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Related Concept Videos

Theory of Strong Electrolytes01:23

Theory of Strong Electrolytes

The interionic forces of the strong electrolytes depend on the solvent's dielectric constant, which is the ability of a solvent to store electrical energy, based on its polarizability. and the solution's concentration. In high-dielectric solvents and in dilute solutions, weak electrostatic forces keep ions apart. However, in low-dielectric solvents or concentrated solutions, stronger interionic forces may cause ions to pair up as ionic doublets despite being fully ionized. The theory of strong...
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In the region where two bulk phases meet, an intricate electric charge distribution arises due to charge transfer, ion adsorption, molecular orientation, and charge distortion. This complex distribution is commonly referred to as the electrical double layer.When a solid electrode interfaces with ions in an electrolyte solution, the speed of electron transfer dictates the rates of oxidation and reduction. The electrode acquires a charge through the escape of atoms into the solution as cations or...

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Ultra-Robust Conductive Hydrogels Enabled by a Gradient Bond-Breaking Pseudo-Drying Strategy.

Dongchao Ji1, Hongyang Han2, Jiajun Li1

  • 1National Key Laboratory of Science and Technology on Advanced Composites in Special Environments, Harbin Institute of Technology, Harbin, 150001, P. R. China.

Advanced Science (Weinheim, Baden-Wurttemberg, Germany)
|September 29, 2025
PubMed
Summary
This summary is machine-generated.

Researchers developed a novel hydrogel mimicking biological tissues using a gradient bond-breaking strategy. This biomimetic approach enhances mechanical properties, creating robust materials for flexible electronics and biosensors.

Keywords:
anisotropic hydrogelaramid nanofiberscross‐scale networksgradient bond‐breakingpolyvinyl alcoholpseudo‐drying

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Area of Science:

  • Materials Science
  • Biomaterials Engineering
  • Polymer Chemistry

Background:

  • Hydrogels are hydrophilic polymer networks with significant biomedical potential.
  • Conventional hydrogels face limitations in achieving high strength, modulus, toughness, and fracture resistance.
  • Dehydration and low-temperature crystallization further restrict hydrogel applications.

Purpose of the Study:

  • To address the limitations of conventional hydrogels by developing a biomimetic gradient bond-breaking strategy.
  • To create hydrogels with enhanced mechanical properties, including high strength, modulus, and toughness.
  • To explore the potential of these advanced hydrogels in flexible electronics and biosensors.

Main Methods:

  • Constructed hydrogels with covalently crosslinked hierarchical reinforcing phases: crystalline domains and aramid nanofibers (ANFs) networks.
  • Incorporated a biomimetic gradient bond-breaking mechanism within the aqueous-poor phase.
  • Fabricated hydrogels with tunable mechanical properties via controlled fabrication parameters.

Main Results:

  • Achieved a modulus of 12.4 MPa, toughness of 73.66 MJ m-3, and fracture toughness of 268.8 kJ m-2 at 70% water content.
  • Demonstrated fracture-resistant properties comparable to dry-state materials.
  • Exhibited broad-temperature stability, high conductivity, and cytocompatibility.

Conclusions:

  • The biomimetic gradient bond-breaking strategy successfully enhances hydrogel mechanical properties.
  • The developed hydrogels surpass existing PVA-based hydrogels and natural structural materials in performance.
  • A low-temperature-operable strain sensor was successfully developed, showcasing the material's practical applications in flexible electronics.