Cryochemical synthesis of silver organosols in methyl acrylate

Cryochemical synthesis and properties of silver nanoparticle dispersions stabilised by poly(2-dimethylaminoethyl methacrylate)

“…The procedures used for the cryochemical synthesis of Ag-DMAEMA organic dispersions and for the evaluation of the DMAEMA conversion into poly-DMAEMA were analogous to those described earlier. 2 We found that the conversion was 1.7-1.9% and remained unchanged as the Ag:DMAEMA molar ratio increased from 1:4000 to 1:1000. The mechanism of DMAEMA polymerization in the test system is of particular interest and does not enter into the scope of this work.…”

“…1 Previously, stable silver organosols in the presence of methyl acrylate and poly(methyl acrylate) films containing metal particles of sizes not exceeding 15 nm were prepared. 2 In this study, we decided on poly(2-dimethylaminoethyl methacrylate) (poly-DMAEMA) as a polymer stabiliser for silver nanoparticles. In contrast to poly(methyl acrylate), poly-DMAEMA is soluble in solvents different in polarity.…”

Cryochemical synthesis of bimetallic nanoparticles in the silver–lead–methyl acrylate system

“…5 The silver plasmon absorption band in the Ag/MA organosol has a maximum at 416-420 nm. 3 In the spectrum of the freshly prepared Ag/Pb/MA organosol recorded immediately after it was transferred (in argon atmosphere) from the reactor chamber into a cylindrical ampoule (internal diameter d = 5 mm) and sealed (Figure 2, curve 2) this band is red-shifted (l max = 438 nm). When the ampoule was unsealed and the sample exposed to air and placed in a spectrophotometric cell (l = 1 mm) l max sharply increased to 453 nm (Figure 2, curve 3).…”

“…2 The latter technique was also used in this work. The choice of the silver-lead-methyl acrylate system is based on the results of our previous studies 3 and on a quantum-chemical estimation of the properties of bimetallic nanoparticles. The binding energies of mixed metal clusters (M 1 ) m (M 2 ) n (m + n £ 4) have been calculated.…”

“…they are smaller than the diameter of the silver nanoparticles (7-15 nm) obtained previously under similar conditions. 3 Figure 2 (curve 1) shows an absorption spectrum of cryochemically synthesised Pb/MA organosol. The spectrum shape is determined by the fact that the maximum of the lead plasmon absorption band is located at ca.…”