| Article ID | Journal | Published Year | Pages | File Type |
|---|---|---|---|---|
| 593857 | Colloids and Surfaces A: Physicochemical and Engineering Aspects | 2013 | 5 Pages |
The viscosity of thin films of liquid poly(dimethylsiloxane) have been studied on silicon and fluoropolymer-coated silicon by means of a perturbation technique applied using colloid probe atomic force microscopy. The liquid film supported by a silicon substrate exhibited a greater viscosity than the bulk liquid, due to the strong interaction between the molecules near to the liquid/solid interface. In comparison, the liquid film supported by a fluoropolymer-coated substrate exhibited a similar viscosity to the bulk liquid, due to the weak interaction between the liquid and the fluoropolymer surface. This demonstrates the possibility to control the viscosity of thin liquid films via selection of the substrate chemical properties.
Graphical abstractFigure optionsDownload full-size imageDownload as PowerPoint slideHighlights► Thin films of spin-deposited silicone fluids. ► Silicon and fluoropolymer-coated silicon substrates. ► Perturbation applied to film using colloid probe atomic force microscopy. ► Film viscosity estimated from time required for recovery of the perturbation. ► Thin film viscosities can be controlled via selection of substrate surface chemistry.
