Method for coating a surface of a component
The invention relates to a method for coating a surface ( 44 ), in particular a microstructured surface, of a component ( 55 ) comprising different materials, in particular glass and silicon, wherein the surface ( 44 ) is first activated and then coated, wherein an oxidising solution, a basic solution or an acid-oxidising solution is used to activate the surface ( 44 ).
1. A method for preparing a nebulizer, the method comprising: coating a microstructured surface within a component comprising glass and silicon, wherein the component consists of a plate of glass and a plate of silicon firmly joined together and at least one of the plates has one or more microstructured channels,
wherein the surface is first activated and then coated, characterized in that:
an oxidizing solution, a basic solution or an acid-oxidizing solution is used to activate the surface,
before the activation the surface is cleaned, and
coating the surface comprises:
applying a reaction solution to coat the microstructured channels, the reaction solution comprising functional silanes in non-polar, aprotic or polar-protic solvents, and
treating the microstructured surface with ultrasound during application of the reaction solution, wherein the ultrasound treatment causes flow of the reaction solution into the microstructured channels; and incorporating the component into a medical device configured to nebulize a liquid medicament passed through the one or more microstructured channels.
2. The method according to claim 1 , characterized in that the coated component is washed.
3. The method according to claim 1 , wherein the oxidizing solution which is used for activating the surface is a solution consisting of water, ammonia solution, containing 25% ammonia, and hydrogen peroxide solution, containing 30% hydrogen peroxide, in the ratio 5:1:1.
4. The method according to claim 1 , wherein a piranha solution is used as an acid-oxidizing solution for activating the surface.
5. The method according to claim 1 , wherein before the activation the surface is cleaned using isopropanol and water.
6. The method according to claim 1 , wherein for coating the surface, perfluoroalkylsilanes or alkylsilanes are used.
7. The method according to claim 6 , wherein for coating the surface perfluoroalkl silanes or trialkoxysilanes are used.
8. The method according to claim 1 , wherein for coating the surface, trihalosilanes, monohalodimethylsilanes or trialkoxysilanes are used.
9. The method according to claim 8 , wherein dimethylmonochlorosilanes in dry non-polar, aprotic solvents are used for coating.
10. The method according to claim 9 , wherein for coating the component is immersed in a solution of dimethylmonochlorosilanes and then dried in a nitrogen current.
11. The method according to claim 8 , wherein a solution of trialkoxysilanes is used for coating.
12. The method according to claim 11 , wherein a 0.1 to 1% solution of functional triethoxysilanes in 2-ropanol/water/hydrochloric acid is stirred for about five hours and the component with its activated surfaces is then immersed in the solution.
13. The method according to claim 11 , wherein after the component has been taken out of the solution, the excess solution is removed from the component by allowing it to drip.
14. The method according to claim 11 , wherein the trialkoxysilanes used are trimethoxysilanes or triethoxysilanes.
15. The method according to claim 1 , wherein after the coating the component is heat-treated.
16. The method according to claim 15 , wherein after the coating the component is heat-treated for 1 to 2 hours at 120° C.
17. The method according to claim 1 , wherein the reaction solution forms a coating layer on the one or more microstructured channels, and wherein the coating layer inhibits accumulation of a liquid medicament within the one or more microstructured channels.