Jan Oberländer
RWTH Aachen University
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Featured researches published by Jan Oberländer.
Sensors | 2015
Jan Oberländer; Zaid B. Jildeh; Patrick Kirchner; Luisa Wendeler; Alexander Bromm; Heiko Iken; Patrick Wagner; Michael Keusgen; Michael J. Schöning
In this work, a sensor to evaluate sterilization processes with hydrogen peroxide vapor has been characterized. Experimental, analytical and numerical methods were applied to evaluate and study the sensor behavior. The sensor set-up is based on planar interdigitated electrodes. The interdigitated electrode structure consists of 614 electrode fingers spanning over a total sensing area of 20 mm2. Sensor measurements were conducted with and without microbiological spores as well as after an industrial sterilization protocol. The measurements were verified using an analytical expression based on a first-order elliptical integral. A model based on the finite element method with periodic boundary conditions in two dimensions was developed and utilized to validate the experimental findings.
Biosensors and Bioelectronics | 2018
Jan Oberländer; Marlena Mayer; Anton Greeff; Michael Keusgen; Michael J. Schöning
In this work, a spore-based biosensor is evaluated to monitor the microbicidal efficacy of sterilization processes applying gaseous hydrogen peroxide (H2O2). The sensor is based on interdigitated electrode structures (IDEs) that have been fabricated by means of thin-film technologies. Impedimetric measurements are applied to study the effect of sterilization process on spores of Bacillus atrophaeus. This resilient microorganism is commonly used in industry to proof the sterilization efficiency. The sensor measurements are accompanied by conventional microbiological challenge tests, as well as morphological characterizations with scanning electron microscopy (SEM) and transmission electron microscopy (TEM). The sensor measurements are correlated with the microbiological test routines. In both methods, namely the sensor-based and microbiological one, a tailing effect has been observed. The results are evaluated and discussed in a three-dimensional calibration plot demonstrating the sensors suitability to enable a rapid process decision in terms of a successfully performed sterilization.
Nanomaterials | 2018
Zaid B. Jildeh; Jan Oberländer; Patrick Kirchner; Patrick Wagner; Michael J. Schöning
In this article, we present an overview on the thermocatalytic reaction of hydrogen peroxide (H2O2) gas on a manganese (IV) oxide (MnO2) catalytic structure. The principle of operation and manufacturing techniques are introduced for a calorimetric H2O2 gas sensor based on porous MnO2. Results from surface analyses by X-ray photoelectron spectroscopy (XPS) and scanning electron microscopy (SEM) of the catalytic material provide indication of the H2O2 dissociation reaction schemes. The correlation between theory and the experiments is documented in numerical models of the catalytic reaction. The aim of the numerical models is to provide further information on the reaction kinetics and performance enhancement of the porous MnO2 catalyst.
Archive | 2017
Julio Arreola; Jan Oberländer; Michael Keusgen; Michael J. Schöning
The use of microbiological tests is the state-of-the-art method to validate the efficacy of several sterilization processes, for instance, gaseous H2O2 from aseptic filling machines. [...]
Sensors and Actuators B-chemical | 2012
Patrick Kirchner; Jan Oberländer; Peter Friedrich; Jörg Berger; Gunnar Rysstad; Michael Keusgen; Michael J. Schöning
Food Control | 2013
Patrick Kirchner; Jan Oberländer; Henri-Pierre Suso; Gunnar Rysstad; Michael Keusgen; Michael J. Schöning
Physica Status Solidi (a) | 2011
Patrick Kirchner; Jan Oberländer; Peter Friedrich; Jörg Berger; Henri-Pierre Suso; Andriy Kupyna; Michael Keusgen; Michael J. Schöning
Physica Status Solidi (a) | 2014
Jan Oberländer; Patrick Kirchner; Hans-Gerd Boyen; Michael J. Schöning
Physica Status Solidi (a) | 2015
Jan Oberländer; Alexander Bromm; Luisa Wendeler; Heiko Iken; Marlena Palomar Durán; Anton Greeff; Patrick Kirchner; Michael Keusgen; Michael J. Schöning
Electrochimica Acta | 2015
Jan Oberländer; Patrick Kirchner; Michael Keusgen; Michael J. Schöning