Novel modification of elemental silver formed in Ag4[Fe(CN)6]-gelatin-immobilized matrix Implants

Abstract

Ag 4 [Fe(CN) 6 ]→Ag reduction process occurring in Ag4[Fe(CN) 6 ]-gelatin-immobilized matrices, has been studied. In the course of reduction, these matrices are in a contact with water-alkaline solu-tion containing tin(II) dichloride along with an organic or inorganic compound capable of forming a stable soluble complex with Ag(I). It has been found that the substance formed in the gelatin matrix, is almost pure elemental silver, which consists two various phases which are distinguished by their optical and X-ray diffraction parameters. © Versita Sp. z o.o.

Application of a conversion electrode based on decomposition derivatives of Ag4[Fe(CN)6] for aqueous electrolyte batteries

“…Usually, Ag 4 [Fe(CN) 6 ] is prepared by precipitation, has a white colour, and is used in a wet state for sensing reaction, catalysis, and silver reduction. [16][17][18] However, aer moderate drying, the sample turned a darkish-blue, suggesting a change in its structure or even its composition. The structural composition of the obtained material was assessed by XRD analysis (Fig.…”

Gelatin as It Is: History and Modernity

“…The processes associated with the immobilization of chemical compounds in a gelatin matrix have been considered in a very significant number of original articles, among which we should first of all mention [ 125 , 126 , 127 , 128 , 129 , 130 , 131 , 132 , 133 , 134 , 135 , 136 , 137 , 138 , 139 , 140 , 141 , 142 , 143 , 144 , 145 , 146 , 147 , 148 , 149 , 150 , 151 , 152 , 153 , 154 , 155 , 156 , 157 , 158 , 159 , 160 , 161 , 162 , 163 , 164 , 165 , 166 , 167 , 168 , 169 , 170 , 171 , 172 , 173 , 174 , 175 , 176 , 177 , 178 , 179 ]. Very likely, the largest number of works in this direction was associated with the im...…”

“…A fairly significant number of works are devoted to gelatin-immobilized proteases (see, in particular, [ 167 , 168 , 169 , 170 , 171 , 172 , 173 , 174 ]); there is a review article on this subject [ 175 ]. The process of obtaining gelatin-immobilized elemental silver was previously described by our group [ 176 , 177 , 178 ].…”

Gelatin Matrix as Functional Biomaterial for Immobilization of Nanoparticles of Metal-Containing Compounds

“…It was possible to obtain elemental silver nanoparticles only as a result of some processes so-called “reprecipitation” of elemental silver, in which the previously obtained gelatin-immobilized elemental silver was subjected to a two-stage process, during the first stage of which, under the influence of some oxidizing agent, it was converted into a sparingly soluble compound of this element (as a rule, into silver bromide AgBr), and at the second stage, was subjected to reduction to elemental silver using a strong reducing agent, tin dichloride, SnCl 2 . The details of elemental silver “re-precipitation” using such a process are described in [ 84 , 85 , 86 , 87 , 88 ]. Similar processes were also considered in [ 89 , 90 , 91 , 92 , 93 , 94 , 95 ] using other chemical compounds as reducing agents.…”

“…Similar processes were also considered in [ 89 , 90 , 91 , 92 , 93 , 94 , 95 ] using other chemical compounds as reducing agents. In this regard, it should be noted that the processes described in [ 84 , 85 , 86 , 87 , 88 ], according to the data of XRD analysis [ 86 , 87 ], gave rise to a specific phase of elemental silver, which imparted a red-brown color to the gelatin layer. Although a priori, taking into account everything said in Section 3 , one can expect that elemental silver nanoparticles should be formed as a result of the “re-precipitation” process; experimental evidence for this was obtained only a few years ago using SEM [ 87 ] (see Figure 5 ).…”