TY  - GEN
A1  - Maier, Philipp
A1  - Wolf, Jürgen
A1  - Keilig, Thomas
A1  - Krabbe, Alfred
A1  - Duffard, Rene
A1  - Ortiz, Jose-Luis
A1  - Klinkner, Sabine
A1  - Lengowski, Michael
A1  - Müller, Thomas
A1  - Lockowandt, Christian
A1  - Krockstedt, Christian
A1  - Kappelmann, Norbert
A1  - Stelzer, Beate
A1  - Werner, Klaus
A1  - Geier, Stephan Alfred
A1  - Kalkuhl, Christoph
A1  - Rauch, Thomas
A1  - Schanz, Thomas
A1  - Barnstedt, Jürgen
A1  - Conti, Lauro
A1  - Hanke, Lars
T1  - Towards a European Stratospheric Balloon Observatory
BT  - the ESBO design study
T2  - Ground-based and Airborne Telescopes VII
N2  - This paper presents the concept of a community-accessible stratospheric balloon-based observatory that is currently under preparation by a consortium of European research institutes and industry. We present the technical motivation, science case, instrumentation, and a two-stage image stabilization approach of the 0.5-m UV/visible platform. In addition, we briefly describe the novel mid-sized stabilized balloon gondola under design to carry telescopes in the 0.5 to 0.6 m range as well as the currently considered flight option for this platform. Secondly, we outline the scientific and technical motivation for a large balloon-based FIR telescope and the ESBO DS approach towards such an infrastructure.
KW  - astronomy
KW  - balloon telescopes
KW  - UV
KW  - far infrared
KW  - detectors
KW  - observatory
Y1  - 2018
SN  - 978-1-5106-1954-8
U6  - https://doi.org/10.1117/12.2319248
SN  - 0277-786X
SN  - 1996-756X
VL  - 10700
PB  - SPIE-INT Soc Optical Engineering
CY  - Bellingham
ER  - 
TY  - JOUR
A1  - Schwarze, Thomas
A1  - Kelling, Alexandra
A1  - Müller, Holger
A1  - Trautmann, Michael
A1  - Klamroth, Tillmann
A1  - Baumann, Otto
A1  - Strauch, Peter
A1  - Holdt, Hans-Jürgen
T1  - N-2-Pyridinylmethyl-N '-arylmethyl-diaminomaleonitriles: New Highly Selective Chromogenic Chemodosimeters for Copper(II)
JF  - Chemistry - a European journal
KW  - amides
KW  - chemodosimeter
KW  - colorimetric detection
KW  - copper
KW  - sensors
KW  - UV
KW  - Vis spectroscopy
Y1  - 2012
U6  - https://doi.org/10.1002/chem.201201731
SN  - 0947-6539
VL  - 18
IS  - 34
SP  - 10506
EP  - 10510
PB  - Wiley-VCH
CY  - Weinheim
ER  - 
TY  - JOUR
A1  - Gu, Sasa
A1  - Risse, Sebastian
A1  - Lu, Yan
A1  - Ballauff, Matthias
T1  - Mechanism of the oxidation of 3,3′,5,5′-tetramethylbenzidine catalyzed by peroxidase-like Pt nanoparticles immobilized in spherical polyelectrolyte brushes
BT  - a kinetic study
JF  - ChemPhysChem
N2  - Experimental and kinetic modelling studies are presented to investigate the mechanism of 3,3 ',5,5 '-tetramethylbenzidine (TMB) oxidation by hydrogen peroxide (H2O2) catalyzed by peroxidase-like Pt nanoparticles immobilized in spherical polyelectrolyte brushes (SPB-Pt). Due to the high stability of SPB-Pt colloidal, this reaction can be monitored precisely in situ by UV/VIS spectroscopy. The time-dependent concentration of the blue-colored oxidation product of TMB expressed by different kinetic models was used to simulate the experimental data by a genetic fitting algorithm. After falsifying the models with abundant experimental data, it is found that both H2O2 and TMB adsorb on the surface of Pt nanoparticles to react, indicating that the reaction follows the Langmuir-Hinshelwood mechanism. A true rate constant k, characterizing the rate-determining step of the reaction and which is independent on the amount of catalysts used, is obtained for the first time. Furthermore, it is found that the product adsorbes strongly on the surface of nanoparticles, thus inhibiting the reaction. The entire analysis provides a new perspective to study the catalytic mechanism and evaluate the catalytic activity of the peroxidase-like nanoparticles.
KW  - kinetics
KW  - nanoparticles
KW  - reaction mechanisms
KW  - spherical polyelectrolyte
KW  - brushes
KW  - UV
KW  - vis spectroscopy
Y1  - 2019
U6  - https://doi.org/10.1002/cphc.201901087
SN  - 1439-4235
SN  - 1439-7641
VL  - 21
IS  - 5
SP  - 450
EP  - 458
PB  - Wiley-VCH
CY  - Weinheim
ER  -