Dielectrophoretic enrichment of low-abundance nanoparticles using a nanotip-concentrator for nanoengineered medicine and biology

Woon Hong Yeo*, Adrian M. Kopacz, Jong Hoon Kim, Xinqi Chen, Jinsong Wu, Dayong Gao, John A. Stamatoyannopoulos, Kyong Hoon Lee, Wing Kam Liu, Jae Hyun Chung

*Corresponding author for this work

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Abstract

Enrichment of low-concentration nanoparticles (NPs) is of great interest in medicine and biology. In particular, the enrichment of biomolecules such as DNA and protein can have broad impacts on disease diagnosis and drug discovery. Currently available methods utilize centrifugation or magnetic field. However, these methods are limited in cumbersome preparation steps and low sensitivity. Electric field-based methods have demonstrated potential for NP enrichment, but conventional planar electrodes trapping NPs are limited in sensitivity and imaging capability. Here, we present a nanotip-concentrator using dielectrophoresis (DEP) for NP enrichment. Unlike conventional planar electrodes, a nanostructured probe-tip can facilitate more sensitive detection of NPs because of high electric field strength. The NP enrichment mechanism is studied through numerical computation, and then validated through experiment using Au NPs. For optimized enrichment of NPs, 8 nm-long oligonucleotides are used to enrich through hybridization reactions, which shows the sensitivity at 10 aM (9 copies in a 1.5 μL sample). The nanotip-concentrator will offer a novel enrichment platform for highly sensitive NP detection and analysis.

Original languageEnglish (US)
Title of host publicationBiomedical and Biotechnology Engineering; Nanoengineering for Medicine and Biology
PublisherAmerican Society of Mechanical Engineers (ASME)
Pages941-945
Number of pages5
ISBN (Print)9780791854884
DOIs
StatePublished - 2011
EventASME 2011 International Mechanical Engineering Congress and Exposition, IMECE 2011 - Denver, CO, United States
Duration: Nov 11 2011Nov 17 2011

Publication series

NameASME 2011 International Mechanical Engineering Congress and Exposition, IMECE 2011
Volume2

Other

OtherASME 2011 International Mechanical Engineering Congress and Exposition, IMECE 2011
CountryUnited States
CityDenver, CO
Period11/11/1111/17/11

ASJC Scopus subject areas

  • Mechanical Engineering

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