Investigation of oxygen transfer through the membrane of polymer hollowspheres by oxygen micro-electrodes

Wiesmann, R.; Zimelka, W.; Baumgärtl, H.; Götz, Peter

doi:10.1016/0168-1656(94)90208-9

Cited by 9 publications

(1 citation statement)

References 15 publications

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“…Transport within the microcapsule normally depends on diffusion. However, slow diffusion in the microcapsules can render the whole process uneconomic 1,2. A new approach was used to accelerate the transport process within the microcapsule by introducing convection inside the capsule.…”

Section: Introductionmentioning

confidence: 99%

Investigation of Transport Phenomena Inside a Microcapsule

Goubergrits

Affeld

Debaene

et al. 2002

Annals of the New York Academy of Sciences

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Mass transfer within a microcapsule is enhanced by convection, achieved by introducing a movable body inside the microcapsule. This body has a different density from the fluid within the microcapsule and can be moved relative to the microcapsule by application of an external force, such as a magnetic field or acceleration/deceleration. The effect of the transport improvement was investigated as a function of the Peclet number (Pe) by using computational fluid dynamics and particle image velocimetry. The results show that the period to achieve 80% saturation in the microcapsule was reduced by 60% with a movable body with half of the diameter of the microcapsule and Pe = 600, compared to the mass transport in the microcapsule with a non-movable body.

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Section: Introductionmentioning

confidence: 99%

Investigation of Transport Phenomena Inside a Microcapsule

Goubergrits

Affeld

Debaene

et al. 2002

Annals of the New York Academy of Sciences

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Cell Immobilization: Engineering Aspects

Willaert

2009

Encyclopedia of Industrial Biotechnology

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The performance of immobilized cells is influenced by mass transport of substrates to the cells and of products from the cells to the bulk fluid, as well as the cell growth in the immobilization matrix. Both internal and external mass transfer limitations have to be considered in the design of immobilized cell systems. In this article, the various methods of measurement of the diffusion coefficient are reviewed. The influence of the presence and growth of living cells in the immobilization matrix on the diffusion coefficient is discussed. Internal diffusion in gel systems, microcapsules, and dense cell masses, that is biofilms, bioflocs, and mammalian cell aggregates is treated in detail, as well as internal mass transport by convection is considered. Finally, the mathematical modeling of reaction–diffusion systems of immobilized cells is discussed, with special attention to gel entrapment and microencapsulation.

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