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Real_edwards新蟲 (初入文壇)
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[求助]
求助用PVP制取AgCl納米顆粒的原理
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本人本科生小白,差不多知道這是一個溶膠法制取納米顆粒的過程,但是原理什么不是很了解,特別是一開始滴入NaCl后,PVP和NaCl是怎么形成溶膠體系的,希望大家能夠指導一下,謝謝!下面是制取的過程: Hybrid Nanoparticles: In a typical synthesis, ethylene glycol (12 mL, J. T. Baker) in a 20-mL scintillation vial (borosilicate glass with a polyethylene cap, VWR) was heated at 60 8C for 30 min. Poly(vinyl pyrrolidone) (PVP, 54 mg,MW55000, Aldrich) and NaCl (45 mg, Fisher Chemicals) were sequentially added to the ethylene glycol. After both PVP and NaCl were completely dissolved, ethylene glycol solution (1 mL) of AgNO3 (57 mg), which was prepared at room temperature of 22 8C, was injected via a pipette to the above ethylene glycol solution. Temperature of the solution was continued to maintain at 60 8C for additional 30 min, resulting in the formation of a milky dispersion containing AgCl nanoparticles. The vial containing milky dispersion was then transferred to an oil bath set at 160 8C to continue reaction for 35 min until the dispersion became pale red. The vial was taken out of the oil bath and cooled down to room temperature in the air. Magnetic stirring was maintained at 300 rpm and 240 rpm for the reactions at 60 8C and 160 8C, respectively, throughout the synthesis. |
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