On the Adhesion between Individual Particles

KONA Powder and Particle Journal

Michael Kappl¹  Hans-Jürgen Butt¹  Marcin Makowski¹  Arkadiusz Ptak² 

[1] Max Planck Institute for Polymer Research;Poznan University of Technology, Institute ofPhysics;

关键词: granular matter;    powder particles;    capillary force;    surface energy;    work of adhesion;    dynamic force spectroscopy;    polymer;    bridging adhesion;   

DOI  :  10.14356/kona.2011009

来源: DOAJ

【 摘 要 】

A dream in powder technology is to predict the structure and flow of a powderfrom precise knowledge of the interactions between the particles. The mostimportant interaction is adhesion. In this paper several aspects of adhesion arediscussed. First, the influence of humidity and capillary forces is analyzed. Tocalculate capillary forces the structure of the microcontact needs to be knownwith an accuracy much better than 1 nm. Determining the structure of amicrocontact with such resolution is demanding, if possible at all. Consideringthat wear can lead to a change of the atomic structure such knowledge ispractically impossible. Second, the work to break an adhesive contact depends onthe effective spring constant by which the force is applied. Third, adhesionforces depend on the separation speed and not only the surface chemistry and thestructure of the particles in the contact region. Fourth, we suggest todistinguish between contact and bridging adhesion.

【 授权许可】

Unknown