Method to prepare superhydrophobic surfaces on solid bodies by rapid expansion solutions.

摘要

The present invention refers to a method for preparing a superhydrophobic
surface on a solid substrate comprising
the steps of (a) providing a solvent in the form of a pressurized fluid in a
vessel, wherein the fluid exhibits a decrease in solvency
power with decreasing pressure; (b) adding a hydrophobic substance to the
solvent as a solute, which substance is soluble with the
pressurized fluid and has the ability to crystallize/precipitate after
expansion of the fluid, thereby obtaining a solution of the solvent
and the solute in the vessel; (c) having at least one orifice opened on the
vessel, thereby causing the pressurized solution to flow
out of the vessel and depressurize in ambient air or in an expansion chamber
having a lower pressure than within the vessel, the
solute thereby forming particles; and (d) depositing the particles on the
substrate in order to obtain a superhydrophobic surface.
Hereby, a pressurized fluid which expands rapidly as a result of
depressurization is used to prepare the superhydrophobic surface,
thereby facilitating the preparation of the surface. Moreover, the invention
refers to an arrangement for preparing a superhydrophobic
surface on a substrate, a superhydrophobic film prepared by the method of the
invention, and a substrate having deposited thereon
the superhydrophobic firm.