Fluid control films with hydrophilic surfaces, methods of making same, and processes for cleaning structured surfaces

A process for forming a fluid control film, comprising:

• continuously bringing a flowable material and a molding surface of a molding tool into line contact with each other;
• forming a plurality of microchannels within the flowable material;
• solidifying the flowable material to form an elongated fluid control film, the fluid control film having a length along a longitudinal axis and a width, the length being greater than the width, wherein the microchannels are formed along a channel longitudinal axis;
• and
• covalently bonding a hydrophilic surface treatment to at least a portion of a surface of the microchannels, the hydrophilic surface treatment comprising functional groups selected from a non-zwitterionic sulfonate, a non-zwitterionic carboxylate, a zwitterionic sulfonate, a zwitterionic carboxylate, a zwitterionic phosphate, a zwitterionic phosphonic acid, a zwitterionic phosphonate, or a combination thereof.

A process for cleaning a structured surface, comprising:

• providing a structured surface and a hydrophilic surface treatment covalently bonded to at least a portion of the structured surface;
• soiling the structured surface with a material;
• and
• removing the material by at least one of submerging the structured surface in an aqueous fluid, rinsing the structured surface with an aqueous fluid, condensing an aqueous fluid on the structure surface, or wiping the structured surface with a cleaning implement;
• wherein at least 50% of a 2-dimensional projected area of the structured surface is free of the material.