Silver diamine, solution preparation

Silver diamine solution 0.047 M silver nitrate, 0.2 M ammonium hydroxide, 0.02 M sodium hydroxide. This diamine solution is made by combining a silver nitrate solution with an ammonium/sodium hydroxide solution. To make the silver nitrate solution, add 6 g of silver nitrate to 30 ml of deionized water in a small graduated cylinder or beaker. To make the ammonium/sodium hydroxide solution, add 10 ml of concentrated NH4OH and 1.5 ml of 10 M NaOH to 160 ml of deionized water in a 1-liter graduated cylinder. After preparation of each of the above solutions, slowly add the silver... 

Copper-coated poly-p-phenylene terephthalamide fibers and films were prepared by the following procedure. The fibers and films were immersed in a solution of 0.1 a K+-CH2S (0)CH3 in DHSO for several seconds at room temperature and then into a solution of 0.1 U silver trifluoroacetate for several seconds at room temperature. The fibers and films were rinsed with water and dried by means of a vacuum. The fibers and films were then immersed for several seconds into a copper electroless plating bath consisting of 22.7 g of copper sulfate penta-hydrate, 12.5 g of sodium carbonate, 70.0 g of sodium potassium tartrate, and 9.0 g of ethylene diamine tetraacetic acid all in 400 mL of deionized water to which was added a Solution of 20.0 g of sodium hydroxide in 100 mL Of water and 65 mL of a 37% formaldehyde solution. The fibers and films were then rinsed with water and dried. 

Other metallic salts of 5-nitrotetrazole (e.g., silver) are prepared by treating aqueous solutions of NaNT, [Cu(en)2](NT)2, or [Cu(pn)2](NT)2 with the soluble version of the relevant metallic salt [4,41,42,46,47,53,54,59,65,67]. In the case of [Cu(en)2](NT)2 or [Cu(pn)2](NT)2 diamine must first be broken down and destroyed or made inactive to prevent complex formation with the metal. This is easily achieved by reaction with nitric acid (to tie up the diamine) followed by addition of the mercuric nitrate solution (mercuric salt forms) [4, 42, 46, 56, 66]. The several methods of Hg(NT)2 analysis are summarized in [67]. 

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