Colloidal Assembly and Separation under UV-Induced Convective Flows and on Inclines

Joshua E. Kauffman; Benjamin M. Tansi; Christopher LaSalle; Raj Kumar Manna; Oleg E. Shklyaev; Anna C. Balazs; Ayusman Sen

doi:10.1002/cnma.202100082

Colloidal Assembly and Separation under UV-Induced Convective Flows and on Inclines

Joshua E. Kauffman, Benjamin M. Tansi, Christopher LaSalle, Raj Kumar Manna, Oleg E. Shklyaev, Anna C. Balazs, Ayusman Sen

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

2 Scopus citations

Abstract

Achieving directed motility and separation of colloidal particles is a crucial requirement in a range of technological areas. Herein, we describe a system that exploits the photothermal properties of plasmonic nanoparticles for the assembly and separation of larger microparticles. Irradiating an aqueous suspension of gold or silver nanoparticles with UV light generates thermal convection which can be used to move and organize larger particles. Moving the UV light source allows the relocation of the particle cluster. In addition, thermal convection can be used to separate inert particles of different sizes on an inclined plane. Since fluid motion stems from thermal convection, collection and separation can be reversed simply by turning off the UV light enabling a rapid on-demand response system.

Original language	English (US)
Pages (from-to)	805-810
Number of pages	6
Journal	ChemNanoMat
Volume	7
Issue number	7
DOIs	https://doi.org/10.1002/cnma.202100082
State	Published - Jul 2021

All Science Journal Classification (ASJC) codes

Biomaterials
Renewable Energy, Sustainability and the Environment
Energy Engineering and Power Technology
Materials Chemistry

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10.1002/cnma.202100082

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title = "Colloidal Assembly and Separation under UV-Induced Convective Flows and on Inclines",

abstract = "Achieving directed motility and separation of colloidal particles is a crucial requirement in a range of technological areas. Herein, we describe a system that exploits the photothermal properties of plasmonic nanoparticles for the assembly and separation of larger microparticles. Irradiating an aqueous suspension of gold or silver nanoparticles with UV light generates thermal convection which can be used to move and organize larger particles. Moving the UV light source allows the relocation of the particle cluster. In addition, thermal convection can be used to separate inert particles of different sizes on an inclined plane. Since fluid motion stems from thermal convection, collection and separation can be reversed simply by turning off the UV light enabling a rapid on-demand response system.",

author = "Kauffman, {Joshua E.} and Tansi, {Benjamin M.} and Christopher LaSalle and Manna, {Raj Kumar} and Shklyaev, {Oleg E.} and Balazs, {Anna C.} and Ayusman Sen",

note = "Funding Information: The work was funded by the Department of Energy, Office of Basic Energy Sciences (DOE-DE-SC0020964). ACB acknowledges support from the DOE grant DE-FG02-90ER45438. We also thank Subhadip Ghosh for helpful discussions related to nanoparticle synthesis and the Materials Research Institute at Penn State University for characterization assistance. Funding Information: The work was funded by the Department of Energy, Office of Basic Energy Sciences (DOE‐DE‐SC0020964). ACB acknowledges support from the DOE grant DE‐FG02‐90ER45438. We also thank Subhadip Ghosh for helpful discussions related to nanoparticle synthesis and the Materials Research Institute at Penn State University for characterization assistance. Publisher Copyright: {\textcopyright} 2021 Wiley-VCH GmbH",

year = "2021",

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doi = "10.1002/cnma.202100082",

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AU - Kauffman, Joshua E.

AU - Tansi, Benjamin M.

AU - LaSalle, Christopher

AU - Manna, Raj Kumar

AU - Shklyaev, Oleg E.

AU - Balazs, Anna C.

AU - Sen, Ayusman

N1 - Funding Information: The work was funded by the Department of Energy, Office of Basic Energy Sciences (DOE-DE-SC0020964). ACB acknowledges support from the DOE grant DE-FG02-90ER45438. We also thank Subhadip Ghosh for helpful discussions related to nanoparticle synthesis and the Materials Research Institute at Penn State University for characterization assistance. Funding Information: The work was funded by the Department of Energy, Office of Basic Energy Sciences (DOE‐DE‐SC0020964). ACB acknowledges support from the DOE grant DE‐FG02‐90ER45438. We also thank Subhadip Ghosh for helpful discussions related to nanoparticle synthesis and the Materials Research Institute at Penn State University for characterization assistance. Publisher Copyright: © 2021 Wiley-VCH GmbH

PY - 2021/7

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N2 - Achieving directed motility and separation of colloidal particles is a crucial requirement in a range of technological areas. Herein, we describe a system that exploits the photothermal properties of plasmonic nanoparticles for the assembly and separation of larger microparticles. Irradiating an aqueous suspension of gold or silver nanoparticles with UV light generates thermal convection which can be used to move and organize larger particles. Moving the UV light source allows the relocation of the particle cluster. In addition, thermal convection can be used to separate inert particles of different sizes on an inclined plane. Since fluid motion stems from thermal convection, collection and separation can be reversed simply by turning off the UV light enabling a rapid on-demand response system.

AB - Achieving directed motility and separation of colloidal particles is a crucial requirement in a range of technological areas. Herein, we describe a system that exploits the photothermal properties of plasmonic nanoparticles for the assembly and separation of larger microparticles. Irradiating an aqueous suspension of gold or silver nanoparticles with UV light generates thermal convection which can be used to move and organize larger particles. Moving the UV light source allows the relocation of the particle cluster. In addition, thermal convection can be used to separate inert particles of different sizes on an inclined plane. Since fluid motion stems from thermal convection, collection and separation can be reversed simply by turning off the UV light enabling a rapid on-demand response system.

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Colloidal Assembly and Separation under UV-Induced Convective Flows and on Inclines

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