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125 In the SEM image only minor agglomeration of nanoparticles can be observed. The small percentages of big or agglomerated particles is quantitatively shown in Figure 6 by the histogram of the silver nanoparticles produced in run 1. It has to pointed out that in Table 1 it is reported the range of the average size of the SNP. Figure 5.Energy dispersive spectrum (EDS) of silver nanoparticles produced in run 4. 8 Figure 6. Histogram of distribution of silver nanoparticles in size. The EDS spectrum shows that the impurities present in the nanoparticles mainly consist of carbon and oxygen elements. The reason of such a presence should be an inclusion of glucose or starch in some agglomerates of nanoparticles. Other minor inorganic impurities as Al, Zn, Si elements may depend on some residues of nanoparticles previously produced over the SDR itself. In this work the performances of the green process in terms of size, yields and purity of the produced SNP have been studied by changing the ratio starch/silver nitrate and the reactor configuration (see runs 2 and 3). The decrease of the ratio starch/ silver nitrate affected negatively the yield. This could be justified by a lower rate of the oxidation reaction of the starch, expressed by eq. 4. On the contrary the mentioned ratio was beneficial for the nanoparticles purity, probably because of a smaller inclusion of organic products into the precipitated silver. A wider experimental work was devoted to the comparison of the performances attained in correspondence of different reactors configurations, characterized by a different grade of micromixing between the two reagent solutions. The runs 1,2 and 4 were performed at same operating conditions, but by usingPDF Image | Reactor Configuration on the Production of Silver Nanoparticles
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