共查询到20条相似文献,搜索用时 15 毫秒
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《Angewandte Chemie (Weinheim an der Bergstrasse, Germany)》2017,129(38):11538-11542
A complex two‐dimensional (2D) hierarchical heterostructure was fabricated by a sequential two‐dimensional seeded self‐assembly, which consisted of laterally grown nanotubes from one perylene monomer and terminally elongated nanocoils from a similar perylene monomer on microribbon seeds from a third perylene. Because the nanotube and nanocoil monomers can form kinetically trapped off‐pathway aggregates to prevent self‐nucleation and have similar molecular organizations to different facets of the seeds, the nanotube and nanocoil monomers preferentially nucleate and grow on the seed sides and terminal ends, respectively, to form a complex 2D hierarchical heterostructure. The strategy used in this work can be extended to fabricate other complex nanoarchitectures from small molecules. 相似文献
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Michael J. Strauss Darya Asheghali Austin M. Evans Rebecca L. Li Anton D. Chavez Chao Sun Matthew L. Becker William R. Dichtel 《Angewandte Chemie (Weinheim an der Bergstrasse, Germany)》2019,131(41):14850-14856
Nanotubes assembled from macrocyclic precursors offer a unique combination of low dimensionality, structural rigidity, and distinct interior and exterior microenvironments. Usually the weak stacking energies of macrocycles limit the length and mechanical strength of the resultant nanotubes. Imine‐linked macrocycles were recently found to assemble into high‐aspect ratio (>103), lyotropic nanotubes in the presence of excess acid. Yet these harsh conditions are incompatible with many functional groups and processing methods, and lower acid loadings instead catalyze macrocycle degradation. Here we report pyridine‐2,6‐diimine‐linked macrocycles that assemble into high‐aspect ratio nanotubes in the presence of less than 1 equiv of CF3CO2H per macrocycle. Analysis by gel permeation chromatography and fluorescence spectroscopy revealed a cooperative self‐assembly mechanism. The low acid concentrations needed to induce assembly enabled nanofibers to be obtained by touch‐spinning, which exhibit higher Young's moduli (1.33 GPa) than many synthetic polymers and biological filaments. These findings represent a breakthrough in the design of inverse chromonic liquid crystals, as assembly under such mild conditions will enable the design of structurally diverse and mechanically robust nanotubes from synthetically accessible macrocycles. 相似文献
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DNA Block Copolymer Doing It All: From Selection to Self‐Assembly of Semiconducting Carbon Nanotubes
Minseok Kwak Jia Gao Deepak K. Prusty Andrew J. Musser Vladimir A. Markov Nikolaos Tombros Marc C. A. Stuart Wesley R. Browne Egbert J. Boekema Gerrit tenBrinke Harry T. Jonkman Bart J. vanWees Maria A. Loi Andreas Herrmann 《Angewandte Chemie (Weinheim an der Bergstrasse, Germany)》2011,123(14):3264-3268
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