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Electron Magnetic Resonance Study of the Most Sensitive Metal Paint Components for Degradation

Żyłka Wojciech Marek, Cieniek Bogumił, Skała Patrycja

Advances in Science and Technology. Research Journal

2023

Vol. 17, no 3

101--109

The article presents an electron magnetic resonance study of metal paints in terms of identification and selection of appropriate pigment components based on the summation of spectral components. Research was carried out to assess the durability of paints on the basis of the detection of free radicals in individual components, the occurrence of which leads to paint degradation. Two types of acrylic resins, three types of organic pigments, and titanium white, hardener, and clearcoat were tested. The g-factor as well as all electron magnetic resonance line parameters were calculated. Electron magnetic resonance is found to be useful in the effort to eliminate a paint component that reduces color durability and to select components in terms of paint quality.

Magnetic properties of ZnO:Co layers obtained by pulsed laser deposition method

Stefaniuk I., Cieniek B., Rogalska I., Virt I. S., Kościak A.

Materials Science Poland

2018

Vol. 36, No. 3

439--444

We have studied magnetic properties of zinc oxide (ZnO) composite doped with Co ions. The samples were obtained by pulsed laser deposition (PLD) method. Electron magnetic resonance (EMR) measurements were carried out and temperature dependence of EMR spectra was obtained. Analysis of temperature dependence of the integral intensity of EMR spectra was carried out using Curie-Weiss law. Reciprocal of susceptibility of an antiferromagnetic (AFM) material shows a discontinuity at the Néel temperature and extrapolation of the linear portion to negative Curie temperature. The results of temperature dependence of EMR spectra for the ZnO:Co sample and linear extrapolation to the Curie-Weiss law indicated the AFM interaction between Co ions characterized by the Néel temperatures TN = 50 K and TN = 160 K for various samples. The obtained g-factor is similar to g-factors of nanocrystals presented in literature, and the results confirm that in the core of these nanocrystals Co was incorporated as Co2+, occupying Zn2+ sites in wurtzite structure of ZnO.

Copper-manganese-zinc spinels in zeolites : study of EMR spectra

Decyk P., Więckowski A. B., Najder-Kozdrowska L., Bilkova I.

Nukleonika

2015

Vol. 60, No. 3, part 1

423--428

The aim of this study is the application of electron magnetic resonance (EMR) spectroscopy to determine the interactions between NaY and HY zeolites and Cu-Mn-Zn spinels loaded onto the zeolite surfaces. The materials were characterized using XRD and IR spectroscopies. Four types of EMR lines were observed for Cu-Mn-Zn/NaY, Cu-Mn-Zn/HY samples. The difference between the EMR spectra recorded at 77 and 293 K has been shown. The spectra recorded at 77 K allowed us to distinguish between the species formed on NaY and HY zeolites. The EMR spectrum of Cu-Mn-Zn/NaY recorded at 77 K showed only one line attributed to antiferromagnetic spinels Cu1.4Mn1.6O4 and ZnMn2O4 or/and Cu0.5Zn0.5Mn2O4. The spinels appeared to be more stable (more strongly attached) on HY zeolite than on NaY one. It was proved that different strength of interactions between the zeolites and Cu-Mn-Zn spinels was caused by differences in the acidity of NaY and HY zeolites.