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This preparation method uses citric acid as a chelating agent, and adjusts the pH value with concentrated nitric acid. Only when the pH value of the solution is around 3.5 can silver micro-nano structures with good morphology be obtained, which is corrosive and cumbersome to operate.
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Embodiment 1）
[0029] The synthetic method of the present embodiment flower shape silver microparticles comprises the following steps:
[0030] ① Weigh 1.0004g (0.005680 mol) white solidpowder of ascorbic acid (CAS No.: 50-81-7)) into a beaker filled with 10mL of deionized water, stir to dissolve ascorbic acid and set aside, the concentration of ascorbic acid solution is 0.5680 mol / L.
[0031] Weigh 0.9987g of silver nitrate (0.005879mol) crystals and add it to 10mL of deionized water, stir to dissolve the silver nitrate for use, and the concentration of the silver nitrate solution is 0.5879 mol / L.
[0032] The molar ratio of ascorbic acid to silver nitrate is preferably controlled at 0.8-1.2:1, and is 0.97:1 in this embodiment.
[0033] The concentration of the ascorbic acid solution is preferably controlled at 0.5 mol / L-0.7 mol / L; the concentration of the silver nitrate solution is preferably controlled at 0.5 mol / L-0.75 mol / L.
[0034] ② Add the ascorbic acid solution configured in ste...
Embodiment 2）
[0042] The synthetic method of the flower-shaped silver microparticles of the present embodiment is the same as that of Example 1, except that:
[0043] In step ①, add 1.0006g of ascorbic acid to 10ml of deionized water, stir to dissolve the ascorbic acid; add 0.9985g of silver nitrate crystals to 10ml of deionized water, and stir to dissolve the silver nitrate.
[0044] In step ②, add the ascorbic acid solution prepared in step ① into the silver nitrate solution, and immediately add 1.6021 g of cleaned 201 stainless steel sheet to the mixed solution; while the reaction material is magnetically stirred, use a micro pump to feed air into the reaction material , After 240min, the reaction ended. The air flow rate is 8 mL / min.
[0045] The SEM results of the product are shown in figure 2 , the product has a relatively uniform morphology and good dispersion. The SEM photo of the powder shows that the particles are rose-shaped, and the particle size of the particles is about 3 ...
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Abstract
The invention discloses a method for synthesizing flower-shaped silver micro-particles. The method comprises the following steps of respectively measuring ascorbic acidsolidpowder and silver nitratecrystal, and respectively dissolving the ascorbic acidsolidpowder and the silver nitratecrystal into deionized water for standby use; placing the prepared ascorbic acid solution into the silver nitrate solution, and ensuring the mol ratio of the ascorbic acid and the silver nitrate to be (0.8-1.2):1; immediately adding a cleaned stainless steel sheet into the mixed solution; magnetically stirring the reaction materials for 180min to 360min after the stainless steel sheet is added, and ending the reaction; taking out and centrifugally separating the stainless steel sheet in the material after the reaction is ended, and precipitating and washing the stainless steel sheet to obtain the flower-shaped silver micro-particles. By adopting the method, the shape of a product is controllable, simplicity in operation can be realized, the condition is moderate, and the repeatability is good.
Description
[0001] This application is a divisional application of the invention patent application with the application number 201310526203.X and the application date of October 30, 2013, and the invention name is "Synthesis method of flower-shaped silver microparticles". technical field [0002] The invention relates to a method for synthesizing the shape of silver particles, in particular to a method for synthesizing flower-shaped silver micro particles. Background technique [0003] Silver has unique properties such as catalysis, antibacterial, nonlinear optics, and electrical and thermal conductivity, and has broad application prospects in the fields of inorganic antibacterial agents, catalytic materials, and conductive pastes. The properties and applications of silver are strongly dependent on the size and morphology of silver particles. Silver is currently synthesized in different shapes, sizes and structures. [0004] Nano-metal particles have agglomeration and bridging phenome...
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