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Paper without a Trail: Time-Dependent Encryption using Pillar[5]arene-Based Host-Guest Invisible Ink.

Huaqiang Ju1, Chao Nan Zhu2, Hu Wang1

  • 1State Key Laboratory of Chemical Engineering, Key Laboratory of Excited-State Materials of Zhejiang Province, Stoddart Institute of Molecular Science, Department of Chemistry, Zhejiang University, Hangzhou, 310027, China.

Advanced Materials (Deerfield Beach, Fla.)
|November 21, 2021
PubMed
Summary

Researchers developed a novel invisible ink using pillar[5]arene supramolecular networks. This stimuli-responsive material enables time-dependent information encryption with adjustable fading rates for enhanced data security.

Keywords:
host-guest systemsinformation securityinvisible inkpillararenessupramolecular chemistry

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Area of Science:

  • Materials Science
  • Supramolecular Chemistry
  • Information Security

Background:

  • Photochromic materials offer dynamic optical properties.
  • Spiropyran moieties exhibit reversible color changes upon light or heat stimuli.
  • Supramolecular networks provide a tunable platform for material design.

Purpose of the Study:

  • To report a stimuli-responsive invisible ink for time-dependent information encryption.
  • To investigate the influence of supramolecular network structure on photochromic behavior.
  • To demonstrate a novel approach for enhancing offline data security.

Main Methods:

  • Grafting spiropyran moieties onto a pillar[5]arene-based supramolecular network.
  • Utilizing ultraviolet (UV) and visible light, along with heat, to induce and reverse photochromic isomerization.
  • Modulating host-guest crosslinking density using pillar[5]arene hosts and nitrile guests.
  • Employing UV patterning for selective information encoding.

Main Results:

  • The developed material exhibits time-dependent photochromic behavior with controllable fading rates.
  • Increased host-guest crosslinking density leads to slower discoloration kinetics due to merocyanine aggregation.
  • Fading rates can be precisely tuned by adjusting the concentration of competing host or guest molecules.
  • Successful demonstration of time-dependent information encryption using UV patterning and selective competitor placement.

Conclusions:

  • Pillar[5]arene-based supramolecular networks functionalized with spiropyran are effective for stimuli-responsive invisible inks.
  • The time-dependent photochromic properties can be tailored by controlling supramolecular crosslinking.
  • This technology offers a unique and secure method for offline portable data encryption.