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The effect of steric hindrance on the packing of elongated objects

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Research report / Department of Physics, University of Jyväskylä
Authors
Ekman, Axel
Date
2016
Discipline
Fysiikka

 
Fibres of various materials can be deposited to form planar mats of fibres. These kinds of structures have gained substantial attention owing to their direct relation to both large industrial fields, such as paper and nonwovens, and biological structures, such as natural networks of fibrin, actin and collagen. In addition, similar structures are important in new emerging fields such as flexible electronics and tissue engineering. The physical properties of these structures are directly related to the connectivity of the network, thus a thorough understanding of the contact formation of the system is of great importance from both a scientific viewpoint as well as for its application in the engineering of such structures. In this Thesis we extend on the work regarding the structure of such random networks by considering, in more detail, the effect of the steric hindrance between the constituents. Most notably, we find that even if the effect on averaged properties in many cases can be negligible, its effect on statistical properties of the contact formation remains substantial even for dilute systems. ...
Publisher
University of Jyväskylä
ISBN
978-951-39-6532-7
ISSN Search the Publication Forum
0075-465X
Contains publications
  • Artikkeli I: Ekman, A., Miettinen, A., Turpeinen, T., Backfolk, K., & Timonen, J. (2012). The number of contacts in random fibre networks. Nordic Pulp & Paper Research Journal, 27(2), 270-276. DOI: 10.3183/NPPRJ-2012-27-02-p270-276
  • Artikkeli II: Ekman, A., Miettinen, A., Tallinen, T., & Timonen, J. (2014). Contact formation in random networks of elongated objects. Physical Review Letters, 113(26), Article 268001. DOI: 10.1103/PhysRevLett.113.268001
  • Artikkeli III: Al-Qararah, A. M., Ekman, A., Hjelt, T., Ketoja, J. A., Kiiskinen, H., Koponen, A., & Timonen, J. (2015). A unique microstructure of the fiber networks deposited from foam-fiber suspensions. Colloids and Surfaces A: Physicochemical and Engineering Aspects, 482(5 October), 544-553. DOI: 10.1016/j.colsurfa.2015.07.010
  • Artikkeli IV: Al-Qararah, A. M., Ekman, A., Hjelt, T., Kiiskinen, H., Timonen, J., & Ketoja, J. A. (2016). Porous structure of fibre networks formed by a foaming process : a comparative study of different characterization techniques. Journal of Microscopy, 264(1), 88-101. DOI: 10.1111/jmi.12420
  • Artikkeli V: Ekman, A., Tallinen, T. & Timonen, J. (2015). Excess of end contacts in networks of randomly-packed finite rods. Submitted.
  • Artikkeli VI: Koponen, A., Ekman, A., Mattila, K., Al-Qararah, A. M., & Timonen, J. (2017). The Effect of Void Structure on the Permeability of Fibrous Networks. Transport in Porous Media, 117(2), 247-259. DOI: 10.1007/s11242-017-0831-2
Keywords
satunnaiset verkot numeerinen simulaatio huokoinen aine röntgentomografia random networks numerical simulation porous material X-ray tomography materiaalitutkimus materiaalit kuidut fysikaaliset ominaisuudet huokoisuus verkkoteoria numeeriset menetelmät simulointi röntgentutkimus tomografia
URI

http://urn.fi/URN:ISBN:978-951-39-6532-7

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