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Your search keyword '"Haowen Zheng"' showing total 4 results
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4 results on '"Haowen Zheng"'

1. The establishment of the normal contact force model for a one‐dimensional sphere chain subjected to impact load

Author

Jun Liu, Futian Zhao, Zhimin Xiao, Yue Wang, Zheng Liu, and Haowen Zheng

Subjects
discrete element method, experiment and simulation, normal contact force, one‐dimensional sphere chain, Mechanical engineering and machinery, TJ1-1570, Systems engineering, TA168
Abstract

Abstract The normal contact force determines the behavior of a particle system. To investigate the normal contact force in a one‐dimensional sphere chain subjected to impact load, by comparing the simulation results of the existing typical normal contact force models embedded in the discrete element program, an improved normal contact force model was proposed in this paper. The improved model consists of two parts: the Cundall model for loading and the Daniel model for unloading. Moreover, a systematic test was designed to verify the accuracy and applicability of the improved model. The results showed that the calculated contact force curves agree well with the experimental results. Furthermore, the improved model is implemented in the solution algorithm without need for complex numerical methods and parameters fitting, leading to more efficient simulations.

Published
2022
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3. Nanostructures: Solvothermal Synthesis of Alloyed PtNi Colloidal Nanocrystal Clusters (CNCs) with Enhanced Catalytic Activity for Methanol Oxidation (Adv. Funct. Mater. 1/2018)

Author

Haowen Zheng, Lei Chen, Muhan Cao, Qiao Zhang, Huicheng Hu, Yilin Liu, Yanguang Li, Yong Xu, Peipei Yang, Yulin Min, Di Yang, and Xiaolei Yuan

Subjects
Nanostructure, Materials science, Solvothermal synthesis, chemistry.chemical_element, 02 engineering and technology, 010402 general chemistry, 021001 nanoscience & nanotechnology, Condensed Matter Physics, 01 natural sciences, 0104 chemical sciences, Electronic, Optical and Magnetic Materials, Catalysis, Biomaterials, Colloid, chemistry.chemical_compound, Nickel, Nanocrystal, Chemical engineering, chemistry, Electrochemistry, Methanol, 0210 nano-technology
Published
2018

4. Solvothermal Synthesis of Alloyed PtNi Colloidal Nanocrystal Clusters (CNCs) with Enhanced Catalytic Activity for Methanol Oxidation

Author

Yanguang Li, Huicheng Hu, Xiaolei Yuan, Yong Xu, Yilin Liu, Muhan Cao, Lei Chen, Haowen Zheng, Peipei Yang, Di Yang, Qiao Zhang, and Yulin Min

Subjects
Materials science, Solvothermal synthesis, Inorganic chemistry, chemistry.chemical_element, 02 engineering and technology, 010402 general chemistry, 01 natural sciences, Homogeneous distribution, Catalysis, Biomaterials, Metal, chemistry.chemical_compound, Colloid, Electrochemistry, 021001 nanoscience & nanotechnology, Condensed Matter Physics, 0104 chemical sciences, Electronic, Optical and Magnetic Materials, Nickel, chemistry, Nanocrystal, Chemical engineering, visual_art, visual_art.visual_art_medium, Methanol, 0210 nano-technology
Abstract

Colloidal nanocrystal clusters (CNCs), which are composed of many nanocrystal subunits, have attracted intensive attention because they can possess not only the properties of each single subunit but also the collective properties and novel functionalities resulting from the ensembles. However, to date, the successful preparation of metal CNCs has rarely been reported. In this work, a simple one-pot solvothermal method is developed to prepare PtNi-alloyed CNCs with homogeneous distribution of Pt and Ni elements, porous feature, and interconnected steady framework. The PtNi CNCs are composed of many PtNi nanocrystals with size around 7–8 nm. Their growth mechanism is proposed through a systematic study. Thanks to the unique structure, the as-prepared PtNi CNCs show better catalytic performance in methanol oxidation reaction than that of PtNi nanocrystals and Pt/C catalysts. This work is important because it not only provides a new method for the preparation of metal CNCs with desired morphology and properties, but also paves the way for practical applications of metal nanoparticles.

Published
2017

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