Pretreatment-dependent surface chemistry of wood nanocellulose for pH-sensitive hydrogels.
Bottom Line: The pre-treatments yielded a highly nanofibrillated material, with significant amounts of aldehyde and carboxyl groups.This is due to the swelling capacity of the 3D micro-porous structures, which have ionisable functional groups.In this study, we demonstrated that nanocellulose gels have a significantly higher swelling degree in neutral and alkaline conditions, compared to an acid environment (pH 3).
Affiliation: Paper and Fibre Research Institute (PFI) - Høgskoleringen 6b, Trondheim, Norway firstname.lastname@example.org.Show MeSH
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Mentions: According to Czaja et al.,21 the creation of a moist environment, the ability to control fluid loss and the absorption of exudates are important characteristics of a modern wound dressing. Such characteristics can be related to the porous structure and surface chemistry of the material. The porous structure of the CMNC sample is exemplified in Figure 5. Note the structure composed of pores in the micrometer scale (Figure 5(b) and (c)). The pores are defined by walls, which are composed of self-assembled cellulose nanofibrils.15 The CMNC sample, which was made in the presence of Ca2+, was smaller and apparently denser than the neat CMNC sample (Figure 5(a)). This is most probably due to the ionic links between the COO− groups and the Ca2+, which increased the cross-linking density and reduced the swelling capacity of the gel.Figure 5.
Affiliation: Paper and Fibre Research Institute (PFI) - Høgskoleringen 6b, Trondheim, Norway email@example.com.