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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...
The MS 6000 is a research device with high-end sensitivity for sophisticated applications in field of science & technology.
Industry standard for evaluating irradiation doses of alanine pellets and blisters
Nitric oxide measurement, reactive oxygen species, oxidative stress, Proteine structure & enzyme function
Antioxidative features of foodstuff, Food irradiation control, Flavour stability, Beer analysis
Analysis of chemical structure of paramagnetic centers and their orientation within a crystal
Transition metal compounds, Effects of heavy metal ions on living tissue, etc.
A variety of free radicals is formed through pollutants such as particulate matter, nanoparticles or others
Asphaltenes in crude oil, Thermooxidative breakdown of lubricants, Polymerization control
Quality control of pharmaceuticals and impurity profiling
Spin density, Kinetic measurements
ESRStudio is a dynamic and user friendly software for ESR measurements with some of the most modern and fluent workflow based...
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Under friction and heat free radicals are formed in lubricants which can be detected by ESR/EPR
When used in mechanics, oils degrade over time. Viscosity decreases and solid particles are dispersed. Both factors are worsening the lubrication effect. Starting from this point, a degradation cycle begins, which constantly accelerates (see schematic below).
During the decomposition process, radicals are formed that indicate thermooxidative breakdown. ESR spectroscopy is a simple and fast method to determine the amount of radicals and monitore the lubricant’s quality.
Shimonaev et al. 1966
testing lube additives:
sulfonates, alkylphenolates or dialkyldithiophosphates of Me2
Me = Ca, Ba, Zn
additives are going to dissociate into free radicals
Me-S and Me-O bonds are breaking easier than C-C bond
most additives form solutions of free radicals
only two additives show no radicals
one additive forms radicals upon heating (160 °C)
G. S. Shimonaev, G. V. Zakharov (1966) Chemistry and Technology of Fuels and Oils 2, 510-513