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Michael Addition Inducing Self-Assembly to Construct Mechanochromic BP Film.

Xuejing Xu1, Han Gao1, Shuqi Ren1

  • 1Department of Applied Physics, Hebei University of Technology, Tianjin, 300401, China.

Small (Weinheim an Der Bergstrasse, Germany)
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Summary

Researchers developed a new method for creating soft 3D cubic nanostructured films with blue phase (BP) liquid crystals. These films exhibit mechanochromic properties, changing color with mechanical stress, and can be reversibly controlled by force and temperature.

Keywords:
Michael addition reactionblue phasefunctionalizationself‐assemblysoft photonics

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Area of Science:

  • Materials Science
  • Nanotechnology
  • Soft Matter Physics

Background:

  • Liquid crystalline blue phases (BP) exhibit 3D cubic nanostructures, offering unique optical properties for photonic crystals.
  • Challenges exist in simultaneously achieving self-assembly and mechanochromic responses in soft 3D cubic nanostructures.

Purpose of the Study:

  • To present a scalable strategy for preparing soft 3D cubic nanostructured films with mechanochromic properties.
  • To investigate the self-assembly and phase transitions of blue phases induced by chemical reactions.

Main Methods:

  • Utilizing Michael addition reaction oligomerization to induce the assembly of double-twisted cylinders.
  • Employing composite mask photopolymerization to create patterned blue phase films.
  • Investigating phase transitions from Blue Phase II (BPII) to Blue Phase I (BPI) and chiral nematic phases.

Main Results:

  • Achieved a scalable preparation of soft 3D cubic nanostructured films.
  • Demonstrated distinct mechanochromic sensitivity in BP patterns derived from different phases.
  • Reported reversible erasure and recurrence of patterns using mechanical force and temperature.
  • Obtained an average domain size of 96 µm for BPII, significantly larger than conventional methods.

Conclusions:

  • The developed strategy enables the creation of mechanochromic blue phase materials with controllable self-assembly.
  • This work offers new insights into the selective chemochromism and self-assembly of functional materials.
  • The findings pave the way for advanced functional materials and devices with tunable optical and mechanical responses.