A5002176910- Mesoporous Materials and Catalysis
- Gas Sensing Nanomaterials and Sensors
- Analytical Chemistry and Sensors
- Catalytic Processes in Materials Science
- Metal-Organic Frameworks: Synthesis and Applications
- Zeolite Catalysis and Synthesis
- Transition Metal Oxide Nanomaterials
- ZnO doping and properties
- Health and Medical Studies
- Layered Double Hydroxides Synthesis and Applications
- Supercapacitor Materials and Fabrication
- Aerogels and thermal insulation
- Advanced Chemical Sensor Technologies
- Advancements in Battery Materials
- Physical Activity and Health
- X-ray Diffraction in Crystallography
- Chemical Synthesis and Characterization
- Catalysis and Oxidation Reactions
- Extraction and Separation Processes
- Photonic Crystals and Applications
- Quantum Dots Synthesis And Properties
- Behavioral Health and Interventions
- Covalent Organic Framework Applications
- Polyoxometalates: Synthesis and Applications
- Model Reduction and Neural Networks
Paderborn University
2016-2025
Universität Hamburg
1998-2025
University Medical Center Hamburg-Eppendorf
2025
DVGW-Forschungsstelle am Engler-Bunte-Institut des Karlsruher Instituts für Technologie
2025
Karlsruhe Institute of Technology
2025
Robert Bosch (Germany)
2023
SRH Hochschule für Gesundheit Gera
2019-2022
Justus-Liebig-Universität Gießen
2001-2015
Krankenhaus Nordwest
2015
Red Hat (United States)
2005-2014
Semiconducting metal oxides are frequently used as gas-sensing materials. Apart from large surface-to-volume ratios, well-defined and uniform pore structures particularly desired for improved sensing performance. This article addresses the role of some key structural aspects in porous gas sensors, such grain size agglomeration, or crack-free film morphology. New synthesis concepts, example, utilisation rigid matrices structure replication, allow to control these parameters independently,...
Abstract The synthesis and characterization of ordered mesoporous In 2 O 3 materials by structure replication from hexagonal SBA‐15 silica cubic KIT‐6 is presented. Variation the parameters allows for different pore sizes wall thicknesses in products. samples turn out to be stable up temperatures between 450 °C 650 °C; such high thermal stability necessary their application as gas sensors. Test measurements show a sensitivity methane concentrations relevant explosion prevention. shown...
In recent years, a lot of research activity has focused on the synthesis new ordered porous materials by utilization matrices as templates. Since are themselves created templating procedures, entire process can be envisaged "repeated templating". This review describes conceptual developments in field structure replication and summarizes large number publications functional prepared this method.
Periodically ordered mesoporous magnesium oxides were synthesized by utilization of CMK-3 carbon as exotemplate. The products exhibit high thermal stability and basic properties, which makes them promising for application in heterogeneous catalysis.
Faradaic reactions including charge transfer are often accompanied with diffusion limitation inside the bulk. Conductive two-dimensional frameworks (2D MOFs) a fast ion transport can combine both-charge and their porous structure. To study remaining limitations caused by particle morphology, different synthesis routes of Cu-2,3,6,7,10,11-hexahydroxytriphenylene (Cu3 (HHTP)2 ), copper-based 2D MOF, used to obtain flake- rod-like MOF particles. Both morphologies systematically characterized...
The production of hydrogen and the utilization biomass for sustainable concepts energy conversion storage require gas sensors that discriminate between (H2) carbon monoxide (CO). Mesoporous copper–ceria (Cu–CeO2) materials with large specific surface areas uniform porosity are prepared by nanocasting, their textural properties characterized N2 physisorption, powder XRD, scanning electron microscopy, transmission energy-dispersive X-ray spectroscopy. oxidation states copper (Cu+, Cu2+) cerium...
Periodically ordered mesoporous magnesium oxide was synthesized in a double replication procedure. Mesoporous SBA-15 silica and CMK-3 carbon were successively used as hard structure matrixes. The pore system infiltrated with Mg(NO3)2, which then converted to MgO at 573 K; the matrix finally removed by thermal combustion. of corresponds that original silica. products consist hexagonally arranged cylindrical mesopores crystalline walls. efficiency series studied variation infiltration method...
Abstract A model is proposed for the drop in electronic resistance of n‐type semiconducting indium oxide (In 2 O 3 ) upon illumination with light (350 nm, 3.5 eV) as well (light‐enhanced) sensitivity In to oxidizing gases. Essential features are photoreduction and a rate‐limiting oxygen‐diffusion step. Ordered, mesoporous high specific surface area serves versatile system experimental studies. Analytical techniques comprise conductivity measurements under controlled atmosphere (synthetic...
Abstract CPO‐27 is a metal‐organic framework (MOF) with coordinatively unsaturated metal centers (open sites). It therefore an ideal host material for small guest molecules, including water. This opens up numerous possible applications, such as proton conduction, humidity sensing, water harvesting, or adsorption‐driven heat pumps. For all of these profound knowledge the adsorption and desorption in micropores mandatory. The hydration structure CPO‐27‐ M ( = Zn Cu) investigated using vapor...
Over the past few years a growing number of scientists have dedicated their attention to synthesis mesostructured aluminophosphates following concept supramolecular structure direction. Their research has produced large variety synthetic approaches and yielded materials with various structural properties. Today substantial publications accumulated; this short review provides general summary literature aim display opportunities for future work.
We report on the synthesis and CO gas-sensing properties of mesoporoustin(IV) oxides (SnO2). For cetyltrimethylammonium bromide (CTABr) wasused as a structure-directing agent; resulting SnO2 powders were applied films tocommercially available sensor substrates by drop coating. Nitrogen physisorption showsspecific surface areas up to 160 m2·g-1 mean pore diameters about 4 nm, verifiedby TEM. The film conductance was measured in dependence concentration inhumid synthetic air at constant...
The growth of ZnS nanoparticles during precipitation from aqueous solution is studied by in situ stopped-flow UV absorption spectroscopy at temperatures between 283 and 323 K. Particle marked substantial ripening the first 60 ms. Kinetic data suggest that a mechanism coalescence (oriented attachment) predominant over Ostwald ripening, although latter seems to coexist significant degree early temporal stages, predominantly low temperatures.
Capacitive sensors are the most commonly used devices for detection of humidity because they inexpensive and mechanism is very specific humidity. However, especially industrial processes, there a lack dielectrics that stable at high temperature (>200 °C) under harsh conditions. We present capacitive sensor based on mesoporous silica as dielectric in simple design pressed pellets. Investigation structural stability porous simulated operating conditions well influence pellet production will be...
Metal-organic frameworks (MOFs) are crystalline microporous materials with tunable chemical and physical properties. By combining various metal clusters different interconnecting organic linkers, the pore structure, crystallinity, as well surface properties can be modified. In present work, modification of linker molecules is utilized to synthesize CAU-10 type MOFs variable affinity water. principle, this should influence accessibility pores for water vapor therefore offer a tool control its...
Herein we present a new proton-conducting iron(II) metal–organic framework (MOF) of an unusual structure formed by chains alternating bistriazolate-p-benzoquinone anions and cations with four axially coordinated water molecules. These assemble via π–π stacking between the aromatic units to form three-dimensional grid-like network channel pores filled The material was structurally characterized single-crystal XRD analysis, its thermal stability investigated. proton conductivity studied...
Abstract In the spatial confinement of cylindrical mesopores with diameters a few nanometers, water molecules experience restrictions in hydrogen bonding. This leads to different behavior regarding molecular orientational freedom (‘structure water') compared bulk liquid state. addition pore size, is also strongly affected by strength wall‐to‐water interactions, that is, wall polarity. this work, studied both experimentally and theoretically. The surface polarity mesoporous silica (SiO 2 )...