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Adsorption of Xylog...
Adsorption of Xyloglucan onto Cellulose Surfaces of Different Morphologies : An Entropy-Driven Process
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- Benselfelt, Tobias (författare)
- KTH,Fiberteknologi,Wallenberg Wood Science Center
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- Cranston, Emily D. (författare)
- Department of Chemical Engineering, McMaster University
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- Ondaral, Sedat (författare)
- Department of Pulp and Paper Technology, Karadeniz Technical University
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- Johansson, Erik (författare)
- Cellutech AB
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- Brumer, Harry (författare)
- The Michael Smith Laboratories and the Department of Chemistry, The University of British Columbia
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- Rutland, Mark W. (författare)
- KTH,Yt- och korrosionsvetenskap
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- Wågberg, Lars (författare)
- KTH,Fiberteknologi,Wallenberg Wood Science Center
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(creator_code:org_t)
- 2016-08-17
- 2016
- Engelska.
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Ingår i: Biomacromolecules. - : American Chemical Society (ACS). - 1525-7797 .- 1526-4602. ; 17:9, s. 2801-2811
- Relaterad länk:
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https://urn.kb.se/re...
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https://doi.org/10.1...
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Abstract
Ämnesord
Stäng
- The temperature-dependence of xyloglucan (XG) adsorption onto smooth cellulose model films regenerated from N-methylmorpholine N-oxide (NMMO) was investigated using surface plasmon resonance spectroscopy, and it was found that the adsorbed amount increased with increasing temperature. This implies that the adsorption of XG to NMMO-regenerated cellulose is endothermic and supports the hypothesis that the adsorption of XG onto cellulose is an entropy-driven process. We suggest that XG adsorption is mainly driven by the release of water molecules from the highly hydrated cellulose surfaces and from the XG molecules, rather than through hydrogen bonding and van der Waals forces as previously suggested. To test this hypothesis, the adsorption of XG onto cellulose was studied using cellulose films with different morphologies prepared from cellulose nanocrystals (CNC), semicrystalline NMMO-regenerated cellulose, and amorphous cellulose regenerated from lithium chloride/dimethylacetamide. The total amount of high molecular weight xyloglucan (XGHMW) adsorbed was studied by quartz crystal microbalance and reflectometry measurements, and it was found that the adsorption was greatest on the amorphous cellulose followed by the CNC and NMMO-regenerated cellulose films. There was a significant correlation between the cellulose dry film thickness and the adsorbed XG amount, indicating that XG penetrated into the films. There was also a correlation between the swelling of the films and the adsorbed amounts and conformation of XG, which further strengthened the conclusion that the water content and the subsequent release of the water upon adsorption are important components of the adsorption process.
Ämnesord
- TEKNIK OCH TEKNOLOGIER -- Nanoteknik (hsv//swe)
- ENGINEERING AND TECHNOLOGY -- Nano-technology (hsv//eng)
- TEKNIK OCH TEKNOLOGIER -- Materialteknik -- Pappers-, massa- och fiberteknik (hsv//swe)
- ENGINEERING AND TECHNOLOGY -- Materials Engineering -- Paper, Pulp and Fiber Technology (hsv//eng)
- NATURVETENSKAP -- Kemi -- Polymerkemi (hsv//swe)
- NATURAL SCIENCES -- Chemical Sciences -- Polymer Chemistry (hsv//eng)
- NATURVETENSKAP -- Kemi -- Fysikalisk kemi (hsv//swe)
- NATURAL SCIENCES -- Chemical Sciences -- Physical Chemistry (hsv//eng)
- TEKNIK OCH TEKNOLOGIER -- Kemiteknik -- Polymerteknologi (hsv//swe)
- ENGINEERING AND TECHNOLOGY -- Chemical Engineering -- Polymer Technologies (hsv//eng)
Nyckelord
- Adsorption
- Amorphous films
- Cellulose
- Entropy
- Hydrogen bonds
- Molecules
- Oxide films
- Polymers
- Surface plasmon resonance
- Temperature distribution
- Van der Waals forces
- Cellulose nanocrystal (CNC)
- High molecular weight
- Increasing temperatures
- N methylmorpholine N oxide
- Reflectometry measurements
- Regenerated cellulose films
- Surface plasmon resonance spectroscopy
- Temperature dependence
- Fiber- och polymervetenskap
- Fibre and Polymer Science
Publikations- och innehållstyp
- ref (ämneskategori)
- art (ämneskategori)
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