| People | Locations | Statistics |
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| Naji, M. |
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| Motta, Antonella |
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| Aletan, Dirar |
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| Mohamed, Tarek |
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| Ertürk, Emre |
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| Taccardi, Nicola |
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| Kononenko, Denys |
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| Petrov, R. H. | Madrid |
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| Alshaaer, Mazen | Brussels |
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| Bih, L. |
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| Casati, R. |
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| Muller, Hermance |
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| Kočí, Jan | Prague |
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| Šuljagić, Marija |
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| Kalteremidou, Kalliopi-Artemi | Brussels |
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| Azam, Siraj |
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| Ospanova, Alyiya |
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| Blanpain, Bart |
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| Ali, M. A. |
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| Popa, V. |
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| Rančić, M. |
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| Ollier, Nadège |
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| Azevedo, Nuno Monteiro |
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| Landes, Michael |
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| Rignanese, Gian-Marco |
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Penttilä, Paavo A.
Aalto University
in Cooperation with on an Cooperation-Score of 37%
Topics
Publications (12/12 displayed)
- 2024Insights into the action of phylogenetically diverse microbial expansins on the structure of cellulose microfibrilscitations
- 2022Effect of Moisture on Polymer Deconstruction in HCl Gas Hydrolysis of Woodcitations
- 2021Green Fabrication Approaches of Lignin Nanoparticles from Different Technical Lignins : A Comparison Studycitations
- 2021Deswelling of microfibril bundles in drying wood studied by small-angle neutron scattering and molecular dynamicscitations
- 2021Green Fabrication Approaches of Lignin Nanoparticles from Different Technical Ligninscitations
- 2021Water-accessibility of interfibrillar spaces in spruce wood cell wallscitations
- 2020Observing microfibril bundles in wood by small-angle neutron scattering
- 2020Bundling of cellulose microfibrils in native and polyethylene glycol-containing wood cell walls revealed by small-angle neutron scatteringcitations
- 2020Bundling of cellulose microfibrils in native and polyethylene glycol-containing wood cell walls revealed by small-angle neutron scatteringcitations
- 2020Moisture-related changes in the nanostructure of woods studied with X-ray and neutron scatteringcitations
- 2019Small-angle scattering model for efficient characterization of wood nanostructure and moisture behaviourcitations
- 2013Small-angle scattering study of structural changes in the microfibril network of nanocellulose during enzymatic hydrolysiscitations
Places of action
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document
Observing microfibril bundles in wood by small-angle neutron scattering
Abstract
Observing microfibril bundles in wood by smallangle neutron scattering<br/>Cellulose is present in the cell walls of wood in the form of partially crystalline microfibrils, with a thickness of 2–3 nm. Lateral aggregation of the microfibrils into bundles, also termed macrofibrils, in the secondary cell walls has been reported by various methods (Sarkar et al. 2009; Adobes-Vidal et al. 2020), including atomic force microscopy, electron microscopy and electron tomography. The lateral size of microfibril bundles is usually in the range 15–20 nm, with some hemicelluloses and water ncluded within the bundle. However, none of the methods used so far has been able to observe these structures in their truly native state, as part of an intact cell wall structure and hydrated by liquid water.<br/><br/>Neutron and X-ray scattering are excellent tools for non-invasive characterization of the hierarchical structure of wood and other cellulosic materials (Rongpipi et al. 2019). With these methods, the properties of cellulose crystals and the packing of microfibrils can be analysed under various external conditions such as different humidity levels (Penttilä et al. 2020a). In the current work, we utilized small-angle neutron scattering (SANS) together with contrast variation by poly(ethylene glycol) (PEG) to assign a specific contribution in the SANS intensities of native wood to the outer dimensions of cellulose microfibril bundles (Penttilä et al. 2020b). This allowed us to detect the presence of microfibril bundles in the cell walls of different types of wood and to determine their diameter also in wood samples without PEG.