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Low-Temperature Synthesis of Highly Efficient, Deep-Red Zn-Cu-In-Se/ZnSe Fluorescence Quantum Dots
Juan Yang,Jingling Li,Yanqing Zhu,Xueqing Xu,Xiudi Xiao,Bing Deng,Kaili Qin,Zhuoneng Bi,Shuaijun Chen,Gang Xu 성균관대학교(자연과학캠퍼스) 성균나노과학기술원 2019 NANO Vol.14 No.6
We report a facile synthesis method on CuInSe2 (CISe)-based quantum dots (QDs) by using tri-n-octylphosphine selenium (TOPSe) as selenide precursor, with assistance of oleylamine (OAm) and n-dodecanethiol (DDT). We demonstrate that the OAm and DDT jointly contribute to the formation of the low-temperature-decomposable metal-sulfide clusters, and promote the QD nucleation at relatively low temperature range of 180–200 ℃. Furthermore, to improve fluorescence property, Zn-doping and ZnSe coating are simultaneously carried out. The obtained deep-red ZnCISe/ZnSe QDs possess higher quantum yield of 65% at wavelength of 670 nm, which is in the best performance range ever reported. Then, we investigate the improvement mechanism, where the sufficient Zn replacement of In sites is the crucial factor. This modified core–shell structure provides two benefits, on the one hand, the enhancement on intrinsic defect-related recombination, and the other hand, the improved core–shell interface that reduces the nonradiative recombination.
Effect of geometric parameters of liquid-gas separator units on phase separation performance
Songping Mo,Xueqing Chen,Ying Chen,Zhen Yang 한국화학공학회 2015 Korean Journal of Chemical Engineering Vol.32 No.7
Five liquid-gas separator units were designed and constructed based on a new concept of a validated highperformance condenser. Each separator unit consiss of two united T-junctions and an apertured baffle. The separator units have different header diameters or different baffles with different diameters of the liquid-gas separation hole. The phase separation characteristics of the units were investigated at inlet air superficial velocities from 1.0m/s to 33.0m/s and water superficial velocities from 0.0015 m/s to 0.50 m/s. The experimental results showed that the liquid height, liquid flow rate through the separation hole, and liquid separation efficiency increased with increased header diameter and decreased diameter of the separation hole. The geometric structures of the separator units affected the phase separation characteristics by influencing the liquid height in the header and the liquid flow rate through the separation hole.
Jieguang Song,Xueqing Yang,Ping Chen,Hao Xu,Deping Luo,Rongjin Liu,Zhijun Lai 한양대학교 세라믹연구소 2022 Journal of Ceramic Processing Research Vol.23 No.4
The prepared permeable bricks using electric porcelain waste as the main raw material are investigated, which improves theutilization rate of electric porcelain waste, and realizes the organic unity of recycling resource and ecological environmentprotection. The effects of different raw material ratios on the permeability coefficient, apparent porosity, compressive strength,volume shrinkage rate and microstructure properties of electric porcelain waste permeable bricks are investigated. The electricporcelain waste with a ratio of over 85 wt.% have greatly improved the utilization rate of electric porcelain waste. The resultsare shown that the water-to-material ratio or foaming agent content are increased, the porosity and water permeability of theelectric porcelain waste permeable brick are increased, but the compressive strength of the electric porcelain waste permeablebrick is decreased. The 90 wt.% electric porcelain waste, the 3 wt.% kaolin, the 5 wt.% sintering aid, and the 2 wt.% foamingagents are optimum raw materials ratios, the water-to-material ratio for 0.9 and the drying temperature at 40 oC, the sinteringtemperature at 1200 oC and holding time for 1 h are obtained the excellent performance electric porcelain waste permeablebricks. The permeability coefficient is 3.9×10−2 cm/s, the volume shrinkage rate is 37.88%, the compressive strength is 1.146MPa, and the porosity is 79.0%.
The technology and properties of sponge city permeable bricks prepared using refractory waste
Jieguang Song,Xueqing Yang,Ping Chen,Rongjin Liu,Deping Luo,Yuxuan Wei,Wenjin Yao,Jingjing Liu,Qing Zeng 한양대학교 세라믹연구소 2021 Journal of Ceramic Processing Research Vol.22 No.4
With the widespread development of sponge city projects across the country, the use of industrial permeable bricks hasincreased dramatically. My country produces a large amount of refractory waste and pollutes the environment seriously. Wasterefractory insulation bricks are used as the main raw materials, and a small amount of auxiliary raw materials are added toprepare sponge urban permeable bricks through forming and sintering processes. Through performance tests, such asporosity, flexural strength, and water permeability coefficient, the effect of process parameters on the performance ofpermeable bricks is studied, the process parameters of using refractory waste are comprehensively optimized to preparesponge urban permeable bricks, and permeable bricks are prepared for the industrialization of high-quality industrial solidwaste. Brick provides reference. Through the experimental results and analysis, the following conclusions are drawn: the rawmaterial ratio of refractory brick waste: binder: foaming agent: sintering aid is 80:10:1:9. Slurry water mill foaming occurswhen the water to material ratio is 0.5, the ball milling speed is 80 r/min, and the ball milling time is 2 h; the foaming effectand molding performance are better. In the drying stage, drying at 45 oC for 12 h has the best molding effect. The sinteringsystem at 1,300 oC and holding time of 1 h has the best sintering performance. After optimizing the process, the porosity ofthe permeable bricks can reach 48.4%, the water permeability coefficient is 2.1×10^-2 cm/s, the national permeable brick hasA-level standard, and the compressive strength is 26.8 MPa.
Yue Liu,Xueqing Yang,Kangliang Peng,Qiong Wang,Jianzhen Huang,Zilin Zhang,Jiang Lu,Hao Xu,Jieguang Song,Lin Chen 한양대학교 세라믹연구소 2019 Journal of Ceramic Processing Research Vol.20 No.4
Yttrium aluminum garnet (YAG), which possesses excellent properties, is investigated and applied. The sintering technology of YAG porous ceramics is optimized. Results show that the porosity initially increases and then decreases with an increase of increasing temperature rate, the porosity are decreased with an increase of removing carbon temperature, the porosity are decreased with an increase of sintering temperature, the porosity are decreased with an increase of holding time. Meanwhile, the compressive strength constantly exhibits an opposite tendency. The optimization of the sintering technology of YAG porous ceramics is based on porosity and compressive strength. A good sintering technology are an increasing temperature rate of 8 oC/min, a removing carbon temperature of 800 oC, removing carbon time of 1 h, a sintering temperature of 1450 oC and holding time of 2 h. The porosity of the prepared YAG porous ceramics is 57.4%, and the compressive strength is 8.89 MPa.
Binpeng Zhang,Dongjie Yang,Xueqing Qiu,Yong Qian,Mengzhen Yan,Qiong Li 한국공업화학회 2020 Journal of Industrial and Engineering Chemistry Vol.82 No.-
In this work, lignin-derived porous carbon was prepared using alkali lignin (AL) or lignosulfonic acid (LS)as a precursor to reveal the activation effects of potassium compound (KHCO3, K2CO3 and KOH) ontechnical lignin with different degree of aggregation. Quartz crystal microbalance with dissipation andatomic force microscope testing results showed that KHCO3 had the best activation effect on AL having ahighly aggregated and dense microstructure, thanks to the expansion effect from KHCO3. LS has a highlydispersed and loose microstructure, and KOH had the best activation effect on LS. This is because thestabilizing effect from KOH could avoid excessive destruction of pore structure during carbonization andactivation process. Therefore, the specific surface area of AL-derived porous carbon obtained with KHCO3and LS-derived porous carbon obtained with KOH could reach 2084 and 2770 m2 g 1, while theabsorption capacity could reach 701 and 870 mg g 1 for sulfamethazine respectively. Our result providesa theoretical base for preparing high quality lignin-derived porous carbon adsorbent with different kindsof technical lignin
Investigation of grafted sulfonated alkali lignin polymer as dispersant in coal-water slurry
Yanlin Qin,Dongjie Yang,Wenyuan Guo,Xueqing Qiu 한국공업화학회 2015 Journal of Industrial and Engineering Chemistry Vol.27 No.-
A novel grafted sulfonated alkali lignin polymers (GSAL) with hydrophilic side chain and differentmolecular weights prepared were used as dispersants for coal-water slurry (CWS). The viscosityreduction for CWS had been attributed primarily to the diminution of coal particles (adsorbed GSAL)interaction of steric electrostatic repulsion and dramatic wettability. The adsorption amount of GSAL-3can reach to 1.58 mg/g, and the isotherm of GSAL on coal surface belongs to the Langmuir model, theelectrostatic self-assembly result indicated the dominant driving force of GSAL absorbed on coal surfacewas the p–p interaction. GSAL was superior in reducing the viscosities of CWS.
( Xiaojing Fan ),( Ruixian Yang ),( Sixin Qiu ),( Xueqing Cai ),( Huasong Zou ),( Fangping Hu ) 한국미생물 · 생명공학회 2016 Journal of microbiology and biotechnology Vol.26 No.5
The eglS gene in Bacillus amyloliquefaciens encodes an endo-β-1,4-glucanase that belongs to glycosyl hydrolase family 5. In this study, a disruption mutant of gene eglS was constructed to examine its role in bacterial adaptation in plants. The mutant TB2k, eglS gene inactivated bacterial strain, was remarkably impaired in extracellular cellulase activity. When inoculated on Brassica campestris, the TB2k population was reduced by more than 60% compared with the wild-type strain in the root, stem, and leaf tissues. Overexpression of eglS in the wild-type strain increased the bacteria population in the plant tissues. Further studies revealed that the transcription level of eglS was correlated with bacterial population. These data demonstrate that endo-β-1,4-glucanase of B. amyloliquefaciens is required for its optimal endophytic colonization.