Dr. Margarita Guenther Profile

Dr. Margarita Guenther

at TU Dresden

SPIE Involvement:

Author

Publications (14)

Proceedings Article | 13 March 2019 Paper

Experimental determination of material parameters for an enhanced modeling of polyelectrolyte gels

Beatrice Mau, Jan Erfkamp, Margarita Guenther , Thomas Wallmersperger

Proceedings Volume 10966, 109661O (2019) https://doi.org/10.1117/12.2513180

KEYWORDS: Solids, Ions, Polymers, Sensors

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Proceedings Article | 2 April 2015 Paper

Force-compensated hydrogel-based pH sensor

Kangfa Deng, Gerald Gerlach, Margarita Guenther

Proceedings Volume 9431, 943112 (2015) https://doi.org/10.1117/12.2084171

KEYWORDS: Sensors, Actuators, Prototyping, Transducers, Silicon, Temperature metrology, Particles, Chemical elements, Convection, Microsystems

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Proceedings Article | 8 March 2014 Paper

Actuation and buckling effects in IPMCs

Paola Nardinocchi, Matteo Pezzulla, Barbar Akle, Margarita Guenther, Thomas Wallmersperger

Proceedings Volume 9056, 90560K (2014) https://doi.org/10.1117/12.2044470

KEYWORDS: Electrodes, Polymers, Ions, Metals, Transducers, Electroluminescent displays, Actuators, Energy harvesting, 3D modeling, Calibration

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Proceedings Article | 29 March 2011 Paper

Biochemical microsensors on the basis of metabolically sensitive hydrogels

Margarita Günther, Gerald Gerlach, Thomas Wallmersperger, Florian Solzbacher, Jules Magda, Genyao Lin, Prashant Tathireddy, Michael Orthner

Proceedings Volume 7976, 79762D (2011) https://doi.org/10.1117/12.880460

KEYWORDS: Sensors, Glucose, Polymers, Transducers, Blood, In vitro testing, Chemical fiber sensors, Silicon, Temperature metrology, Microsensors

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Proceedings Article | 29 March 2011 Paper

Chemo-electro-mechanical modeling of pH-sensitive hydrogels

Thomas Wallmersperger, Karsten Keller, Bernd Kröplin, Margarita Günther, Gerald Gerlach

Proceedings Volume 7976, 79761O (2011) https://doi.org/10.1117/12.880374

KEYWORDS: Ions, Chemical elements, Polymers, Finite element methods, Actuators, Sensors, Numerical simulations, Liquids, Diffusion, Sodium

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Proceedings Article | 9 April 2010 Paper

Thermo-chemo-electro-mechanical modeling of polyelectrolyte gels

Thomas Wallmersperger, Karsten Keller, Bernd Kröplin, Margarita Günther, Gerald Gerlach

Proceedings Volume 7642, 76421N (2010) https://doi.org/10.1117/12.847512

KEYWORDS: Ions, Numerical simulations, Polymers, Thermal modeling, Finite element methods, Calibration, Temperature metrology, Actuators, Polymeric actuators, Diffusion

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Proceedings Article | 9 April 2010 Paper

Hydrogel-based piezoresistive biochemical microsensors

Margarita Guenther, Volker Schulz, Gerald Gerlach, Thomas Wallmersperger, Florian Solzbacher, Jules Magda, Prashant Tathireddy, Genyao Lin, Michael Orthner

Proceedings Volume 7642, 764227 (2010) https://doi.org/10.1117/12.847373

KEYWORDS: Sensors, Glucose, In vitro testing, Blood, Polymers, Transducers, Chemical fiber sensors, Calibration, Silicon, Microfabrication

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Proceedings Article | 19 May 2009 Paper

Piezoresistive chemical sensors based on hydrogels

Margarita Guenther, Gerald Gerlach, Thomas Wallmersperger

Proceedings Volume 7362, 736218 (2009) https://doi.org/10.1117/12.821335

KEYWORDS: Sensors, Polymers, Chemical fiber sensors, Ions, Silicon, Polymeric sensors, Chemical analysis, Metals, Diffusion, Proteins

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Proceedings Article | 6 April 2009 Paper

In vitro investigations of a pH- and ionic-strength-responsive polyelectrolytic hydrogel using a piezoresistive microsensor

Volker Schulz, Margarita Guenther, Gerald Gerlach, Jules Magda, Prashant Tathireddy, Loren Rieth, Florian Solzbacher

Proceedings Volume 7287, 728712 (2009) https://doi.org/10.1117/12.816478

KEYWORDS: Sensors, Transducers, Silicon, Microsensors, Polymers, Environmental sensing, Ionization, In vitro testing, Data modeling, Signal detection

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Proceedings Article | 6 April 2009 Paper

Modeling and experimental investigations of the sensitivity of piezoresistive chemical sensors based on polyelectrolytic hydrogels

Margarita Guenther, Gerald Gerlach, Thomas Wallmersperger, Volker Schulz

Proceedings Volume 7287, 72870U (2009) https://doi.org/10.1117/12.815274

KEYWORDS: Polymers, Sensors, Ions, Chemical fiber sensors, Metals, Polymeric sensors, Temperature metrology, Chemical analysis, Technetium, Silicon

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Proceedings Article | 10 April 2008 Paper

Coupled chemo-electro-mechanical simulation of polyelectrolyte gels as actuators and sensors

Thomas Wallmersperger, Dirk Ballhause, Bernd Kröplin, Margarita Günther, Zhangman Shi, Gerald Gerlach

Proceedings Volume 6927, 69270Y (2008) https://doi.org/10.1117/12.774639

KEYWORDS: Ions, Polymers, Sensors, Actuators, Diffusion, Chemical elements, Arsenic, Partial differential equations, Electroactive materials, Liquids

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Polyelectrolyte gels are ductile elastic electroactive materials. They consist of a polymer network with charged groups and a liquid phase with mobile ions. Changing the chemical or electric conditions in the gel-surrounding solution leads to a change of the chemo-electro-mechanical state in the gel phase: diffusion and migration of ions and solvent between the gel and solution phases trigger the swelling or shrinkage of the polymer gel. In case of chemical stimulation (change of pH or salt concentration), a swelling ratio of up to 100% may be obtained. Due to this large swelling ratio the gels exhibit excellent actuatoric capabilities. In this paper, a polyelectrolyte gel placed in a solution bath is investigated. The actuatoric and sensoric capabilities are described by a chemo-electro-mechanical model. The chemical field is represented by a convection-migration-diffusion equation while the electric field is described by a quasi-static Laplace equation. For the mechanical field a partial differential equation of first order in time is applied. Inertia effects are neglected due to the relatively slow swelling/shrinkage process. On the one hand, the coupling between the chemo-electrical and the mechanical field is realised by the differential osmotic pressure stemming from the concentration differences between gel and solution. On the other hand, the mechanical deformation influences the concentration of the bound charged groups in the gel. The three fields are solved simultaneously by applying the Newton Raphson method using finite elements in space and finite differences in time. The developed model is applicable for both, hydrogel actuators and sensors. Numerical results of swelling and bending are given for chemically and electrically stimulated polymer gels. In this paper we show the differences between the chemo-electric and the fully coupled chemo-electro-mechanical formulation for polymer gels in different solution baths. The inverse (sensor-) effect is demonstrated by the influence of the mechanical deformation on the gel, which results in a change of the chemical and electrical unknowns in the gel. The validity of the employed numerical model is shown by a comparison of the obtained results with experimental measurements.

Proceedings Article | 4 April 2007 Paper

Modeling of the nonlinear effects in pH sensors based on polyelectrolytic hydrogels

Margarita Guenther, Gerald Gerlach, Thomas Wallmersperger

Proceedings Volume 6524, 652417 (2007) https://doi.org/10.1117/12.713895

KEYWORDS: Sensors, Silicon, Ions, Polymers, Diffusion, Transducers, Ionization, Signal processing, Chemical fiber sensors, Interfaces

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Proceedings Article | 30 March 2006 Paper

Chemical sensors based on temperature-responsive hydrogels

Margarita Guenther, Gerald Gerlach, Dirk Kuckling, Katja Kretschmer, Cathrin Corten, Jens Weber, Joerg Sorber, Gunnar Suchaneck, Karl-Friedrich Arndt

Proceedings Volume 6167, 61670T (2006) https://doi.org/10.1117/12.657126

KEYWORDS: Sensors, Polymers, Bioalcohols, Chemical fiber sensors, Bismuth, Diffusion, Silicon, Temperature metrology, Polymeric sensors, Potassium

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Proceedings Article | 6 May 2005 Paper

pH sensors based on polyelectrolytic hydrogels

Margarita Guenther, Gerald Gerlach, Joerg Sorber, Gunnar Suchaneck, Karl Arndt, Andreas Richter

Proceedings Volume 5759, (2005) https://doi.org/10.1117/12.605293

KEYWORDS: Sensors, Ions, Polymers, Silicon, Diffusion, Transducers, Signal processing, Silicon films, Sodium, Chemical fiber sensors

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Showing 5 of 14 publications

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