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Electrical semiconductor characterization
Luminescence dating, research, dosimetry and more
Free radical measurements in life science and biomedical applications
Our benchtop MiniScope (MS 5000) ESR spectrometer is a research grade device with sensitivity and reliability for demanding...
Industry standard for evaluating irradiation doses on alanine tablets
Nitric oxide measurement, reactive oxygen species, oxidative stress, radical generating systems, photo dynamic therapy
Antioxidative features of foodstuff, radicals on foodstuff, radiation-induced radicals
Analysis of chemical structure of paramagnetic centers and their orientation within a crystal
Bioinorganic transition metal compounds, fenton chemistry, effect of heavy metal ions on livving tissue
Variety of free radicals in environmental applications can be evaluated by EPR spectroscopy
ESRStudio is a dynamic and user friendly software for ESR measurements with some of the most modern and fluent workflow based...
Magnettech GmbH was founded in 1991 by the members of the department of "Centre for Construction of Scientific Devices"...
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Ensuring flawless processing of unsaturated hydrocarbons
In hydrocrackers, educts like styren, ethylen or propylen are treated at high temperature to form saturated carbons. To prohibit undesirable side reactions, inhibitors can be added to prevent the unsaturated carbons from forming a highly viscous sludge.
Polymerization is based on a mechanism of radical chain reaction. Stable radicals such as TEMPOL can stop the chain. The right proportion can be determined easily and fast by ESR spectroscopy (see diagram to the right). Too low concentrations cannot stop polymerization. Too high concentrations on the other hand support the polymerization process.
As a consequence, the monitoring of the content of free radicals which may have been added as in-process inhibitors could be a valuable control instrument. The most common stable free radicals used for this purpose are nitroxyl compounds having a very characteristic ESR spectrum entailing three lines when dissolved in a liquid (see diagram). ESRStudio automatically records, saves and evaluates the measurement result. Predefined calibration curves for quantitative ESR make Polymerization control as simple as a microwave oven.
high throughput for solid samples
up to 26 samples
highest throughput for inline-testing
liquid samples only
Polymer research also benefits from ESR. The interaction of the spin probe 16-DSA with amphiphilic core-shell polymers is studied by CW-EPR.
spin probe shows dynamic hydrophobic attachment
enables insights into temperature response, aggregation and binding properties of the polymer
physical features of core region is strongly influenced by length of hydrophobic chains (so-called shell)
wide variety of polymer properties can be adjusted with chain length and degree of polymerization
ESR results were confirmed by dynamic light scattering (DLS), transmission electron microscopy (TEM) and molecular dynamic simulations (MD)
Dariush Hinderberger , Jörg Reichenwallner, Anja Thomas, Lutz Nuhn, Tobias Johann, Annette Meister, Holger Frey (2016) Polymer Chemistry 7, 5783-5798