Synthesis of Silver Nanoparticles Using a Microfluidic Impinging Jet Reactor
Synthesis of Silver Nanoparticles Using a Microfluidic Impinging Jet Reactor
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DOI：
10.1556/1846.2016.00015
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发表时间：
2016-09-01
影响因子：
2.7
通讯作者：
Gavriilidis, Asterios
中科院分区：
文献类型：
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作者：
Baber, Razwan;Mazzei, Luca;Gavriilidis, Asterios
利用撞击射流反应器（IJR）的独特性能，即高效混合和无通道壁避免结垢，研究了在该反应器中制备银纳米颗粒（NPs）的过程。通过在氢氧化钠存在下用硼氢化钠还原硝酸银，在室温下形成银NP。使用两种类型的配体来稳定NP，柠檬酸三钠和聚乙烯醇（PVA）。韦伯数，惯性力和表面张力之间的比值，被用来表征冲击射流中的流动。研究了韦伯数在13-176范围内的流态。在较低的韦伯数（90）下确定了液体片/链状态。使用Villermaux-Dushman反应系统和平均混合（IEM）模型交换相互作用，发现混合时间在1- 7 ms范围内。最快的混合发生在韦伯数约。90.使用柠檬酸三钠作为配体，当使用0.5 mm喷嘴将流速从32 mL/min增加到72 mL/min时，NP尺寸从7.9 +/-5.8 nm减小到3.4 +/-1.4 nm，并且当使用0.25 mm喷嘴将流速从20 mL/min增加到32 mL/min时，NP尺寸从6.4 +/-3.4 nm减小到5.1 +/-4.6 nm。使用PVA作为配体，NP尺寸使用0.5mm喷射器从5.4 +/-1.6nm减小到4.2 +/-1.1nm，并且使用0.25mm喷射器在4.3 + 1 nm和4.7 + 1.3nm之间保持相对恒定。通常，当混合更快时，NP的尺寸减小。
Synthesis of silver nanoparticles (NPs) in an impinging jet reactor (IJR) was investigated due to its unique properties of efficient mixing and lack of channel walls which avoid fouling. Silver NPs were formed at room temperature by reducing silver nitrate with sodium borohydride in the presence of sodium hydroxide. Two types of ligand were used to stabilize the NPs, trisodium citrate, and polyvinyl alcohol (PVA). Weber number, the ratio between inertial forces and surface tension forces, is used to characterize flow in impinging jets. Flow regimes were investigated for Weber numbers in the range of 13-176. A liquid sheet/chain regime was identified at lower Weber numbers (90). Mixing time was found to be in the range 1-7ms, using the Villermaux-Dushman reaction system and interaction by exchange with the mean mixing (IEM) model. Fastest mixing occurred at Weber number ca. 90. Using trisodium citrate as a ligand, NP size decreased from 7.9 +/- 5.8 nm to 3.4 +/- 1.4 nm when flow rate was increased from 32 mL/min to 72 mL/min using 0.5 mm jets, and from 6.4 +/- 3.4 nm to 5.1 +/- 4.6 nm when flow rate was increased from 20 mL/min to 32 mL/min using 0.25 mm jets. Using PVA as a ligand, NP size decreased from 5.4 +/- 1.6 nm to 4.2 +/- 1.1 nm using 0.5 mm jets and stayed relatively constant between 4.3 + 1 nm and 4.7 + 1.3 nm using 0.25 mm jets. In general, the size of the NPs decreased when mixing was faster.