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- W2218884625 abstract "The atomic force microscope has been used to quantitatively measure the effects of a lubricant coating on the adhesion and friction between silica surfaces. The lubricant used was a covalently bound monolayer of metal stearates. It was found to dramatically decrease the adhesion between the surfaces, but had no effect on the measured coefficient of friction. However, at the high applied stresses used, which ranged up to 100 MPa, the lubricant coating was found to be worn away. Friction experiments were also conducted on both hydrophobic and hydrophilic silica surfaces and the surface chemistry was found to play a major role in the measured fictional response. The hydrophobic surfaces displayed a typical Amonton type frictional behaviour in which the friction was proportional to applied load. The hydrophilic surfaces initially displayed the same response as the load was increased from zero to the maximum applied load. However, with subsequent testing over the same wear track, the data showed a JKR type response. This shows that the friction mechanism had changed, to 'point contact' sliding, in which the apparent and real areas of interaction coincide. On the surface of hydrophilic silica, there is a soft, gel-like layer of intertwined polymeric chains of -Si(OH){2}-O-Si(OH){2}-OH. The local surface stresses were large enough to smear out any surface irregularities in this gel, changing the contact from multi-asperity, to a single interfacial region of contact." @default.
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- W2218884625 date "1998-01-01" @default.
- W2218884625 modified "2023-09-24" @default.
- W2218884625 title "Atomic Force Microscopy Study of the Adhesion and Friction between Lubricated and Unlubricated Silica Surfaces" @default.
- W2218884625 hasPublicationYear "1998" @default.
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