Water-cellulose interaction in wood pulp fiber suspensions studied by oxygen-17 and deuterium NMR relaxation. The effect of beating

Li, Tie Qiang; Henriksson, Ulf; Eriksson, Jan Christer; Oedberg, Lars

doi:10.1021/la00038a063

Cited by 12 publications

(13 citation statements)

References 1 publication

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“…Water molecules of microdroplets represent the``free water' ' . 6,7 Concerning the clusters, the fundamental vibrational frequencies of even tiny (H 2 O) 4 [(H 2 O) 5 ] clusters 14 at 3416 cm 2 1 (3360 cm 2 1 ) approach those of liquid water 10 at 3428 cm 2 1 . The 1.42±1.44 m m component of adsorbed water implies nonhydrogen-bonded (W 1) and partially hydrogen-bonded (W 2) vibrations of water.…”

Section: Resultsmentioning

confidence: 95%

“…W hile the surface coverage is sm aller than Q ø 1.5, only the second component of adsorbed water at 1.53±1.55 m m is present. This component should be ascribed to the m olecules of``bound' water' ' , 6,7 that is, to the molecules in close contact with the surfaces of micro® brils. The spectral closeness of the 1.53±1.55 m m component of bound water to W3 suggests that it is hydrogen-bonded water.…”

Section: Resultsmentioning

confidence: 99%

“…With respect to adsorbed water, ultrahigh-frequency 6 (UHF) and nuclear magnetic resonance 7 experiments have revealed``bound' ' and``free' ' states of water. Molecules of bound water are dynamically perturbed by the contacting surfaces, whereas those of free water are not.…”

Section: Introductionmentioning

confidence: 99%

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Transformation of the Near-Infrared Bands of Cellulose Surface Hydroxyls under the Influence of Adsorbed Water Molecules

Švedas

2000

Appl Spectrosc

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Near-infrared absorption spectra of sulfite cellulose with a varied adsorbed water content were studied. Analysis of the spectra has been made on the basis of previously published relations and results of the cellulose surface hydroxyls' interaction with absorbed water. Spectra of the OH overtone region of 1.3–1.65 μm were deconvoluted to components of cellulose volume and surface hydroxyls as well as to those of absorbed water. Besides the 1.53–1.55 μm component of “bound” water, the 1.42–1.44 μm component of “free” water starts to grow as the surface coverage exceeds 1.5. Comparison of the peak positions of these water components with those of liquid water suggests that bound water is constituted of hydrogen-bonded molecules. The 1.42–1.44 μm component of free water implies nonhydrogen-bonded and partially hydrogen-bonded molecules. The whole 1.363 μm band and a part of the 1.424 μm band of surface hydroxyls turn into the 1.52–1.53 and 1.57–1.59 μm peaks, respectively, after attachment of H2O molecules. The red shift of the surface bands by approximately 780 cm−1 caused by the adsorbate is consistent with a shift of the fundamental OH band of silica gel. The possible chemical, morphological, and physical causes of the two 1.363 and 1.424 m surface hydroxyl bands are discussed.

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Section: Resultsmentioning

confidence: 95%

Section: Resultsmentioning

confidence: 99%

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Transformation of the Near-Infrared Bands of Cellulose Surface Hydroxyls under the Influence of Adsorbed Water Molecules

Švedas

2000

Appl Spectrosc

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“…2 H-NMR spectroscopy was employed to investigate cellulose films [58] and fibers, and to gain insights into the residence time and mobility of D 2 O in cellulose, which was determined to be about 1.5 ms in oriented fibers [59]. Furthermore, the diffusion behavior of water close to a solid cellulose surface was investigated by the same technique [60][61][62]. The basis for these measurements is the fact that liquid molecules close to a solid surface have different relaxation profiles to those in the bulk liquid, as a result of interactions at the solid-liquid interface.…”

Section: Scattering and Diffractionmentioning

confidence: 99%

Deuterium and Cellulose: A Comprehensive Review

Reishofer

Spirk

2015

Advances in Polymer Science

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This contribution summarizes achievements in the understanding of cellulose accessibility, structure, and function with a particular focus on its interactions with deuteration. This review is the first to explicitly devote a discussion to deuteration of cellulose and highlights remarkable new findings in cellulose research as a result of the development of new experimental approaches, from simple weighing of deuterated samples to sophisticated techniques such as small angle neutron scattering and 2 H-NMR spectroscopy.

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“…The effect is sufficiently pronounced that it can be used to estimate the predominant pore size of nanoporous materials (Park et al 2006;Hubbe et al 2007a). Indeed, nuclear magnetic resonance results (Li et al 1992) suggest that the water molecules closest to cellulose have a reorientation rate that is about 25 times slower than that of bulk water. According to Bellissent-Funel (2002), interfacial water adjacent to a hydrophilic surface can resemble super-cooled bulk water, which is characterized by unusually long-range correlations between the locations of neighboring molecules.…”

Section: Surface Composition Vs Pulping Conditionsmentioning

confidence: 99%

Colloidal stability and aggregation of lignocellulosic materials in aqueous suspension: A review

Hubbe

Rojas

2008

BioRes

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Aqueous dispersions of lignocellulosic materials are used in such fields as papermaking, pharmaceuticals, and preparation of cellulose-based composites. The present review article considers published literature dealing with the ability of cellulosic particle dispersions (fiber, fines, nanorods, etc.) to either remain well dispersed or to agglomerate in response to changes in the composition of the supporting electrolyte solution. In many respects, the colloidal stability and coagulation of lignocellulosics can be understood in terms of well-known concepts, including effects due to osmotic pressure arising from overlapping electrostatic double layers at the charged surfaces. Details of the morphology and surface properties of lignocellulosic materials give rise to a variety of colloidal behaviors that make them unique. Adjustments in aqueous conditions, including the pH, salt ions (type and valence), polymers (charged or uncharged), and surfactants can be used to control the dispersion stability of cellulose, lignin, or wood-extractive materials to serve a variety of applications.

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Water-cellulose interaction in wood pulp fiber suspensions studied by oxygen-17 and deuterium NMR relaxation. The effect of beating

Cited by 12 publications

References 1 publication

Transformation of the Near-Infrared Bands of Cellulose Surface Hydroxyls under the Influence of Adsorbed Water Molecules

Transformation of the Near-Infrared Bands of Cellulose Surface Hydroxyls under the Influence of Adsorbed Water Molecules

Deuterium and Cellulose: A Comprehensive Review

Colloidal stability and aggregation of lignocellulosic materials in aqueous suspension: A review

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