4.5 Article

Experimental determination and modelling of the swelling speed of a hydrogel polymer

Journal

MATERIALS RESEARCH EXPRESS
Volume 5, Issue 3, Pages -

Publisher

IOP PUBLISHING LTD
DOI: 10.1088/2053-1591/aab069

Keywords

hygroscopic swelling; atomic force microscopy; confocal microscopy; finite element modelling; coupled diffusion and deformation; circular hough transformation

Funding

  1. Hungarian Government [VKSZ_12-1-2013-0080]
  2. National Research, Development and Innovation Fund (NRDIF) [VKSZ_12-1-2013-0080]

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When a hydrophilic intraocular lens material is immersed, its volume and mass start increase due to the diffusion of water (or isotonic saline solution) reaching a quasi-equilibrium in a time scale of several hours. Here, we present a combination of atomic force and confocal microscopy to measure the axial swelling speed of such polymers in distilled water. The measurements are used for the experimental verification of a simplistic finite element model developed for engineering applications in COMSOL environment. The model is calibrated with the temporal change of the sample mass. The swelling velocity is found to be inversely proportional to the square root of time.

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