Method for manufacturing metal nanowire having improved length distribution uniformity
A technology of metal nanowires and manufacturing methods, applied in the field of metal nanowires, can solve problems such as strict visual recognition requirements, reduced transparency, and hindrance to the flexibility of final products, and achieve the effect of reducing the burden of solid-liquid separation operations
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Embodiment 1
[0086] (Cross-flow purification process)
[0087] The silver nanowire dispersion (equivalent to Figure 4 , Image 6 The dispersion liquid) was diluted with pure water to a silver nanowire concentration of 0.03% by mass, and subjected to cross-flow filtration using a porous ceramic filter for purification. At this time, a required amount of silver nanowires was prepared so that the entire amount became 5 L.
[0088] Figure 7 A photograph of the appearance of a porous ceramic tube used as a porous ceramic filter is shown in . Figure 8 The SEM photograph of the ceramic is shown in . The ceramic material is SiC (silicon carbide), and the size is 12 mm in outer diameter, 9 mm in inner diameter, and 250 mm in length. The average pore diameter by the mercury porosimetry using a mercury porosimeter manufactured by Micromeritics was 8.25 μm. In addition, the pore volume is 0.192cm 3 / g, the density is 1.82g / cm 3 , the true density is 2.80g / cm 3 , The porosity is 35.0%.
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Embodiment 2
[0109] The silver nanowires obtained in Comparative Example 2 were purified by cross-flow filtration in the same manner as in Example 1.
[0110] Figure 17 exemplifies the SEM photographs of the silver nanowires recovered after the above-mentioned purification. The average length of the silver nanowires was 10.0 μm, and the number ratio of nanowires of 5.0 μm or less was 15.0%. In addition, the average diameter was 30.1 nm, and the average aspect ratio was 10000 / 30.1≒333.
[0111] Figure 18 The length distribution (number ratio) of the silver nanowires obtained in this example is shown in . and before purification ( Figure 16 ), the proportion of short lines is significantly reduced.
[0112] For reference, Figure 19 SEM photographs of silver nanowires recovered as the filtrate of cross-flow filtration are exemplified in . in addition, Figure 20 The length distribution (number ratio) of the silver nanowire recovered from this filtrate is shown in .
Embodiment 3
[0114] (Nanowire Synthesis Process)
[0115] Silver nanowires were obtained in the following manner.
[0116] Propylene glycol (1,2-propanediol) as an alcohol solvent, silver nitrate as a silver compound, lithium chloride as a chloride, potassium bromide as a bromide, lithium hydroxide as an alkali metal hydroxide, as Aluminum nitrate nonahydrate of aluminum salt, a copolymer of vinylpyrrolidone and diallyldimethylammonium nitrate (99% by mass of vinylpyrrolidone, diallyldimethylammonium nitrate) as an organic protective agent 1% by mass of ammonium nitrate was used to prepare a copolymer, and the weight average molecular weight was 130000).
[0117] By adding 0.15 g of a propylene glycol solution containing 1% by mass of lithium chloride, 0.10 g of a propylene glycol solution containing 0.25% by mass of potassium bromide, and 0.20 g of a propylene glycol solution containing 1% by mass of lithium hydroxide to 25.0 g of propylene glycol at room temperature, including 0.16 g o...
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