1 / 2

0406656_Lodge

Ion Gels: A New Class of Responsive Polymer Composites Tim Lodge, University of Minnesota, DMR 0406656.

gay-holt
Download Presentation

0406656_Lodge

An Image/Link below is provided (as is) to download presentation Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author. Content is provided to you AS IS for your information and personal use only. Download presentation by click this link. While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server. During download, if you can't get a presentation, the file might be deleted by the publisher.

E N D

Presentation Transcript

  1. Ion Gels: A New Class of Responsive Polymer Composites Tim Lodge, University of Minnesota, DMR 0406656 Ion gels consist of a polymer network swollen with an ionic liquid. These materials have many appealing features, with potential applications in sensors, actuators, membranes, batteries, supercapacitors, and fuel cells. We have demonstrated that well-defined ion gels can be made by direct self-assembly of ABA triblock copolymers, using as little as 5% polymer,while preserving the high ionic conductivity of the ionic liquid [1]. We have recently prepared thermo-reversible ion gels, which can be processed as liquids at high temperature but then solidify on cooling [2]. We have further shown that these gels are extremely promising gate dielectrics in organic thin film transistors, with switching speeds in excess of 10 kHz and very low turn-on voltages [3]. [1]. “Ion Gels by Self-Assembly of a Triblock Copolymer in an Ionic Liquid”, Y. He, P. G. Boswell, P. Bühlmann, and T. P. Lodge, J. Phys. Chem. B.,111, 4645-4652 (2007). [2]. “A Thermoreversible Ion Gel by Triblock Copolymer Self-assembly in an Ionic Liquid”, Y. He and T. P. Lodge, Chem. Commun. 2732-2734 (2007). Also featured in Chem. Technol., 4, T49, (2007). [3]. Ion Gel Gated Polymer Thin-film Transistors”, J. Lee, M. J. Panzer, Y. He, T. P. Lodge, C. D. Frisbie, J. Am. Chem. Soc., 129, 4532 (2007). A thermoreversible gel of poly(N-isopropyl acrylamide)-poly(ethylene oxide)-poly(N-isopropyl acrylamide) in ethyl methyl imidazolium trifluoromethyl sulfonimide. The dynamic moduli measured in a rheometer as a function of temperature show a melting point near 18 ºC. The inset photographs show the ion gel at 5 ºC and the processible liquid at 25 ºC [2].

  2. Broader Impacts: Introducing K-12 Students to Self-Assembly Tim Lodge, University of Minnesota, DMR 0406656 October 20, 2006: 450 kids from “Lego League” visit the U of M for Nanotechnology Day; T. Lodge discusses self-assembly. July 18, 2007: 23 high schoolers learn to make polymers with T. Lodge and M. Hillmyer during “Polymer Day”, part of Exploring Careers in Engineering and Physical Sciences summer camp. June 23, 2007: 100 kids from the Davidson Institute for Talent Development spend a day with MRSEC faculty, organized by T. Lodge; the concluding event was a performance by the Physics Force.

More Related