London-van der Waals adhesiveness of rough particles

Li, Q., Rudolph, V. and Peukert, W. (2006) London-van der Waals adhesiveness of rough particles. Powder Technology, 161 3: 248-255. doi:10.1016/j.powtec.2005.10.012


Author Li, Q.
Rudolph, V.
Peukert, W.
Title London-van der Waals adhesiveness of rough particles
Journal name Powder Technology   Check publisher's open access policy
ISSN 0032-5910
Publication date 2006-02
Sub-type Article (original research)
DOI 10.1016/j.powtec.2005.10.012
Volume 161
Issue 3
Start page 248
End page 255
Total pages 8
Editor J. P. K. Seville
Place of publication Lausanne
Publisher Elsevier Science Sa
Collection year 2006
Language eng
Subject C1
290699 Chemical Engineering not elsewhere classified
779999 Other
Abstract Van der Waals forces often dominate interactions and adhesion between fine particles and, in turn, decisively influence the bulk behaviour of powders. However, so far there is no effective means to characterize the adhesive behaviour of such particles. A complication is that most powder particles have rough surfaces, and it is the asperities on the surfaces that touch, confounding the actual surface that is in contact. Conventional approaches using surface energy provide limited information regarding adhesion, and pull-off forces measured through atomic force microscope (AFM) are highly variable and difficult to interpret. In this paper we develop a model which combines the Rumpf-Rabinovich and the JKR-DMT theories to account simultaneously for the effects of surface roughness and deformation on adhesion. This is applied to a 'characteristic asperity' which may be easily obtained from AFM measurements. The concept of adhesiveness, a material property reflecting the influences of elastic deformability, surface roughness, and interfacial surface energy, is introduced as an efficient and quantitative measure of the adhering tendency of a powder. Furthermore, a novel concept of specific adhesiveness is proposed as a convenient tool for characterizing and benchmarking solid materials. This paper provides an example to illustrate the use of the proposed theories. (c) 2005 Elsevier B.V. All rights reserved.
Keyword adhesion
van der Waals force
effective contact area
adhesiveness
specific adhesiveness
fine particles
Surface-roughness
Elastic Solids
Adhesion
Forces
Contact
Q-Index Code C1

 
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Created: Wed, 15 Aug 2007, 08:54:13 EST