Water Transport in Periodic Mesoporous Organosilica Materials
Water Transport in Periodic Mesoporous Organosilica Materials
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周期性介孔有机硅材料中的水传输
DOI：
10.1021/acs.jpcc.8b00046
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发表时间：
--
影响因子：
3.7
通讯作者：
Valiullin
中科院分区：
文献类型：
--
作者：
Mietner;Fröba;Valiullin
利用脉冲场梯度核磁共振研究了水在周期性介孔有机硅中的传输。研究了一系列具有不同孔壁化学组成的等几何PMO材料，并与具有相同孔径的纯硅质MCM-41材料进行了比较。测量的长程水扩散率被发现在很大程度上是由材料的宏观纹理性质，即，由颗粒的几何形状和颗粒团聚的程度，并通过热力学条件下进行实验控制。结果表明，它们的综合作用导致水分子要么主要沿着毛细冷凝水域传播，要么经常交替这些域和水相之间的粒子间空间的轨迹。由于在这两个制度的传输速率有很大的不同，它表明，通过有目的地选择的PMO组合物，远程传输速率和化学功能，可以故意调整。
Water transport in periodic mesoporous organosilicas (PMOs) was studied using pulsed field gradient NMR. A series of isogeometric PMO materials with different chemical compositions of the pore walls were investigated and compared to a purely siliceous MCM-41 material with an identical pore size. The long-range water diffusivities measured were found to be largely controlled by the macroscopic textural properties of the materials, namely, by the particle geometry and a degree of the particle agglomeration, and by thermodynamic conditions under which the experiments were performed. It is shown that their combined effect caused water molecules either to propagate predominantly along the capillary-condensed water domains or to frequently alternate their trajectories between these domains and the water phase in the interparticle space. Because the transport rates in these two regimes differ substantially, it is suggested that by a purposeful choice of the PMO composition, both the long-range transport rate and the chemical functionality can deliberately be tuned.
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影响因子：
15
作者：
Huang, Hubiao;Sato, Hiroshi;Aida, Takuzo
通讯作者：
Aida, Takuzo
纳米多孔硅中的比例依赖性扩散各向异性。
影响因子：
4.6
作者：
Kondrashova D;Lauerer A;Mehlhorn D;Jobic H;Feldhoff A;Thommes M;Chakraborty D;Gommes C;Zecevic J;de Jongh P;Bunde A;Kärger J;Valiullin R
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Valiullin R
影响因子：
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作者：
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通讯作者：
GERHARDT, R
影响因子：
3.9
作者：
Zeigermann, P.;Naumov, S.;Valiullin, R.
通讯作者：
Valiullin, R.
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影响因子：
10.9
作者：
In;D. Do;A. Rodrigues
通讯作者：
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