Cross-sectional dimensions of fiber and pore networks based on Euclidean distance maps

Chinga, Gary; Solheim, Olav; Mörseburg, Kathrin

doi:10.3183/npprj-2007-22-04-p500-507

Cited by 11 publications

(8 citation statements)

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“…The magnification was 1,000×, giving a resolution of 50 nm. The images were thresholded and analyzed automatically with respect to the thickness and roughness (Chinga et al, 2007 b ).…”

Section: Methodsmentioning

confidence: 99%

Quantitative Electron Microscopy of Cellulose Nanofibril Structures from Eucalyptus and Pinus radiata Kraft Pulp Fibers

Chinga-Carrasco

Diserud

2011

Microsc Microanal

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This work comprises the structural characterization of Eucalyptus and Pinus radiata pulp fibers and their corresponding fibrillated materials, based on quantitative electron microscopy techniques. Compared to hardwood fibers, the softwood fibers have a relatively open structure of the fiber wall outer layers. The fibrillation of the fibers was performed mechanically and chemi-mechanically. In the chemi-mechanical process, the pulp fibers were subjected to a TEMPO-mediated oxidation to facilitate the homogenization. Films were made of the fibrillated materials to evaluate some structural properties. The thicknesses and roughnesses of the films were evaluated with standardized methods and with scanning electron microscopy (SEM), in backscattered electron imaging mode. Field-emission SEM (FE-SEM) and transmission electron microscopy (TEM) were performed to quantify the nanofibril morphology. In this study, we give additional and significant evidences about the suitability of electron microscopy techniques for quantification of nanofibril structures. In addition, we conclude that standard methods are not suitable for estimating the thickness of films having relatively rough surfaces. The results revealed significant differences with respect to the morphology of the fibrillated material. The differences are due to the starting raw material and to the procedure applied for the fibrillation.

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“…The magnification was 1,000×, giving a resolution of 50 nm. The images were thresholded and analyzed automatically with respect to the thickness and roughness (Chinga et al, 2007 b ).…”

Section: Methodsmentioning

confidence: 99%

Quantitative Electron Microscopy of Cellulose Nanofibril Structures from Eucalyptus and Pinus radiata Kraft Pulp Fibers

Chinga-Carrasco

Diserud

2011

Microsc Microanal

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“…The minimal investigated membrane length was 15 μm. The thickness was measured using ImageJ with a custom made PlugIn (Chinga et al, 2007). The active layer was manually removed from the support membrane in ImageJ.…”

Section: Scanning Electron Microscopy (Sem)mentioning

confidence: 99%

PVA/nanocellulose nanocomposite membranes for CO2 separation from flue gas

Torstensen

Helberg

Deng

et al. 2019

International Journal of Greenhouse Gas Control

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In this paper, we explore the use of nanocelluloses as an additive to poly (vinyl alcohol) (PVA) nanocomposite membranes for CO 2 /N 2 mixed-gas separation. Our findings are that several types of nanocellulose can be used to improve membrane performance. PVA/cellulose nanocrystals (CNC) nanocomposite membranes have the most promising performance, with increased CO 2 permeance (127.8 ± 5.5 GPU) and increased CO 2 /N 2 separation factor (39 ± 0.4) compared to PVA composite membranes, with permeance 105.5 ± 1.9 GPU and separation factor 36 ± 0.5. The performance of PVA/CNC membranes is similar compared to PVA/carbon nanotubes (CNTs) membranes shown earlier. Thus, CNTs can be replaced by CNC that is biodegradable and non-toxic. Investigating several different nanocellulose types reveal that a high nanocellulose charge and small nano-cellulose particles are important nanocellulose traits that improve membrane performance.

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“…The images had sizes of 2560 9 1920 pixels and a resolution of 0.1 lm/pixel. The cross-sectional analysis was performed according to Chinga et al (2007b). The porosity and porosity distribution in the z-direction were assessed.…”

Section: Scanning Electron Microscopy Analysismentioning

confidence: 99%

Assessing the combined benefits of clay and nanofibrillated cellulose in layered TMP-based sheets

Mörseburg

Chinga-Carrasco

2009

Cellulose

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A new concept for both furnish composition and z-directional furnish arrangement involving the interaction between specific thermo-mechanical pulp fractions (TMP), nanofibrillated cellulose (NFC) and clay in oriented layered laboratory sheets is presented. Used separately, NFC improves the strength properties of paper while fillers enhance the optical properties. Synergy effects of clay-NFC interactions are assessed. The study comprises a structural assessment, including laser profilometry, scanning electron microscopy (SEM) and field-emission (FE)-SEM analyses. In addition, optical and strength properties are assessed. It is demonstrated that a potential reduction of strength properties caused by filler addition may be counteracted by appropriate NFC addition to specific layers in the zdirection. Based on an estimation of an overall quality index considering five variables, it is concluded that the best sheet construction is obtained when placing the fillers in surface layers with the TMP accept fraction and the NFC in the centre of the sheets together with the refined TMP reject fraction.

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Cross-sectional dimensions of fiber and pore networks based on Euclidean distance maps

Cited by 11 publications

References 0 publications

Quantitative Electron Microscopy of Cellulose Nanofibril Structures from Eucalyptus and Pinus radiata Kraft Pulp Fibers

Quantitative Electron Microscopy of Cellulose Nanofibril Structures from Eucalyptus and Pinus radiata Kraft Pulp Fibers

PVA/nanocellulose nanocomposite membranes for CO2 separation from flue gas

Assessing the combined benefits of clay and nanofibrillated cellulose in layered TMP-based sheets

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