Structural Surface Features of Paramagnetic Multifunctional Nanohybrids Based on Silver Oleic Acid

Autor: Tamaz Agladze, Nino Makhaldiani, Marine Donadze, Spartak S. Khutsishvili, Maia Gabrichidze, Polina Toidze
Rok vydání: 2020
Předmět:
Zdroj: Journal of Cluster Science. 32:1351-1359
ISSN: 1572-8862
1040-7278
DOI: 10.1007/s10876-020-01904-6
Popis: 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 τ0 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)
Databáze: OpenAIRE
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