Gel-Based Cleaning Techniques for Cultural Heritage Conservation

Gel-based cleaning techniques have emerged as a transformative approach in the conservation of cultural heritage, providing conservators with finely controllable, minimally invasive tools for the removal of unwanted surface accretions, aged varnishes, industrial soiling and overpaints. By confining aqueous or organic cleaning fluids within three-dimensional polymer networks—known as hydrogels and organogels—practitioners achieve enhanced directional control over solvent delivery, limit the penetration of cleaning agents into the substrate and reduce the risk of mechanical damage or solvent migration. The modular nature of gel formulations allows for the tuning of network architecture, mesh size, mechanical strength and viscoelastic properties to suit specific materials, whether porous stone, canvas paintings or delicate metallic surfaces. Recent developments have focused on bio-based polymer backbones, sustainable crosslinking chemistries and the incorporation of nanostructured fluids to increase selective solubilisation of resins, waxes and aged coatings. Transparency and mechanical resilience enable real-time monitoring and repeated applications without significant gel degradation. The global uptake of gel-based methodologies reflects their adaptability across diverse conservation contexts and substrates, marking a significant shift towards practice-based, scientifically grounded interventions that prioritise both efficacy and heritage integrity.

Research from Nature Portfolio

No recent Nature Portfolio content available.

Gel-Based Cleaning Techniques for Cultural Heritage Conservation publication trend

The graph below shows the total number of articles in gel-based cleaning techniques for cultural heritage conservation across all publications each year (not limited to Nature Index journals).

Technical terms

Hydrogel: A three-dimensional, water-swollen polymer network used to deliver aqueous cleaning agents while limiting fluid migration into substrates.

Organogel: A polymer gel that entraps organic solvents within its network, enabling controlled cleaning of water-sensitive or non-aqueous soiling layers.

Nanostructured fluid (NSF): A colloidal formulation containing nanoscale domains of solvents or surfactants designed for targeted solubilisation within gel matrices.

Rheology: The study of the flow and deformation behaviour of gel materials, informing optimised application, adhesion and removal strategies.

Viscoelasticity: A material property combining fluid-like and elastic responses, allowing gels to conform to complex surfaces and apply mechanical action gently.

References

1. Nanostructured bio-based castor oil organogels for the cleaning of artworks. Journal of Colloid and Interface Science (2023).
2. Nanocomposite Organogel for Art ConservationA Novel Wax Resin Removal System. ACS Applied Materials & Interfaces (2023).
3. Advanced methodologies for the cleaning of works of art. Science China Technological Sciences (2023).