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Shaping mesoporous films using dewetting on x-ray pre-patterned hydrophilic/hydrophobic layers and pinning effects at the pattern edge

Costacurta, Stefano and Falcaro, Paolo and Malfatti, Luca and Marongiu, Daniela and Marmiroli, Benedetta and Cacho-Nerin, Fernando and Amenitsch, Heinz and Kirkby, Nigel and Innocenzi, Plinio (2011) Shaping mesoporous films using dewetting on x-ray pre-patterned hydrophilic/hydrophobic layers and pinning effects at the pattern edge. Langmuir, Vol. 27 (7), p. 3898-3905. eISSN 1520-5827. Article.

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DOI: 10.1021/la103863d

Abstract

Ordered mesoporous silica micrometer-sized structures have been fabricated via selective dewetting of the coating sol on a hydrophilic/hydrophobic fluorinated silica substrate, which had been pre-patterned using deep X-ray lithography with a synchrotron radiation source. We have observed that deposition of mesoporous films on the pre-patterned areas can be used as a design tool for obtaining regions of specific geometry and dimensions. The evaporation of the solution in constrained conditions because of pinning at the pattern edges gives layers with thicker edges. This edge effect appears dependent upon the dimension of the pre-patterned hydrophilic/hydrophobic layer; in smaller patterns, the evaporation is too fast and thickening of the edges is not observed. We have used infrared imaging, optical profilometry, and atomic force microscopy to characterize the patterned layers and the edge effect, produced by pinning at the border of the microstructures.

Item Type:Article
ID Code:5764
Status:Published
Refereed:Yes
Uncontrolled Keywords:Mesoporous structure, lithographic techniques, hydrophilic/hydrophobic layers, x-ray
Subjects:Area 09 - Ingegneria industriale e dell'informazione > ING-IND/22 Scienza e tecnologia dei materiali
Divisions:001 Università di Sassari > 01 Dipartimenti > Architettura e pianificazione > LMNT-Laboratorio di Scienza dei Materiali e NanoTecnologie
Publisher:American Chemical Society
eISSN:1520-5827
Deposited On:10 May 2011 16:41

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