Beyond Thin Films: Manufacturing Layer-by-Layer Assembled Composites into Tunable Architectures.

Nanocomposites;Layer by Layer Assembly;Advanced Manufacturing;Chemical Engineering;Engineering;Chemical Engineering

Andres, Christine M.Gulari, Erdogan ;

University of Michigan

关键词: Nanocomposites;    Layer by Layer Assembly;    Advanced Manufacturing;    Chemical Engineering;    Engineering;    Chemical Engineering;   

Others  :  https://deepblue.lib.umich.edu/bitstream/handle/2027.42/97876/cmstine_1.pdf?sequence=1&isAllowed=y

瑞士|英语

来源: The Illinois Digital Environment for Access to Learning and Scholarship

【 摘 要 】

Materials with enhanced performance and unique property combinations provide promising solutions to our challenges in clean energy, national security and human welfare. As material properties emerge from both chemical and structural features, independent structural control across multiple length scales enables the realization of novel materials. Layer by layer (LBL) assembly provides nanoscale structural control for the fabrication of polymer-nanocomposites with exceptional material properties. However, the planar deposition technique limits the incorporation of alternative structural features as is required for advanced applications. Here several approaches to introduce multi-dimensional and multiscale architectures to LBL assembled nanocomposites are developed with an emphasis on sustainability and versatility.First, inkjet technology is employed to sequentially deliver precise volumes of each LBL component for the accelerated production and simple direct-write patterning of gold nanocomposites. Expanded to carbon nanotube composites, the integration of inkjet LBL with paper-based electronics and traditional microfabrication techniques is explored. Next, reversible shape transformations are achieved in carbon nanotube composites driven by the stimuli-responsive behavior of polyelectrolyte multilayers. The responsive material is printed on the nanocomposite to form a hinge structure that can deflect~37° out of plane with temperature or humidity variations. Determined by the thickness and placement of the responsive material, various environmentally stimulated actuations are achieved. Finally, clay nanocomposites are assembled onto templates for the realization of permanent three-dimensional (3D) structures. First the high-strength, optically transparent material provides advanced functionality to microcontainers with potential applications in high-throughput analysis, controlled release, and smart packaging. Second, a novel deposition machine and a 3D template are used to create a macroscale and hierarchically tunable porous material that is discussed as a potential tissue-engineering scaffold. The fairly independent structural control of each technique provides the opportunity for future development of structure-property relationships and integration of LBL nanocomposites into next generation devices.