Percolation Diffusion into Self-Assembled Mesoporous Silica Microfibres

Nanomaterials

John Canning³  George Huyang³  Miles Ma³  Alison Beavis²  David Bishop²  Kevin Cook³  Andrew McDonagh²  Dongqi Shi¹  Gang-Ding Peng¹ 

[1] Photonics and Optical Communications, School of Electrical Engineering and Telecommunications, The University of New South Wales, Sydney NSW 2052, Australia; E-Mails:;School of Chemistry and Forensic Science/Institute for Nanoscale Technology, University of Technology Sydney, Sydney NSW 2007, Australia; E-Mails:;Interdisciplinary Photonics Laboratories, School of Chemistry, The University of Sydney, Sydney NSW 2006, Australia; E-Mails:

关键词: self-assembly;    super diffusion;    nanoparticles;    microfibres;    microwires;    mesoporous;    nanopores;    sensors;    filters;    nano-composites;    microfluidics;    molecular sieves;    laser ablation inductive coupled mass spectroscopy;    colloids;   

DOI  :  10.3390/nano4010157

来源: mdpi

【 摘 要 】

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.

【 授权许可】

CC BY   
© 2014 by the authors; licensee MDPI, Basel, Switzerland.