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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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Polymer Classification: Crystallinity01:21

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Unlike ionic or small covalent molecules, polymers do not form crystalline solids due to the diffusion limitations of their long-chain structures. However, polymers contain microscopic crystalline domains separated by amorphous domains.
Crystalline domains are the regions where polymer chains are aligned in an orderly manner and held together in proximity by intermolecular forces. For example, chains in the crystalline domains of polyethylene and nylon are bound together by van der Waals...
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Updated: Jan 15, 2026

Pretreatment of Lignocellulosic Biomass with Low-cost Ionic Liquids
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Cellulose-mediated ionic liquid crystallization enables tough-stiff switchable ionogels.

Siheng Wang1,2, Huayu Liu1, Zhengyang Yu1

  • 1Sustainable Functional Biomaterials Laboratory, Bioproducts Institute, Department of Wood Science, University of British Columbia, Vancouver, BC, Canada.

Nature Communications
|October 9, 2025
PubMed
Summary
This summary is machine-generated.

Researchers developed a novel tough-stiff switchable ionogel using reversible solvent crystallization. This material exhibits tunable mechanical properties and rapid, repeatable shape recovery upon heating, offering a new strategy for intelligent materials.

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Area of Science:

  • Materials Science
  • Polymer Chemistry
  • Nanotechnology

Background:

  • Developing mechanically switchable materials inspired by nature is challenging.
  • Achieving reversible phase transitions in ionogels with ambient temperature-triggered crystallization using ionic liquids is difficult.

Purpose of the Study:

  • To develop a tough-stiff switchable ionogel with reversible phase transitions.
  • To explore the use of cellulose as a chemical regulator for ionic liquid crystal formation.
  • To demonstrate a strategy for creating intelligent, reconfigurable materials.

Main Methods:

  • Designed a switchable ionogel utilizing a reversible solvent crystallization approach.
  • Employed cellulose as a chemical regulator to promote ionic liquid crystal formation.
  • Investigated the mechanical properties (toughness, stiffness) and phase transition behavior.

Main Results:

  • Achieved a tough ionogel with bulk toughness of 25.7 MJ m⁻³ and fracture toughness of 47.1 kJ m⁻².
  • Demonstrated switching to a stiff ionogel with tensile modulus of 134.6 MPa and compressive modulus of 48.9 MPa.
  • Observed rapid, reversible, and repeatable shape recovery upon heating due to melting of ionic liquid crystals.

Conclusions:

  • The developed ionogel exhibits tunable mechanical properties and phase transitions triggered by temperature.
  • Solvent crystallization in ionogels provides a viable strategy for creating intelligent, reconfigurable materials.
  • This work offers a new pathway for designing advanced materials with customizable functions.