The dynamic water vapour sorption behaviour of natural fibres and kinetic analysis using the parallel exponential kinetics model

Xie, Yanjun; Hill, Callum A. S.; Jalaludin, Zaihan; Curling, Simon; Anandjiwala, Rajesh D.; Norton, Andrew; Newman, Gary

doi:10.1007/s10853-010-4935-0

Cited by 113 publications

(106 citation statements)

References 54 publications

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“…Subsequently, the PEK model was also shown to provide excellent fits to the data for describing the sorption properties of regenerated cellulose fibres [21][22][23] and microcrystalline cellulose [24]. The application of the PEK model has also been demonstrated for wood samples [25] as well as a wide range of plant fibres [26]. The drying kinetics of various foodstuffs also obeys the PEK model [26].…”

Section: Introductionmentioning

confidence: 88%

Variation in the sorption properties of historic parchment evaluated by dynamic water vapour sorption

Popescu

Hill

Kennedy

2016

Journal of Cultural Heritage

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Section: Introductionmentioning

confidence: 88%

Variation in the sorption properties of historic parchment evaluated by dynamic water vapour sorption

Popescu

Hill

Kennedy

2016

Journal of Cultural Heritage

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“…Thus, as stress relaxation progresses, the equilibrium surface concentration changes. Several researchers have described sorption of water in the cell walls by a twostage process (Christensen 1965;Christensen and Hergt 1969;Xie et al 2011;Hill et al 2012) for which moisture uptake in the initial stage resembles a process controlled by Fickian diffusion. The second stage is slower and becomes increasingly dominant as the initial concentration of bound water is increased (Christensen 1965).…”

Section: Rate Of Sorptionmentioning

confidence: 99%

“…A similar behaviour has been reported for other swelling polymeric substances such as wool (Downes and Mackay 1958), hemicelluloses (Sadoh and Christensen 1964) and cellulose acetate (Bagley and Long 1955;Newns 1956). Hill and co-workers (Xie et al 2011;Hill et al 2012) have shown that from a mathematical standpoint, sorption kinetics can be modelled as a sum of two exponential decays: a relatively fast and a relatively slow process. Although it is argued in this work that sorption is controlled by relaxation, the apparent two-stage nature of sorption remains to be explained.…”

Section: Rate Of Sorptionmentioning

confidence: 99%

A critical discussion of the physics of wood–water interactions

et al. 2012

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This paper reviews recent findings on wood-water interaction and puts them into context of established knowledge in the field. Several new findings challenge prevalent theories and are critically discussed in an attempt to advance current knowledge and highlight gaps. The focus of this review is put on water in the broadest concept of wood products, that is, the living tree is not considered. Moreover, the review covers the basic wood-water relation, states and transitions. Secondary effects such as the ability of water to alter physical properties of wood are only discussed in cases where there is an influence on state and/or transition.

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“…The desorption kinetics were analyzed assuming that two parallel independent fi rst order kinetic processes are present, related to two different water binding sites. [ 33 ] Accordingly, the experimental data of Figure 2 b were fi tted to the equation saturated. The desorption kinetic data were satisfactorily fi tted to Equation ( 1) , and we obtained the values of 1.7 and 63 min for the exponential time constants τ 1 and τ 2 , respectively (mean value τ 1 = (2.2 ± 0.9) min and τ 2 = (50 ± 24) min calculated by a set of four replicated experiments using different NC fi lms).…”

Section: Film Structure Morphology and Structural Modifi Cations Dumentioning

confidence: 99%

Dynamics of Hydration of Nanocellulose Films

Bettotti

Maestri

Guider

et al. 2015

Adv Materials Inter

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The design of materials capable of mechanical responses to physical and chemical stimuli represents one of the most exciting and challenging areas of scientific research because of the huge number of their potential applications. This article is focused on the molecular events occurring in thin films of carboxylated nanocellulose fibers, which are capable of converting water gradients into mechanical movements at the macroscopic scale. The analysis of the mechano‐actuation, and of the conditions to obtain it, shows that the film movement is fast and reproducible, the gradient intensity is transduced into rate of displacement, and the response is observed at vapor pressures as low as 1.2 mm Hg. The actuation mechanism is associated to an efficient and reversible water sorption process by the hydrophilic nanocellulose fibers at the film interface. Conversely, water desorption is slow and follows a kinetic behavior supporting the presence of two binding sites for water molecules. The adsorbed water induces swelling of the surface nanocellulose layers and local structural rearrangement, however transitions between ordered and random coil conformations are not observed. The understanding of the actuation mechanisms of nanocellulose offers exciting opportunities to design macroscopic structures responding to chemical gradients by the assembly of simple molecular components.

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The dynamic water vapour sorption behaviour of natural fibres and kinetic analysis using the parallel exponential kinetics model

Cited by 113 publications

References 54 publications

Variation in the sorption properties of historic parchment evaluated by dynamic water vapour sorption

Variation in the sorption properties of historic parchment evaluated by dynamic water vapour sorption

A critical discussion of the physics of wood–water interactions

Dynamics of Hydration of Nanocellulose Films

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