Direct Laser Writing of Photoresponsive Colloids for Microscale Patterning of 3D Porous Structures

Authors

  • Matthew C. George,

    1. Department of Materials Science and Engineering Frederick Seitz Materials Research Laboratory Beckman Institute University of Illinois at Urbana-Champaign Urbana, IL 61801 (USA)
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  • Ali Mohraz,

    1. Department of Materials Science and Engineering Frederick Seitz Materials Research Laboratory Beckman Institute University of Illinois at Urbana-Champaign Urbana, IL 61801 (USA)
    2. Present Address: Department of Chemical Engineering and Materials Science, University of California, Irvine, CA, USA
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  • Martin Piech,

    1. Electronic and Nanostructured Materials Sandia National Laboratories, P.O. Box 5800-1411 Albuquerque, New Mexico 87185 (USA)
    2. Present Address: United Technologies Research Center, East Hartford, CT 06108, USA
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  • Nelson S. Bell,

    1. Electronic and Nanostructured Materials Sandia National Laboratories, P.O. Box 5800-1411 Albuquerque, New Mexico 87185 (USA)
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  • Jennifer A. Lewis,

    1. Department of Materials Science and Engineering Frederick Seitz Materials Research Laboratory Beckman Institute University of Illinois at Urbana-Champaign Urbana, IL 61801 (USA)
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  • Paul V. Braun

    Corresponding author
    1. Department of Materials Science and Engineering Frederick Seitz Materials Research Laboratory Beckman Institute University of Illinois at Urbana-Champaign Urbana, IL 61801 (USA)
    • Department of Materials Science and Engineering Frederick Seitz Materials Research Laboratory Beckman Institute University of Illinois at Urbana-Champaign Urbana, IL 61801 (USA).
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  • We thank Greg Jamison and Timothy Long for their work in developing the synthetic routes for the spirobenzopyran compounds, and Alex Jerez for helping prepare the 3D renderings in Maya. This work has been carried out within the Microscopy Suite and the Visualization, Imaging, and Media Laboratory at the Beckman Institute for Advanced Science and Technology at the University of Illinois at Urbana-Champaign (UIUC) and within Sandia National Laboratories, Albuquerque, New Mexico. The UIUC component of this work is supported by the US Department of Energy, Division of Materials Sciences, under Award no. DE-FG02-07ER46471, through the Frederick Seitz Materials Research Laboratory at UIUC. Sandia funding was derived from the Center for Integrated Nanotechnology (CINT) and Sandia National Laboratory LDRD Program. Sandia is a multiprogram laboratory operated by Sandia Corporation, a Lockheed Martin Company, for the United States Department of Energy's National Nuclear Security Administration under contract DE-AC04-94AL85000. Supporting Information is available online from Wiley InterScience or from the author.

Abstract

original image

3D patterning of colloidal structures is enabled by the phototriggered aggregation of photoresponsive colloids. We use direct laser writing to locally control aggregation behavior of photoresponsive colloids via a 2-photon absorption process. 3D structures composed of porous walls are harvested after rinsing away unexposed colloidal species. Aggregation is fully reversible with sufficient agitation.

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