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Nanobelts of hexagonal columnar crystal lattice through ionic self-assembly

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Abstract

Well-organized nanobelts from the complexes of p-aminoazobenzene hydrochloride (AzoHCl) and sodium bis(2-ethylhexyl) sulfosuccinate (AOT) have been constructed through the non-covalent forces such as electrostatic, hydrophobic, and π-π interactions. The nanobelt morphologies were characterized by optical microscope (OM) and scanning electronic microscope (SEM). The nanobelts with the length up to hundreds of micrometers were stacked layer by layer. Their crystal structures were analyzed by small-angle X-ray scattering (SAXS) and X-ray power diffraction (XRD) measurements. The obtained results indicated that the nanobelts of a hexagonal lattice were self-assembled from the columns of complex aggregates with azobenzene groups in the core and hydrocarbon tails of AOT outside. The H-type aggregation state of azobenzene groups here lead to a fluorescence quenching of AzoHCl. The differential scanning calorimetry (DSC) and polarizing optical microscopy (POM) measurements demonstrated the thermostability and crystal nature for these nanobelts. Such a versatile route of self-assembly should shed light on ordered functional materials preparation, with the use of economical surfactants and organic functional molecules.

SEM image of nanobelts (left) with the characteristic fan-like texture of hexagonal column phase (right)

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Acknowledgments

This work was supported by the National Natural Science Foundation of China (20973104 and 21373127) and the Specialized Research Fund for the Doctoral Program of Higher Education (20130131110010).

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Authors and Affiliations

  1. Key Laboratory of Colloid and Interface Chemistry, Shandong University, Ministry of Education, Jinan, 250100, People’s Republic of China

    Guanchen Xu, Qintang Li & Xiao Chen

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  1. Guanchen Xu
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  2. Qintang Li
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  3. Xiao Chen
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Correspondence to Xiao Chen.

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Xu, G., Li, Q. & Chen, X. Nanobelts of hexagonal columnar crystal lattice through ionic self-assembly. Colloid Polym Sci 293, 2877–2882 (2015). https://doi.org/10.1007/s00396-015-3682-9

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  • DOI: https://doi.org/10.1007/s00396-015-3682-9

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