Disposable micro stir bars by photodegradable organic encapsulation of hematite-magnetite nanoparticles

Tina Zhang; Paul Costigan; Nitin Varshney; Antonio Tricoli

doi:10.1039/c5ra22082c

Disposable micro stir bars by photodegradable organic encapsulation of hematite-magnetite nanoparticles

Tina Zhang, Paul Costigan, Nitin Varshney, Antonio Tricoli^*

^*Corresponding author for this work

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

Abstract

Development of high-throughput microfluidic systems requires engineering of novel miniaturized stirring concepts that can overcome diffusion-limited mixing in micro-vessels. Here, we present the facile and scalable fabrication of disposable magnetic micro stir bars by one-step photodegradable encapsulation of magnetically aligned iron oxide nanoparticle agglomerates with polylysine. The resulting superparamagnetic nanocomposites have a tunable aspect ratio and a nano-rough surface. Optimal composition and morphologies are determined over a broad set of self-assembly conditions leading to flexible elongated structures with excellent mixing performance. Rapid disassembly is demonstrated by in situ photo-degradation of the coating under UV light providing a simple means for their safe disposal.

Original language	English
Pages (from-to)	33843-33850
Number of pages	8
Journal	RSC Advances
Volume	6
Issue number	40
DOIs	https://doi.org/10.1039/c5ra22082c
Publication status	Published - 2016

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title = "Disposable micro stir bars by photodegradable organic encapsulation of hematite-magnetite nanoparticles",

abstract = "Development of high-throughput microfluidic systems requires engineering of novel miniaturized stirring concepts that can overcome diffusion-limited mixing in micro-vessels. Here, we present the facile and scalable fabrication of disposable magnetic micro stir bars by one-step photodegradable encapsulation of magnetically aligned iron oxide nanoparticle agglomerates with polylysine. The resulting superparamagnetic nanocomposites have a tunable aspect ratio and a nano-rough surface. Optimal composition and morphologies are determined over a broad set of self-assembly conditions leading to flexible elongated structures with excellent mixing performance. Rapid disassembly is demonstrated by in situ photo-degradation of the coating under UV light providing a simple means for their safe disposal.",

author = "Tina Zhang and Paul Costigan and Nitin Varshney and Antonio Tricoli",

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AU - Zhang, Tina

AU - Costigan, Paul

AU - Varshney, Nitin

AU - Tricoli, Antonio

N1 - Publisher Copyright: © The Royal Society of Chemistry 2016.

PY - 2016

Y1 - 2016

N2 - Development of high-throughput microfluidic systems requires engineering of novel miniaturized stirring concepts that can overcome diffusion-limited mixing in micro-vessels. Here, we present the facile and scalable fabrication of disposable magnetic micro stir bars by one-step photodegradable encapsulation of magnetically aligned iron oxide nanoparticle agglomerates with polylysine. The resulting superparamagnetic nanocomposites have a tunable aspect ratio and a nano-rough surface. Optimal composition and morphologies are determined over a broad set of self-assembly conditions leading to flexible elongated structures with excellent mixing performance. Rapid disassembly is demonstrated by in situ photo-degradation of the coating under UV light providing a simple means for their safe disposal.

AB - Development of high-throughput microfluidic systems requires engineering of novel miniaturized stirring concepts that can overcome diffusion-limited mixing in micro-vessels. Here, we present the facile and scalable fabrication of disposable magnetic micro stir bars by one-step photodegradable encapsulation of magnetically aligned iron oxide nanoparticle agglomerates with polylysine. The resulting superparamagnetic nanocomposites have a tunable aspect ratio and a nano-rough surface. Optimal composition and morphologies are determined over a broad set of self-assembly conditions leading to flexible elongated structures with excellent mixing performance. Rapid disassembly is demonstrated by in situ photo-degradation of the coating under UV light providing a simple means for their safe disposal.

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DO - 10.1039/c5ra22082c

M3 - Article

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VL - 6

SP - 33843

EP - 33850

JO - RSC Advances

JF - RSC Advances

IS - 40

ER -

Disposable micro stir bars by photodegradable organic encapsulation of hematite-magnetite nanoparticles

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