Mechanism of formation of silver nanoparticles in MAG–DMAEMA copolymer aqueous solutions

Abstract

Dispersed Ag nanoparticles were prepared in aqueous solutions in the presence of pure poly[2-(dimethylamino)ethyl methacrylate] (poly-DMAEMA), poly[2-deoxy-2-methacrylamido-D-glucose] (poly-MA G), and their copolymers of poly[MAG-DMAEMA] with different mole fractions. Polymers contributed to the silver reduction, formation of nanoparticles, and stabilization of suspensions. No agglomerations of nanoparticles are formed. For each sample, more than one thousand silver particles were measured by transmission and scanning transmission electron microscopy to determine their number vs diameter and volume versus diameter distributions. The samples with the

Sizes and size distributions of nanoparticles: Causes of differences in results obtained by transmission electron microscopy and small angle X-ray scattering

“…The largest difference close to 60 % is observed for the particles in pure DMAEMA homopolymer. We reported earlier [9] that the particles in this sample had the smallest diameters with the mode diameter between 2 and 4 nm, which is the principal limit for SAXS measurements. The difference in mode diameter for two copolymers does not exceed 29 %.…”

“…% 2-deoxy-2-methacrylamido-D-glucose (MAG)/2-(dimethylamino) ethyl methacrylate (DMAEMA) copolymers or pure DMAEMA and MAG homopolymers at room temperature and pressure. All synthetic details are given elsewhere [8,9]. Selenium particles were obtained by reduction of selenious acid using ascorbic acid and stabilized by poly(2-acrylamido-2-methylpropane sulfonic acid) (PAMPS) or by polyvynilpyrrolidon (PVP) in aqueous solutions.…”

Combination of thresholding and fitting methods for measuring nanoparticle sizes and size distributions in (S)TEM

“…To test our program, sizes and size distributions of Ag nanoparticles were measured on TEM, BF, and HAADF STEM images were performed and compared with results obtained by manual measurements and/or using ImageJ and Pebbles algorithms. Details of synthesis and TEM characterization of Ag nanoparticles can be found elsewhere (Shvedchenko, Nekrasova, Nazarova, Buffat, & Suvorova, ). Briefly, Ag nanoparticles were obtained during redox reactions in water solutions between silver nitrate and polymers: homopolymers 2‐(dimethylamino)ethyl methacrylate (DMAEMA) and 2‐deoxy‐2‐methacrylamido‐ d ‐glucose (MAG) and the corresponding copolymers with different molar ratio of the components.…”

“…However, the time spent on TEM to get the large number of images for relevant statistical analysis is prohibitive because of the need to find polymer grains with suitable thin edges. The data obtained from such samples were also considered in size analysis and evaluation of the particle formation mechanism (Shvedchenko et al, ).…”

Antimicrobial Activity of Hybrid Nanomaterials Based on Star and Linear Polymers of N,N′-Dimethylaminoethyl Methacrylate with In Situ Produced Silver Nanoparticles

“…“Green” synthesis of AgNPs using the N , N ′-dimethylaminoethyl methacrylate homopolymer has been described in very few papers [ 4 , 16 , 17 , 18 ]. Shvedchenko et al [ 16 ] reported the formation of AgNPs using linear PDMAEMA, poly[2-deoxy-2-methacrylamido-D-glucose], and their copolymers. The authors proposed a mechanism of AgNPs formation based on the ratio of the particle diameter to the average number of reducing sites per monomer, depending on the composition of the polymer.…”