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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
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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