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On the morphology o...
On the morphology of cellulose nanofibrils obtained by TEMPO-mediated oxidation and mechanical treatment
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- Gamelas, José A. F. (author)
- University of Coimbra, Portugal
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- Pedrosa, Jorge (author)
- University of Coimbra, Portugal
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- Lourenco, Ana F. (author)
- University of Coimbra, Portugal
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- Mutjo, Peré (author)
- University of Girona, Spain
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- Gonzalez, Israel (author)
- University of Girona, Spain
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- Chinga-Carrasco, Gary (author)
- RISE,PFI – Paper and Fiber Research Institute
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- Singh, Gurvinder (author)
- NTNU Norwegian University of Science and Technology, Norway
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- Ferreira, Paulo J. T. (author)
- University of Coimbra, Portugal
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(creator_code:org_t)
- Elsevier BV, 2015
- 2015
- English.
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In: Micron. - : Elsevier BV. - 0968-4328 .- 1878-4291. ; 72, s. 28-33
- Related links:
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https://estudogeral....
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https://urn.kb.se/re...
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https://doi.org/10.1...
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Abstract
Subject headings
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- The morphological properties of cellulose nanofibrils obtained from eucalyptus pulp fibres were assessed. Two samples were produced with the same chemical treatment (NaClO/NaBr/TEMPO (2,2,6,6-tetramethylpiperidine-1-oxyl radical) oxidation), but distinct mechanical treatment intensities during homogenization. It was shown that the nanofibrils production yield increases with the mechanical energy. The effect of mechanical treatment on the yield was confirmed by laser profilometry of air-dried nanocellulose films. However, no significant differences were detected regarding the nanofibrils width as measured by atomic force microscopy (AFM) of air-dried films. On the other hand, differences in size were found either by laser diffraction spectroscopy or by dynamic light scattering (DLS) of the cellulose nanofibrils suspensions as a consequence of the differences in the length distribution of both samples. The nanofibrils length of the more nanofibrillated sample was calculated based on the width measured by AFM and the hydrodynamic diameter obtained by DLS. A length value of ca. 600. nm was estimated. The DLS hydrodynamic diameter, as an equivalent spherical diameter, was used to estimate the nanofibrils length assuming a cylinder with the same volume and with the diameter (width) assessed by AFM. A simple method is thus proposed to evaluate the cellulose nanofibrils length combining microscopy and light scattering methods.
Subject headings
- TEKNIK OCH TEKNOLOGIER -- Materialteknik -- Pappers-, massa- och fiberteknik (hsv//swe)
- ENGINEERING AND TECHNOLOGY -- Materials Engineering -- Paper, Pulp and Fiber Technology (hsv//eng)
- TEKNIK OCH TEKNOLOGIER -- Nanoteknik (hsv//swe)
- ENGINEERING AND TECHNOLOGY -- Nano-technology (hsv//eng)
Keyword
- Atomic force microscopy
- Dynamic light scattering
- Morphology
- Nanofribrillated cellulose
- Size
- TEMPO-oxidised cellulose nanofibrils
Publication and Content Type
- ref (subject category)
- art (subject category)
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