A Microfluidic Device for the Investigation of Rapid Gold Nanoparticle Formation in Continuous Turbulent Flow

16th International Conference on X-ray Absorption Fine Structure

Hofmann, G.^1 ; Tofighi, G.^1 ; Rinke, G.^2 ; Baier, S.^1 ; Ewinger, A.^2 ; Urban, A.^2 ; Wenka, A.^2 ; Heideker, S.^2 ; Jahn, A.^3 ; Dittmeyer, R.^2 ; Grunwaldt, J.-D.^1,4

Karlsruhe Institute of Technology, Institute for Chemical Technology and Polymer Chemistry (ITCP), Karlsruhe, Germany^1

Karlsruhe Institute of Technology, Institute for Micro Process Engineering (IMVT), Karlsruhe, Germany^2

TU Dresden, Institute of Semiconductors and Microsystems, Dresden, Germany^3

Karlsruhe Institute of Technology, Institute of Catalysis Research and Technology (IKFT), Karlsruhe, Germany^4

关键词: Free liquid jet;    Gold nanoparticle formation;    High-time resolution;    Integrated microfluidic chips;    Micro-fluidic devices;    Microfluidic chip;    Short reaction time;    Situ x-rays;   

Others  :  https://iopscience.iop.org/article/10.1088/1742-6596/712/1/012072/pdf
DOI  :  10.1088/1742-6596/712/1/012072

来源: IOP

【 摘 要 】

A new setup with an integrated microfluidic chip with small dead time, high time resolution and compatibility with in situ X-ray absorption (XAS) measurements is presented. It can also be combined with a free liquid jet. By using the microfluidic chip the short reaction times from 2 to 20 milliseconds can be observed, beyond that an external cyclone mixer for extended observation times was applied. The reduction of gold ions with tetrakis(hydroxy-methyl)phosphonium (THPC) has been investigated in the microfluidic setup to monitor this reaction yielding small gold nanoparticles, requiring preferentially a free liquid jet.