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SCCS/1596/18 Final Opinion on Colloidal Silver (nano) __________________________________________________________________________________________ Firstly, there are two different numbers mentioned for the same dispersion A in the diffraction pattern for the lattice constant a (a = 0.401 ± 0.08 nm in Ref. 2 and 40 and a = 0.408 ± 0.002 nm in Ref. 44, respectively). This may mean that the arrangement of atoms within the lattice is different. Secondly, Figure 3 and 4 in this Opinion are of poor quality and difficult to interpret. They seem to be not representative of the size distribution as mainly larger structures are shown. More in detail, the selected area diffraction pattern from Figure 3a (Figure 1a in Ref. 44) is not a selected area diffraction (SAD) pattern corresponding to a crystalline phase but rather to an amorphous one. There is no additional information on this aspect. Furthermore, the SAD pattern from Figure 3b (Figure 1b in Ref. 44) corresponds to a nanostructure phase (not a micrometric one). Continuous rings, as presented, are not representative for micrometric entities. Also, it is mentioned in Ref. 44 that a microscopic image is prepared using dark field mode from electrons forming the first diffraction ring (ring number 1 in Fig. 3a of this Opinion, Fig 1a in Ref. 44), but the SCCS is of the opinion that the image is not a dark field one. In a dark field image, the background is black and the diffracted area is bright. In the image mentioned there is an area with no materials, and this should be black. Therefore, the SCCS concludes that this is not a dark field image but a bright field one. In spite of the fact that some detailed additional information for colloidal silver dispersion A has been provided, the information is still not sufficient for a proper characterisation of all the colloidal silver dispersions. 3.1.10. Crystal structure SCCS Comment Although some of the Applicants have stated that the crystalline form of the material is spherical-crystalline, no supporting evidence has been provided. It is unclear to the SCCS how the Applicants arrived at the stated conclusions. Furthermore, the images provided in the additional information for colloidal silver dispersion A (Ref. 44) indicate, apart from being crystalline, also an amorphous form (see Figure 3b of this Opinion). However, no detailed information is provided on this aspect. 3.1.11. UV absorption Additional data on UV and visible absorption have been submitted for colloidal silver dispersion I. The UV/Vis absorption spectrum of dispersion I is depicted in Figure 3. This Figure shows that the UV/Vis spectrum of colloidal silver Ag 100 did not show any significant absorption peaks over 250 nm. Ref.: 54 SCCS comment: Although the UV/Vis absorption spectrum now has been provided for one of the colloidal silver dispersions, data have not been submitted for any of the other materials and should be provided. 16PDF Image | Consumer Safety SCCS OPINION ON Colloidal Silver (nano)
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