Method and system for treating a surface

1. A method of applying a treatment to a surface of an open body having a volume within an interior of the open body, the method comprising:

providing an inner structure shaped to complement the shape of the interior of the open body and to fill a major portion of the volume or a major portion of a width of the interior of the open body;

positioning the inner structure within the open body in order to form a treatment fluid inner volume comprising an inner space confronting an inner surface within the interior of the open body; and

introducing a treatment fluid into the treatment fluid inner volume to thereby modify the inner surface of the open body by applying the treatment fluid thereto,

wherein applying the treatment fluid comprises applying a plasma,

and wherein the plasma is generated using the open body as an electrode.

2. The method as claimed in claim 1 , wherein the inner structure is inflatable, and wherein the step of positioning the inner structure comprises inflating the inner structure.

3. The method as claimed in claim 1 , wherein the inner structure is rigid, and therefore not inflatable.

4. The method as claimed in claim 1 , comprising:

providing a tank shaped to complement and contain the open body;

positioning the open body within the tank in order to form a treatment fluid outer volume comprising an outer space confronting the outer surface of the open body; and

introducing the treatment fluid into the treatment fluid outer volume to thereby modify the outer surface of the open body by applying the treatment.

5. The method as claimed in claim 4 , wherein the tank is arranged such that the treatment fluid outer volume spans less than 20% of the width of the interior of the tank, and the outer space is sized accordingly.

6. The method as claimed claim 4 , wherein the plasma is generated using either the inner structure or the tank as the other electrode.

7. The method as claimed in claim 1 , wherein applying the treatment comprises coating, cleaning, or functionalizing the surface of the open body.

8. The method as claimed in claim 1 , comprising applying ultrasonic waves and/or heat to the treatment fluid and/or open body; and/or

comprising centrifugation and/or compression of the treatment fluid.

9. The method as claimed in claim 1 , comprising applying ultraviolet (UV) radiation to the treatment fluid applied to the surface of the open body whilst the treatment fluid is present or after removal of the treatment fluid.

10. The method as claimed in claim 1 , comprising aiding the introduction and/or removal of the treatment fluid by application of vacuum to the treatment fluid volume; and/or comprising aiding the introduction and/or removal of the treatment fluid by application of a high pressure fluid to the treatment fluid volume, and/or by spinning of the open body.

11. The method as claimed in claim 1 , wherein the inner structure includes retractable brushes for brushing the inner surface of the open body and the method includes cleaning the inner surface using the brushes.

12. The method as claimed in claim 1 , wherein the inner structure includes nozzles for applying a fluid to the inner surface of the open body.

13. The method as claimed in claim 1 , comprising using an electrochemical action and/or a plasma to clean, functionalize or coat the open body.

14. The method as claimed in claim 1 , wherein the inner structure is arranged such that the treatment fluid inner volume spans less than 20% of the width of the interior of the open body, and the inner space is sized accordingly; and/or wherein the treatment fluid is a first treatment fluid, the method comprising introducing a second fluid to the treatment volume and applying the second treatment fluid to the surface of the open body.