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Acknowledgement to Reviewers of Nanomaterials in 2013
Nanomaterials 2014, 4(1), 157-174; doi:10.3390/nano4010157
Article

Percolation Diffusion into Self-Assembled Mesoporous Silica Microfibres

1,4,* , 1
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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)
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Abstract

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∙s1) 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.
Keywords: self-assembly; super diffusion; nanoparticles; microfibres; microwires; mesoporous; nanopores; sensors; filters; nano-composites; microfluidics; molecular sieves; laser ablation inductive coupled mass spectroscopy; colloids self-assembly; super diffusion; nanoparticles; microfibres; microwires; mesoporous; nanopores; sensors; filters; nano-composites; microfluidics; molecular sieves; laser ablation inductive coupled mass spectroscopy; colloids
This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

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Canning, J.; Huyang, G.; Ma, M.; Beavis, A.; Bishop, D.; Cook, K.; McDonagh, A.; Shi, D.; Peng, G.-D.; Crossley, M.J. Percolation Diffusion into Self-Assembled Mesoporous Silica Microfibres. Nanomaterials 2014, 4, 157-174.

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