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Novel Alginate-Based Physical Hydrogels: Promising Cleaning Tools for Sensitive Artifacts.

Matteo Ferretti1, Maduka L Weththimuni1, Donatella Sacchi1

  • 1Department of Chemistry, Università di Pavia, 27100 Pavia, Italy.

Polymers
|November 27, 2025
PubMed
Summary

Novel alginate hydrogels were developed using six amines for cleaning sensitive materials. These new gels effectively removed soil from wood and paper surfaces, demonstrating improved properties for heritage conservation.

Keywords:
FT-IRSEM-EDXalginateartifact cleaninghydrogelsiron gall inkphysical crosslinkingpolysaccharidesshape controlwood materials

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Area of Science:

  • Materials Science
  • Polymer Chemistry
  • Conservation Science

Background:

  • Natural polysaccharides, like alginate, are versatile biopolymers utilized in hydrogel preparation.
  • Hydrogel materials derived from carbohydrate polymers are employed for surface cleaning applications, particularly in cultural heritage preservation.
  • Sensitive materials such as wood and paper require specialized cleaning methods to prevent damage.

Purpose of the Study:

  • To prepare novel physical hydrogels based on alginate for the gentle cleaning of sensitive materials.
  • To investigate the effect of ionic crosslinking with six different amines on alginate hydrogel properties.
  • To evaluate the cleaning efficacy of these novel hydrogels on soil removal from wood and paper surfaces.

Main Methods:

  • Alginate biopolymer was used as the base material.
  • Ionic crosslinking was performed using six different amines in the presence of N-hydroxysuccinimide as a co-gelling agent.
  • The synthesized hydrogels were characterized using Fourier-transform infrared spectroscopy (FT-IR), thermal analysis, scanning electron microscopy with energy-dispersive X-ray spectroscopy (SEM-EDS), mechanical testing, and moisture property evaluation.

Main Results:

  • The introduction of the investigated amines significantly improved the inherent properties of alginate.
  • The synthesized alginate-amine hydrogels exhibited enhanced mechanical properties and suitable moisture characteristics.
  • The developed hydrogels demonstrated effective soil removal capabilities when applied to sensitive surfaces like wood and paper.

Conclusions:

  • Novel alginate-based physical hydrogels can be successfully prepared through ionic crosslinking with specific amines.
  • These hydrogels possess improved material properties compared to unmodified alginate.
  • The developed hydrogels show significant potential as effective and safe cleaning agents for the conservation of cultural heritage materials.