Sullivan proposed that the darkening might be related to the gelatin content of the rag test paper.
After oven aging for 21 days, the rag sample treated with gellan gum darkened slightly, while all the other samples did not. She found that applying the gels through a Japanese paper barrier was the most effective method in minimizing residue. Sullivan found that all the gels tested left a residue, with gellan gum apparently leaving behind the most. The cross sections seemed to suggest that gellan gum was being absorbed into the paper. Besides surface examination, cross sections of the samples were also taken to see if the gels were penetrating the paper surface. In addition, a few variables were added to mimic treatment, such as applying the gels through Japanese paper and clearing the gels using a damp swab. The experiment used agarose, gellan gum and methyl cellulose gels in three different concentrations applied to three different papers for three different time periods. If so, did how does that residue impact the paper? To easily track residue on the paper samples, fluorescein dyes visible in UV light were added to the gels tested. It was one of the few studies exploring quantitatively if residue is left behind by gels used in the treatment of works on paper. The fourth talk I wanted to highlight is Michelle Sullivan’s “Rigid polysaccharide gels for paper conservation: a residue study” - of particular interest to me as a paper conservator. They ranged from coating/grime removal from a giant sequoia tree cross section, to dirt and varnish removal from Delacroix wall paintings, to removal of repairs from a fragile felt hat from a 18 th century ship wreck, and an experiment comparing residues left behind by various gels on paper. The talks were excellent, and I’ve focused on four that were notable for the wide range of materials treated and challenges faced. In mid-October, over the course of three days, some 41 authors presented research, techniques and ideas on gels in conservation.
#Uv light converse series#
This blog post is part of a series of observations about the London “Gels in Conservation” conference co-hosted by the Tate and IAP (International Academic Projects, Ltd). Thus, the multifunctional glass with superhydrophobicity, self-cleaning and UV-shielding properties is fabricated and can be used in relevant application areas.Gels in Conservation Conference, October 16-18, 2017 Meanwhile, the multifunctional glass can shield 98% UV light and still retains 34.9% visible light transmittance. The water droplet bouncing test shows the multifunctional glass was suiting Cassie state. Results indicate that the water contact angle was enhanced from hydrophilic (14°) to superhydrophobic state (163°) and the prepared glass can present excellent self-cleaning and antifouling effect. Then, the multifunctional glass was fabricated and compared with the traditional glass. Properties of a series of weight ratios of SiO 2 and UV326 were analyzed separately to ensure the appropriate content. Herein, SiO 2 particles and UV absorber (UV326) were used to ensure the multifunctional properties. In this work, the multifunctional glass with hydrophobicity, self-cleaning and UV-shielding properties was fabricated by coating a transparent styrene-ethylene-butylene-styrene triblock copolymer (SEBS) coating on the glass. However, the hydrophilic nature of traditional glass makes the dust in the air is easy to deposit on the surface, and the poor ultraviolet (UV) shielding efficiency will limit the application areas. Glass is widely used in outdoor living areas such as buildings and optical sensors to pursuit people's expected living standards.
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