3 Publications found with the applied filter.
2016
- Adrian Ehrenhofer, Gert Bingel, Georgi Paschew, Marcus Tietze, Raoul Schröder, Andreas Richter, Thomas Wallmersperger, "Permeation control in hydrogel-layered patterned PET membranes with defined switchable pore geometry – Experiments and numerical simulation", In Sensors and Actuators B: Chemical, vol. 232, pp. 499 - 505, 2016. [doi] [Bibtex & Downloads]
Permeation control in hydrogel-layered patterned PET membranes with defined switchable pore geometry – Experiments and numerical simulation
×Reference
Adrian Ehrenhofer, Gert Bingel, Georgi Paschew, Marcus Tietze, Raoul Schröder, Andreas Richter, Thomas Wallmersperger, "Permeation control in hydrogel-layered patterned PET membranes with defined switchable pore geometry – Experiments and numerical simulation", In Sensors and Actuators B: Chemical, vol. 232, pp. 499 - 505, 2016. [doi]
Bibtex
@article{EHRENHOFER2016499,
title = "Permeation control in hydrogel-layered patterned PET membranes with defined switchable pore geometry – Experiments and numerical simulation",
journal = "Sensors and Actuators B: Chemical",
volume = "232",
number = "",
pages = "499 - 505",
year = "2016",
note = "",
issn = "0925-4005",
doi = "http://dx.doi.org/10.1016/j.snb.2016.03.152",
url = "http://www.sciencedirect.com/science/article/pii/S0925400516304464",
author = "Adrian Ehrenhofer and Gert Bingel and Georgi Paschew and Marcus Tietze and Raoul Schröder and Andreas Richter and Thomas Wallmersperger",
keywords = "Polymeric membranes",
keywords = "Finite element simulation",
keywords = "Hydrogel swelling",
keywords = "Microfluidics",
keywords = "Micromechanical pore valve",
keywords = "Particle separation"
}Downloads
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- Adrian Ehrenhofer, Thomas Wallmersperger, Andreas Richter, "Simulation of controllable permeation in PNIPAAm coated membranes", vol. 9800, pp. 980016-980016-13, 2016. [doi] [Bibtex & Downloads]
Simulation of controllable permeation in PNIPAAm coated membranes
×Reference
Adrian Ehrenhofer, Thomas Wallmersperger, Andreas Richter, "Simulation of controllable permeation in PNIPAAm coated membranes", vol. 9800, pp. 980016-980016-13, 2016. [doi]
Abstract
Membranes separate fluid compartments and can comprise transport structures for selective permeation. In biology, channel proteins are specialized in their atomic structure to allow transport of specific compounds (selectivity). Conformational changes in protein structure allow the control of the permeation abilities by outer stimuli (gating). In polymeric membranes, the selectivity is due to electrostatic or size-exclusion. It can thus be controlled by size variation or electric charges. Controllable permeation can be useful to determine particle-size distributions in continuous flow, e.g. in microfluidics and biomedicine to gain cell diameter profiles in blood. The present approach uses patterned polyethylene terephthalate (PET) membranes with hydrogel surface coating for permeation control by size-exclusion. The thermosensitive hydrogel poly(N-isopropylacrylamide) (PNIPAAm) is structured with a cross-shaped pore geometry. A change in the temperature of the water flow through the membrane leads to a pore shape variation. The temperature dependent behavior of PNIPAAm can be numerically modeled with a temperature expansion model, where the swelling and deswelling is depicted by temperature dependent expansion coefficients. In the present study, the free swelling behavior was implemented to the Finite Element tool ABAQUS for the complex composite structure of the permeation control membrane. Experimental values of the geometry characteristics were derived from microscopy images with the tool Image J and compared to simulation results. Numerical simulations using the derived thermo-mechanical model for different pore geometries (circular, rectangle, cross and triangle) were performed. With this study, we show that the temperature expansion model with values from the free swelling behavior can be used to adequately predict the deformation behavior of the complex membrane system. The predictions can be used to optimize the behavior of the membrane pores and the overall performance of the smart membrane.
Bibtex
@proceeding{doi:10.1117/12.2219117,
author = {Ehrenhofer, Adrian and Wallmersperger, Thomas and Richter, Andreas},
title = {
Simulation of controllable permeation in PNIPAAm coated membranes
},
journal = {Proc. SPIE},
volume = {9800},
number = {},
pages = {980016-980016-13},
abstract = {
Membranes separate fluid compartments and can comprise transport structures for selective permeation. In biology, channel proteins are specialized in their atomic structure to allow transport of specific compounds (selectivity). Conformational changes in protein structure allow the control of the permeation abilities by outer stimuli (gating). In polymeric membranes, the selectivity is due to electrostatic or size-exclusion. It can thus be controlled by size variation or electric charges. Controllable permeation can be useful to determine particle-size distributions in continuous flow, e.g. in microfluidics and biomedicine to gain cell diameter profiles in blood. The present approach uses patterned polyethylene terephthalate (PET) membranes with hydrogel surface coating for permeation control by size-exclusion. The thermosensitive hydrogel poly(N-isopropylacrylamide) (PNIPAAm) is structured with a cross-shaped pore geometry. A change in the temperature of the water flow through the membrane leads to a pore shape variation. The temperature dependent behavior of PNIPAAm can be numerically modeled with a temperature expansion model, where the swelling and deswelling is depicted by temperature dependent expansion coefficients. In the present study, the free swelling behavior was implemented to the Finite Element tool ABAQUS for the complex composite structure of the permeation control membrane. Experimental values of the geometry characteristics were derived from microscopy images with the tool Image J and compared to simulation results. Numerical simulations using the derived thermo-mechanical model for different pore geometries (circular, rectangle, cross and triangle) were performed. With this study, we show that the temperature expansion model with values from the free swelling behavior can be used to adequately predict the deformation behavior of the complex membrane system. The predictions can be used to optimize the behavior of the membrane pores and the overall performance of the smart membrane.
},
year = {2016},
doi = {10.1117/12.2219117},
URL = { http://dx.doi.org/10.1117/12.2219117},
eprint = {}
}Downloads
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- Adrian Ehrenhofer, Gert Bingel, Georgi Paschew, Marcus Tietze, Raoul Schröder, Andreas Richter, Thomas Wallmersperger, "Permeation control in hydrogel-layered patterned PET membranes with defined switchable pore geometry–Experiments and numerical simulation", In Sensors and Actuators B: Chemical, Elsevier, vol. 232, pp. 499–505, 2016. [Bibtex & Downloads]
Permeation control in hydrogel-layered patterned PET membranes with defined switchable pore geometry–Experiments and numerical simulation
×Reference
Adrian Ehrenhofer, Gert Bingel, Georgi Paschew, Marcus Tietze, Raoul Schröder, Andreas Richter, Thomas Wallmersperger, "Permeation control in hydrogel-layered patterned PET membranes with defined switchable pore geometry–Experiments and numerical simulation", In Sensors and Actuators B: Chemical, Elsevier, vol. 232, pp. 499–505, 2016.
Bibtex
@article{ehrenhofer2016permeation,
title={Permeation control in hydrogel-layered patterned PET membranes with defined switchable pore geometry--Experiments and numerical simulation},
author={Ehrenhofer, Adrian and Bingel, Gert and Paschew, Georgi and Tietze, Marcus and Schr{\"o}der, Raoul and Richter, Andreas and Wallmersperger, Thomas},
journal={Sensors and Actuators B: Chemical},
volume={232},
pages={499--505},
year={2016},
publisher={Elsevier}
}Downloads
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