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| 1 | Molecular simulation of oligomer inhibitors for calcite scale显示文摘Molecular simulation was performed to study the interaction between CaCO3 crystal and several oligomer inhibitors, by using the equilibrium morphology method to calculate the growth morphology of CaCO3 without inhibitors. The calculated morphology agreed well with SEM photographs. Then, a double-layer model was built to investigate the interaction between calcite crystal and oligomer inhibitors containing maleic anhydride (MA) and acrylic acid (AA). Interaction energy per gram of an oligomer inhibitor was introduced as a scale of inhibition efficiency of different monomers. The results indicated that, for calcite scale inhibition, acrylamide (AM) and vinyl phosphonic acid (VPA) were the most efficient monomers, while allylsulfonic acid (AS) was the poorest. Increasing proportion of AM in dimer inhibitor molecule would improve the inhibition efficiency of MA, though, for a trimer, such as MA-AA-AM, certain sequence of monomers in the inhibitor molecule was necessary besides higher proportion of AM. | Qiuyu Zhang Hua Ren Wenwen Wang Junping Zhang Hepeng Zhang | 2012 | Particuology2012，10，3： | 11 |
| 2 | Enhancing the leaching effect of an ion-absorbed rare earth ore by ameliorating the seepage effect with sodium dodecyl sulfate surfactant显示文摘Ameliorating the problem of low leaching efficiency,long leaching period,and high agent consumption should be studied to efficiently exploit ion-absorbed rare earth ore resources.In this study,the surfactant sodium dodecyl sulfate(SDS) is used to enhance the leaching effect of an ion-absorbed rare earth ore by ameliorating the seepage effect for the first time.The effects of surfactant concentration,leaching agent dosage,solution flow velocity,and solution pH on the leaching rate were explored,and the mechanism of SDS was discussed.Under the optimum conditions,the addition of a small amount of SDS(mass fraction0.04%) can increase the leaching rate by about 5%,shorten the leaching period,and reduce the consumption of the leaching agent.SDS significantly ameliorates the seepage effect of the ore body by reducing the surface tension of the leaching agent and ameliorating the wettability of the mineral surface.This effect is the main factor that improves the leaching efficiency.DFT(density functional theory) calculation results show that SDS can react with rare earth ions,which reduces the adsorption strength on clay mineral surfaces.Hence,rare earth ions are easily exchanged by ammonium ions,and mass transfer is enhanced. | Yongbing Zhang Boyuan Zhang Siqi Yang Zhigang Zhong Hepeng Zhou Xianping Luo | 2021 | International Journal of Mining Science and Technology2021，31，6： | 8 |
| 3 | Preparation of SiO_2/TiO_2 Janus particles by electrostatic assembly,hydrolysis and calcination显示文摘This paper describes a novel chemical method for preparing SiO_2/TiO_2 Janus particles.First,polystyrene(PSt)/SiO_2 particles with a raspberry-like structure are prepared by electrostatic assembly.The influences of the reaction time of sulfonation and the treatment times of polyelectrolyte solutions(PDADMAC,PSS)on PSt and SiO_2 are investigated with respect to the surface charge density of the particles.SiO_2/TiO_2 Janus particles are then obtained by hydrolysis of butyl titanate on the surface of PSt/SiO_2 particles followed by a calcination process.Particle size analyzer,Zeta potential instrument,FTIR,TEM and SEM are used to characterize the particle size,the amount of charge on the surface of PSt and SiO_2 particles and the compositions and morphologies of PSt/SiO_2,SiO_2/TiO_2 and PSt/SiO_2/TiO_2.The diameters of the PSt,SiO_2,PSt/SiO_2 and SiO_2/TiO_2 particles are 2.0 μm,303 nm,2.7 μm and 330nm,respectively. | Baoliang Zhang Qiuyu Zhang Hepeng Zhang Xinlong Fan Dezhong Yin Xiangjie Li Wei Li | 2013 | Particuology2013，11，5： | 6 |
| 4 | Pore structure characterization and seepage analysis of ionic rare earth orebodies based on computed tomography images显示文摘Pore network structure of ore body is a diffusion channel of leaching agent solution that exerts a significant influence on seepage.The ore body structure,pore distribution,pore and throat size,and pore network characteristics of topsoil,weathered,and semiweathered layers of ionic rare earth ore in southern Jiangxi Province were explored in this study.The effect of leaching operation on the pore structure was investigated,and main factors affecting the seepage were analyzed.Results showed that the semiweathered layer presents a dense structure and a small number of unconnected pores.Pores of topsoil and weathered layers are mainly long and narrow column openings with some planar fractures.Even pore distribution and large size span were observed.Compared with the weathered layer,the topsoil layer demonstrates larger voids,smaller average pore volume and equivalent radius,and fewer coordination throats;however,the average equivalent radius of the throat in the topsoil layer is larger and largescale channels exist through ore body vertically.Hence,permeability of the topsoil layer is significantly higher than that of the weathered layer.Colloidal clay minerals migrate easily and the occurrence of silting in the small porosity blocks the throat and significantly decreases the permeability of the ore body in the leaching process.The equivalent radius of the throat is the key to the seepage.Reducing the migration of fine particles is an effective measure to protect the throat and shorten the leaching period. | Xianping Luo Yongbing Zhang Hepeng Zhou Kunzhong He Boyuan Zhang Dongming Zhang Weijing Xiao | 2022 | International Journal of Mining Science and Technology2022，32，2： | 5 |
| 5 | Precipitation Microphysical Processes in the Inner Rainband of Tropical Cyclone Kajiki (2019) over the South China Sea Revealed by Polarimetric Radar显示文摘Polarimetric radar and 2D video disdrometer observations provide new insights into the precipitation microphysical processes and characteristics in the inner rainband of tropical cyclone(TC)Kajiki(2019)in the South China Sea for the first time.The precipitation of Kajiki is dominated by high concentrations and small(<3 mm)raindrops,which contribute more than 98%to the total precipitation.The average mass-weighted mean diameter and logarithmic normalized intercept are 1.49 mm and 4.47,respectively,indicating a larger mean diameter and a lower concentration compared to the TCs making landfall in eastern China.The ice processes of the inner rainband are dramatically different among different stages.The riming process is dominant during the mature stage,while during the decay stage the aggregation process is dominant.The vertical profiles of the polarimetric radar variables together with ice and liquid water contents in the convective region indicate that the formation of precipitation is dominated by warm-rain processes.Large raindrops collect cloud droplets and other raindrops,causing reflectivity,differential reflectivity,and specific differential phase to increase with decreasing height.That is,accretion and coalescence play a critical role in the formation of heavy rainfall.The melting of different particles generated by the ice process has a great influence on the initial raindrop size distribution(DSD)to further affect the warm-rain processes.The DSD above heavy rain with the effect of graupel has a wider spectral width than the region without the effect of graupel. | Hepeng ZHENG Yun ZHANG Lifeng ZHANG Hengchi LEI Zuhang WU | 2021 | Advances in Atmospheric Sciences2021，38，1： | 3 |
| 6 | Key synthesis of magnetic Janus nanoparticles using a modified facile method显示文摘Inorganic/organic poly(methylmethacrylate-acrylic acid-divinylbenzene) iron oxide Janus magnetic nanoparticles(P(MMA-AA-DVB)/Fe_3O_4) with strong magnetic domains and unique surface functionalities were prepared using a solvothermal process.The P(MMA-AA-DVB) nanoparticles were prepared via soapfree emulsion polymerization and used as a precursor for preparing Janus nanoparticles.The morphology and magnetic properties of the magnetic Janus nanoparticles formed were characterized using a laser particle size analyzer,transmission electron microscopy,Fourier transform infrared spectroscopy,vibrating sample magnetometry,and thermogravimetric analysis.The synthesized P(MMA-AA-DVB)/Fe_3O_4 magnetic Janus nanoparticles were characterized by a Janus structure and possessed a stable asymmetric morphology after being dually functionalized.The particle size,magnetic content,and magnetic domain of the P(MMA-AA-DVB)/Fe_3O_4 magnetic Janus nanoparticles were 200 nm,40%,and 25 emu/g,respectively.The formation mechanism of the Janus nanoparticles was also investigated,and the results revealed that the reduction of Fe^(3+) ions and growth of Fe_3O_4 took place on the surface of the P(MMA-AA-DVB) polymeric precursor particles.The size of the Janus particles could be controlled by narrowing the size distribution of the P(MMA-AA-DVB) precursor nanoparticles. | Nisar Ali Baoliang Zhang Hepeng Zhang Wajed Zaman Wei Li Qiuyu Zhang | 2014 | Particuology2014，12，6： | 2 |
| 7 | Preparation of PS/Ag mierospheres and its application in microwave ab- sorbing coating显示文摘 | Zhao Wen Zhang Qiuyu Zhang Hepeng | 2009 | J Alloys Compd2009，473，： | 1 |
| 8 | Preparation and characterization of novel immobilized Fe 3 O 4 @SiO 2 @mSiO 2 –Pd(0) catalyst with large pore-size mesoporous for Suzuki coupling reaction显示文摘 | Wei Li Baoliang Zhang Xiangjie Li Hepeng Zhang Qiuyu Zhang | 2013 | Applied Catalysis A General2013，，： | 1 |
| 9 | Synthesis of PS/Ag asymmetric hybrid particles via phase separation and self-assembly显示文摘This article presents a facile approach to preparation of polystyrene/silver(PS/Ag) asymmetric hybrid particles.In this method,polystyrene/polyglycidyl methacrylate(PS/PGMA)Janus particles were synthesized via internal phase separation triggered by evaporation of dichloromethane(DCM) from PS/PGMA/DCMin water emulsion droplets.Then,the Janus particles were aminated and sequentially carboxylated to obtain PS/PCMA-NHO_2 and PS/PCMA-COOH particles.Ag*self-assembled on the surface of PGMA hemisphere of the functionalized PS/PCMA particles by coordinating with amine/carboxyl.PS/Ag asymmetric hybrid particles with 7.29 wt%of Ag were obtained by reduction of Ag^+.Scanning electron microscopy,energy-dispersive X-ray spectroscopy and transmission electron microscopy results confirmed that Ag was asymmetrically distributed on the surface of polymer particles. | Xinlong Fan Qiuyu Zhang Hepeng Zhang Baoliang Zhang Chunmei Li Xiangjie Li Xingfeng Lei | 2013 | Particuology2013，11，6： | 1 |
| 10 | Preparation of PS/Ag microspheres and its application in microwave absorbing coating 显示文摘 | Zhao Wen Zhang Qiuyu Zhang Hepeng | 2009 | Journal of Alloys and Compounds2009，473，1： | 1 |
| 11 | Insights into the floatability between spodumene and albite from crystal chemistry standpoint显示文摘Spodumene is a silicate mineral rich in lithium.However,the gangue mineral,albite has similar crystal chemical structure and composition to spodumene.In this work,the density functional theory(DFT)calculation was taken to research the floatability from the perspective of crystal chemistry.And contact angle test and reagent adsorption test were used to support the simulation results.In addition,the weighted total density of broken bonds is proposed for the first time to judge the generation probability of cleavage surface.The DFT calculation results display that the Na and Al sites on the albite surface are the adsorption sites of water molecules.While the water molecules only bond with Al atom on the surface of spodumene and each Al site can adsorb only one water molecule.Thus,the wetting effect of water molecules on the albite surface is stronger than that of spodumene.This is consistent with the result of contact angle.In sodium oleate system,the oleic acid anion is adsorbed on the spodumene surface in form of a multicomponent ring while the albite is a single ring.Theoretically,oleic acid anion can be strongly adsorbed on the surface of spodumene and albite under vacuum.The adsorption strength of spodumene is higher than that of albite.However,on hydrated surface,the adsorption strength of oleic acid anion on mineral surface is greatly reduced due to the interaction between water molecules and metal site on mineral surface.Thus,spodumene and albite are hard to float without external activated ions in sodium oleate system. | Hepeng Zhou Fanxin Xie Yongbing Zhang Boyuan Zhang Siqi Yang Xianping Luo | 2022 | International Journal of Mining Science and Technology2022，32，6： | 1 |
| 12 | Preparation of thermoresponsive Fe3O4/P (acrylic acid methy methacrylate N-isopropylaerylamide) magnetic composite microspheres with controlled shell thickness and its releasing property for phe nolphthalein 显示文摘 | Baoliang Zhang Hepeng Zhang Xinlong Fan | 2013 | Journal of Colloid and Interface Science2013，398，： | 1 |
| 13 | Preparation of magnetic composite microspheres by surfactant free controlled radical polymerization: Preparation and characteristics 显示文摘 | ZHANG Hepeng ZHANG Qiuyu ZHANG Baoliang | 2009 | Journal of Magnetism and Magnetic Materials2009，321，： | 1 |
| 14 | A facileapproach for the synthesis of magnetic separable Fe3O4@TiO2,core-shell nanocomposites as highly recyclable photocatalysts显示文摘 | XIN Tiejun MA Mingliang ZHANG Hepeng | 2014 | Applied Surface Science2014，288，： | 1 |
| 15 | Inhibition performance of 2-mercaptobenzothiazole derivatives in CO2 saturated solution and its adsorption behavior at Fe surface 显示文摘 | Zhang Junping Zhang Qiuyu Ren Hua Zhao Wen Zhang Hepeng | 2007 | Applied Surface Science2007，253，： | 1 |
| 16 | Identifying the roles of Ce^(3+)-OH and Ce-H in the reverse water-gas shift reaction over highly active Ni-doped CeO_(2) catalyst显示文摘Nickel-CeO_(2)-based materials are commonly used for the thermal catalytic hydrogenation of CO_(2).However,high Ni loadings and low CO selectivity restrict their use in the reverse water–gas shift(RWGS)reaction.Herein,we demonstrate a highly active,robust,and low-Ni-doped(1.1 wt.%)CeO_(2) catalyst(1.0-Ni-CeO_(2)).The Ni-based-mass-specific CO formation rate reaches up to 1,542 mmol·gNi^(−1)·h^(−1) with 100%CO selectivity at 300°C for 100 h,among the best values reported in the literature.Density functional theory(DFT)and diffuse reflectance infrared Fourier transform spectroscopy(DRIFTS)results reveal that the enhanced catalytic activity is attributed to the abundant Ce–H species,while the high selectivity results from low CO affinity.More importantly,a new reaction mechanism is proposed,which involves the reduction of bicarbonate to generate formate intermediate and CO by the H−released from Ce–H species.The new findings in this work will benefit the design of economic,efficient,and robust catalysts for low-temperature RWGS reactions. | Haidong Shen Yujuan Dong Shaowei Yang Yuan He Qimeng Wang Yueling Cao Wenbin Wang Tianshuai Wang Qiuyu Zhang Hepeng Zhang | 2022 | Nano Research2022，15，7： | 1 |
| 17 | Preparation of magnetic composite microspheres by surfactant free controlled radical polymerization: Preparetion and characteristics显示文摘 | Zhang Hepeng Zhang Qiuyu Zhang Baoliang | 2009 | Journal of Magnetism and Magnetic Materials2009，3，21： | 1 |
| 18 | Prepara- tion of PS/Ag microspheres and its application in micro- wave absorbing coating 显示文摘 | Zhao Wen Zhang Qiuyu Zhang Hepeng | 2009 | Journal of Alloys and Com- pounds2009，473，12： | 1 |
| 19 | Magnetic Microcapsules with Inner Asymmetric Structure: Controlled Preparation, Mechanism, and Application to Drug Release显示文摘 | Zhang Baoliang Zhang Hepeng Tian Lei | 2015 | Chemical Engineering Journal2015，275，1： | 1 |
| 20 | Inhibition performance of 2-mercaptobenzothiazole derivatives in CO 2 saturated solution and its adsorption behavior at Fe surface显示文摘 | Junping Zhang Qiuyu Zhang Hua Ren Wen Zhao Hepeng Zhang | 2007 | Applied Surface Science2007，，18： | 1 |
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