Gellan Gum Microgels as Effective Agents for a Rapid
Cleaning of Paper
Posted on 2020-06-15 - 15:08
Microgel
particles have emerged in the past few years as a favorite
model system for fundamental science and for innovative applications
ranging from the industrial to biomedical fields. Despite their potentialities,
no works so far have focused on the application of microgels for cultural
heritage preservation. Here we show their first use for this purpose,
focusing on wet paper cleaning. Exploiting their retentive properties,
microgels are able to clean paper, ensuring more controlled water
release from the gel matrix, in analogy to their macroscopic counterpart,
i.e., hydrogels. However, differently from these, the reduced size
of microgels makes them suitable to efficiently penetrate in the porous
structure of the paper and to easily adapt to the irregular surfaces
of the artifacts. To test their cleaning abilities, we prepare microgels
made of Gellan gum, a natural and widespread material already used
as a hydrogel for paper cleaning, and apply them to modern and ancient
paper samples. Combining several diagnostic methods, we show that
microgels performances in the removal of cellulose degradation byproducts
for ancient samples are superior to commonly employed hydrogels and
water bath treatments. This is due to the composition and morphology
of ancient paper, which facilitates microgels penetration. For modern
paper cleaning, performances are at least comparable to the other
methods. In all cases, the application of microgels takes place on
a time scale of a few minutes, opening the way for widespread use
as a rapid and efficient cleaning protocol.
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Di Napoli, Benedetta; Franco, Silvia; Severini, Leonardo; Tumiati, Manuel; Buratti, Elena; Titubante, Mattia; et al. (2020). Gellan Gum Microgels as Effective Agents for a Rapid
Cleaning of Paper. ACS Publications. Collection. https://doi.org/10.1021/acsapm.0c00342