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Discussion on Hamaker Constant
09 May 2008 | Publications | Contributor(s): Stephen Beaudoin, Ravi Jaiswal, Caitlin Kilroy
The Hamaker constant is a force constant used for describing the van der Waals (vdW) force. The magnitude of the Hamaker constant reflects the strength of the vdW force between two particles, or between a particle and a substrate. It depends on the material properties of both the interacting bodies …
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Basic Forces in Particle Adhesion
28 Jan 2008 | Online Presentations | Contributor(s): Stephen Beaudoin
Particle adhesion to surfaces is important in a wide range of industrial applications. This brief presentation is designed to provide an introduction to the forces that influence particle adhesion in air or liquid environments. It is not designed to provide information at great depth or …
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Particle Adhesion
25 Jan 2008 | Tools | Contributor(s): Stephen Beaudoin, d k, Ravi Jaiswal, Caitlin Kilroy
The van der Waals adhesion force between a particle and a substrate in a given medium is simulated for a specified number of interactions.
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Roughness models for particle adhesion
20 Dec 2007 | Publications | Contributor(s): Stephen Beaudoin, Ravi Jaiswal, Caitlin Kilroy
The effects of different surface roughness models on a previously developed van der Waals adhesion model were examined. The van der Waals adhesion model represented surface roughness with a distribution of asperities. It was found that the constraints used to
define the asperity distribution on …
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Simulation of the Adhesion of Particles to Surfaces
20 Dec 2007 | Publications | Contributor(s): Stephen Beaudoin, Ravi Jaiswal, Caitlin Kilroy
The removal of micrometer and submicrometer particles from
dielectric and metal films represents a challenge in postchemical
mechanical polishing cleaning. Proper modeling of the adhesive
force between contaminant particles and these films is needed to
develop optimal solutions to postchemical …
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Hamaker Constants in Integrated Circuit Metallization
20 Dec 2007 | Publications | Contributor(s): Stephen Beaudoin, Ravi Jaiswal, Caitlin Kilroy
A new method for determining Hamaker constants was examined
for materials of interest in integrated circuit manufacture. An
ultra-high vacuum atomic force microscope and an atomic force microscope
operated in a nitrogen environment were used to measure
the interaction forces between metals, …
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A Theoretical and Experimental Study of Surface Forces in Adhesion of Particles to Thin Films
20 Dec 2007 | Publications | Contributor(s): Stephen Beaudoin, Ravi Jaiswal, Caitlin Kilroy
The interactions between micron- and nano-particles and rough surfaces are of great importance and have numerous applications in surface science and biotechnology. It is essential to have estimates of surface/intermolecular forces between interacting bodies to describe and to manipulate the nature …
The adhesion of micron and sub-micron scale particles to surfaces is of tremendous interest in a wide range of industrial and civilian applications. We measure directly the adhesion of particles to surfaces using atomic force microscopy and develop experimentally-validated, science-based models for the adhesion. The models consider electrostatic, van der Waals, and hydrophobic interactions for rough, deformable particles with nonuniform geometry adhering to rough deformable surfaces in liquid, gaseous, or vacuum environments.