Size evolution of gold nanoparticles in a millifluidic reactor

Yuehao Li; Ashwin Sanampudi; Vanga Raji Reddy; Sanchita Biswas; Krishnaswamy Nandakumar; Dawit Yemane; Jost Goettert; Challa S.S.R. Kumar

doi:10.1002/cphc.201100726

Size evolution of gold nanoparticles in a millifluidic reactor

Yuehao Li, Ashwin Sanampudi, Vanga Raji Reddy, Sanchita Biswas, Krishnaswamy Nandakumar, Dawit Yemane, Jost Goettert, Challa S.S.R. Kumar^*

^*Corresponding author for this work

Research output: Contribution to journal › Article › peer-review

24 Scopus citations

Abstract

The size evolution of gold nanoparticles in a millifluidic reactor is investigated using spatially resolved transmission electron microscopy (TEM). The experimental data is supported by numerical simulations, carried out to study the residence-time distribution (RTD) of tracers that have the same properties as Au ions. Size and size distribution of the particles within the channels are influenced by the mixing zones as well as the RTD. However, the Au nanoparticles obtained show a broader size distribution even at the shortest investigated residence time of 3.53 s, indicating that in addition to surface growth reaction kinetics also plays an important role. The comparison of time resolved particle growth within the millifluidic channel with flask-based reactions reveals that the particle size can be controlled better within millifluidic channels. Overall, the results indicate potential opportunities to utilize easy to fabricate millifluidic reactors for the synthesis of nanoparticles, as well as as for carrying out time resolved kinetic studies.

Original language	English
Pages (from-to)	177-182
Number of pages	6
Journal	ChemPhysChem
Volume	13
Issue number	1
DOIs	https://doi.org/10.1002/cphc.201100726
State	Published - 16 Jan 2012
Externally published	Yes

Keywords

millifluidic reactors
nanoparticles
numerical simulations
residence time distribution
transmission electron microscopy

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10.1002/cphc.201100726

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title = "Size evolution of gold nanoparticles in a millifluidic reactor",

abstract = "The size evolution of gold nanoparticles in a millifluidic reactor is investigated using spatially resolved transmission electron microscopy (TEM). The experimental data is supported by numerical simulations, carried out to study the residence-time distribution (RTD) of tracers that have the same properties as Au ions. Size and size distribution of the particles within the channels are influenced by the mixing zones as well as the RTD. However, the Au nanoparticles obtained show a broader size distribution even at the shortest investigated residence time of 3.53 s, indicating that in addition to surface growth reaction kinetics also plays an important role. The comparison of time resolved particle growth within the millifluidic channel with flask-based reactions reveals that the particle size can be controlled better within millifluidic channels. Overall, the results indicate potential opportunities to utilize easy to fabricate millifluidic reactors for the synthesis of nanoparticles, as well as as for carrying out time resolved kinetic studies.",

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AU - Sanampudi, Ashwin

AU - Raji Reddy, Vanga

AU - Biswas, Sanchita

AU - Nandakumar, Krishnaswamy

AU - Yemane, Dawit

AU - Goettert, Jost

AU - Kumar, Challa S.S.R.

PY - 2012/1/16

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N2 - The size evolution of gold nanoparticles in a millifluidic reactor is investigated using spatially resolved transmission electron microscopy (TEM). The experimental data is supported by numerical simulations, carried out to study the residence-time distribution (RTD) of tracers that have the same properties as Au ions. Size and size distribution of the particles within the channels are influenced by the mixing zones as well as the RTD. However, the Au nanoparticles obtained show a broader size distribution even at the shortest investigated residence time of 3.53 s, indicating that in addition to surface growth reaction kinetics also plays an important role. The comparison of time resolved particle growth within the millifluidic channel with flask-based reactions reveals that the particle size can be controlled better within millifluidic channels. Overall, the results indicate potential opportunities to utilize easy to fabricate millifluidic reactors for the synthesis of nanoparticles, as well as as for carrying out time resolved kinetic studies.

AB - The size evolution of gold nanoparticles in a millifluidic reactor is investigated using spatially resolved transmission electron microscopy (TEM). The experimental data is supported by numerical simulations, carried out to study the residence-time distribution (RTD) of tracers that have the same properties as Au ions. Size and size distribution of the particles within the channels are influenced by the mixing zones as well as the RTD. However, the Au nanoparticles obtained show a broader size distribution even at the shortest investigated residence time of 3.53 s, indicating that in addition to surface growth reaction kinetics also plays an important role. The comparison of time resolved particle growth within the millifluidic channel with flask-based reactions reveals that the particle size can be controlled better within millifluidic channels. Overall, the results indicate potential opportunities to utilize easy to fabricate millifluidic reactors for the synthesis of nanoparticles, as well as as for carrying out time resolved kinetic studies.

KW - millifluidic reactors

KW - nanoparticles

KW - numerical simulations

KW - residence time distribution

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Size evolution of gold nanoparticles in a millifluidic reactor

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Keywords

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