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Assembling Shape-Persistent High-Order Sierpiński Triangular Fractals.

Zhilong Jiang1, Die Liu1, Mingzhao Chen1

  • 1Institute of Environmental Research at Greater Bay Area; Key Laboratory for Water Quality and Conservation of the Pearl River Delta, Ministry of Education; Guangzhou Key Laboratory for Clean Energy and Materials, Guangzhou University, Guangzhou-510006, China.

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|May 8, 2020
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Summary
This summary is machine-generated.

Researchers created giant, second and third-generation Sierpiński triangles using a novel retro-assembly pathway. These fractal supramolecules can form hydrogels, offering potential for controlled release applications.

Keywords:
Materials Characterization TechniquesMolecular Self-AssemblySupramolecular MaterialsSupramolecular Technologies

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Area of Science:

  • Supramolecular Chemistry
  • Materials Science
  • Nanotechnology

Background:

  • Fractals possess significant aesthetic, mathematical, and philosophical value.
  • While Sierpiński triangles are well-known, creating discrete, shape-persistent fractal supramolecules, especially higher generations, remains challenging.
  • Recent advancements have enabled the synthesis of low-generation fractal supramolecules.

Purpose of the Study:

  • To develop a retro-assembly pathway for synthesizing higher-generation fractal supramolecules.
  • To create nanometer-scale, second and third-generation Sierpiński triangles (Pascal's triangle).
  • To investigate the potential of these fractal assemblies in forming supramolecular hydrogels.

Main Methods:

  • Utilized a retro-assembly pathway for fractal supramolecule synthesis.
  • Characterized the resulting structures using Nuclear Magnetic Resonance (NMR), Diffusion Ordered Spectroscopy (DOSY), Electrospray Ionization Mass Spectrometry (ESI-MS), Traveling Wave Ion Mobility Mass Spectrometry (TWIM-MS), Transmission Electron Microscopy (TEM), and Atomic Force Microscopy (AFM).
  • Investigated hydrogel formation from the counterions of the fractal architectures in water.

Main Results:

  • Successfully synthesized discrete, nanometer-scale, second and third-generation Sierpiński triangles.
  • Confirmed the precise structure and formation of these gigantic triangular assemblies through comprehensive analytical techniques.
  • Demonstrated that the dense-packed counterions of these fractal architectures can self-assemble into supramolecular hydrogels in aqueous solutions.

Conclusions:

  • The study presents a fundamental chemical pathway to overcome synthetic limitations in creating complex molecular fractals and giant supramolecular constructs.
  • The research introduces a novel type of supramolecular hydrogel derived from fractal architectures.
  • These supramolecular hydrogels show promise for applications in controlled release technologies.