Self-Assembly of Pillars Modified with Vapor Deposited Polymer Coatings

摘要

In this paper, we demonstrate that thin layers of polymer coatings can be used to self-assemble pillars into stable microstructures. Polymer coatings are deposited onto elastomeric pillars using solvendess initiated chemical vapor deposition and capillary forces are used to collapse the coated pillars into micro-structures. The location of pillar collapse can be controEed by patterning regions of hydrophilicity and hydrophobicity. Poly-(hydroxyethyl methacrylate) and poly(methacrylic acid) coatings stabilize the self-assembled microstructures by providing an ad-hesive force through solvent bonding. These solvent bonds allow the response of the microstructures to be tuned by varying the thickness of the polymer coating and the solubility parameter of the solvent The coating process described in this paper is substrate-independent and therefore can be applied to pillars composed of any material.