A multiple contact adhesion model has been derived to explain the charge observed on silica dust. This model has good agreement with the observed adhesion of microspheres and microballoons. From theoretical arguments, it appeared feasible that surface acoustic waves could be used to overcome the electrostatic adhesion between a particle and surface, and be used to move the particle along the surface in a controllable fashion. In an inverted geometry, evidence for resonance in the hollow microballoons was found. Two distinct modes were observed. These were the breathing mode and the Lamb wave mode associated with resonance of the walls. …
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Rockwell International Corp., Canoga Park, CA (USA). Rocketdyne Div.
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Canoga Park, California
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A multiple contact adhesion model has been derived to explain the charge observed on silica dust. This model has good agreement with the observed adhesion of microspheres and microballoons. From theoretical arguments, it appeared feasible that surface acoustic waves could be used to overcome the electrostatic adhesion between a particle and surface, and be used to move the particle along the surface in a controllable fashion. In an inverted geometry, evidence for resonance in the hollow microballoons was found. Two distinct modes were observed. These were the breathing mode and the Lamb wave mode associated with resonance of the walls. The measured Lamb wave velocity was 6.15 x 10/sup 5/ cm/sec.
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