渗滤扩散进入自组装介孔二氧化硅微纤维

Percolation Diffusion into Self-Assembled Mesoporous Silica Microfibres.

作者信息

Canning John, Huyang George, Ma Miles, Beavis Alison, Bishop David, Cook Kevin, McDonagh Andrew, Shi Dongqi, Peng Gang-Ding, Crossley Maxwell J

机构信息

Interdisciplinary Photonics Laboratories, School of Chemistry, The University of Sydney, Sydney NSW 2006, Australia.

School of Chemistry, The University of Sydney, Sydney NSW 2006, Australia.

出版信息

Nanomaterials (Basel). 2014 Mar 10;4(1):157-174. doi: 10.3390/nano4010157.

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, > 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, ~3 × 10 nm²∙s. 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.

利用光透射和激光烧蚀电感耦合质谱法（LA-ICP-MS）研究了渗流扩散进入长（11.5厘米）的自组装有序介孔微纤维的过程。基于光透射的扩散研究表明，若丹明B能快速渗透（<5秒，>80μm²∙s⁻¹），在类似负载条件下观察到较大分子如四苯基卟啉锌（ZnTPP）几乎没有渗流。使用LA-ICP-MS以更高分辨率证实了ZnTPP未能进入微纤维。在后一种情况下，LA-ICP-MS用于测定二水合醋酸锌的扩散，约为3×10 nm²∙s⁻¹。基于若丹明B相对于锌化合物的亲水性，提出有序溶剂和结构辅助加速扩散来解释分子间的巨大差异。描述了其在过滤、分子筛以及一系列装置和用途方面更广泛的意义和应用。