Superhydrophilic and water-capturing surfaces

摘要

A coated substrate includes a substrate and a coating containing a water insoluble polymer and a water soluble polymer, the two polymers, due to different water affinity, forming a nanosegregant on the substrate. Also disclosed are a method of preparing the above-described coated substrate and the use of this coated substrate in a solid-state supercapacitor.

主权项

1. A coated substrate comprising:
a coating that includes a water insoluble polymer and a water soluble polymer; and a substrate covered by the coating, wherein the water insoluble polymer is poly(3,4-ethelynedioxythiophene) (“PEDT”), and the water soluble polymer is poly(styrene sulfonic acid) (“PSSH”), the coated substrate is prepared by a method including the following steps: providing an aqueous dispersion containing PEDT and PSSH, applying the aqueous dispersion onto a surface of a substrate, and allowing the applied aqueous dispersion to dry to form, due to different water affinities of the two polymers, on the surface of the substrate a nanosegregant having a thickness of 1-10 nm capable of capturing a water film having a thickness of 0.1-10 mm, wherein the nanosegregant includes a water-insoluble layer containing both PEDT and PSSH and a water-soluble layer also containing both PEDT and PSSH.