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Title:Comb Polymer Architecture and Particle Size Effects on the Behavior of Biphasic Nanoparticle Inks for Direct -Write Assembly
Author(s):Yoshikawa, Jun
Doctoral Committee Chair(s):Lewis, Jennifer A.
Department / Program:Materials Science and Engineering
Discipline:Materials Science and Engineering
Degree Granting Institution:University of Illinois at Urbana-Champaign
Subject(s):Engineering, Materials Science
Abstract:Finally, the printing behavior of biphasic nanoparticle inks is investigated as a function of attractive-to-repulsive volume fraction and particle size ratio. Ink flow behavior is characterized by extrusion measurements, which reveals that the suspension viscosity, and, hence, pressure drop within micronozzles decrease as either the fraction or size of repulsive particles increases. We find that the shape retention of spanning filaments is improved by having a larger fraction of repulsive particles of smaller mean size, since this enhances the initial modulus recovery immediately after shear deformation. Biphasic inks composed of both identical and different mean particle sizes exhibit excellent flowability through fine nozzles compared to purely attractive inks, enabling fine-scale printing. These observations provide guidelines for optimizing the composition of biphasic inks for direct-write assembly of fine-scale, 3D structures.
Issue Date:2009
Description:120 p.
Thesis (Ph.D.)--University of Illinois at Urbana-Champaign, 2009.
Other Identifier(s):(MiAaPQ)AAI3395556
Date Available in IDEALS:2015-09-25
Date Deposited:2009

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