Moisture sorption and diffusion in historical cellulose-based materials

Abstract

Moisture adsorption and diffusion were examined in 17 samples of historical and modern papers and cardboards, differing in the time of production and the pulping process. The moisture adsorption data for paper materials made of rags, gelatin-sized were close to each other whereas woodpulp papers showed higher intra-group variability due to varying contents of lignin and rosin sizing. The average adsorption curve for all specimens was close to that of pure cellulose. In-plane diffusivities along the paper sheets in a stack, primary direction of uptake and release moisture by library objects, were determined as a function of relative humidity and paper compression. Typically, the in-plane diffusivities fell within the range of 6 9 10 -6 -1.7 9 10 -5 m 2 /s and were significantly affected by the paper fraction in the specimens which were combination of paper sheets and thin air layers or pockets between the sheets. The external mass transfer coefficient at the surface of the paper objects perpendicular to the paper sheets exceeded 2 9 10 -3 m/s and significantly depended on the intensity of air motion in typical environments. Effective use of the adsorption and diffusion information obtained was demonstrated in modelling buffering capacities of books.

Multifunctional Green Sensor Prepared by Direct Laser Writing of Modified Wood Component

“…31 The mass loss peak at 100 °C is attributed to the residual water bonding to the hydrophilic sulfonic groups, which is difficult to be completely removed by the drying process. 32 The mass loss peak at 200 °C has been attributed to the degradation of polysaccharide (hemicelluloses) that is typically present as a byproduct of the NaLS manufacturing process. 8 The strongest mass loss peak at 300 °C belongs to NaLS degradation.…”

Indoor Air Quality Assessment at the Library of the National Observatory of Athens, Greece

“…Nevertheless, the structural features of the building (i.e., thick stone walls) maintain the RH at low levels and the hygric inertia ensures moisture balance by limiting relative humidity variations. The low RH variability in the library and the showcase, as well as the consequent smoothening of the short-term fluctuations could be attributed to the buffering capacity of the paper (Kupczak et al, 2018).…”

Construction and Performance of a Nanocellulose–Graphene-Based Humidity Sensor with a Fast Response and Excellent Stability

“…The films were quickly weighed ( W a ) after taking them out and then dried at 60 °C in an oven for 12 h to a constant weight, weighed ( W b ). The moisture adsorption ( M , g/g) was calculated according to eq . − Each test was performed in triplicate and averaged. …”