Structural Surface Features of Paramagnetic Multifunctional Nanohybrids Based on Silver Oleic Acid
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ORIGINAL PAPER
Structural Surface Features of Paramagnetic Multifunctional Nanohybrids Based on Silver Oleic Acid Spartak S. Khutsishvili1 Tamaz Agladze2
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Polina Toidze2 • Marine Donadze2 • Maia Gabrichidze2 • Nino Makhaldiani2
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Received: 2 March 2020 / Accepted: 28 September 2020 Ó Springer Science+Business Media, LLC, part of Springer Nature 2020
Abstract Sols of core–shell silver nanoparticles (AgNPs) are synthesized by electrochemical method. The method provides the ability to adjust the particle size by changing both the concentration of oleic acid and the residence time s0 in the organic phase. We synthesized AgNPs with oleic acid (OA) concentration of 0.25% (AgNPs & 0.25% OA) and 0.75% (AgNPs & 0.75% OA). These nanoparticles have been studied using modern physical–chemical methods. Differential thermal analysis curves indicate the chemical nature of bond ligand in the secondary shell; this conclusion is confirmed by quantum chemical simulation and semi-empirical calculation. In the electron paramagnetic resonance spectra of silver-containing sols AgNPs & 0.25% OA and AgNPs & 0.75% OA complex wide asymmetric signals of 500–800 G and g-factor of 2.09–2.13 are recorded, in addition, in the spectra of AgNPs with bilayer the pronounced ferromagnetic contribution is observed. The change of the oleic acid layers of the particles affects the dimension of the nanocrystallites that are being formed and the manifestation of their magnetism. Trial registration number and date of registration JCS-P-20-03-0188.R1, 22-Sep-2020 (02-Mar-2020) Graphic Abstract
Electronic supplementary material The online version of this article (https://doi.org/10.1007/s10876-020-01904-6) contains supplementary material, which is available to authorized users. & Spartak S. Khutsishvili [email protected] 1
Irkutsk Institute of Chemistry of the Siberian Branch of the Russian Academy of Sciences, 1 Favorsky St., Irkutsk 664033, Russia
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Research Institute of Green and Sustainable Chemistry, Georgian Technical University, 17 Guramishvili Ave, 0175 Tbilisi, Georgia
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S. S. Khutsishvili et al.
Keywords Silver nanoparticles Oleic acid Surface inhomogeneity EPR Metal–ligand bonding
Introduction Nanoparticles find wide application in medicine, design of smart materials, catalysis and electronics [1–5]. Silver nanoparticles are among the most important and interesting nanomaterials, which are promising for environment (water and air purification, catalysis) [6–8], biomedicine (treatment of socially significant diseases, diagnosis and therapy of cancer) [9, 10], food industry (packaging materials) [11, 12], in medical applications (such as antibacterial coatings and drug carriers) [13–16]. In addition, recently it has been reported that AgNPs can also be employed in engineering (optics, conducting materials, electronics, sensors, etc.) [17–21]. Due to their nano-size, metallic silver particles have unique physicochemical and biological properties that are associated with an
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