Percolation Diffusion into Self-Assembled MesoporousSilica Microfibres

Nanomaterials

John Canning¹  Kevin Cook¹  George Huyang¹  Miles Ma¹  Dongqi Shi²  Gang-Ding Peng²  Andrew McDonagh³  David Bishop³  Alison Beavis³  Maxwell J. Crossley⁴ 

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

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: DOAJ

【 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】

Unknown