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Coffee stain-driven self-assembly of mesoporous rings

Malfatti, Luca and Tokudome, Yasuaki and Okada, Kenji and Yagi, Shinsuke and Takahashi, Masahide and Innocenzi, Plinio (2012) Coffee stain-driven self-assembly of mesoporous rings. Microporous and mesoporous materials, Vol. 163 , p. 356-362. eISSN 1873-3093. Article.

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DOI: 10.1016/j.micromeso.2012.07.038

Abstract

Coffee stain-driven self-assembly is a general non equilibrium phenomenon which leaves ring-like structures upon evaporation of a colloidal droplet; we have used mesoporous monodispersed beads to form rings with a particular close packed monolayer structure. The mesoporous beads have been characterized by transmission electron microscopy which has revealed a porous radial structure with pores of around 3 nm in diameter. During evaporation the mesoporous beads are driven to organize in circular rings which show a 2D long-range ordered structure in the outer part. Arrays of mesoporous rings have been easily produced by casting small colloidal droplets on silicon and soda-lime glass substrates, after solvent evaporation, the rings are stable towards washing with variety of solvents. Absorption of fluorescent molecules into the mesoporous rings has been preliminary studied for lithography-free fabrication of micro sensing arrays. The rings have been used as functional “pits” for droplets containing fluorescent analyte. After removal of the droplets, the rings showed a strong fluorescence resulting from the analyte absorption.

Item Type:Article
ID Code:8775
Status:Published
Refereed:Yes
Uncontrolled Keywords:Coffee stain, mesoporous materials, self-assembly
Subjects:Area 09 - Ingegneria industriale e dell'informazione > ING-IND/22 Scienza e tecnologia dei materiali
Divisions:001 Università di Sassari > 01-a Nuovi Dipartimenti dal 2012 > Architettura, Design e Urbanistica
001 Università di Sassari > 01 Dipartimenti > Architettura e pianificazione > LMNT-Laboratorio di Scienza dei Materiali e NanoTecnologie
Publisher:Elsevier
eISSN:1873-3093
Deposited On:08 Mar 2013 10:15

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