Journal
JOURNAL OF COLLOID AND INTERFACE SCIENCE
Volume 529, Issue -, Pages 234-242Publisher
ACADEMIC PRESS INC ELSEVIER SCIENCE
DOI: 10.1016/j.jcis.2018.06.008
Keywords
Dual-droplet inkjet printing; pH-modulation; Interfacial self-assembly; Deposition of colloidal nanoparticles
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Funding
- National Science Foundation [CMMI-1634938]
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Hypothesis: Interfacial self-assembly has been demonstrated as a powerful driving mechanism for creating various nanostructured assemblies. In this work, we employed a dual-droplet printing process and interfacial self-assembly mechanism to produce deposits with controlled assembly structures of colloidal nanoparticles. We hypothesize that pH modulation of the droplet will influence the interfacial self assembly through the multibody interactions, e.g. particle-particle, particle-interface, and particle substrate interactions, correspondingly affecting the deposition morphology of the colloidal nanoparticles. Experiments: During the dual-droplet printing, a wetting droplet, containing colloidal nanoparticles, was jetted over a supporting droplet that contains water only. pH modulation was carried out to the supporting droplet. The self-assembly of two kinds of functionalized polystyrene (PS) nanoparticles (carboxyl-PS and sulfate-PS) was systematically investigated under various pH conditions. Findings: Depending on the pH level of the supporting droplet, deposits of carboxyl-PS particles ranging from clear ring-like patterns to nearly uniform monolayer depositions have been obtained. On the other hand, the sulfate-PS particles, even at extreme basic and acidic environments, successfully assemble into nearly monolayer depositions. The multibody interactions are discussed. Such findings can be harnessed in manufacturing high-performance optical and electronic devices. (C) 2018 Elsevier Inc. All rights reserved.
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