A5021520385- Nanoparticles: synthesis and applications
- Anodic Oxide Films and Nanostructures
- Chemistry and Chemical Engineering
- Microplastics and Plastic Pollution
- Smart Materials for Construction
- Recycling and Waste Management Techniques
- Atmospheric chemistry and aerosols
- Concrete Corrosion and Durability
- Atmospheric aerosols and clouds
- Effects and risks of endocrine disrupting chemicals
- Graphene and Nanomaterials Applications
- Fire effects on ecosystems
- Chemical Safety and Risk Management
- Surface Modification and Superhydrophobicity
- Plant responses to elevated CO2
- SARS-CoV-2 detection and testing
- Advanced Sensor and Energy Harvesting Materials
- Inhalation and Respiratory Drug Delivery
- Health, Environment, Cognitive Aging
- Atmospheric Ozone and Climate
- Photonic Crystals and Applications
- Nanoporous metals and alloys
- Environmental Toxicology and Ecotoxicology
- Corrosion Behavior and Inhibition
- Air Quality and Health Impacts
German Environment Agency
2014-2023
Environment Agency
2015
Max Planck Society
2002-2008
Max Planck Institute of Microstructure Physics
2008
Leibniz Institute for Neurobiology
2005
Leibniz Institute for Tropospheric Research
2005
Transmission electron microscopy analysis of self-ordered porous alumina obtained by electrochemical anodization shows that self-ordering requires a porosity 10%, independent the specific conditions. This corresponds to volume expansion aluminum about 1.2. We propose with any interpore distance is possible if applied potential, which mainly determines distance, and pH value electrolyte, defines pore radius, match 10% rule.
The self-ordering of nanoporous anodic aluminum oxide (AAO) in the course hard anodization (HA) sulfuric acid (H2SO4) solutions at voltages ranging from 27 to 80 V was investigated. Direct H2SO4-HA yielded AAOs with hexagonal pore arrays having interpore distances Dint 72 145 nm. However, were mechanically unstable and cracks formed along cell boundaries. Therefore, we modified procedure previously employed for oxalic HA (H2C2O4-HA) suppress development fabricate robust AAO films values 78...
For nanomaterials, not only their chemical composition but also morphological properties and surface determine characteristics. These do differ in comparison to the corresponding bulk material between different nanoforms of same substance. Changes these physico-chemical characteristics can cause changes properties, reactivity, (photo-) catalytic activities energetic turn alter (eco-) toxicity, fate behaviour environmental media toxico-kinetics. Registration, Evaluation, Authorisation...
We present a methodology for the analysis of grain morphology self-ordered hexagonal lattices and quantitative comparison quality their ordering based on distances between nearest neighbors angular order. Two approaches to identification evaluation are introduced: (i) color coding relative orientation hexagons containing central entity its six neighbors, (ii) incorporating triangles comprising three into grains or repelling them from deviations side lengths internal angles those an ideal...
ABSTRACT Within the European regulation on Registration, Evaluation, Authorisation and Restriction of Chemicals (REACH, EC No 1907/2006) specific provisions for nanomaterials were included, which have become effective 1 January 2020. Although knowledge peculiarities testing assessing fate effects in environment strongly increased last years, uncertainties about how to perform a reliable robust environmental risk assessment still remain. These are special relevance regulatory context,...
The elucidation of bioavailability, uptake and elimination as well accumulation the test items was possible on level total particle concentrations for whole soft body single tissue compartments.
Engineered nanomaterials (ENMs) are marketed as a substance or mixtures and additionally used due to their active agent properties in products such pesticides biocides, for which specific regulations apply. Currently, there no testing strategies environmental fate effects of ENMs within the different regulations. An test risk assessment strategy have been developed considering general principles chemical assessment.The has based on knowledge national international discussions. It also takes...
Abstract The fabrication of one‐dimensional (1D) nanostructures and microstructures inside the pores porous templates is intensively investigated. release these structures commonly accomplished by etching destroying templates. 1D tend to condense because occurrence capillary forces during drying specimens. It shown that highly ordered arrays polymer microfibers can be easily detached from silanized mechanical lift‐off. This procedure leaves intact, thus allowing their recycling, does not...
Given the numerous manufactured nanomaterials already on market and expected in future, effort for individual investigation of hazard risk would be enormous. To overcome this challenge, grouping has been identified as one critical issue by European Commission well Organisation Economic Co-operation Development (OECD). In that context, several research projects have carried out to deliver scientific input develop approaches. This publication discusses experiences from cases two with aims...