Nanotech 2010

The Influence of the flow rate on the size of gold nanoparticles obtained in multilaminating, interdigital micromixer

M. Luty-Blocho, K. Fitzner, V. Hessel, P. Loeb, M. Maskos, D. Metzke, K. Paclawski, M. Wojnicki, M. Luty-Blocho
AGH University of Science and Technology, PL

Keywords: gold nanoparticles, interdigital micromixer, stabilization


Key elements of gold nanoparticle formation were investigated for developing new multi-step microprocessing approach which finally targets at an integrated systemic solution comprising tailored microfluidic units for the essential steps during nanoparticle formation (mixing, reduction & seed formation, growth, stabilization). In this paper, the reaction step is tuned from medium to fast through choice of the reducing agent making use of the well-controlled and fast mixing conditions provided by the multilaminating, interdigital micromixer (IMM, SIMM-V2). Gold nanoparticles were obtained at room temperature as a result of reduction reaction of HAuCl4 with either L- ascorbic acid or sodium borohydrate. PVA was added to reacting solution as the stabilizer. The influence of the flow rate on the size of gold nanoparticles was studied in the range of flow rates of 0.1 – 10.0 mL/min. As a result of these experiments colloidal gold was obtained. During experiments, large impact of the flow rate on the size of gold nanoparticles was observed. In case of reduction of HAuCl4 with L- ascorbic acid NPs with size of about 0.8 – 4 for the higher flow rate (7.5 mL/min). The smaller size (between 0.6 – 3 nm for higher flow rate 10.0 mL/min) was obtained when NaBH4 as a reducer was used.
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