properties was increased with the increase of CF, and the electromagnetic shielding effectiveness (SE) of BR based composite with 15 wt% CF content has been tested, the maximum SE was about 60 dB.
Authors: Xiang Yang Hao, Guo Sheng Gai, Yu Fen Yang, Yi He Zhang, Ce Wen Nan
Abstract: PCS (particle composite system) is a kind of dry coating equipment. The PCS process involves encapsulating UHMWPE (ultra-high molecular polyethylene) particles with a layer of SCB (super conductive carbon black) or ACB (acetylene black), and subsequently compacting these CB-encapsulated UHMWPE powders by compression molding to manufacture conductive polymer composites respectively. Morphologies of these composite particles were investigated by SEM. By SEM, we can see the conductive networks of CB in polymer composites. Coating-molding process with PCS can be used to form network structure in ceramics and metal as well.
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