A Virtual Impactor for Hydrodynamic Particle Classification

Kim, Y.H.; Park, Suyoung; Lim, Mijin; Hwang, Jungho; Shin, Jae Seung; Kim, Y.J.

doi:10.1109/sensor.2007.4300612

Cited by 5 publications

(5 citation statements)

References 10 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Other micromachined VIs were also reported. Kim et al [22] fabricated such a micro-VI using bulk micromachining, with an injection nozzle 156 μm wide and a channel more than 200 μm deep whose design cut-off particle diameter was initially set as 10 μm. However, this was a passive hydrodynamic particle sorter for classifying biochemical components in liquid media, not for airborne particles.…”

Section: Particle Separation Methodsmentioning

confidence: 99%

“…For particles with a diameter of 10 μm (for which the collection efficiency should be 50%) the measured collection efficiency was 68%. The authors attributed this discrepancy to the fact that the actual particle diameters were larger than 10 μm [22].…”

Section: Particle Separation Methodsmentioning

confidence: 99%

“…A similar MEMS microsystem for PM 2.5 measurement also comprised a VI for particle separation, a TP for particle capture and a FBAR as the particle detector, plus the necessary electronic circuits [22]. The final system was made up of 3 wafers: a bottom quartz wafer contained the FBAR and CMOS dies mounted on it a priori , the middle Si wafer comprised the microfluidics with inlet/outlet, and a top fused quartz wafer that served as a transparent cap for the air-microfluidic channels, as well as substrate for the thermophoretic heaters.…”

Section: Particle Detectors and Their Performance Characteristicsmentioning

confidence: 99%

“…The experimental results have shown that the prototype had a maximum theoretical detection limit of approximately 2 μg/m 3 with a 10 min. integration time [22].…”

Section: Particle Detectors and Their Performance Characteristicsmentioning

confidence: 99%

See 3 more Smart Citations

Microfluidic and Micromachined/MEMS Devices for Separation, Discrimination and Detection of Airborne Particles for Pollution Monitoring

Poenar

2019

Micromachines

View full text Add to dashboard Cite

Most of the microfluidics-related literature describes devices handling liquids, with only a small part dealing with gas-based applications, and a much smaller number of papers are devoted to the separation and/or detection of airborne inorganic particles. This review is dedicated to this rather less known field which has become increasingly important in the last years due to the growing attention devoted to pollution monitoring and air quality assessment. After a brief introduction summarizing the main particulate matter (PM) classes and the need for their study, the paper reviews miniaturized devices and/or systems for separation, detection and quantitative assessment of PM concentration in air with portable and easy-to-use platforms. The PM separation methods are described first, followed by the key detection methods, namely optical (scattering) and electrical. The most important miniaturized reported realizations are analyzed, with special attention given to microfluidic and micromachined or micro-electro-mechanical systems (MEMS) chip-based implementations due to their inherent capability of being integrated in lab-on-chip (LOC) type of smart microsystems with increased functionalities that can be portable and are easy to use. The operating principles and (when available) key performance parameters of such devices are presented and compared, also highlighting their advantages and disadvantages. Finally, the most relevant conclusions are discussed in the last section.

show abstract

Section: Particle Separation Methodsmentioning

confidence: 99%

Section: Particle Separation Methodsmentioning

confidence: 99%

Section: Particle Detectors and Their Performance Characteristicsmentioning

confidence: 99%

“…The experimental results have shown that the prototype had a maximum theoretical detection limit of approximately 2 μg/m 3 with a 10 min. integration time [22].…”

Section: Particle Detectors and Their Performance Characteristicsmentioning

confidence: 99%

See 2 more Smart Citations

Microfluidic and Micromachined/MEMS Devices for Separation, Discrimination and Detection of Airborne Particles for Pollution Monitoring

Poenar

2019

Micromachines

View full text Add to dashboard Cite

show abstract

“…Stk50 is adopted as a design rule, for which the Stokes number collection efficiency is 50%. The value 0.23 is recommended for square channels [27]. The virtual impactor was designed based on a trial-anderror process using the following procedure: (1) determination of the target cut-off diameter (d p ), flow velocity (U), channel thickness (t) and Stokes number; (2) calculation of W using equations (3)-( 5) and (3) verification of Re to determine if the resulting flow is within the laminar regime (<1000), using equation ( 6):…”

Section: Design Of the Virtual Impactormentioning

confidence: 99%

Hybrid cell sorters for on-chip cell separation by hydrodynamics and magnetophoresis

Seo

Kim

et al. 2010

J. Micromech. Microeng.

View full text Add to dashboard Cite

The classification of cells is important for medical diagnosis and medicine research. A micro-scale analysis system for blood allows immediate diagnosis, regardless of time or location. Rapid handling of biological cells is required for the development of lab-on-a-chip and point-of-care technologies. In previous papers, the reported sample solution flow rates for hydrodynamic cell separation ranged from 0.1 to tens of μl min −1 . This paper proposes a hybrid cell sorter that combines hydrodynamics and magnetophoresis. This cell sorter is proposed for improving the classification efficiency of a virtual impactor-based cell sorter and for permitting the hydrodynamic cell separation with high throughput. In addition, its performance has been evaluated in the classification of Jurkat cells and blood cells. In the Jurkat cell experiment, the classification efficiency of Jurkat cells at the major outlet decreased from 70 to 50.8% with the proposed hybrid scheme. The flow rate for cell separation was 1 ml min −1 . The classification efficiency of red blood cells (RBCs) increased from 75.2 to 86.8% with the application of a magnetic field. Also, the classification efficiency of white blood cells (WBCs) decreased from 83.8 to 70.9% with an applied magnetic field. Experimental results demonstrated that the classification efficiency of blood cells can be modulated and enhanced by magnetophoresis and that the hybrid cell sorter has potential for lab-on-a-chip applications.

show abstract