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Zhang S, Xu B, Elsayed M, Nan F, Liang W, Valley JK, Liu L, Huang Q, Wu MC, Wheeler AR. Optoelectronic tweezers: a versatile toolbox for nano-/micro-manipulation. Chem Soc Rev 2022; 51:9203-9242. [DOI: 10.1039/d2cs00359g] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
This review covers the fundamentals, recent progress and state-of-the-art applications of optoelectronic tweezers technology, and demonstrates that optoelectronic tweezers technology is a versatile and powerful toolbox for nano-/micro-manipulation.
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Affiliation(s)
- Shuailong Zhang
- School of Mechatronical Engineering, Beijing Institute of Technology, Room 711, Building No 6, Science and Technology Park, 5 Zhongguancun South St, Haidian District, Beijing, 100081, China
- Beijing Advanced Innovation Center for Intelligent Robots and Systems, Beijing Institute of Technology, Beijing, 100081, China
- Key Laboratory of Biomimetic Robots and Systems (Beijing Institute of Technology), Ministry of Education, Beijing 100081, China
| | - Bingrui Xu
- School of Mechatronical Engineering, Beijing Institute of Technology, Room 711, Building No 6, Science and Technology Park, 5 Zhongguancun South St, Haidian District, Beijing, 100081, China
- Beijing Advanced Innovation Center for Intelligent Robots and Systems, Beijing Institute of Technology, Beijing, 100081, China
| | - Mohamed Elsayed
- Institute of Biomedical Engineering, University of Toronto, Toronto, ON, M5S 3G9, Canada
- Donnelly Centre for Cellular and Biomolecular Research, University of Toronto, Toronto, ON, M5S 3E1, Canada
| | - Fan Nan
- Institute of Nanophotonics, Jinan University, Guangzhou 511443, China
| | - Wenfeng Liang
- School of Mechanical Engineering, Shenyang Jianzhu University, Shenyang, 110168, China
| | - Justin K. Valley
- Berkeley Lights, Inc, 5858 Horton Street #320, Emeryville, CA 94608, USA
| | - Lianqing Liu
- State Key Laboratory of Robotics, Shenyang Institute of Automation, Chinese Academy of Sciences, Shenyang 110016, China
- Institutes for Robotics and Intelligent Manufacturing, Chinese Academy of Sciences, Shenyang 110016, China
| | - Qiang Huang
- School of Mechatronical Engineering, Beijing Institute of Technology, Room 711, Building No 6, Science and Technology Park, 5 Zhongguancun South St, Haidian District, Beijing, 100081, China
- Beijing Advanced Innovation Center for Intelligent Robots and Systems, Beijing Institute of Technology, Beijing, 100081, China
- Key Laboratory of Biomimetic Robots and Systems (Beijing Institute of Technology), Ministry of Education, Beijing 100081, China
| | - Ming C. Wu
- Department of Electrical Engineering and Computer Sciences, University of California, Berkeley, California 94720, USA
| | - Aaron R. Wheeler
- Institute of Biomedical Engineering, University of Toronto, Toronto, ON, M5S 3G9, Canada
- Donnelly Centre for Cellular and Biomolecular Research, University of Toronto, Toronto, ON, M5S 3E1, Canada
- Department of Chemistry, University of Toronto, Toronto, ON, M5S 3H6, Canada
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Pritchet D, Ehmann K, Cao J, Huang J. Manipulation and Localized Deposition of Particle Groups with Modulated Electric Fields. MICROMACHINES 2020; 11:mi11020226. [PMID: 32102176 PMCID: PMC7074757 DOI: 10.3390/mi11020226] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 01/17/2020] [Revised: 02/15/2020] [Accepted: 02/21/2020] [Indexed: 06/10/2023]
Abstract
This paper presents a new micro additive manufacturing process and initial characterization of its capabilities. The process uses modulated electric fields to manipulate and deposit particles from colloidal solution in a contactless way and is named electrophoretically-guided micro additive manufacturing (EPμAM). The inherent flexibility and reconfigurability of the EPμAM process stems from electrode array as an actuator use, which avoids common issues of controlling particle deposition with templates or masks (e.g., fixed template geometry, post-process removal of masks, and unstable particle trapping). The EPμAM hardware testbed is presented alongside with implemented control methodology and developed process characterization workflow. Additionally, a streamlined two-dimensional (2D) finite element model (FEM) of the EPμAM process is used to compute electric field distribution generated by the electrode array and to predict the final deposition location of particles. Simple particle manipulation experiments indicate proof-of-principle capabilities of the process. Experiments where particle concentration and electric current strength were varied demonstrate the stability of the process. Advanced manipulation experiments demonstrate interelectrode deposition and particle group shaping capabilities where high, length-to-width, aspect ratio deposits were obtained. The experimental and FEM results were compared and analyzed; observed process limitations are discussed and followed by a comprehensive list of possible future steps.
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Affiliation(s)
- David Pritchet
- Mechanical Engineering Department, Northwestern University, Evanston, IL 60208, USA
| | - Kornel Ehmann
- Mechanical Engineering Department, Northwestern University, Evanston, IL 60208, USA
| | - Jian Cao
- Mechanical Engineering Department, Northwestern University, Evanston, IL 60208, USA
| | - Jiaxing Huang
- Materials Science and Engineering Department, Northwestern University, Evanston, IL 60208, USA
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Liang W, Liu L, Zhang H, Wang Y, Li WJ. Optoelectrokinetics-based microfluidic platform for bioapplications: A review of recent advances. BIOMICROFLUIDICS 2019; 13:051502. [PMID: 31558919 PMCID: PMC6748859 DOI: 10.1063/1.5116737] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/27/2019] [Accepted: 09/05/2019] [Indexed: 05/14/2023]
Abstract
The introduction of optoelectrokinetics (OEK) into lab-on-a-chip systems has facilitated a new cutting-edge technique-the OEK-based micro/nanoscale manipulation, separation, and assembly processes-for the microfluidics community. This technique offers a variety of extraordinary advantages such as programmability, flexibility, high biocompatibility, low-cost mass production, ultralow optical power requirement, reconfigurability, rapidness, and ease of integration with other microfluidic units. This paper reviews the physical mechanisms that govern the manipulation of micro/nano-objects in microfluidic environments as well as applications related to OEK-based micro/nanoscale manipulation-applications that span from single-cell manipulation to single-molecular behavior determination. This paper wraps up with a discussion of the current challenges and future prospects for the OEK-based microfluidics technique. The conclusion is that this technique will allow more opportunities for biomedical and bioengineering researchers to improve lab-on-a-chip technologies and will have far-reaching implications for biorelated researches and applications in the future.
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Affiliation(s)
- Wenfeng Liang
- School of Mechanical Engineering, Shenyang Jianzhu University, Shenyang 110168, China
| | - Lianqing Liu
- Authors to whom correspondence should be addressed: and
| | - Hemin Zhang
- Department of Neurology, The People’s Hospital of Liaoning Province, Shenyang 110016, China
| | | | - Wen Jung Li
- Authors to whom correspondence should be addressed: and
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Wang F, Liu L, Li G, Li P, Wen Y, Zhang G, Wang Y, Lee GB, Li WJ. Thermometry of photosensitive and optically induced electrokinetics chips. MICROSYSTEMS & NANOENGINEERING 2018; 4:26. [PMID: 31057914 PMCID: PMC6220187 DOI: 10.1038/s41378-018-0029-y] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 09/26/2017] [Revised: 05/15/2018] [Accepted: 05/24/2018] [Indexed: 06/09/2023]
Abstract
Optically induced electrokinetics (OEK)-based technologies, which integrate the high-resolution dynamic addressability of optical tweezers and the high-throughput capability of electrokinetic forces, have been widely used to manipulate, assemble, and separate biological and non-biological entities in parallel on scales ranging from micrometers to nanometers. However, simultaneously introducing optical and electrical energy into an OEK chip may induce a problematic temperature increase, which poses the potential risk of exceeding physiological conditions and thus inducing variations in cell behavior or activity or even irreversible cell damage during bio-manipulation. Here, we systematically measure the temperature distribution and changes in an OEK chip arising from the projected images and applied alternating current (AC) voltage using an infrared camera. We have found that the average temperature of a projected area is influenced by the light color, total illumination area, ratio of lighted regions to the total controlled areas, and amplitude of the AC voltage. As an example, optically induced thermocapillary flow is triggered by the light image-induced temperature gradient on a photosensitive substrate to realize fluidic hydrogel patterning. Our studies show that the projected light pattern needs to be properly designed to satisfy specific application requirements, especially for applications related to cell manipulation and assembly.
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Affiliation(s)
- Feifei Wang
- State Key Laboratory of Robotics, Shenyang Institute of Automation, Chinese Academy of Sciences, 110016 Shenyang, China
- University of Chinese Academy of Sciences, 100049 Beijing, China
- Shenzhen Academy of Robotics, 518057 Shenzhen, China
| | - Lianqing Liu
- State Key Laboratory of Robotics, Shenyang Institute of Automation, Chinese Academy of Sciences, 110016 Shenyang, China
| | - Gongxin Li
- Key Laboratory of Advanced Process Control for Light Industry of the Ministry of Education, Institute of Automation, Jiangnan University, 214122 Wuxi, China
| | - Pan Li
- State Key Laboratory of Robotics, Shenyang Institute of Automation, Chinese Academy of Sciences, 110016 Shenyang, China
- University of Chinese Academy of Sciences, 100049 Beijing, China
| | - Yangdong Wen
- State Key Laboratory of Robotics, Shenyang Institute of Automation, Chinese Academy of Sciences, 110016 Shenyang, China
| | | | - Yuechao Wang
- State Key Laboratory of Robotics, Shenyang Institute of Automation, Chinese Academy of Sciences, 110016 Shenyang, China
| | - Gwo-Bin Lee
- Department of Power Mechanical Engineering, National Tsing Hua University, 30013 Hsinchu, Taiwan
| | - Wen Jung Li
- State Key Laboratory of Robotics, Shenyang Institute of Automation, Chinese Academy of Sciences, 110016 Shenyang, China
- Shenzhen Academy of Robotics, 518057 Shenzhen, China
- Department of Mechanical and Biomedical Engineering, , City University of Hong Kong, Kowloon Tong, Hong Kong China
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Gi HJ, Han D, Park JK. Optoelectrofluidic printing system for fabricating hydrogel sheets with on-demand patterned cells and microparticles. Biofabrication 2017; 9:015011. [PMID: 28092631 DOI: 10.1088/1758-5090/aa564c] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/13/2023]
Abstract
This paper presents a novel optoelectrofluidic printing system that facilitates not only the optoelectrofluidic patterning of microparticles and mammalian cells but also the harvesting of the patterned microparticles encapsulated within poly(ethylene glycol) dicarylate (PEGDA) hydrogel sheets. Although optoelectrofluidic technology has numerous advantages for programmable and on-demand patterning and the feasibility of manipulating single microparticles, practical applications using existing laboratory infrastructure in biological and clinical research fields have been strictly restricted due to the impossibility of recovering the final patterned product. In order to address these harvesting limitations, PEGDA was employed to utilize optoelectrofluidic printing. The Clausius-Mossotti factor was calculated to investigate the dielectrophoretic mobility of the microparticle and the cell in the PEGDA precursor solution. As a proof of concept, three basic controllabilities of the optoelectrofluidic printing system were characterized: the number of microparticles, the distance between the microparticle columns, and the ratio of two different microparticles. Furthermore, the optoelectrofluidic patterning and printing of human liver carcinoma cells (HepG2) were demonstrated in 5 min with a single-cell level of resolution. The appropriate ranges of frequency were experimentally defined based on the calculated result of the dielectrophoretic mobility of HepG2 cells. Finally, optoelectrofluidically cell-patterned hydrogel sheets were successfully recovered under a highly viable physiological condition.
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Affiliation(s)
- Hyun Ji Gi
- Department of Bio and Brain Engineering, Korea Advanced Institute of Science and Technology (KAIST), 291 Daehak-ro, Yuseong-gu, Daejeon 34141, Republic of Korea
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Han D, Park JK. Microarray-integrated optoelectrofluidic immunoassay system. BIOMICROFLUIDICS 2016; 10:034106. [PMID: 27190571 PMCID: PMC4866943 DOI: 10.1063/1.4950787] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/21/2016] [Accepted: 05/05/2016] [Indexed: 05/02/2023]
Abstract
A microarray-based analytical platform has been utilized as a powerful tool in biological assay fields. However, an analyte depletion problem due to the slow mass transport based on molecular diffusion causes low reaction efficiency, resulting in a limitation for practical applications. This paper presents a novel method to improve the efficiency of microarray-based immunoassay via an optically induced electrokinetic phenomenon by integrating an optoelectrofluidic device with a conventional glass slide-based microarray format. A sample droplet was loaded between the microarray slide and the optoelectrofluidic device on which a photoconductive layer was deposited. Under the application of an AC voltage, optically induced AC electroosmotic flows caused by a microarray-patterned light actively enhanced the mass transport of target molecules at the multiple assay spots of the microarray simultaneously, which reduced tedious reaction time from more than 30 min to 10 min. Based on this enhancing effect, a heterogeneous immunoassay with a tiny volume of sample (5 μl) was successfully performed in the microarray-integrated optoelectrofluidic system using immunoglobulin G (IgG) and anti-IgG, resulting in improved efficiency compared to the static environment. Furthermore, the application of multiplex assays was also demonstrated by multiple protein detection.
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Affiliation(s)
- Dongsik Han
- Department of Bio and Brain Engineering, Korea Advanced Institute of Science and Technology (KAIST) , 291 Daehak-ro, Yuseong-gu, Daejeon 34141, Republic of Korea
| | - Je-Kyun Park
- Department of Bio and Brain Engineering, Korea Advanced Institute of Science and Technology (KAIST) , 291 Daehak-ro, Yuseong-gu, Daejeon 34141, Republic of Korea
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Han D, Park JK. Optoelectrofluidic enhanced immunoreaction based on optically-induced dynamic AC electroosmosis. LAB ON A CHIP 2016; 16:1189-96. [PMID: 26926571 DOI: 10.1039/c6lc00110f] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/04/2023]
Abstract
We report a novel optoelectrofluidic immunoreaction system based on electroosmotic flow for enhancing antibody-analyte binding efficiency on a surface-based sensing system. Two conventional indium tin oxide glass slides are assembled to provide a reaction chamber for a tiny volume of sample droplet (∼5 μL), in which the top layer is employed as an antibody-immobilized substrate and the bottom layer acts as a photoconductive layer of an optoelectrofluidic device. Under the application of an AC voltage, an illuminated light pattern on the photoconductive layer causes strong counter-rotating vortices to transport analytes from the bulk solution to the vicinity of the assay spot on the glass substrate. This configuration overcomes the slow immunoreaction problem of a diffusion-based sensing system, resulting in the enhancement of binding efficiency via an optoelectrofluidic method. Furthermore, we investigate the effect of optically-induced dynamic AC electroosmotic flow on optoelectrofluidic enhancement for surface-based immunoreaction with a mathematical simulation study and real experiments using immunoglobulin G (IgG) and anti-IgG. As a result, dynamic light patterns provided better immunoreaction efficiency than static light patterns due to effective mass transport of the target analyte, resulting in an achievement of 2.18-fold enhancement under a growing circular light pattern compared to the passive mode.
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Affiliation(s)
- Dongsik Han
- Department of Bio and Brain Engineering, Korea Advanced Institute of Science and Technology (KAIST), 291 Daehak-ro, Yuseong-gu, Daejeon 34141, Republic of Korea.
| | - Je-Kyun Park
- Department of Bio and Brain Engineering, Korea Advanced Institute of Science and Technology (KAIST), 291 Daehak-ro, Yuseong-gu, Daejeon 34141, Republic of Korea.
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Park JK, Han D. WITHDRAWN: Optoelectrofluidic enhanced immunoassay system for carcinoembryonic antigen based on optically-induced electrothermal flow. Biosens Bioelectron 2015. [DOI: 10.1016/j.bios.2015.09.018] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/25/2022]
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Miyazako H, Mabuchi K, Hoshino T. Spatiotemporal Control of Electrokinetic Transport in Nanofluidics Using an Inverted Electron-Beam Lithography System. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2015; 31:6595-6603. [PMID: 25996098 DOI: 10.1021/acs.langmuir.5b00806] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/04/2023]
Abstract
Manipulation techniques of biomolecules have been proposed for biochemical analysis which combine electrokinetic dynamics, such as electrophoresis or electroosmotic flow, with optical manipulation to provide high throughput and high spatial degrees of freedom. However, there are still challenging problems in nanoscale manipulation due to the diffraction limit of optics. We propose here a new manipulation technique for spatiotemporal control of chemical transport in nanofluids using an inverted electron-beam (EB) lithography system for liquid samples. By irradiating a 2.5 keV EB to a liquid sample through a 100-nm-thick SiN membrane, negative charges can be generated within the SiN membrane, and these negative charges can induce a highly focused electric field in the liquid sample. We showed that the EB-induced negative charges could induce fluid flow, which was strong enough to manipulate 240 nm nanoparticles in water, and we verified that the main dynamics of this EB-induced fluid flow was electroosmosis caused by changing the zeta potential of the SiN membrane surface. Moreover, we demonstrated manipulation of a single nanoparticle and concentration patterning of nanoparticles by scanning EB. Considering the shortness of the EB wavelength and Debye length in buffer solutions, we expect that our manipulation technique will be applied to nanomanipulation of biomolecules in biochemical analysis and control.
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Affiliation(s)
- Hiroki Miyazako
- †Department of Information Physics and Computing, Graduate School of Information Science and Technology, and ‡Research Fellow of the Japan Society for the Promotion of Science, The University of Tokyo, 7-3-1 Hongo, Bunkyo-ku, Tokyo 113-8656, Japan
| | - Kunihiko Mabuchi
- †Department of Information Physics and Computing, Graduate School of Information Science and Technology, and ‡Research Fellow of the Japan Society for the Promotion of Science, The University of Tokyo, 7-3-1 Hongo, Bunkyo-ku, Tokyo 113-8656, Japan
| | - Takayuki Hoshino
- †Department of Information Physics and Computing, Graduate School of Information Science and Technology, and ‡Research Fellow of the Japan Society for the Promotion of Science, The University of Tokyo, 7-3-1 Hongo, Bunkyo-ku, Tokyo 113-8656, Japan
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Lee H, Xu L, Koh D, Nyayapathi N, Oh KW. Various on-chip sensors with microfluidics for biological applications. SENSORS 2014; 14:17008-36. [PMID: 25222033 PMCID: PMC4208211 DOI: 10.3390/s140917008] [Citation(s) in RCA: 27] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 07/15/2014] [Revised: 08/29/2014] [Accepted: 09/10/2014] [Indexed: 12/29/2022]
Abstract
In this paper, we review recent advances in on-chip sensors integrated with microfluidics for biological applications. Since the 1990s, much research has concentrated on developing a sensing system using optical phenomena such as surface plasmon resonance (SPR) and surface-enhanced Raman scattering (SERS) to improve the sensitivity of the device. The sensing performance can be significantly enhanced with the use of microfluidic chips to provide effective liquid manipulation and greater flexibility. We describe an optical image sensor with a simpler platform for better performance over a larger field of view (FOV) and greater depth of field (DOF). As a new trend, we review consumer electronics such as smart phones, tablets, Google glasses, etc. which are being incorporated in point-of-care (POC) testing systems. In addition, we discuss in detail the current optical sensing system integrated with a microfluidic chip.
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Affiliation(s)
- Hun Lee
- Department of Electrical Engineering, University at Buffalo, State University of New York (SUNY at Buffalo), Buffalo, NY 14260, USA.
| | - Linfeng Xu
- Department of Electrical Engineering, University at Buffalo, State University of New York (SUNY at Buffalo), Buffalo, NY 14260, USA.
| | - Domin Koh
- Department of Electrical Engineering, University at Buffalo, State University of New York (SUNY at Buffalo), Buffalo, NY 14260, USA.
| | - Nikhila Nyayapathi
- Department of Electrical Engineering, University at Buffalo, State University of New York (SUNY at Buffalo), Buffalo, NY 14260, USA.
| | - Kwang W Oh
- Department of Electrical Engineering, University at Buffalo, State University of New York (SUNY at Buffalo), Buffalo, NY 14260, USA.
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Mishra A, Kwon JS, Thakur R, Wereley S. Optoelectrical microfluidics as a promising tool in biology. Trends Biotechnol 2014; 32:414-21. [DOI: 10.1016/j.tibtech.2014.06.002] [Citation(s) in RCA: 18] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/16/2013] [Revised: 05/29/2014] [Accepted: 06/02/2014] [Indexed: 01/29/2023]
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Optical Spectrum and Electric Field Waveform Dependent Optically-Induced Dielectrophoretic (ODEP) Micro-Manipulation. MICROMACHINES 2012. [DOI: 10.3390/mi3020492] [Citation(s) in RCA: 36] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
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Hwang H, Han D, Oh YJ, Cho YK, Jeong KH, Park JK. In situ dynamic measurements of the enhanced SERS signal using an optoelectrofluidic SERS platform. LAB ON A CHIP 2011; 11:2518-25. [PMID: 21674105 DOI: 10.1039/c1lc20277d] [Citation(s) in RCA: 31] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/08/2023]
Abstract
A novel active surface-enhanced Raman scattering (SERS) platform for dynamic on-demand generation of SERS active sites based on optoelectrofluidics is presented in this paper. When a laser source is projected into a sample solution containing metal nanoparticles in an optoelectrofluidic device and an alternating current (ac) electric field is applied, the metal nanoparticles are spontaneously concentrated and assembled within the laser spot, form SERS-active sites, and enhance the Raman signal significantly, allowing dynamic and more sensitive SERS detection. In this simple platform, in which a glass slide-like optoelectrofluidic device is integrated into a conventional SERS detection system, both dynamic concentration of metal nanoparticles and in situ detection of SERS signal are simultaneously possible with only a single laser source. This optoelectrofluidic SERS spectroscopy allows on-demand generation of 'hot spots' at specific regions of interest, and highly sensitive, reliable, and stable SERS measurements of the target molecules in a tiny volume (∼500 nL) of liquid sample without any fluidic components and complicated systems.
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Affiliation(s)
- Hyundoo Hwang
- Department of Bio and Brain Engineering, Korea Advanced Institute of Science and Technology (KAIST), 291 Daehak-ro, Yuseong-gu, Daejeon 305-701, Republic of Korea
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Oh YJ, Park SG, Kang MH, Choi JH, Nam Y, Jeong KH. Beyond the SERS: Raman enhancement of small molecules using nanofluidic channels with localized surface plasmon resonance. SMALL (WEINHEIM AN DER BERGSTRASSE, GERMANY) 2011; 7:184-188. [PMID: 21213378 DOI: 10.1002/smll.201001366] [Citation(s) in RCA: 20] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/07/2010] [Revised: 08/27/2010] [Indexed: 05/26/2023]
Affiliation(s)
- Young-Jae Oh
- Department of Bio and Brain Engineering, KAIST, Guseong-dong, Yuseong-gu, Daejeon 305-701, Korea
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Abstract
Extraordinary advances in lab on a chip systems have been made on the basis of the development of micro/nanofluidics and its fusion with other technologies based on electrokinetics and optics. Optoelectrofluidic technology, which has been recently introduced as a new manipulation scheme, allows programmable manipulation of particles or fluids in microenvironments based on optically induced electrokinetics. Herein, the behaviour of particles or fluids can be controlled by inducing or perturbing electric fields on demand in an optical manner, which includes photochemical, photoconductive, and photothermal effects. This elegant scheme of the optoelectrofluidic platform has attracted attention in various fields of science and engineering. A lot of research on optoelectrofluidic manipulation technologies has been reported and the field has advanced rapidly, although some technical hurdles still remain. This review describes recent developments and future perspectives of optoelectrofluidic platforms for chemical and biological applications.
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Affiliation(s)
- Hyundoo Hwang
- Department of Bio and Brain Engineering, Korea Advanced Institute of Science and Technology, 335 Gwahangno, Yuseong-gu, Daejeon 305-701, Republic of Korea
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Hwang H, Chon H, Choo J, Park JK. Optoelectrofluidic Sandwich Immunoassays for Detection of Human Tumor Marker Using Surface-Enhanced Raman Scattering. Anal Chem 2010; 82:7603-10. [DOI: 10.1021/ac101325t] [Citation(s) in RCA: 56] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
- Hyundoo Hwang
- Department of Bio and Brain Engineering, Korea Advanced Institute of Science and Technology (KAIST), 335 Gwahangno, Yuseong-gu, Daejeon 305-701, Republic of Korea, Department of Bionano Engineering, Hanyang University, 1271 Sa-1-dong, Sangnok-gu, Ansan, Kyeonggi-do 426-791, Republic of Korea, and KAIST Institute for the NanoCentury, 335 Gwahangno, Yuseong-gu, Daejeon 305-701, Republic of Korea
| | - Hyangah Chon
- Department of Bio and Brain Engineering, Korea Advanced Institute of Science and Technology (KAIST), 335 Gwahangno, Yuseong-gu, Daejeon 305-701, Republic of Korea, Department of Bionano Engineering, Hanyang University, 1271 Sa-1-dong, Sangnok-gu, Ansan, Kyeonggi-do 426-791, Republic of Korea, and KAIST Institute for the NanoCentury, 335 Gwahangno, Yuseong-gu, Daejeon 305-701, Republic of Korea
| | - Jaebum Choo
- Department of Bio and Brain Engineering, Korea Advanced Institute of Science and Technology (KAIST), 335 Gwahangno, Yuseong-gu, Daejeon 305-701, Republic of Korea, Department of Bionano Engineering, Hanyang University, 1271 Sa-1-dong, Sangnok-gu, Ansan, Kyeonggi-do 426-791, Republic of Korea, and KAIST Institute for the NanoCentury, 335 Gwahangno, Yuseong-gu, Daejeon 305-701, Republic of Korea
| | - Je-Kyun Park
- Department of Bio and Brain Engineering, Korea Advanced Institute of Science and Technology (KAIST), 335 Gwahangno, Yuseong-gu, Daejeon 305-701, Republic of Korea, Department of Bionano Engineering, Hanyang University, 1271 Sa-1-dong, Sangnok-gu, Ansan, Kyeonggi-do 426-791, Republic of Korea, and KAIST Institute for the NanoCentury, 335 Gwahangno, Yuseong-gu, Daejeon 305-701, Republic of Korea
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Hwang H, Park JK. Measurement of molecular diffusion based on optoelectrofluidic fluorescence microscopy. Anal Chem 2010; 81:9163-7. [PMID: 19821583 DOI: 10.1021/ac9021709] [Citation(s) in RCA: 19] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
This technical note reports a method for measuring the diffusion coefficient of molecules based on an optoelectrofluidic platform. Optoelectrofluidic fluorescence microscopy, which is constructed with an optoelectrofluidic device and a conventional fluorescence microscope, is a useful tool for controlling and detecting local molecular concentration in a fluid with a single light source. When we project a light for fluorescence excitation and apply an ac signal of a few hundred Hertz frequency around 100 Hz to the optoelectrofluidic device, a sudden decay of molecular concentration occurs within the illuminated area due to several mechanisms, including optically induced ac electroosmosis, electrostatic interaction forces among the polarized molecules, and interactions among the molecules and between the molecules and the electric double layer. After the applied voltage was turned off, the dispersed molecules diffuse into the molecular depletion area and the fluorescence signal is recovered. On the basis of these phenomena, we successfully measured the diffusion coefficient of various dextran molecules. A statistical analysis to determine the significance of our experimental values compared to the previously reported values measured using fluorescence recovery after photobleaching technology was also performed. This new technique demonstrates the first analytical measurement of diffusion based on the optoelectrofluidic platform and can be a useful tool for measuring the mobility of molecules in a simple and easy way.
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Affiliation(s)
- Hyundoo Hwang
- Department of Bio and Brain Engineering, College of Life Science and Bioengineering, KAIST, 335 Gwanhangno, Yuseong-gu, Daejeon 305-701, Republic of Korea
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