TY - CONF A1 - Rurack, Knut A1 - Descalzo, Ana B. A1 - Weißhoff, Hardy A1 - Martínez-Mánez, Ramon A1 - Marcos, M. Dolores A1 - Amorós, P. A1 - Hoffmann, Katrin A1 - Soto, J. T1 - A Chromo- and Fluorogenic Hybrid Chemosensor Material for the Detection of Long-chain Carboxylates T2 - ANAKON 2005 CY - Regensburg, Germany DA - 2005-03-15 PY - 2005 AN - OPUS4-7427 LA - eng AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER - TY - CONF A1 - Rurack, Knut A1 - Descalzo, Ana B. A1 - Weißhoff, Hardy A1 - Martínez-Mánez, Ramon A1 - Marcos, M. Dolores A1 - Hoffmann, Katrin A1 - Soto, J. T1 - A hybrid chemosensor material for the colorimetric and fluorometric detection of long-chain carboxylates T2 - 9th Conference on Methods and Applications of Fluorescence: Spectroscopy, Imaging and Probes CY - Lisbon, Portugal DA - 2005-09-04 PY - 2005 AN - OPUS4-7428 LA - eng AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER - TY - CONF A1 - Rurack, Knut A1 - Descalzo, Ana B. A1 - Martínez-Mánez, Ramon A1 - Radeglia, Reiner A1 - Soto, J. T1 - Novel Modular Sensors: Design of Efficient Probes for Various Analytes Utilizing the Phenoxazinone Chromophore T2 - Tag der Chemie CY - Potsdam, Germany DA - 2004-07-07 PY - 2004 AN - OPUS4-5353 LA - eng AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER - TY - CONF A1 - Rurack, Knut A1 - Bricks, J.L. A1 - Descalzo, Ana B. A1 - Garcia, B. A1 - Kovalchuck, Anton V. A1 - Martínez-Mánez, Ramon A1 - Sancenón, F. T1 - Macrocycles in a Different Light: The Influence of the Nature and Substitution Pattern of Heteroatoms on the Photophysics of Chromophore-Appended Crown Ethers T2 - 28th International Symposium on Macrocyclic Chemistry CY - Gdansk, Poland DA - 2003-07-13 PY - 2003 AN - OPUS4-4889 LA - eng AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER - TY - CONF A1 - Rurack, Knut A1 - Büschel, M. A1 - Daub, J. T1 - Intramolecular Charge-Transfer Characteristics of Fluorescent Donor-[Ethynyl-Donor]n (n=1,2) Dyads and Triads T2 - 8th Conference on Methods and Applications of Fluorescence: Spectroscopy, Imaging and Probes CY - Prague, Czech Republic DA - 2003-08-24 PY - 2003 AN - OPUS4-4894 LA - eng AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER - TY - CONF A1 - Rurack, Knut T1 - Test strip-based fluorescence detection of fluoride in aqueous media with a BODIPY-linked hydrogen bonding receptor T2 - International Conference on Photochemistry (ICP 2013) CY - Leuven, Belgium DA - 2013-07-21 PY - 2013 AN - OPUS4-28947 LA - deu AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER - TY - CONF A1 - Rurack, Knut A1 - Sarma, Dominik T1 - Preparation of hybrid particle architectures for single microparticle-based detection in suspension arrays using FRET T2 - Tag der Chemie 2013 CY - Potsdam, Germany DA - 2013-06-27 PY - 2013 AN - OPUS4-28948 LA - deu AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER - TY - CONF A1 - Rurack, Knut A1 - Descalzo López, Ana Belén T1 - Biomimetically Inspired Sensing of Ionic and Neutral Species with Organically Modified Mesoporous Silica Materials T2 - First International Conference on Multifunctional, Hybrid and Nanomaterials CY - Tours, France DA - 2009-03-15 PY - 2009 AN - OPUS4-20644 LA - deu AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER - TY - CONF A1 - Rurack, Knut A1 - Weller, Michael G. A1 - Dietrich, Paul A1 - Unger, Wolfgang T1 - Development and Characterization of a Photostable Boron-dipyrromethene Dye as a Versatile Probe of the Analysis of Surface Functional Groups T2 - Smart Surfaces 2012 CY - Dublin, Ireland DA - 2012-03-06 PY - 2012 AN - OPUS4-27302 LA - deu AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER - TY - CONF A1 - Hülagü, Deniz A1 - Tobias, Charlie A1 - Gojani, Ardian B. A1 - Rurack, Knut A1 - Hodoroaba, Vasile-Dan A1 - Hülagü, Deniz T1 - Towards automated scanning electron microscopy image analysis of core-shell microparticles for quasi-3D determination of the surface roughness N2 - Core-shell (CS) particles have been increasingly used for a wide range of applications due to their unique properties by merging individual characteristics of the core and the shell materials. The functionality of the designed particles is strongly influenced by their surface roughness. Quantitative evaluation of the roughness of CS microparticles is, however, a challenging task for Scanning Electron Microscopy (SEM). The SEM images contain two-dimensional (2D) information providing contour roughness data only from the projection of the particle in the horizontal plane. This study presents a practical procedure to achieve more information by tilting the sample holder, hence allowing images of different areas of a single particle to be recorded at different orientations under the same view angle. From the analysis of these images, quasi three-dimensional (3D) information is obtained. Three types of home-made particles were investigated: i) bare polystyrene (PS) particles, ii) PS particles decorated with a first magnetic iron oxide (Fe3O4) nanoparticle shell forming CS microbeads, iii) PS/Fe3O4 particles closed with a second silica (SiO2) shell forming core-shell-shell (CSS) microbeads. A series images of a single particle were taken with stepwise tilted sample holder up to 10° by an SEM with high-resolution and surface sensitive SE-InLens® mode. A reliable analysis tool has been developed by a script in Python to analyze SEM images automatically and to evaluate profile roughness quantitatively, for individual core-shell microparticles. Image analysis consists of segmentation of the images, identifying contour and the centre of the particle, and extracting the root mean squared roughness value (RMS-RQ) of the contour profile from the particle projection within a few seconds. The variation in roughness from batch-to-batch was determined with the purpose to set the method as a routine quality check procedure. Flow cytometry measurements provided complementary data. Measurement uncertainties associated to various particle orientations were also estimated. T2 - ICASS 5th International Conference on Applied Surface Science CY - Palma, Mallorca, Spain DA - 25.04.2022 KW - Core-shell particles KW - Image analysis KW - Roughness KW - Scanning electron microscopy PY - 2022 AN - OPUS4-54774 LA - eng AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER -