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wandong8994新虫 (小有名气)
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[求助]
共沉淀法制备纳米四氧化三铁 已有1人参与
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| 怎么样用共沉淀法制备分散良好的纳米四氧化三铁晶体，另外还想把纳米四氧化三铁负载在膨润土上，应该怎么做才好？ |
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【答案】应助回帖
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Synthesis of magnetic nanoparticles (Fe 3 O 4 -NP) : Citrate-stabilized Fe 3 O 4 -NP were synthesized following the Massart precipitation method, followed by nanoparticles surface functionalization with citric acid. [ 13 ] Briefl y, 0.86 g FeCl 2 and 2.35 g FeCl 3 were mixed in 40 mL water and heated to 80 °C under argon in a three-necked fl ask. While vigorously stirring the reaction mixture, 5 mL of NH 4 OH was introduced by a syringe and heating was continued for 30 min. Next, 1 g of citric acid in 2 mL water was introduced and the temperature raised to 95 °C while stirring was continued for an additional 90 min. Subsequently, the nanoparticle dispersion was dialyzed against water in a 12–14 kD cut-off cellulose membrane (Roth, Germany), resulting in a stable dispersion of negatively charged magnetite nanoparticles. Particle size and zeta-potential were determined via DLS and electrophoretic mobility measurements, respectively, using Malvern Nano ZS revealing a mean particle size of 30 nm and a zeta potential of –25 mV. AM上的，自己做的，分散性很好，放了一个月也仅有一丁点沉淀 |
2楼2014-02-23 22:07:19
kangshisan
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3楼2017-10-24 21:04:39
