Bhatta Hemant, Enderlein Jörg, Rosengarten Gary
School of Mechanical Engineering, The University of New South Wales, Sydney 2052, Australia.
J Nanosci Nanotechnol. 2009 Nov;9(11):6760-6. doi: 10.1166/jnn.2009.2020.
The intricate pore architecture of diatom frustules has been extensively studied mainly as the basis of diatom classification. There have, however, been very few reports on understanding the effect of the pore architecture on the movement of molecules through the pores. Information on molecular transport though diatom membrane pores has the potential to help develop more efficient membrane filtration systems. In this paper the transport of molecules through individual diatom nanopores is investigated. Fluorescence correlation spectroscopy (FCS) is used to determine diffusion coefficients. Thus, for the very first time, we measure the effect of the three dimensional pore structure of the diatom Coscinodiscus wailesii, on the mean diffusion coefficient through the pores. The results show almost a 50% decrease in the diffusion coefficient relative to that in the free solution.
硅藻壳复杂的孔隙结构主要作为硅藻分类的基础得到了广泛研究。然而，关于孔隙结构对分子通过孔隙运动的影响的报道却非常少。有关分子通过硅藻膜孔传输的信息有可能帮助开发更高效的膜过滤系统。本文研究了分子通过单个硅藻纳米孔的传输。荧光相关光谱法（FCS）用于确定扩散系数。因此，我们首次测量了硅藻威氏圆筛藻的三维孔隙结构对通过孔隙的平均扩散系数的影响。结果表明，相对于自由溶液中的扩散系数，扩散系数几乎降低了50%。
