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[Nanomaterials] Percolation Diffusion into Self-Assembled Mesoporous Silica Microfibres


Percolation diffusion into long (11.5 cm) self-assembled, ordered mesoporous microfibres is studied using optical transmission and laser ablation inductive coupled mass spectrometry (LA-ICP-MS). Optical transmission based diffusion studies reveal rapid penetration (<5 s, D > 80 μm2∙s−1) of Rhodamine B with very little percolation of larger molecules such as zinc tetraphenylporphyrin (ZnTPP) observed under similar loading conditions. The failure of ZnTPP to enter the microfibre was confirmed, in higher resolution, using LA-ICP-MS. In the latter case, LA-ICP-MS was used to determine the diffusion of zinc acetate dihydrate, D~3 × 10−4 nm2∙s−1. The large differences between the molecules are accounted for by proposing ordered solvent and structure assisted accelerated diffusion of the Rhodamine B based on its hydrophilicity relative to the zinc compounds. The broader implications and applications for filtration, molecular sieves and a range of devices and uses are described. View Full-Text

John Canning 1,4,* , George Huyang 1, Miles Ma 1, Alison Beavis 2, David Bishop 2, Kevin Cook 1, Andrew McDonagh 2, Dongqi Shi 3, Gang-Ding Peng 3 and Maxwell J. Crossley 4 1 Interdisciplinary Photonics Laboratories, School of Chemistry, The University of Sydney, Sydney NSW 2006, Australia 2 School of Chemistry and Forensic Science/Institute for Nanoscale Technology, University of Technology Sydney, Sydney NSW 2007, Australia 3 Photonics and Optical Communications, School of Electrical Engineering and Telecommunications, The University of New South Wales, Sydney NSW 2052, Australia 4 School of Chemistry, The University of Sydney, Sydney NSW 2006, Australia * Author to whom correspondence should be addressed. Received: 21 January 2014 / Revised: 28 February 2014 / Accepted: 1 March 2014 / Published: 10 March 2014 (This article belongs to the Special Issue Ordered Mesoporous Nanomaterials)

Link: http://www.mdpi.com/2079-4991/4/1/157

#03312017 #MaterialScience #silica #microfiber

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