Single-walled zeolitic nanotubes
Single-walled zeolitic nanotubes
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DOI：
10.1126/science.abg3793
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发表时间：
2022-01-07
期刊：
影响因子：
56.9
通讯作者：
Nair, Sankar
中科院分区：
文献类型：
--
作者：
Korde, Akshay;Min, Byunghyun;Nair, Sankar
本文报道了具有微孔沸石壁的单壁硅酸铝纳米管的合成和结构。这种准一维沸石由一种波状结构导向剂（bolaform structure-directing agent， SDA）组装而成，SDA含有一个中心联苯基团，通过C-10烷基链连接到喹啉端基。高分辨率电子显微镜和衍射以及其他支持方法揭示了一种独特的壁面结构，它是两种沸石结构类型（beta和MFI）的特征建筑层的混合体。这种杂化结构源于弯曲纳米管壁形成过程中应变能的最小化。由于SDA分子的自组装，纳米管的形成涉及到介观结构的早期出现。SDA分子的联苯核基表现出p堆积的迹象，而外围的喹啉基则指导微孔壁结构。
We report the synthesis and structure of single-walled aluminosilicate nanotubes with microporous zeolitic walls. This quasi-one-dimensional zeolite is assembled by a bolaform structure-directing agent (SDA) containing a central biphenyl group connected by C-10 alkyl chains to quinuclidinium end groups. High-resolution electron microscopy and diffraction, along with other supporting methods, revealed a unique wall structure that is a hybrid of characteristic building layers from two zeolite structure types, beta and MFI. This hybrid structure arises from minimization of strain energy during the formation of a curved nanotube wall. Nanotube formation involves the early appearance of a mesostructure due to self-assembly of the SDA molecules. The biphenyl core groups of the SDA molecules show evidence of p stacking, whereas the peripheral quinuclidinium groups direct the microporous wall structure.