Scaling and hierarhical structure of cohesive agglomerates of nanoparticles

Leon M. Keer*, Feodor M. Borodich, Binoy M. Shah

*Corresponding author for this work

Research output: Chapter in Book/Report/Conference proceedingConference contribution

1 Scopus citations

Abstract

Aggregation of dry cohesive powders and dissipation of energy during loading of the aggregates are under consideration. Under the influence of interparticle adhesion, fine particles of the powders cluster together to form simple agglomerates. The simple agglomerates adhere together to form larger, complex agglomerates, which in turn, may adhere together and form a hierarchical structure. It is shown that contrary to diffusion-limited colloid aggregation, the simple agglomerates consisting of alumna or titanium dioxide particles are not mass fractals. The core structure of the simple agglomerates is described as a non-ordered homogeneous structure with a constant volume fraction, while the outer part (shell) can be considered as a rough surface that may have quite extended protuberances. It is shown that the total energy dissipated during relative motion between simple agglomerates depends on the amount of the primary cycles - "jump into contact - pull off" between cohesive particles. Finally, the specific properties of cohesive powder dampers are discussed.

Original languageEnglish (US)
Title of host publicationIUTAM Symposium on Scaling in Solid Mechanics - Proceedings of the IUTAM Symposium
PublisherSpringer Verlag
Pages287-297
Number of pages11
ISBN (Print)9781402090325
DOIs
StatePublished - 2009
EventIUTAM Symposium on Scaling in Solid Mechanics - Cardiff, United Kingdom
Duration: Jun 25 2007Jun 29 2007

Publication series

NameSolid Mechanics and its Applications
Volume10
ISSN (Print)1875-3507

Other

OtherIUTAM Symposium on Scaling in Solid Mechanics
CountryUnited Kingdom
CityCardiff
Period6/25/076/29/07

Keywords

  • Agglomeration
  • Cohesive nanoparticles
  • Energy dissipation
  • Hierarchal structure

ASJC Scopus subject areas

  • Civil and Structural Engineering
  • Automotive Engineering
  • Aerospace Engineering
  • Acoustics and Ultrasonics
  • Mechanical Engineering

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