Abstract
A rational correlation has previously been established between the particulate removability of disk drive component materials in an aqueous ultrasonic system, and their Hamaker constants modified to reflect their non-elastic deformability. This work expands the scope of both the theory and experiments. A less-restrictive parameter, the surface energy, is used here to correlate with cleanability in a variety of cleaning systems, including water-based and solvent-based ultrasonics, ultrasonics in concert with low-pressure spray, centrifugation, and high pressure water jetting. The fundamental differences in the particle removal characteristics of these systems are highlighted. The influence of the extraction-based measurement procedure on estimated substrate cleanability is pointed out. It is concluded that for non-erodible materials, or for crodible materials cleaned with a non-erosive mechanism, cleanability decreases as surface energy increases. Two exceptions are noted: in ultrasonic cleaning, the tendency of the material to erode limits its cleanability, even if the substrate has very low surface energy; also, some state-of-the-art cleaning methods, such as high pressure water spray, display departiculation efficiencies that are virtually independent of surface energy. Implications of this study for future solvent-free cleaning of disk drive components are discussed throughout the paper.
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Nagarajan, R. (1991). Relevance of Surface Energetics to Departiculation of Disk Drive Substrates. In: Mittal, K.L. (eds) Particles on Surfaces 3. Springer, Boston, MA. https://doi.org/10.1007/978-1-4899-2367-7_1
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DOI: https://doi.org/10.1007/978-1-4899-2367-7_1
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