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wandong8994新蟲 (小有名氣)
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[求助]
共沉淀法制備納米四氧化三鐵 已有1人參與
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| 怎么樣用共沉淀法制備分散良好的納米四氧化三鐵晶體,另外還想把納米四氧化三鐵負(fù)載在膨潤(rùn)土上,應(yīng)該怎么做才好? |
四氧化三鐵制備及包覆 |
金蟲 (初入文壇)
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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,放了一個(gè)月也僅有一丁點(diǎn)沉淀 |
捐助貴賓 (職業(yè)作家)

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