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Diao, Qi,Li, Xiaoyang,Diao, Mengxiao,Lee, Yong-Ill,Liu, Hong-Guo Elsevier 2018 JOURNAL OF COLLOID AND INTERFACE SCIENCE - Vol.522 No.-
<P><B>Abstract</B></P> <P><B>Hypothesis</B></P> <P>Our previous studies have shown that the metal nanoparticle/polymer composite structures fabricated at the liquid/liquid interface have good reusability but lower catalytic activity for heterogeneous reactions in aqueous solutions. This should be attributed to the poor water wettability and more compact structure of the polymer matrices. Therefore, it should be possible to improve the catalytic activity through designing and fabricating a porous composite structure with good water wettability.</P> <P><B>Experiments</B></P> <P>A modified liquid/liquid interface adsorption and fabrication method was used. An aqueous solution of copper acetate and a chloroform/DMF mixed solution of PS-<I>b</I>-PAA acted as the two phases. Through spontaneous emulsification, self-assembly of the polymer molecules with Cu<SUP>2+</SUP> ions in the droplets, and adsorption of the formed spherical micelles and nanofibers to the planar liquid/liquid interface, a porous composite microstructure was formed.</P> <P><B>Findings</B></P> <P>This structure consisted of nanofiber-connected nanospheres which have a PS core and a PAA corona. Tiny and well-dispersed Cu nanoparticles were embedded in the hydrophilic corona and were adsorbed on the nanofibers surface as well. After physical cross-linking with 1,6-diaminohexane, the composite material exhibited high catalytic activity and good reusability for the reactions in aqueous solutions. For example, the rate constant for the reduction of <I>p</I>-nitroaniline reached 1965 s<SUP>−1</SUP> g<SUP>−1</SUP>.</P> <P><B>Graphical abstract</B></P> <P>Block copolymer/copper composite microstructure with highly heterogeneous catalytic activity was fabricated successfully at the liquid/liquid interface.</P> <P>[DISPLAY OMISSION]</P>
Li-Jun Diao,Kan Dong,Shao-Bo Yin,Jing Tang,Jie Chen 전력전자학회 2016 JOURNAL OF POWER ELECTRONICS Vol.16 No.5
The traction motors in electric multiple unit (EMU) trains are powered by AC-DC-AC converters, and the DC link voltage is generated by single phase PWM converters, with a fluctuation component under twice the frequency of the input catenary AC grid, which causes fluctuations in the motor torque and current. Traditionally, heavy and low-efficiency hardware LC resonant filters parallel in the DC side are adopted to reduce the ripple effect. In this paper, an analytical model of the ripple phenomenon is derived and analyzed in the frequency domain, and a ripple control scheme compensating the slip frequency of rotor vector control systems without a hardware filter is applied to reduce the torque and current ripple amplitude. Then a relatively simple discretization method is chosen to discretize the algorithm with a high discrete accuracy. Simulation and experimental results validate the proposed ripple control strategy.
Numerical simulation of gas-solid flow in the axisymmetric inlets square separator
Diao Yong-Fa,Li Xun,Gu Ping-Dao,Li Hao 한국화학공학회 2009 Korean Journal of Chemical Engineering Vol.26 No.3
Numerical simulation was used to research the two-phase flow in the axisymmetric inlet square separator, including the basic flow characteristics, separation efficiency and comparing the difference between single-inlet and double-inlet separator. The effect of the reflecting cone’s geometrical sizes on pressure loss and efficiency was discussed. And the wall erosion condition because of solid particle impingement was calculated and analyzed. The tangential inlet diffuse square separator using RSM modeling that considers anisotropic situation was researched. The distribution of axial, tangential and radial velocity and the pressure loss calculated were analyzed. The results show that there is the typical double deck flow structure in the separator, the square section influences the tangential velocity in the corner, the pressure distribution divides in the inlet on the reflecting cone, and the pressure loss increases with the increase of inlet velocity.
Diao, Li-Jun,Dong, Kan,Yin, Shao-Bo,Tang, Jing,Chen, Jie The Korean Institute of Power Electronics 2016 JOURNAL OF POWER ELECTRONICS Vol.16 No.5
The traction motors in electric multiple unit (EMU) trains are powered by AC-DC-AC converters, and the DC link voltage is generated by single phase PWM converters, with a fluctuation component under twice the frequency of the input catenary AC grid, which causes fluctuations in the motor torque and current. Traditionally, heavy and low-efficiency hardware LC resonant filters parallel in the DC side are adopted to reduce the ripple effect. In this paper, an analytical model of the ripple phenomenon is derived and analyzed in the frequency domain, and a ripple control scheme compensating the slip frequency of rotor vector control systems without a hardware filter is applied to reduce the torque and current ripple amplitude. Then a relatively simple discretization method is chosen to discretize the algorithm with a high discrete accuracy. Simulation and experimental results validate the proposed ripple control strategy.
Yun-Li Cao,Lei Wang,Li-Long Zhou,Bao-Hua Xu,Yan-Yan Diao,Suojiang Zhang 한국공업화학회 2018 Journal of Industrial and Engineering Chemistry Vol.65 No.-
A novel type of heteropolyacids, CTAB-CsH3PMo11VO40 (CTA-CsPAV), was developed by a method of emulsion synthesis using cetyltrimethyl ammonium bromide (CTAB) as the structure promoter, which was applied as a catalyst in the oxidation of methacrolein (MAL) to methacrylic acid (MAA) with fixed-bed reactor. The structure and property of CTA-CsPAV were characterized by FT-IR, XRD, nitrogen adsorption-desorption, NH3-TPD, SEM, XPS, and so on. The structure-performance relationship of CTA-CsPAV was systematically studied, wherein the influence of surface area, acidity, redox property of CTA-CsPAV were focused and discussed. Importantly, the long-term performance of CTA-CsPAV was also investigated.
POSS/Polyurethane Hybrids and Nanocomposites: A Review on Preparation, Structure and Performance
( Shuo Diao ),( Li Xin Mao ),( Li Qun Zhang ),( Yi Qing Wang ) 한국고무학회 2015 엘라스토머 및 콤포지트 Vol.50 No.1
Polyhedral oligomeric silsesquioxane (POSS) is an important inorganic-organic hybrid material with a threedimensional structure. Polyurethane (PU) is a widely applied polymer that has versatile properties with the change of two phase structure. When POSS is incorporated into PU by physical or chemical methods, many properties can be greatly improved, such as mechanical properties, thermal stability, biodegradation resistance, and water resistance. This paper reviews the recent progress in preparation, structure, and performance of POSS-modified polyurethane from the viewpoint of physical blending and chemical modification.
Li, H.,Diao, Q.Y.,Zhang, N.F.,Fan, Z.Y. Asian Australasian Association of Animal Productio 2008 Animal Bioscience Vol.21 No.8
This study was designed to examine the effects of different dietary protein levels on growth performance, nutrient utilization, amino acid (AA) digestibility and serum biochemical parameters of preruminant dairy calves. Fifteen healthy new-born calves were randomly allotted to three experimental groups and fed with different milk replacer that contained 18% (LP), 22% (MP) or 26% (HP) of protein. The results showed that final BW, net gain and ADG were significantly higher in the MP group than in LP and HP groups (p<0.05). In addition, the apparent digestibility of CP in the MP group was significantly higher than in the other two groups (p<0.05). The values of N intake and fecal N excretion were significantly increased following the increase of dietary protein content (p<0.05). However, in all three groups of animals, dietary protein content had no significant effect on urinary N concentration (p>0.05). BUN concentration, on the other hand, decreased as calves grew but increased following the increase of dietary CP content. Furthermore, no significant differences in digestibility of amino acids were observed among these three groups of animals (p>0.05). We concluded that calves fed with milk replacer containing 22% of protein had better growth performance and nutrient utilization as compared to animals treated with milk replacer containing either 18% or 26% of protein.
Screening for Metastatic Osteosarcoma Biomarkers with a DNA Microarray
Diao, Chun-Yu,Guo, Hong-Bing,Ouyang, Yu-Rong,Zhang, Han-Cong,Liu, Li-Hong,Bu, Jie,Wang, Zhi-Hua,Xiao, Tao Asian Pacific Journal of Cancer Prevention 2014 Asian Pacific journal of cancer prevention Vol.15 No.4
Objective: The aim of this study was to screen for possible biomarkers of metastatic osteosarcoma (OS) using a DNA microarray. Methods: We downloaded the gene expression profile GSE49003 from Gene Expression Omnibus database, which included 6 gene chips from metastatic and 6 from non-metastatic OS patients. The R package was used to screen and identify differentially expressed genes (DEGs) between metastatic and non-metastatic OS patients. Then we compared the expression of DEGs in the two groups and sub-grouped into up-regulated and down-regulated, followed by functional enrichment analysis using the DAVID system. Subsequently, we constructed an miRNA-DEG regulatory network with the help of WebGestalt software. Results: A total of 323 DEGs, including 134 up-regulated and 189 down-regulated, were screened out. The up-regulated DEGs were enriched in 14 subcategories and most significantly in cytoskeleton organization, while the down-regulated DEGs were prevalent in 13 subcategories, especially wound healing. In addition, we identified two important miRNAs (miR-202 and miR-9) pivotal for OS metastasis, and their relevant genes, CALD1 and STX1A. Conclusions: MiR-202 and miR-9 are potential key factors affecting the metastasis of OS and CALD1 and STX1A may be possible targets beneficial for the treatment of metastatic OS. However, further experimental studies are needed to confirm our results.
Lin Li,Panpan Duan,Qingbo Xu,XuJun Zhang,JiaNing Chen,Feiya Fu,HongYan Diao,Xiangdong Liu 한국섬유공학회 2020 Fibers and polymers Vol.21 No.9
Aiming to a durably antibacterial function, stable immobilization of silver nanoparticles (Ag NPs) on cottontextiles still represents challenging in textile industry. In the present work, by grafting oligomeric polyacrylic acid (PAA) ontocotton fiber surfaces, we effectively prepared the Ag NPs with controllable size on the fiber surface, which are of average sizeof 16.43 nm, and therefore achieved a desirable antibacterial durability. The oligomer PAA binder can give the modifiedfabrics with a remarkable antibacterial durability against washing, as the bacterial reduction rates against bothStaphylococcus aureus and Escherichia coli remained over 90 % even after 50 laundering cycles. Moreover, this graft toapproach using oligomeric PAA shows merits in maintaining the desired cotton properties such as flexibility, waterabsorptivity and vapor permeability. Finally, this finishing process ensures a reliable safety for human skin.