首页|Investigation and mitigation of reagent ageing during the continuous flow synthesis of patchy particles
Investigation and mitigation of reagent ageing during the continuous flow synthesis of patchy particles
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NSTL
Patchy particles, which comprise a core particle of one material partially covered by a thin layer of another, offer great promise for tailored particle-based materials and devices in the future. This study concerns the investigation and improvement of a potentially gram-scalable continuous flow process based on a cascade of two T-mixers for the synthesis of thin, conformal silver patches on colloidal silica particles. The starting point of the work is the observation that on seemingly random occasions the process results in patches having undesired spiky protrusions. Through a systematic study of reagent ageing supported by scanning electron microscopy, optical spectroscopy and chemical equilibrium calculations it can be ascertained that the desired product morphology is only obtained through carbon dioxide absorption by the dilute ammonia solution used in the reaction. It is shown that the ageing process can be emulated for fresh reagents by addition of ammonium nitrate or nitric acid.
Continuous flow synthesisStatic T-mixerHeterogeneous nucleation and growth Absorption of carbon dioxide by aqueous ammoniaLocalized surface plasmon resonanceChemical equilibrium
Andreas Volkl、Robin N. Klupp Taylor
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Institute of Particle Technology, Friedrich-Alexander University of Erlangen-Nurnberg, Cauerstr. 4, 91058 Erlangen, Germany
NSTL
