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Preparation of Inks with Monodisperse Colloidal Silica and their Self-Assembly in a Ink-Jet Printed Droplet

Published online by Cambridge University Press:  15 February 2011

Hwa-Young Ko ,
Hyunjung Shin  and
Jooho Moon
Hwa-Young Ko
Affiliation:
Department of Ceramic Engineering, Yonsei University, 134 Shinchon-dong Seodaemun-gu, Seoul 120-749, Korea
Hyunjung Shin
Affiliation:
School of Advanced Materials Engineering, Kookmin University, 861-1 Chunnung-dong Songbuk-gu, Seoul 136-702, Korea
Jooho Moon
Affiliation:
Department of Ceramic Engineering, Yonsei University, 134 Shinchon-dong Seodaemun-gu, Seoul 120-749, Korea
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Abstract

Semispherical self assemblies of colloids have been fabricated on a substrate using inkjet printing with an ink of submicron-sized monodisperse silica particles. Colloidal silica has been prepared by Stöber process. The shape and monodispersity of the synthesized colloidal particles were observed by scanning electron microscopy (SEM) and laser light scattering particle analyzer. Simple test patterns on various substrates (silicon wafer, Cu foil, and Mylar film) were printed with commercial HP printer. It was found that the uniformity and spatial extent of the self-assembled colloidal silica within a dot were significantly influenced by the contact angle between ink and substrates. Ink droplets printed on the hydrophobic Mylar film maintain a higher contact angle as compared to the hydrophilic substrates such as Si wafer. Slower evaporation and high capillary stress exerted on the ink droplet allow hemispherical colloidal aggregates with an ordered internal structure on Mylar film.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 776: Symposium Q – Unconventional Approaches to Nanostructures with Applications in Electronics, Photonics, Information Storage and Sensing , 2003 , Q5.17
Copyright
Copyright © Materials Research Society 2003

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