Actuating Porous Polyimide Films

Title data

Zhang, Yaoming ; Ionov, Leonid:
Actuating Porous Polyimide Films.
In: ACS Applied Materials & Interfaces. Vol. 6 (9 July 2014) Issue 13 . - pp. 10072-10077.
ISSN 1944-8252
DOI: https://doi.org/10.1021/am502492u

Abstract in another language

We report a novel method for the fabrication of one-component self-folding polymer films. The approach is based on films with a vertical gradient of porosity and was demonstrated on an example of porous polyimide films. The inhomogeneous porosity of the films was achieved through the implementation of capillary forces and gravity during the drying of a dispersion of colloidal particles in a solution of polymer precursor. As a result, three-layered films were formed. A monolayer of particles comprises the top layer, the second layer is the pure polymer, and the third layer is formed by a mixture of particles and polymer. Etching out the particles leaves polyimide film with inhomogeneous distributed pores. These porous polymer films roll and form tubes in organic solvents as well as their vapors and reversibly unfold in air. The obtained films were used for design of actuators, which are able to capture and release different objects through the reversible folding.We report a novel method for the fabrication of one-component self-folding polymer films. The approach is based on films with a vertical gradient of porosity and was demonstrated on an example of porous polyimide films. The inhomogeneous porosity of the films was achieved through the implementation of capillary forces and gravity during the drying of a dispersion of colloidal particles in a solution of polymer precursor. As a result, three-layered films were formed. A monolayer of particles comprises the top layer, the second layer is the pure polymer, and the third layer is formed by a mixture of particles and polymer. Etching out the particles leaves polyimide film with inhomogeneous distributed pores. These porous polymer films roll and form tubes in organic solvents as well as their vapors and reversibly unfold in air. The obtained films were used for design of actuators, which are able to capture and release different objects through the reversible folding.

Further data

Item Type:	Article in a journal
Refereed:	Yes
Institutions of the University:	Faculties > Faculty of Engineering Science > Professur Biofabrikation > Professur Biofabrikation - Univ.-Prof. Dr. Leonid Ionov Faculties Faculties > Faculty of Engineering Science Faculties > Faculty of Engineering Science > Professur Biofabrikation
Result of work at the UBT:	Yes
DDC Subjects:	500 Science > 540 Chemistry
Date Deposited:	20 Jun 2017 12:29
Last Modified:	20 Jun 2017 12:29
URI:	https://eref.uni-bayreuth.de/id/eprint/37699