A new method is proposed for analyzing the adhesion force between a single microparticle and a solid surface in air. The method is based on the μN radiation force that is exerted on a particle by nanosecond pulsed laser light, which pulls a particle from a transparent solid surface against the adhesion force. The strength of the force is determined on the basis of the Mie scattering theory with the critical laser intensity at which the radiation pressure and the adhesion force are balanced. This optical force measurement has the advantages of no mechanical contact, of applicability to micro approximately nanometer-sized particles and of causing no perturbations on the physical and chemical conditions of a sample. The high potential of this method is clearly demonstrated in the analysis of the adhesion force between polymer latexes and glass surfaces.
|Journal||Japanese Journal of Applied Physics, Part 2: Letters|
|Issue number||6 A|
|State||Published - 1 Jun 1997|