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Viscoelastic properties of a mixed culture biofilm from rheometer creep analysis

Towler, Brett W., Rupp, Cory J., Cunningham, Al B. and Stoodley, Paul (2003) Viscoelastic properties of a mixed culture biofilm from rheometer creep analysis Biofouling, 19, (5), pp. 279-285. (doi:10.1080/0892701031000152470).

Record type: Article


The mechanical properties of mixed culture biofilms were determined by creep analysis using an AR1000 rotating disk rheometer. The biofilms were grown directly on the rheometer disks which were rotated in a chemostat for 12 d. The resulting biofilms were heterogeneous and ranged from 35 microns to 50 microns in thickness. The creep curves were all viscoelastic in nature. The close agreement between stress and strain ratio of a sample tested at 0.1 and 0.5 Pa suggested that the biofilms were tested in the linear viscoelastic range and supported the use of linear viscoelastic theory in the development of a constitutive law. The experimental data was fit to a 4-element Burger spring and dashpot model. The shear modulus (G) ranged from 0.2 to 24 Pa and the viscous coefficient (eta) from 10 to 3000 Pa. These values were in the same range as those previously estimated from fluid shear deformation of biofilms in flow cells. A viscoelastic biofilm model will help to predict shear related biofilm phenomena such as elevated pressure drop, detachment, and the flow of biofilms over solid surfaces.

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Published date: October 2003
Organisations: Engineering Mats & Surface Engineerg Gp


Local EPrints ID: 157127
ISSN: 0892-7014
PURE UUID: 4c5edcf4-56c6-48d7-9f54-1dd14ba4d3fc

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Date deposited: 09 Jun 2010 11:02
Last modified: 18 Jul 2017 12:41

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Author: Brett W. Towler
Author: Cory J. Rupp
Author: Al B. Cunningham
Author: Paul Stoodley

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