Elucidating Ultrafast Molecular Permeation through Well-Defined 2D Nanochannels of Lamellar Membranes.,Angewandte Chemie International Edition

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Elucidating Ultrafast Molecular Permeation through Well-Defined 2D Nanochannels of Lamellar Membranes.
Angewandte Chemie International Edition ( IF 16.1 ) Pub Date : 2019-11-06 , DOI: 10.1002/anie.201912570
Xiaoli Wu ₁ , Xulin Cui ₁ , Wenjia Wu ₁ , Jingtao Wang _{1,

2} , Yifan Li ₁ , Zhongyi Jiang ₃

Affiliation

Lamellar membranes with well-defined 2D nanochannels show fast, selective permeation, but the underlying molecular transport mechanism is unexplored. Now, regular robust MXene Ti3 C2 Tx lamellar membranes are prepared, and the size and wettability of nanochannels are manipulated by chemically grafted hydrophilic (-NH2 ) or hydrophobic (-C6 H5 , -C12 H25 ) groups. These nanochannels have a sharp difference in mass transfer behavior. Hydrophilic nanochannels, in which polar molecules form orderly aligned aggregates along channel walls, impart ultrahigh permeance (>3000 L m-2 h-1 bar-1 ), which is more than three times higher than that in hydrophobic nanochannels with disordered molecular configuration. In contrast, nonpolar molecules with disordered configuration in both hydrophilic and hydrophobic nanochannels have comparable permeance. Two phenomenological transport models correlate the permeance with the mass transport mechanism of molecules that display ordered and disordered configuration.

中文翻译：

通过层状膜的定义明确的2D纳米通道阐明超快分子渗透。

具有明确的2D纳米通道的层状膜显示快速，选择性的渗透，但尚未探索潜在的分子转运机制。现在，制备常规的坚固的MXene Ti3 C2 Tx层状膜，并通过化学接枝的亲水（-NH2）或疏水（-C6 H5，-C12 H25）基团来控制纳米通道的大小和可湿性。这些纳米通道在传质行为上有很大的不同。亲水性纳米通道（极性分子沿着通道壁形成有序排列的聚集体）赋予超高磁导率（> 3000 L m-2 h-1 bar-1），比具有无序分子构型的疏水性纳米通道的渗透率高三倍以上。相反，在亲水性和疏水性纳米通道中具有无序构型的非极性分子具有相当的渗透性。

更新日期：2019-11-06

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