Abstract

Much is known about the atomic/molecular theories that govern adhesion as well as the macroscopic aspects and properties of adhesion. However, adhesion in the microparticle regime is poorly characterized. We report on experiments that use centrifugal force to remove polystyrene (PS) particles from the surface of a high-speed titanium rotor operated in vacuum. This unique rotor can apply forces far greater than other centrifugal force methods or related techniques using atomic force spectroscopy. The mode of attachment, whether particles were located on the windward side versus leeward side of the spinning rotor, time spent in vacuum prior to experiments, and surface imperfections all showed an effect on adhesion. Our observations show initial agreement with published results from atomic force spectroscopy experiments. We conclude that the liquid used to help suspend and apply the PS particles greatly influences the total adhesive forces present in the system. This in turn provides valuable clues as to the nature of the adhesive interaction.

Degree

College and Department

Physical and Mathematical Sciences; Chemistry and Biochemistry

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