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Related Concept Videos

Ion Exchange01:17

Ion Exchange

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Ion exchange chromatography separates charged molecules from a solution by reversibly exchanging them with mobile, or 'active', ions associated with the oppositely charged stationary phase. This method can be used to separate ions, soften and deionize water, and purify solutions. The polymers comprising the ion-exchange column are high-molecular-weight and chemically stable polymers, crosslinked to be porous and essentially insoluble. They are also functionalized with either acidic or...
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Lignosulfonate/diblock copolymer polyion complexes with aggregation-enhanced and pH-switchable fluorescence for

Nan Shi1, Yuanyuan Ding1, Dong Wang1

  • 1State Key Laboratory of Heavy Oil Processing, College of Chemical Engineering, China University of Petroleum, Qingdao, Shandong 266580, China.

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|August 3, 2021
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Summary

Sustainable functional materials were created using lignosulfonate and a PEO-b-PDMAEMA copolymer. These polyion complexes exhibit tunable fluorescence for applications in information writing, encryption, and anticounterfeiting.

Keywords:
Aggregation-induced emissionLignosulfonateSupramolecular polyion complex

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Area of Science:

  • Materials Science
  • Polymer Chemistry
  • Biomass Utilization

Background:

  • Natural polymers offer sustainable building blocks for functional materials.
  • Lignin, a biomass component, presents opportunities for valorization into advanced materials.
  • Developing stimuli-responsive materials from renewable resources is crucial for green chemistry.

Purpose of the Study:

  • To construct supramolecular polyion complexes (PICs) using lignosulfonate and a specific diblock copolymer.
  • To investigate the pH-dependent fluorescence behavior and assembly transformations of these PICs.
  • To explore the potential of these PICs in information writing-erasing and encryption-decryption systems.

Main Methods:

  • Synthesis of poly(ethylene oxide-b-N, N-dimethylaminoethyl methacrylate) (PEO-b-PDMAEMA) diblock copolymers.
  • Formation of supramolecular PICs through electrostatic interactions between lignosulfonate and PEO-b-PDMAEMA.
  • Characterization of PIC assembly and fluorescence properties under varying pH conditions and copolymer concentrations.
  • Demonstration of information writing-erasing and encryption-decryption functionalities.

Main Results:

  • PICs exhibited pH-dependent blue emission with quenching-enhancing tendencies at pH 5.6 and greenish-blue fluorescence promotion at pH 9.5.
  • Assembly transformation and fluorescence modulation were controlled by electrostatic interactions, hydrogen bonding, and copolymer content.
  • The diblock copolymer's topology and multiple interaction sites facilitated efficient fluorescence regulation.
  • Successful demonstration of information writing-erasing and encryption-decryption systems based on emission intensity and pH-responsive color changes.

Conclusions:

  • Lignosulfonate and PEO-b-PDMAEMA form functional PICs with tunable fluorescence.
  • These PICs offer a novel approach for enhancing lignin-based materials' fluorescence properties.
  • The developed systems show promise for applications in sensing, imaging, monitoring, and anticounterfeiting technologies.