New simulation approach to mechanical properties of nanocellulose aerogels

Joonas Sorvari, Jukka Ketoja, Nikolai Beletski, Jenni Sievänen, Hans-Peter Hentze, Aki Kallonen, Marko Peura, Ritva Serimaa

Research output: Chapter in Book/Report/Conference proceedingConference article in proceedingsScientificpeer-review

Abstract

Highly porous, mechanically stable aerogels were prepared by freeze drying of nano-fibrillar-cellulose (NFC) suspensions. The NFC concentration was varied to alter the morphological structure and mechanical properties of the samples. Three dimensional samples were prepared and their compressibility was tested. The increase of NFC content and thus density clearly increased the mechanical strength. The pore morphology of the structures was investigated with SEM and X-ray tomography. The main feature in the structures was the formation of micron-sized nanocellulose sheets. From the 3D tomography image, we obtained 2D cross-sections that allowed the recording of microscopic geometric features. This structure was used to simulate the stresses and strains during compression with a rigid surface. The model considered a microscopic 2D structure formed from thin beams representing the NFC sheet-like layers. The microscopic model was implemented in a commercial FE-code. We also simulated similar artificial structures obtained by placing beams randomly in a rectangular cell. The resulting stress-strain curves were consistent with experimental findings. The sheet-like layers improve effectively the stiffness of the structures.
Original languageEnglish
Title of host publicationInternational Conference on Nanotechnology for the Forest Products Industry 2010
PublisherTAPPI Press
Pages759-776
Volume2
ISBN (Print)978-1-61839-001-1
Publication statusPublished - 2010
MoE publication typeA4 Article in a conference publication
Event2010 TAPPI International Conference on Nanotechnology for the Forest Product Industry - Dipoli Congress Centre, Espoo, Finland
Duration: 27 Sep 201029 Sep 2010
Conference number: 5

Conference

Conference2010 TAPPI International Conference on Nanotechnology for the Forest Product Industry
CountryFinland
CityEspoo
Period27/09/1029/09/10

Fingerprint

mechanical properties
cellulose
tomography
compressibility
freeze drying
X-radiation
sampling
cells

Keywords

  • aerogel
  • cellulose
  • nanofiber
  • modelling
  • simulation
  • mechanical properties
  • stiffness
  • deformation

Cite this

Sorvari, J., Ketoja, J., Beletski, N., Sievänen, J., Hentze, H-P., Kallonen, A., ... Serimaa, R. (2010). New simulation approach to mechanical properties of nanocellulose aerogels. In International Conference on Nanotechnology for the Forest Products Industry 2010 (Vol. 2, pp. 759-776). TAPPI Press.
Sorvari, Joonas ; Ketoja, Jukka ; Beletski, Nikolai ; Sievänen, Jenni ; Hentze, Hans-Peter ; Kallonen, Aki ; Peura, Marko ; Serimaa, Ritva. / New simulation approach to mechanical properties of nanocellulose aerogels. International Conference on Nanotechnology for the Forest Products Industry 2010. Vol. 2 TAPPI Press, 2010. pp. 759-776
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title = "New simulation approach to mechanical properties of nanocellulose aerogels",
abstract = "Highly porous, mechanically stable aerogels were prepared by freeze drying of nano-fibrillar-cellulose (NFC) suspensions. The NFC concentration was varied to alter the morphological structure and mechanical properties of the samples. Three dimensional samples were prepared and their compressibility was tested. The increase of NFC content and thus density clearly increased the mechanical strength. The pore morphology of the structures was investigated with SEM and X-ray tomography. The main feature in the structures was the formation of micron-sized nanocellulose sheets. From the 3D tomography image, we obtained 2D cross-sections that allowed the recording of microscopic geometric features. This structure was used to simulate the stresses and strains during compression with a rigid surface. The model considered a microscopic 2D structure formed from thin beams representing the NFC sheet-like layers. The microscopic model was implemented in a commercial FE-code. We also simulated similar artificial structures obtained by placing beams randomly in a rectangular cell. The resulting stress-strain curves were consistent with experimental findings. The sheet-like layers improve effectively the stiffness of the structures.",
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Sorvari, J, Ketoja, J, Beletski, N, Sievänen, J, Hentze, H-P, Kallonen, A, Peura, M & Serimaa, R 2010, New simulation approach to mechanical properties of nanocellulose aerogels. in International Conference on Nanotechnology for the Forest Products Industry 2010. vol. 2, TAPPI Press, pp. 759-776, 2010 TAPPI International Conference on Nanotechnology for the Forest Product Industry, Espoo, Finland, 27/09/10.

New simulation approach to mechanical properties of nanocellulose aerogels. / Sorvari, Joonas; Ketoja, Jukka; Beletski, Nikolai; Sievänen, Jenni; Hentze, Hans-Peter; Kallonen, Aki; Peura, Marko; Serimaa, Ritva.

International Conference on Nanotechnology for the Forest Products Industry 2010. Vol. 2 TAPPI Press, 2010. p. 759-776.

Research output: Chapter in Book/Report/Conference proceedingConference article in proceedingsScientificpeer-review

TY - GEN

T1 - New simulation approach to mechanical properties of nanocellulose aerogels

AU - Sorvari, Joonas

AU - Ketoja, Jukka

AU - Beletski, Nikolai

AU - Sievänen, Jenni

AU - Hentze, Hans-Peter

AU - Kallonen, Aki

AU - Peura, Marko

AU - Serimaa, Ritva

N1 - Project code: 70199

PY - 2010

Y1 - 2010

N2 - Highly porous, mechanically stable aerogels were prepared by freeze drying of nano-fibrillar-cellulose (NFC) suspensions. The NFC concentration was varied to alter the morphological structure and mechanical properties of the samples. Three dimensional samples were prepared and their compressibility was tested. The increase of NFC content and thus density clearly increased the mechanical strength. The pore morphology of the structures was investigated with SEM and X-ray tomography. The main feature in the structures was the formation of micron-sized nanocellulose sheets. From the 3D tomography image, we obtained 2D cross-sections that allowed the recording of microscopic geometric features. This structure was used to simulate the stresses and strains during compression with a rigid surface. The model considered a microscopic 2D structure formed from thin beams representing the NFC sheet-like layers. The microscopic model was implemented in a commercial FE-code. We also simulated similar artificial structures obtained by placing beams randomly in a rectangular cell. The resulting stress-strain curves were consistent with experimental findings. The sheet-like layers improve effectively the stiffness of the structures.

AB - Highly porous, mechanically stable aerogels were prepared by freeze drying of nano-fibrillar-cellulose (NFC) suspensions. The NFC concentration was varied to alter the morphological structure and mechanical properties of the samples. Three dimensional samples were prepared and their compressibility was tested. The increase of NFC content and thus density clearly increased the mechanical strength. The pore morphology of the structures was investigated with SEM and X-ray tomography. The main feature in the structures was the formation of micron-sized nanocellulose sheets. From the 3D tomography image, we obtained 2D cross-sections that allowed the recording of microscopic geometric features. This structure was used to simulate the stresses and strains during compression with a rigid surface. The model considered a microscopic 2D structure formed from thin beams representing the NFC sheet-like layers. The microscopic model was implemented in a commercial FE-code. We also simulated similar artificial structures obtained by placing beams randomly in a rectangular cell. The resulting stress-strain curves were consistent with experimental findings. The sheet-like layers improve effectively the stiffness of the structures.

KW - aerogel

KW - cellulose

KW - nanofiber

KW - modelling

KW - simulation

KW - mechanical properties

KW - stiffness

KW - deformation

UR - https://www.tappi.org/content/events/10nano/papers/14.4.pdf

M3 - Conference article in proceedings

SN - 978-1-61839-001-1

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SP - 759

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BT - International Conference on Nanotechnology for the Forest Products Industry 2010

PB - TAPPI Press

ER -

Sorvari J, Ketoja J, Beletski N, Sievänen J, Hentze H-P, Kallonen A et al. New simulation approach to mechanical properties of nanocellulose aerogels. In International Conference on Nanotechnology for the Forest Products Industry 2010. Vol. 2. TAPPI Press. 2010. p. 759-776