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Rapid continuous microwave-assisted synthesis of silver nanoparticles to achieve very high productivity and full yield: from mechanistic study to optimal fabrication strategy.

Dzido G, Markowski P, Małachowska-Jutsz A, Prusik K, Jarzębski AB - J Nanopart Res (2015)

Bottom Line: Systematic studies of silver nanoparticle synthesis in a continuous-flow single-mode microwave reactor using polyol process were performed, revealing that the synthesis is exceptionally effective to give very small metal particles at full reaction yield and very high productivity.Owing to its much higher reactivity, silver acetate was shown to be far superior substrate for the synthesis of small (10-20 nm) spherical silver nanoparticles within a few seconds.The performed studies indicate an optimal strategy for the high-yield fabrication of metal particles using polyol method.

View Article: PubMed Central - PubMed

Affiliation: Department of Chemical Engineering and Process Design, Faculty of Chemistry, Silesian University of Technology, Ks. M. Strzody 7, 44-100 Gliwice, Poland.

ABSTRACT

Systematic studies of silver nanoparticle synthesis in a continuous-flow single-mode microwave reactor using polyol process were performed, revealing that the synthesis is exceptionally effective to give very small metal particles at full reaction yield and very high productivity. Inlet concentration of silver nitrate or silver acetate, applied as metal precursors, varied between 10 and 50 mM, and flow rates ranged from 0.635 to 2.5 dm(3)/h, to give 3-24 s reaction time. Owing to its much higher reactivity, silver acetate was shown to be far superior substrate for the synthesis of small (10-20 nm) spherical silver nanoparticles within a few seconds. Its restricted solubility in ethylene glycol, applied as the solvent and reducing agent, appeared to be vital for effective separation of the stage of particle growth from its nucleation to enable rapid synthesis of small particles in a highly loaded system. This was not possible to obtain using silver nitrate. All the observations could perfectly be explained by a classical LaMer-Dinegar model of NPs' formation, but taking into account also nonisothermal character of the continuous-flow process and acetate dissolution in the reaction system. The performed studies indicate an optimal strategy for the high-yield fabrication of metal particles using polyol method.

No MeSH data available.


Related in: MedlinePlus

Bactericidal activity against gram-positive Bacillus subtilis and gram-negative Escherichia coli of selected silver nanoparticle suspensions: as obtained from fabrication (100 %) and after fourfold dilution (25 %)
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Fig10: Bactericidal activity against gram-positive Bacillus subtilis and gram-negative Escherichia coli of selected silver nanoparticle suspensions: as obtained from fabrication (100 %) and after fourfold dilution (25 %)

Mentions: Investigations of antibacterial activities of four nanoparticle suspensions (T22–T25) obtained directly from the process (20-mM Ag-acetate series) and also of their fourfold dilution solutions proved that they all exhibit bactericidal activity, somewhat stronger toward gram-positive than gram-negative bacteria. However, more important perhaps is that bactericidal activity proved stronger for T23- and T24-derived suspensions, i.e., those with large content of unreduced ions (Ag0 yield of 53 and 66 %). This could be inferred from larger sizes of inhibition zones of the respected samples and also their diluted solutions (Fig. 10).Fig. 10


Rapid continuous microwave-assisted synthesis of silver nanoparticles to achieve very high productivity and full yield: from mechanistic study to optimal fabrication strategy.

Dzido G, Markowski P, Małachowska-Jutsz A, Prusik K, Jarzębski AB - J Nanopart Res (2015)

Bactericidal activity against gram-positive Bacillus subtilis and gram-negative Escherichia coli of selected silver nanoparticle suspensions: as obtained from fabrication (100 %) and after fourfold dilution (25 %)
© Copyright Policy - OpenAccess
Related In: Results  -  Collection

Show All Figures
getmorefigures.php?uid=PMC4300398&req=5

Fig10: Bactericidal activity against gram-positive Bacillus subtilis and gram-negative Escherichia coli of selected silver nanoparticle suspensions: as obtained from fabrication (100 %) and after fourfold dilution (25 %)
Mentions: Investigations of antibacterial activities of four nanoparticle suspensions (T22–T25) obtained directly from the process (20-mM Ag-acetate series) and also of their fourfold dilution solutions proved that they all exhibit bactericidal activity, somewhat stronger toward gram-positive than gram-negative bacteria. However, more important perhaps is that bactericidal activity proved stronger for T23- and T24-derived suspensions, i.e., those with large content of unreduced ions (Ag0 yield of 53 and 66 %). This could be inferred from larger sizes of inhibition zones of the respected samples and also their diluted solutions (Fig. 10).Fig. 10

Bottom Line: Systematic studies of silver nanoparticle synthesis in a continuous-flow single-mode microwave reactor using polyol process were performed, revealing that the synthesis is exceptionally effective to give very small metal particles at full reaction yield and very high productivity.Owing to its much higher reactivity, silver acetate was shown to be far superior substrate for the synthesis of small (10-20 nm) spherical silver nanoparticles within a few seconds.The performed studies indicate an optimal strategy for the high-yield fabrication of metal particles using polyol method.

View Article: PubMed Central - PubMed

Affiliation: Department of Chemical Engineering and Process Design, Faculty of Chemistry, Silesian University of Technology, Ks. M. Strzody 7, 44-100 Gliwice, Poland.

ABSTRACT

Systematic studies of silver nanoparticle synthesis in a continuous-flow single-mode microwave reactor using polyol process were performed, revealing that the synthesis is exceptionally effective to give very small metal particles at full reaction yield and very high productivity. Inlet concentration of silver nitrate or silver acetate, applied as metal precursors, varied between 10 and 50 mM, and flow rates ranged from 0.635 to 2.5 dm(3)/h, to give 3-24 s reaction time. Owing to its much higher reactivity, silver acetate was shown to be far superior substrate for the synthesis of small (10-20 nm) spherical silver nanoparticles within a few seconds. Its restricted solubility in ethylene glycol, applied as the solvent and reducing agent, appeared to be vital for effective separation of the stage of particle growth from its nucleation to enable rapid synthesis of small particles in a highly loaded system. This was not possible to obtain using silver nitrate. All the observations could perfectly be explained by a classical LaMer-Dinegar model of NPs' formation, but taking into account also nonisothermal character of the continuous-flow process and acetate dissolution in the reaction system. The performed studies indicate an optimal strategy for the high-yield fabrication of metal particles using polyol method.

No MeSH data available.


Related in: MedlinePlus