Hydration and swelling of pulp fibers measured with differential scanning calorimetry

Maloney, Thaddeus; Paulapuro, Hannu; Stenius, Per

doi:10.3183/npprj-1998-13-01-p031-036

Cited by 100 publications

(90 citation statements)

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“…5A-5D), which were absent (or not explicit) in previous TP-DSC analysis of celluloses (Maloney et al 1998;Luukkonen et al 2001;Park et al 2006). Regarding these corrections, Fig.…”

Section: Thermoporometrymentioning

confidence: 99%

“…In this work sample freezing temperatures went down to -70°C, while previous TP-DSC analyses of celluloses were limited to -30°C (Park et al 2006) or -45°C (Maloney et al 1998;Luukkonen et al 2001). As indicated by Eq.…”

Section: Thermoporometrymentioning

confidence: 99%

“…NFW is estimated from the difference between total sample water and total freezing water (free water and freezing bound water). In this work, TP-DSC is performed with the strategy of step-by-step ice melting previously applied to celluloses (Maloney et al 1998;Luukkonen et al 2001;Park et al 2006). After freezing the wet sample, N sequential heating steps are performed.…”

Section: Theorymentioning

confidence: 99%

“…Pore volume in thermoporometry TP-DSC discriminates three types of water (Maloney et al 1998;Luukkonen et al 2001;Park et al 2006):…”

Section: Theorymentioning

confidence: 99%

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Dynamic vapor sorption and thermoporometry to probe water in celluloses

2012

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Dynamic vapor sorption and thermoporometry probe complementary dimensions of water interaction with cellulose. While sorption is primarily sensitive to the first hydration layers, thermoporometry is primarily sensitive to the nanometric water-filled pores. In this article, these analytical techniques are detailed and applied to model mesoporous materials and to a wide spectrum of celluloses. Correlations between techniques are explored. In dynamic vapor sorption, celluloses present a general characteristic time of desorption. On the other hand, they present highly variable characteristic times of sorption, indicating that material-specific properties may be inferred from sorption kinetics. Regarding thermoporometry, the thermodynamics of ice melting in irregular pore shapes is introduced. Moreover, in our thermoporometry analysis with differential scanning calorimeter, freezing temperature is extended to -70°C, allowing pores smaller than a few nanometers to be measured. Nevertheless, several data corrections are required for accurate thermoporometry at this condition. Comparisons between techniques show that sorption hysteresis is positively correlated with wet porosity. The presented developments and results will guide future application of these techniques to probe water in celluloses.

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“…5A-5D), which were absent (or not explicit) in previous TP-DSC analysis of celluloses (Maloney et al 1998;Luukkonen et al 2001;Park et al 2006). Regarding these corrections, Fig.…”

Section: Thermoporometrymentioning

confidence: 99%

Section: Thermoporometrymentioning

confidence: 99%

Section: Theorymentioning

confidence: 99%

“…Pore volume in thermoporometry TP-DSC discriminates three types of water (Maloney et al 1998;Luukkonen et al 2001;Park et al 2006):…”

Section: Theorymentioning

confidence: 99%

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Dynamic vapor sorption and thermoporometry to probe water in celluloses

2012

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“…Using NMR and ESR methods, Capitani et al (1990) came to the conclusion that water domains within cellulose somehow permeate cellulose domains, such that the two kinds of domains interact by hydrogen bonding. Using calorimetric methods, Maloney et al (1998) found evidence that bulk-like water was present within the larger mesopores of never-dried kraft fibers after their placement in water; by contrast, only bound water was present within the cell walls of previously dried cotton. Park et al (2006) showed that such considerations can be used to estimate the dimensions of nano-sized water-filled pores within cellulosic materials.…”

Section: Hydration and Hydrogen Bonding Effectsmentioning

confidence: 99%

Enhanced Absorbent Products Incorporating Cellulose and Its Derivatives: A Review

Hubbe¹,

Ayoub²,

Daystar³

et al. 2013

BioResources

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Cellulose and some cellulose derivatives can play vital roles in the enhancement of the performance of absorbent products. Cellulose itself, in the form of cellulosic fibers or nano-fibers, can provide structure, bulk, water-holding capacity, and channeling of fluids over a wide dimensional range. Likewise, cellulose derivatives such as carboxymethylcellulose (CMC) have been widely studied as components in superabsorbent polymer (SAP) formulations. The present review focuses on strategies and mechanisms in which inclusion of cellulose -in its various formscan enhance either the capacity or the rate of aqueous fluid absorption in various potential applications.

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