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  • Title: X-ray diffraction method for the investigation of contacts between solid surfaces.
    Author: Keymeulen HR, Lackner T, Diaz A, Patterson BD, van der Veen JF.
    Journal: J Synchrotron Radiat; 2005 Jul; 12(Pt 4):484-7. PubMed ID: 15968126.
    Abstract:
    A coherent X-ray scattering method for investigating the formation of the contact region between two solid surfaces is presented. Diffraction of X-rays from two crossed cylindrical quartz surfaces, coated with Cr and TiO(2), revealed a total contact area of 90 +/- 10 microm. In the so-called Hertz model for two surfaces in non-adhesive contact, this value is directly related to the displacement of the surfaces and the applied external force. Values of 40 +/- 3 nm for the displacement and 24 +/- 3 mN for the force are found. The method is also useful for studying liquids in confinement.
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