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| 1 | Preparation of Spherical FePO4 by Chemical Co-precipitation Combined with Spray-Drying显示文摘Well-shaped spherical agglomerates of FePO4 particles were prepared by a novel method:chemical co-precipitation combined with spray-drying.Tap density analysis,Brunauer-Emmett-Teller analysis,characterizations of X-ray diffraction,scanning electron microscopy,and transmission electron microscopy confirmed that the micron-sized spherical agglomerates with high specific surface area and high tap density were composed of the uniform nano-sized particles.The effects of pH and reaction time on the morphology of the FePO4 particles were investigated by experimental and theoretical analyses.The analyses revealed that amorphous FePO4 was responsible for forming a well-shaped spherical agglomerate,and the ideal spherical particles were obtained at pH 3.The reaction time also played a significant role in controlling the size and surface morphology of the FePO4 particles,and smooth spherical FePO4 particles were obtained at a reaction time of 6 h.By this novel method,poly-porous spherical iron phosphate particles were prepared,which can be used with high efficiency in some special fields,especially as a precursor for synthesizing LiFePO4 and catalysts. | Leping Dang Hongtao Zhang Xin Xu Xiaojun Lang | 2020 | Transactions of Tianjin University2020，26，1： | 3 |
| 2 | Paraffin/SiC as a Novel Composite Phase-Change Material for a Lithium-Ion Battery Thermal Management System显示文摘A lithium-ion battery thermal management system has always been a hot spot in the battery industry. In this study, a novel high-thermal-conductivity composite phase-change material(CPCM) made by paraffin wax and silicon was adopted to facilitate heat transfer. Moreover, high resistance or even insulation of CPCM is capable of preventing short circuits between the cells. The heat transfer mechanism of CPCMs was determined under a scanning electron microscope. A thermogravimetric analyzer was employed to determine the thermal stability. A diff erential scanning calorimeter was used to explore the thermophysical properties of the composite samples. By comparing the results of the experiment, it was reported that under the silicon carbide content of 5%, the parameters were better than others. The phase-change enthalpy of CPCM was 199.4 J/g, the leakage rate of liquid was 4.6%, and the melting point was 53.6℃. To verify the practicality of CPCM, a three-dimensional layered battery pack model was built in the COMSOL Multiphysics software. By simulating the thermal runaway inside the battery packs of various materials, it was reported that the addition of CPCM significantly narrowed the temperature range of the battery pack from 300–370 to 303–304 K. Therefore, CPCM can eff ectively increase the rate of heat transfer to prevent the chain of thermal runaway reactions. It also enables the battery pack to run at a stable temperature. | Wei Kang Yiqiang Zhao Xueheng Jia Lin Hao Leping Dang Hongyuan Wei | 2021 | Transactions of Tianjin University2021，27，1： | 2 |
| 3 | Effects of Formulation Parameters and Process Variables on the Properties of Granules Obtained by Reactive Granulation显示文摘In this work, granulation between dodecyl-benzenesulfonic acid and sodium carbonate was investigated in a laboratory-scale high shear mixer. The effects offormulation parameters and process variables, including primary carbonate size, binder content, impeller speed, and operating temperature, were correlated to the properties ofthe product granules. Design ofexperiment and analysis ofvariance were combined to analyze the experimentaldata, and results showed that larger granule sizes with fewer fine particles can be obtained by employing higher binder contents and larger sodium carbonate sizes. The shear force ofthe impeller can extensively break oversized granules. The binder content exerted a contrasting effect on the flowability ofgranules formed with two kinds ofsodium carbonate, likely because ofdifferences in the liquid saturation ofthe solids. The dissolution rate determined by in-line size analysis showed that high binder contents were beneficialto dissolution performance, and the relationships between Hunter color and tested parameters were evaluated. The results ofthis work can be used as a reliable guidance for process controland optimization in powder detergent manufacturing. | Leping Dang Xiaojun Lang Xu Li Hongyuan Wei | 2018 | Transactions of Tianjin University2018，24，3： | 2 |
| 4 | The influence of impurities on phosphoric acid hemihydrate crystallization显示文摘 | Dang Leping Wei Hongyuan Zhu Zheng | 2007 | Journal of Crystal Growth2007，307，1： | 1 |
| 5 | The influence of impurities on phosphoric acid hemihydrates crystallization 显示文摘 | Dang Leping Wei Hongyuan | 2007 | Journal of Crystal Growth2007，307，1： | 1 |
| 6 | Effect of Non-reactive Powder Particle Properties on Dry Agglomeration in a High Shear Mixer显示文摘The effect of non-reactive powder particle properties on the detergent dry agglomeration process in a high shear mixer was investigated. Three types of micron-scale silica were chosen as the non-reactive fine powders and a semi-solid alkyl ethyl ethoxy sulfate(AES) paste with ultra-high viscosity was chosen as the binder. The granules were characterized using massbased granule size distribution, scanning electron microcopy, and bulk density tests. The results revealed that powder particle size plays a leading role in agglomeration behavior. A decrease in the median particle size results in enhanced dispersion of silica particles in the AES paste binder droplets, which leads to the formation of uniform granules that are slightly affected by compacting forces. Agglomerate quality, using silica with high oil absorption as well as optimum particle size, was satisfactory, and the product exhibited a smaller median particle size, narrower size distribution, and superior anti-caking capacity under the same liquid-to-solid ratio(L/S). | Hongyuan Wei Bohao Feng Guangzong Zhao Xiao Tian Leping Dang | 2018 | Transactions of Tianjin University2018，24，5： | 1 |
| 7 | L-Glutamic acid polymorph control using amino acid additives显示文摘 | Mo Yuxin Dang Leping Wei Hongyuan | | 0，，： | 1 |
| 8 | The influence of impurities on phosphoric acid hemihydrate crystallization显示文摘 | Leping Dang Hongyuan Wei Zhang Zhu and Jingkang Wang | 2007 | Journal of Crystal Growth2007，，： | 1 |
| 9 | Solubility of alpha-form and beta-form of L-glutamic acid in different aqueous solvent mixtures 显示文摘 | MO Yuxin DANG Leping WEI Hongyuan | 2011 | Fluid Phase Equilib2011，300，12： | 1 |
| 10 | Regime Map of Dry Neutralization Agglomeration Process Containing Non-Reactive Ingredient on a Laboratory Scale显示文摘This study described a regime map for dry neutralization agglomeration. Based on the map, the effects of selected key parameters, such as ingredient composition, operation temperature, agitation speed, and size of Na_2CO_3 particles, were investigated using a laboratory-scale mixer, and properties of the agglomeration product were analyzed, including particle size distribution, Hunter color, and flowability. Torque curves evolving during the process were correlated with the system flowability. Three distinguishable regimes were indicated, dry, wet, and transitional, and the agitation speed was found to have a different influence on the agglomeration process for the three regimes. Furthermore, the influence of temperature on reactive agglomeration significantly differed from that in agglomeration processes in which the binder was non-reactive. | Leping Dang Xu Li Jinsheng Fu Xiaojun Lang Hongyuan Wei | 2019 | Transactions of Tianjin University2019，25，1： | 1 |
| 11 | L-Glutamic acid polymorph control using amino acid additives 显示文摘 | Mo Yuxin Dang Leping Wei Hongyuan | 2011 | Ind Eng Chem Res2011，50，10： | 1 |
| 12 | Effects of ionic im- purities ( Fez * and SO2 - ) on the crystal growth and morphology of phosphoric acid hemihydrate during batch crystallization 显示文摘 | Dang Leping Wei Hongyuan Wang Jingkang | 2007 | Ind Eng Chem Res2007，46，33： | 1 |
| 13 | The influence of impurities on phosphoric acid hemihydrate crystallization显示文摘 | Dang Leping Wei Hongyuan Zhu Zheng | 2007 | Journal of Crystal Growth2007，307，： | 1 |
| 14 | The influence of impurities on phosphoric acid hemihydrate crystallization 显示文摘 | Dang Leping Wei Hongyuan Zhu Zheng | 2007 | Journal of Crystal Growth2007，307，： | 1 |
| 15 | Synergistic Effect of Cocamidopropyl Betaine and Sodium Lauroyl Sarcosinate显示文摘In this study,we investigated the synergistic effect of a zwitterionic surfactant(cocamidopropyl betaine)and amino acid surfactant(sodium lauroyl sarcosinate)by measurements of surface tension,rheological properties,dynamic light scattering(DLS),and transmission electron microscopy(TEM).The results confirm the formation of wormlike micelles in the mixed system,which leads to superior surface activity as compared to that of an individual surfactant.Stable and dynamic viscoelastic measurements were also performed to explore the characteristics of wormlike micelles at different mole fractions,p H values,and temperatures.The results indicate that the strongest wormlike structure formed under the conditions of X_(1)=0.5,pH=4.7,and C T=600 mmol/L.The size and morphology of the mixed micelles were obtained by DLS and TEM.The results of this work offer insight into the interaction between zwitterionic and amino acid surfactants,which will contribute to the design of complex surfactants. | Hongyuan Wei Rui Zhang Zhong Lei Leping Dang | 2021 | Transactions of Tianjin University2021，27，5： | 0 |
| 16 | Solubility and Thermodynamic Properties of Sulfamethazine-Saccharin Cocrystal in Pure and Binary (Acetonitrile + 2-Propanol) Solvents显示文摘In this work,a new crystallization method was used to prepare two polymorphs of sulfamethazine-saccharin(SMT-SAC)cocrystal in bulk.The purity and crystal form of both polymorphs were confirmed by optical microscopy,scanning electron microscopy,powder X-ray diff raction,diff erential scanning calorimetry,and thermogravimetric analysis.Moreover,the solubility of the stable form(form Ⅱ)was determined by gravimetric analysis in nine pure solvents and one binary(acetoni-trile+2-propanol)solvent at temperatures ranging from 278.15 to 348.15 K at atmospheric pressure.Experimental data were correlated using the modified Apelblat model,theλh equation,the nonrandom two-liquid(NRTL)model,the Jouyban-Acree model,and the CNIBS/Redlich-Kister model.Finally,the apparent thermodynamic properties,such asΔ_(dis)G,Δ_(dis) H,andΔ_(dis) S,were calculated on the basis of the activity coefficient obtained by the NRTL model.All the models correlate well,and all the experimental and calculated results indicate that the dissolution behavior of SMT-SAC cocrystal form II is a spontaneous,endothermic,and entropy-driven process. | Hongyuan Wei Ningcan Gao Leping Dang | 2021 | Transactions of Tianjin University2021，27，6： | 0 |
| 17 | Visualization of Wormlike Micelle Fluid Flow in a Mixing Tank显示文摘In this study,particle image velocimetry was applied to investigate flow fields of wormlike micelle(WLM) fluids in a mixing tank equipped with a four-blade,down-pumping,pitched blade turbine. First,the rheology of WLM fluids was investigated,and the Carreau model was utilized to describe their apparent viscosity. Then,the effects of the rotation speeds and rheological properties on the flow fields were studied using different WLM fluids at different rotation speeds. The results revealed that with increasing Reynolds number,the discharge angle decreases and the carven size increases. Furthermore,elastic effects of WLM fluids lead to a more curved flow and a smaller carven. | Hongyuan Wei Jieliang Lu Chong Gu Kate Xu Boonho Ng Leping Dang | 2018 | Transactions of Tianjin University2018，24，4： | 0 |
| 18 | Black Phosphorus/Nanocarbons Constructing a Dual-Carbon Conductive Network for High-Performance Sodium-Ion Batteries显示文摘Black phosphorus has been recognized as a prospective candidate anode material for sodium-ion batteries(SIBs)due to its ultrahigh theoretical capacity of 2596 mA·h/g and high electric conductivity of≈300 S/m.However,its large volume expansion and contraction during sodiation/desodiation lead to poor cycling stability.In this work,a BP/graphite nanoparticle/nitrogen-doped multiwalled carbon nanotubes(BP/G/CNTs)composite with a dual-carbon conductive network is successfully fabricated as a promising anode material for SIBs through a simple two-step mechanical milling process.The unique structure can mitigate the eff ect of volume changes and provide additional electron conduction pathways during cycles.Furthermore,the formation of P–O–C bonds helps maintain the intimate connection between phosphorus and carbon,thereby improving the cycling and rate performance.As a result,the BP/G/CNTs composite delivers a high initial Coulombic efficiency(89.6%)and a high specific capacity for SIBs(1791.3 mA·h/g after 100 cycles at 519.2 mA/g and 1665.2 mA·h/g after 100 cycles at 1298 mA/g).Based on these results,the integrated strategy of one-and two-dimensional carbon materials can guide other anode materials for SIBs. | Leping Dang Jiawei He Hongyuan Wei | 2022 | Transactions of Tianjin University2022，28，2： | 0 |
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