CHIMIA
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Exploring Sensitized Photon Upconversion – From Past to Present
Get PDFThe conversion of low energy photons into high energy photons via triplet-triplet annihilation (TTA) photon upconversion (UC) has become a promising avenue for furthering a wide range of optoelectronic applications. Through the decades of research, many combinations of triplet sensitizer species and annihilator molecules have been investigated unlocking the entire visible spectrum upon proper pairings of sensitizer and annihilator identities. Here, we reflect upon the seminal works which lay the foundation for TTA-UC originating from solution-based methods and highlight the recent advances made within the solid state primarily focusing on perovskite-based triplet generation
Enabling a Smooth Transition: Responsible Chemistry Competencies for the European Green Deal
Get PDFChemists are a vital part of the research and innovation (R&I) landscape. With their expertise, they shape progress and, thus, society. In order to live up to this responsibility, it is suggested to prepare young chemists for their future role as innovators with proper training. Here, it is important to go beyond the good scientific practice dimension of research integrity and add discourse performance and value assessments to the class outline of a “responsible chemistry” course. This becomes especially relevant in view of changing demands on chemical research and innovation as envisioned by the European Green Deal through its Horizon Europe funding scheme. This paper outlines the necessity of preparing chemists for the requirements of a green transition R&I policy and shows what that would mean for “ethics in chemistry” education
Preparing for the Transition to Professional Life:: The First Experiences with the New Mentoring Program of the SCS
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Up-scaling a Sol-Gel Process for the Production of a Multi-Component Xerogel Powder
Get PDFA sol-gel process for the synthesis of a multi-component oxide material from the system SiO2-ZrO2-Al2O3underwent optimization and up-scaling. Initially, on a laboratory scale, components including precursors, catalysts, and additives were methodically evaluated to ensure a safe and efficient transition to larger volumes. Subsequently, the equipment for the whole setup of the sol-gel process was strategically selected. Leveraging insights from these optimizations, the process was successfully scaled-up to pilot-scale operation, conducting hydrolysis, condensation reactions, gelation, aging, and drying within a single, integrated conical dryer system for an 80 L batch. A visual test and FTIR spectroscopy were applied for process control and monitoring
Antibiotics Uptake from Soil and Translocation in the Plants – Meta-analysis
Get PDFAntibiotics reach agricultural soils via fertilization with manure and biosolids as well as irrigation withwastewater and have the potential to be taken up by growing crops. The fate of antibiotics in terms of uptakefrom soil to plants, as well as translocation from root to leaves, is determined by a combination of antibiotic’sphysio-chemical (e.g. speciation, lipophilicity), soil (e.g. organic carbon content, pH) and plant (e.g.transpiration rates) characteristics. In this meta-analysis, a literature search was executed to obtain an overview of antibiotic uptake to plants, with an aim to identify uptake and translocation patterns of different antibiotic classes. Overall, we found that higher uptake of tetracyclines to plant leaves was observed compared to sulfonamides. Differences were also observed in translocation within the plants, where tetracyclines were found in roots and leaves with close to equal concentrations, while the sulfonamides represented a tendency to accumulate to the root fraction. The antibiotic’s characteristics have a high influence on their fate, for example, the high water-solubility and uncharged speciation in typical agricultural soil pH ranges likely induces tetracycline uptake from soil and translocation in plant. Despite the advances in knowledge over the past decade, our meta-analysis indicated that the available research is focused on a limited number of analytes and antibiotic classes. Furthermore, fastgrowing plant species (e.g. spinach, lettuce, and radish) are overly represented in studies compared to crop species with higher significance for human food sources (e.g. corn, wheat, and potato), requiring more attention in future research
An Innovative Approach for Analyzing Phytotoxins as Micropollutants in the Environment: Highlights of Analytical Sciences in Switzerland
No full textThiol-Mediated Uptake (TMU, TIMEUP)
Get PDFThis account briefly summarizes objectives and progress made so far with the Swiss-ERC AdG entitled Translational Dynamic Covalent Exchange Cascades (TIMEUP)
Molecular Mechanisms of Aerosol Nucleation: from CLOUD Chamber Experiments to Field Observations
Get PDFAtmospheric aerosol particles contribute to over four million premature deaths annually and play a critical role in modulating Earth’s climate. Most atmospheric particles and more than 50% of the cloud condensation nuclei are formed through a secondary process named new particle formation involving unique precursor vapors. This article summarizes current knowledge of how new atmospheric particles form, based on experiments at the CERN CLOUD chamber. While the role of sulfuric acid has long been known, other vapors like highly oxygenated organic molecules and iodine oxoacids are also important, along with stabilizers like ammonia, amines, and ions from cosmic rays. We explain how findings from CLOUD experiments help us understand particle formation in various atmospheric conditions and improve air quality and climate models