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| 1 | Controllable preparation of particles with microfluidics显示文摘This paper reviews recent development and achievements in controllable preparation of nanoparticles, micron spherical and non-spherical particles, using microfluidics. A variety of synthesis strategies are presented and compared, including single-phase and multiphase microflows. The main structures of microfluidic devices and the fundamental principles of microflows for particle preparation are summarized and identifled. The controllability of particle size, size distribution, crystal structure, morphology, physical and chemical properties, is examined in terms of the special features of microfluidic reactors. An outlook on opinions and predictions concerning the future development of powder technology with microfluidics is specially provided. | Guangsheng Luo Le Du Yujun Wang Yangcheng Lu Jianhong Xu | 2011 | Particuology2011，9，6： | 15 |
| 2 | Preparation and ion exchange properties of egg-shell glass beads with different surface morphologies显示文摘A subcritical water treatment method was developed for preparing porous-surfaced glass beads with an egg-shell structure in a batch reactor. Based on the 'corrosion-ion-migration-recondensation' strategy, ordinary soda-lime glass beads with a diameter of about 100 m were made first to react with subcritical water to effect controlled quantity of silicate dissolution of glass by adjusting treatment time and temperature. The dissolved silicate was then made to recondense on the glass core to form different porous shell morphologies: pores, flakes and fibers. Among these, glass beads coated with fibers with surface area of 154.5 m2/g, pore volume of 0.27 cm3/g and pore size of 7.1 nm were obtained at 573 K after 2 h of treatment. The prepared porous-surfaced glass beads were then used as adsorbent for heavy metal ions, showing various ion exchange properties. Glass beads covered with fibers displayed fast kinetics and high sorption capacity because of their egg-shell structure and high surface area. More than 90% of copper ions were adsorbed within 100 min from a solution with an initial concentration of 110 mg/L at 313 K. Ion sorption capacities were 149.33, 81.33 and 42.96 mg/g respectively for Ag+, Cu2+ and Ni2+ at 313 K. A green and low-cost method was thus developed to produce egg-shell-structured porous glass with high sorption capacity. | Chun Shen Yujun Wang Jianhong Xu Yangcheng Lu Guangsheng Luo | 2012 | Particuology2012，10，3： | 6 |
| 3 | Tailoring morphology and bulk density of magnesium ethoxide particles by adding n-hexane and silicone oil显示文摘In this work,we used the in ert substances silic one oil a nd n-hexane to modulate the solve nt environ ment,and in so doing tailor the preparation of magnesium ethoxide(Mg(0Et)2)particles.We found the following:(1)non polar n-hexane mainly modulates the polarity of the solvent to control the precipitation rate and size of the Mg(OEt)2 seeds,thereby triggering accelerated nucleation to form small primary particles;and(2)silicone oil(relatively high polarity and viscosity)facilitates the growth and agglomeration stage,to improve inter-particle dispersion and obtain relatively uniform Mg(OEt)2 particles.We summarized these findings in a comm on mechanism for preparing Mg(OEt)2 particles with uniform morphology,small size,and high bulk density as per the synergistic effect of n-hexane and silicone oil.The ratios of silicone oil end n-hexane are flexible,and afford various regular and well-dispersed Mg(OEt)2 particles that are 5-30μm in size and 0.2-0.7 g/cm^3 in bulk density.The nanoparticles thus have the potential to serve in diverse applications such as catalysis. | Zhou Lan Yangcheng Lu | 2020 | Particuology2020，18，6： | 4 |
| 4 | Simulation of the mixing process in a straight tube with sudden changed cross-section显示文摘In this work, we revised the expression of mixing intensity to describe the mixing output through a cross section in a flow system by considering heterogeneity of flow field, and carefully investigated the mixing process along a straight tube with expanding/contracting cross section by simulation method. The simulation results show that a sudden expansion of cross section has remarkable mixing intensification effect within a limited period(on the sub-second scale) or tube-length(on the millimeter scale), corresponding to the generation of considerable local vortices determined by both the flow capacity and the ratio of cross section change; a sudden contraction of cross section has instantaneous but weak mixing intensification effect; through introducing a local expansion structure with proper length, as the combination of sudden expansion and sudden contraction, their mixing intensification effects could be superposed. Besides, the rationality and importance are experimentally verified to explore the time profile of mixing intensity and carry out the vortex analysis by simulation for enhancing the selectivity of a complicated reaction system. These progresses may lead to more meaningful quantitative description of mixing process in a flow microreactor for some specific chemical processes. | Yangcheng LU Shan Zhu Kai Wang Guangsheng Luo | 2016 | Chinese Journal of Chemical Engineering2016，24，6： | 3 |
| 5 | Kinetic study on selective extraction of HCl and H_3PO_4 in a microfluidic device显示文摘In the extraction method for preparing KH2PO4,one of the key processes is the selective extraction of HCl over H3PO4.In our work,extraction kinetic studies have been carried out in a microfluidic device with a coaxial microchannel,using the extractant of 33.3%(by volume) trioctylamine(TOA) dissolved in n-octanol,with different aqueous phases:the HCl solution,the H3PO4 solution,and H3PO4 and KCl solutions of different concentrations.The changes of the extraction efficiency of HCl and H3PO4 and the selectivity for HCl along with the residence time were investigated.We found that fast extraction kinetics could be realized in microfluidic devices,and that HCl could be extracted faster than H3PO4 due to smaller mass transfer resistance and much stronger reaction between HCl and TOA.For the extraction of H3PO4 and KCl solutions,the selectivity for HCl first increased and then decreased when TOA was in excess of H3PO4 in the initial feeds,and in contrast,always increased when H3PO4 was in excess of TOA in the initial feeds.The diverse changes of selectivity for HCl along with the residence time indicate that a dynamic control of selectivity in microfluidic devices may be important and accessible for improving the KH2PO4 conversion efficiency in extraction method. | Fang Zhao Yangcheng Lu Kai Wang Guangsheng Luo | 2016 | Chinese Journal of Chemical Engineering2016，24，2： | 2 |
| 6 | Effects of temperature and phosphoric acid addition on the solubility of iron phosphate dihydrate in aqueous solutions显示文摘As important controlling factors for the synthesis of iron phosphate materials by liquid-phase precipitation, the solubilities of iron phosphate dihydrate were systematically measured at H_3PO_4 concentrations from 1.13 wt%to 10.7 wt%, temperature from 298.15 to 363.15 K, and atmosphere pressure in this work. The solubility was found to increase 5 orders of magnitude or more with increasing the concentration of phosphoric acid, and decrease 1 to 2 orders of magnitude with increasing the equilibrium temperature. The phosphoric acid addition and temperature were found to affect the solubility of iron phosphate dihydrate by the formation or dissociation of coordination species, which could further accelerate the phase transformation from the amorphous iron phosphate dihydrate to orthorhombic iron phosphate dehydrate by dissolution–recrystallization mechanism.The high dependences of the solubility of iron phosphate materials on H_3PO_4 concentration and temperature were also well predicted by calibration equations, which are meaningful for quantitatively understanding the precipitation process and sequential crystalline structure transformation and pursuing a rational strategy for synthesizing specific iron phosphate materials. | Tongbao Zhang Yangcheng Lu Guangsheng Luo | 2017 | Chinese Journal of Chemical Engineering2017，25，2： | 2 |
| 7 | Preparation of Tb(Pht) 3 phen/Rubber Composites and Characterization of Their Fluorescent Properties显示文摘 | YangCheng Liu Li Lu Yonglai | 2005 | Journal of Applied Poly- mer Science2005，96，： | 1 |
| 8 | In situ prepara tion of magnetic chitosan/Fe_3O_4 composite nanoparticles in tiny pools of water in oil microemulsion显示文摘 | Zhi Jia Wang Yujun Lu Yangcheng | 2006 | Reactive & Functional Polymers2006，66，： | 1 |
| 9 | 显示文摘 | Lu Yanqiu Zhuang Chunquan Huang Yangcheng | 2006 | Chinese Journal of Semiconductors2006，27，： | 1 |
| 10 | Synthesis of epichlorohydrin from 1,3-dichloropropanol using solid base显示文摘In this work, the synthesis of epichlorohydrin(ECH) from 1,3-dichloropropanol(DCP) by using solid sodium hydroxide(NaOH) is carefully investigated. Inert organic solvent, 1-octanol, is introduced to ensure reaction intensity under control. The reaction performances with respect to apparent kinetics and selectivity are determined to explore optimized reaction conditions and confirm potentials for enhancing productivity in one batch. The dissolution and liquid phase reaction mechanism and instant reaction assumption are proposed and verified through process analysis. A process design towards free additional water is schematically figured out to manipulate solid NaOH, by-product,and unreacted starting materials to realize a nearly closed circuit. This process allows high selectivity over 97% and complete DCP conversion at 323.2 K within a reaction time less than 20 min. Other advantages include near-zero wastewater emission, economically possible NaOH regeneration from NaCl, and robust operating condition window. | Yangcheng Lu Tianyang Li Rui Wang Guangsheng Luo | 2017 | Chinese Journal of Chemical Engineering2017，25，3： | 1 |
| 11 | In situ preparation of magnetic chitosan/Fe 3 O 4 composite nanoparticles in tiny pools of water-in-oil microemulsion显示文摘 | Jia Zhi Yujun Wang Yangcheng Lu Jingyu Ma Guangsheng Luo | 2006 | Reactive and Functional Polymers2006，，12： | 1 |
| 12 | Revisiting ear- ly warning signals of corporate credit default using lin-guistic analysis 显示文摘 | Lu Yangcheng Shen C H Wei Yuchen | 2013 | Pacific-Basin Finance Journal2013，24，： | 1 |
| 13 | Relationship between breakthrough curve and adsorption isotherm of Ca(Ⅱ)imprinted chitosan microspheres for metal adsorption显示文摘In this work,an equilibrium-dispersion model was successfully established to describe the breakthrough performance of Ca(II) imprinted chitosan(Ca(II)-CS) microspheres packed column for metal adsorption,and the assumptions of Langmuir isotherms and axial dispersion controlled mass transfer process were confirmed.The axial dispersion coefficient in Ca(II)-CS microspheres packed column was found to be almost proportional to the linear velocity and fit for prediction through single breakthrough test.Sensitivity analysis for breakthrough curve indicated the axial dispersion coefficient as well as Langmuir coefficient was sensitive variable for deep removal requirement.The retrieval of the adsorption isotherms of Ca(II)-CS microspheres from breakthrough curve was fulfilled by modelling calibration.A strategy based on the correlation between adsorption isotherms and breakthrough performance was further proposed to simplify the column adsorption design using absorbents with small/uniform size and fast adsorption kinetics like Ca(II)-CS microspheres to cut down the gap between lab and industry. | Yangcheng Lu Jing He Longwen Wu Guangsheng Luo | 2016 | Chinese Journal of Chemical Engineering2016，24，2： | 1 |
| 14 | Petroleum exploration breakthrough and geological significance in Cretaceous Yingcheng and Denglouku formations of Shuangcheng area, northern Songliao Basin, NE China显示文摘Based on drilling geological,geochemical,geophysical and production test data,the characteristics of source rocks,reservoir rocks and caprocks,as well as the process of hydrocarbon generation,trap evolution and oil accumulation of the oil-bearing assemblage composed of the Cretaceous Yingcheng Formation(K1yc)and Denglouku Formation(K1d)in the Shuangcheng area,northern Songliao Basin,NE China,were analyzed by using the research methods for petroleum systems.The source rocks mainly exist in K1yc,with the organic matters mainly originated from lower aquatic organisms and algae,and reaching the grade of high-quality source rock in terms of organic abundance.The crude oil,which is characterized by low density,high freezing point and high wax content,is believed to have generated by the K1yc source rocks.The reservoir rocks include K1d sandstones and K1yc glutenites.The mudstone in the fourth member of K1d serves as the direct caprock of the oil reservoir.The oil was generated during the period between Yaojia Formation and Nenjiang Formation,and then accumulated during the periods of Nenjiang Formation and Paleogene–Neogene.The traps evolved in three stages:the late Yingcheng Formation,the late Quantou Formation and the late Nenjiang Formation,forming structural and structural-lithologic reservoirs.It is concluded that good source-reservoir-caprock assemblage,late hydrocarbon charging,short migration distance and stable tectonic setting are favorable factors for the formation of oil reservoirs. | LIU Chao FU Xiaofei LI Yangcheng WANG Haixue SUN Lidong LU Jiamin LI Junhui SUN Youhai SHI Lidong HU Huiting YUAN Hongqi YANG Zicheng | 2023 | Petroleum Exploration and Development2023，50，1： | 0 |
| 15 | Influence of coagulation bath on morphology of cellulose membranes prepared by NMMO method显示文摘To control the morphology of cellulose membranes used for separation,they were prepared by the NMMO method using water,methanol,ethanol and their binary solution as coagulation baths.Morphologies of the surface and cross section of dry membranes were observed.The pore structure parameters of wet membranes were determined.By comparison,the process and mechanism of pore formation in dry membranes were suggested,and the relativity of cellulose crystal size to average pore diameter in wet membranes and their influences were discussed.The results show that the morphology of dry membranes is clearly varied with coagulation baths,while the porosity of wet membranes is almost constant.Porous structures can appear in the compact region of dry membranes due to swelling from water.These pores have a virtual effect on the average pore diameter of wet membranes.By changing the composition of coagulation baths,the microstructure of cellulose membranes in a dry or wet environment can be adjusted separately. | Yangcheng LU Yingxin WU | 2008 | Frontiers of Chemical Science and Engineering2008，2，2： | 0 |
| 16 | Highly efficient and flexible preparation of water-dispersed Fe3O4 nanoclusters using a micromixer显示文摘Solvent exchange is widely used to synthesize magnetic nanoclusters (MNCs).However,it remains a challenge to increase the production and decrease the addition ofsurfactants,both of which are important for the application and functionalization of MNCs.Herein,we use a rapid and tunable mixing method to control the assembly of Fe3O4 nanoparticles.This method involves shear-mixing in a channel of a Tjunction micromixer.Smaller and more monodisperse MNCs were synthesized with less surfactant,when compared with conventional bulk synthesis.Varying the mixing rate and the formula of the magnetic suspension allowed for the flexible adjustment of the nanocluster size while maintaining a uniformly sized MNCs.The flow synthesis and ease of scale-up make this method potentially suitable for broad industrial application. | Xiaojing Liu Yangcheng Lu | 2019 | Particuology2019，17，4： | 0 |
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