Structural and Mechanical Properties of Nanopowders

纳米粉末的结构和机械性能

• 批准号: 184017420
• 负责人: Professor Dr. Thorsten Pöschel
• 金额: --
• 依托单位: Lehrstuhl für Multiscale Simulation of Particulate Systems (MSS)
• 依托单位国家: 德国
• 项目类别: Research Grants
• 财政年份: 2011
• 资助国家: 德国
• 起止时间: 2010-12-31 至 2013-12-31
• 项目状态: 已结题
• 来源: https://gepris.dfg.de/gepris/projekt/184017420?language=en
• 关键词: Structural; Mechanical; Properties; Nanopowders

Nanopowders are granular systems of nanometer-sized particles whose short range interaction is dominated by strong adhesive van-der-Waals forces. These attractive forces are the reason why nano-particles agglomerate into ramified structures forming micrometer-sized flakes. On a macroscopic scale, nanopowders appear to be homogeneous while on a microscopic scale they reveal a fractal structure.The aims of this research project arei) to develop numerical methods for the simulation of the asymptotic structure of nanopowders, as it evolves in repeated break and deposition processes ii) to characterize the structural properties of nanopowders based on large-scale numerical simulations in 3d (for certain aspects also in 2d), including fractal properties, anisotropy etc. In particular the influence of volume and surface properties of nano particles such as polarity, charges, wetting, adsorbates as well as the properties of the solvent shall be addressed.iii) to investigate the macroscopic properties of nanopowders, such as constitutive relations, yield behavior, impact-damping properties, and sound transmission iv) to explain the statistical properties of nano-powders such as contactforce statistics and fractal properties of the bulk and surface.

纳米粉末是由纳米粒子组成的颗粒状系统，它们的短程相互作用主要受强大的粘附力范德华作用力的支配。这些吸引力是纳米颗粒聚集成分叉结构形成微米大小的薄片的原因。在宏观尺度上，纳米粉末似乎是均匀的，而在微观尺度上，它们呈现出分形结构。本研究项目的目的是开发数值方法来模拟纳米粉末的渐近结构，因为它在重复的破碎和沉积过程中演变。ii)基于3D(对于某些方面也在2D中)的大规模数值模拟来表征纳米粉末的结构特性，包括分形特性、各向异性等。尤其是纳米颗粒的体积和表面特性的影响，例如极性、电荷、润湿、吸附以及溶剂的特性。iii)为了研究纳米粉末的宏观特性，如本构关系、屈服行为、冲击减振性能、声传输等)来解释纳米粉末的统计特性，如接触力统计和块体和表面的分形特性。

项目成果

Nonuniformities in the angle of repose and packing fraction of large heaps of particles.

大颗粒堆的休止角和堆积分数的不均匀性

• DOI: 10.1103/physrevlett.109.128001
• 发表时间: 2012
• 期刊: Physical review letters
• 影响因子: 8.6
• 作者: Nikola Topić;Jason A. C. Gallas;Thorsten Pöschel
• 通讯作者: Thorsten Pöschel

The microscopic structure of mono-disperse granular heaps and sediments of particles on inclined surfaces.

• DOI: 10.1039/c5sm03114a
• 发表时间: 2016-03
• 期刊: Soft matter
• 影响因子: 3.4
• 作者: N. Topic;F. Schaller;G. Schröder-Turk;T. Pöschel

Steepest descent ballistic deposition of complex shaped particles

复杂形状颗粒的最速下降弹道沉积

• DOI: 10.1016/j.jcp.2015.12.052
• 发表时间: 2016
• 期刊: J. Comput. Phys.
• 作者: Nikola Topić;Thorsten Pöschel
• 通讯作者: Thorsten Pöschel

Shear flow of cohesive powders with contact crystallization: experiment, model and calibration

• DOI: 10.1007/s10035-015-0555-3
• 发表时间: 2015-03
• 期刊: Granular Matter
• 影响因子: 2.4
• 作者: A. Weuster;S. Strege;L. Brendel;H. Zetzener;D. Wolf;A. Kwade

Structure of a three-dimensional nano-powder subjected to repeated fragmentation and sedimentation

• DOI: 10.1088/1367-2630/17/1/013024
• 发表时间: 2015
• 期刊: New Journal of Physics
• 影响因子: 3.3
• 作者: N. Topic;A. Weuster;T. Pöschel;D. Wolf