Process for making silver nanostructures and copolymer useful in such process
a technology of silver nanostructures and copolymers, which is applied in the direction of sustainable manufacturing/processing, final product manufacturing, conductors, etc., can solve the problems of not being well suited to the next generation of display, lighting, or photovoltaic devices, and the processing required to obtain composite films that exhibit that level of performance is quite demanding
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example 3
[0178]The silver nanostructures of Examples 3A-3C were made substantially in accord with the process used to make the nanowires of Examples 2A-2G, as described above, using 0.5 g of the poly(VP-co-DADMAN) copolymer of Example 1E (16 wt % DADMAN content), except that the amount of silver nitrate added to the reaction mixture was varied. The length distribution of the as produced nanostructures was determined using the image analysis software “Image)” on picture taken with an optical microscope.
[0179]FIG. 3 shows the size distributions of the nanostructure products of Examples 3A-3C. The amount of AgNO3 used in each synthesis, as well as the symbol used to represent the nanostructure product in FIG. 3, is listed in TABLE III below.
TABLE IIIExample #Symbol In FIG. 3AgNO3 (wt %)AgNO3, amount (g)3Asquare1.250.53BX2.513Ctriangle3.751.5
[0180]For AgNO3 concentrations of 1.25 wt % and 2.5w %, only thin nanowires were produced, wherein the nanowires produced at 2.5 wt % AgNO3 were significant...
example 4
[0181]The silver nanowires of Examples 4A and 4 B were made according the process described above in Examples 2A-2G, using poly(VP-co-DADMAN) having a1 wt % DAMAN content at two different amounts of AgNO3.
[0182]FIG. 4 shows the size distributions of the nanostructure products Examples 4A and 4B. The amount of AgNO3 used in each synthesis, as well as the symbol used to represent the nanostructure product in FIG. 4, is listed in TABLE IV below.
TABLE IVSymbol inZone ofAgNO3AgNO3Example #FIG. 4FIG. 2(wt %)amount (g)4AtriangleI1.250.54BXII2.51
example 5
[0183]Reduced-Water Synthesis of Poly(VP-Co-DADMAN) Having a 1 Wt % DADMAN Content
[0184]The synthesis of poly(VP-co-DADMAN) is composed of two steps:
[0185]The first step was a counter-ion exchange to form DADMAN (Diallydimethylammonium nitrate) from commercially-available DADMAC (Diallydimethylammonium chloride). To exchange the counter-ion, a solution of 13.54 g of AgNO3 dissolved in 6.44 g of deionized water was added to 21.00 g of DADMAC in water (65 wt %). The molar ratio of AgNO3 to DADMAC is 1 to 1.05 in order to remove all of the AgNO3 (which would otherwise give a black color to the solution). After vortex stirring, two phases appeared. The liquid supernatant, which contained DADMAN in water, is collected. The white silver solid precipitate of AgCl is washed with 5 mL of water and then centrifuged a second time to extract all the DADMAN monomer from it. The combined supernatants were filtered through a 0.20 μm filter and added to 1452 g of vinylpyrrolidone (VP) and 130 g of ...
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