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Dynamic characterization of nanoparticles production in a droplet-based continuous flow microreactor

Dynamic characterization of nanoparticles production in a droplet-based continuous flow microreactor
Dynamic characterization of nanoparticles production in a droplet-based continuous flow microreactor
The present work was focused on the dynamic characterization of nanoparticles production under continuous flow in a droplet-based spiral-shaped microreactor. A novel drainage design was incorporated into the microreactor channel network for eliminating the commonly encountered problems of clogging and coalescence of microdroplets containing nanoparticles in the microchannel. Through precise manipulation of droplets formation for investigating the precipitation process of iron oxide, one-to-one pairing and fusion of reactant droplets were obtained and monitored in a real-time manner through digital imaging, where optimised flow rate ratios (in a range of 0.3–0.5) of aqueous phase to oil phase were applied. The nanoprecipitation process was observed and further analysed, indicating that the formation of precipitates was determined by the diffusion of OH- after coalescence of reactants droplets. By characterising the Fe3O4 nanoparticles produced, it demonstrated that smaller droplets were beneficial to obtaining high quality nanoparticles in terms of size control and size distribution. Moreover, the kinetics of the nucleation process was investigated through statistic calculation. Initial results suggested that heterogeneous nucleation occurring inside droplets was likely due to the presence of impurities-mediated (e.g. surfactants) or collision-induced nucleation events.
0263-8762
247-257
Ma, Haiyun
7fe0d7ae-2b52-4a4f-8a71-d0752e5935c3
Jin, Nan
4c238610-7344-4b96-aeef-f039b663691c
Zhang, Peng
3b7dc273-0330-4b17-91a5-0075836e098d
Zhou, Yufei
b8ec69d1-e371-42c2-8bb5-1e0ce507f258
Zhao, Yuchao
0b5eafdf-0011-4a02-840f-e5b88b61a708
Zhang, Xunli
d7cf1181-3276-4da1-9150-e212b333abb1
Lü, Hongying
6566c145-2b3d-4033-90f1-33e678ea78cf
Liu, Jie
41d72bb6-a177-4906-b4cf-083c4573abd8
Ma, Haiyun
7fe0d7ae-2b52-4a4f-8a71-d0752e5935c3
Jin, Nan
4c238610-7344-4b96-aeef-f039b663691c
Zhang, Peng
3b7dc273-0330-4b17-91a5-0075836e098d
Zhou, Yufei
b8ec69d1-e371-42c2-8bb5-1e0ce507f258
Zhao, Yuchao
0b5eafdf-0011-4a02-840f-e5b88b61a708
Zhang, Xunli
d7cf1181-3276-4da1-9150-e212b333abb1
Lü, Hongying
6566c145-2b3d-4033-90f1-33e678ea78cf
Liu, Jie
41d72bb6-a177-4906-b4cf-083c4573abd8

Ma, Haiyun, Jin, Nan, Zhang, Peng, Zhou, Yufei, Zhao, Yuchao, Zhang, Xunli, Lü, Hongying and Liu, Jie (2019) Dynamic characterization of nanoparticles production in a droplet-based continuous flow microreactor. Chemical Engineering Research and Design, 144, 247-257. (doi:10.1016/j.cherd.2019.02.007).

Record type: Article

Abstract

The present work was focused on the dynamic characterization of nanoparticles production under continuous flow in a droplet-based spiral-shaped microreactor. A novel drainage design was incorporated into the microreactor channel network for eliminating the commonly encountered problems of clogging and coalescence of microdroplets containing nanoparticles in the microchannel. Through precise manipulation of droplets formation for investigating the precipitation process of iron oxide, one-to-one pairing and fusion of reactant droplets were obtained and monitored in a real-time manner through digital imaging, where optimised flow rate ratios (in a range of 0.3–0.5) of aqueous phase to oil phase were applied. The nanoprecipitation process was observed and further analysed, indicating that the formation of precipitates was determined by the diffusion of OH- after coalescence of reactants droplets. By characterising the Fe3O4 nanoparticles produced, it demonstrated that smaller droplets were beneficial to obtaining high quality nanoparticles in terms of size control and size distribution. Moreover, the kinetics of the nucleation process was investigated through statistic calculation. Initial results suggested that heterogeneous nucleation occurring inside droplets was likely due to the presence of impurities-mediated (e.g. surfactants) or collision-induced nucleation events.

Text
Nanoparticles Production in Microreactor Ma2019 accepted - Accepted Manuscript
Restricted to Repository staff only until 19 February 2020.
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More information

Accepted/In Press date: 4 February 2019
e-pub ahead of print date: 19 February 2019
Published date: April 2019

Identifiers

Local EPrints ID: 428534
URI: https://eprints.soton.ac.uk/id/eprint/428534
ISSN: 0263-8762
PURE UUID: 085edaa2-7a58-4246-bc37-af8aa0deadfb

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Date deposited: 01 Mar 2019 17:30
Last modified: 19 Jul 2019 16:41

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