A Surface Force Apparatus has been used to investigate the drainage of a blend of copolymer viscosity improver additive molecules in a base oil. A quasi-static squeeze of the interface is used to characterize the first repulsion layer and the confined adsorbed layer. Moreover, dynamical measurements enlighten a significant negative value of the immobile layer thickness (−50 nm). The occurrence of slip at the wall that may result in such effect, is discussed in terms of liquid-solid interface wettability, surface roughness and cleanliness, and friction experiments. As a consequence, a modeling of the interface consisting of two layers of different viscosity is proposed. This model of interfacial molecular organization allows us to explain the drainage behaviour of the wetting liquid.
- Tribology Division
Drainage of a Wetting Liquid: Slip Effect or Molecularly Organised Layers?
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Cayer-Barrioz, J, Tonck, A, Mazuyer, D, & Yamaguchi, E. "Drainage of a Wetting Liquid: Slip Effect or Molecularly Organised Layers?." Proceedings of the ASME/STLE 2007 International Joint Tribology Conference. ASME/STLE 2007 International Joint Tribology Conference, Parts A and B. San Diego, California, USA. October 22–24, 2007. pp. 861-863. ASME. https://doi.org/10.1115/IJTC2007-44273
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