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Trends in advanced materials for the fabrication of insulin electrochemical immunosensors. CHEMICAL PAPERS 2022. [DOI: 10.1007/s11696-022-02416-5] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/25/2022]
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Applications of magnetic materials in the fabrication of microfluidic-based sensing systems: Recent advances. Microchem J 2022. [DOI: 10.1016/j.microc.2021.107042] [Citation(s) in RCA: 9] [Impact Index Per Article: 4.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/11/2022]
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Huang K, Geng Y, Zhang X, Chen D, Cai Z, Wang M, Zhu Z, Wang Z. A Wide-Band Digital Lock-In Amplifier and Its Application in Microfluidic Impedance Measurement. SENSORS 2019; 19:s19163519. [PMID: 31405249 PMCID: PMC6719078 DOI: 10.3390/s19163519] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 06/16/2019] [Revised: 08/06/2019] [Accepted: 08/07/2019] [Indexed: 11/22/2022]
Abstract
In this work, we report on the design of a wide-band digital lock-in amplifier (DLIA) of up to 65 MHz and its application for electrical impedance measurements in microfluidic devices. The DLIA is comprised of several dedicated technologies. First, it features a fully differential analog circuit, which includes a preamplifier with a low input noise of 4.4 nV/√Hz, a programmable-gain amplifier with a gain of 52 dB, and an anti-aliasing, fully differential low-pass filter with −76 dB stop-band attenuation. Second, the DLIA has an all-digital phase lock loop, which features a phase deviation of less than 0.02° throughout the frequency range. The phase lock loop utilizes an equally accurate period-frequency measurement, with a sub-ppm precision of frequency detection. Third, a modified clock link is implemented in the DLIA to improve the signal-to-noise ratio of the analog-to-digital converter affected by clock jitter of up to 20 dBc. A series of measurements were performed to characterize the DLIA, and the results showed an accurate performance. Additionally, impedance measurements of standard-size microparticles were performed by frequency sweep from 300 kHz to 30 MHz, using the DLIA in a microfluidic device. Different diameters of microparticle could be accurately distinguished according to the relative impedance at 2.5 MHz. The results confirm the promising applications of the DLIA in microfluidic electrical impedance measurements.
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Affiliation(s)
- Kan Huang
- School of Electronics and Information Technology, Sun Yat-Sen University, Xingang Xi Road 135, Guangzhou 510275, China
| | - Yangye Geng
- Key Laboratory of MEMS of Ministry of Education, School of Electronic Science and Engineering, Southeast University, Sipailou 2, Nanjing 210096, China
| | - Xibin Zhang
- School of Electronics and Information Technology, Sun Yat-Sen University, Xingang Xi Road 135, Guangzhou 510275, China
| | - Dihu Chen
- School of Electronics and Information Technology, Sun Yat-Sen University, Xingang Xi Road 135, Guangzhou 510275, China
| | - Zhigang Cai
- School of Electronics and Information Technology, Sun Yat-Sen University, Xingang Xi Road 135, Guangzhou 510275, China
| | - Min Wang
- Guangzhou Institute of Geochemistry, Chinese Academy of Sciences, Kehua Street 511, Guangzhou 510640, China
| | - Zhen Zhu
- Key Laboratory of MEMS of Ministry of Education, School of Electronic Science and Engineering, Southeast University, Sipailou 2, Nanjing 210096, China.
| | - Zixin Wang
- School of Electronics and Information Technology, Sun Yat-Sen University, Xingang Xi Road 135, Guangzhou 510275, China.
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Huong Giang DT, Dang DX, Toan NX, Tuan NV, Phung AT, Duc NH. Distance magnetic nanoparticle detection using a magnetoelectric sensor for clinical interventions. THE REVIEW OF SCIENTIFIC INSTRUMENTS 2017; 88:015004. [PMID: 28147672 DOI: 10.1063/1.4973729] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/06/2023]
Abstract
Distance magnetic nanoparticle detections were investigated by using a magnetoelectric based magnetic sensor with a long type bilayer Metglas/PZT laminate composite. In homogeneous magnetic fields, the sensor exhibits a sensitivity of 307.4 mV/Oe, which is possible for a detection limit of 2.7 × 10-7 emu. This sensor can detect an amount of 0.31 μg of the superparamagnetic Fe3O4-chitosan fluid at 2 mm height above the sensor surface. To detect a spot with magnetic nanoparticles at a distance of about 7.6 mm, it should contain at least 50 μg of iron oxide. This approach can develop the local detection of magnetic nanoparticles at a depth of centimeters in the body during clinical interventions.
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Affiliation(s)
- D T Huong Giang
- Laboratory for Micro-Nano Technologies and Faculty of Engineering Physics and Nanotechnology, VNU University of Engineering and Technology, Vietnam National University, Hanoi, 144 Xuan Thuy Road, Cau Giay, Hanoi, Vietnam
| | - D X Dang
- Laboratory for Micro-Nano Technologies and Faculty of Engineering Physics and Nanotechnology, VNU University of Engineering and Technology, Vietnam National University, Hanoi, 144 Xuan Thuy Road, Cau Giay, Hanoi, Vietnam
| | - N X Toan
- Laboratory for Micro-Nano Technologies and Faculty of Engineering Physics and Nanotechnology, VNU University of Engineering and Technology, Vietnam National University, Hanoi, 144 Xuan Thuy Road, Cau Giay, Hanoi, Vietnam
| | - N V Tuan
- Department of Physics, Le Quy Don University, 236 Hoang Quoc Viet Road, Cau Giay, Hanoi, Vietnam
| | - A T Phung
- Departement of Electrical and Electronic Equipment, School of Electrical Engineering, Hanoi University of Science and Technology, Suite 106, C3 Building, 1 Dai Co Viet Road, Hanoi, Vietnam
| | - N H Duc
- Laboratory for Micro-Nano Technologies and Faculty of Engineering Physics and Nanotechnology, VNU University of Engineering and Technology, Vietnam National University, Hanoi, 144 Xuan Thuy Road, Cau Giay, Hanoi, Vietnam
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Ruffert C. Magnetic Bead-Magic Bullet. MICROMACHINES 2016; 7:E21. [PMID: 30407394 PMCID: PMC6189928 DOI: 10.3390/mi7020021] [Citation(s) in RCA: 31] [Impact Index Per Article: 3.9] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 11/23/2015] [Revised: 01/17/2016] [Accepted: 01/18/2016] [Indexed: 11/16/2022]
Abstract
Microfluidics is assumed to be one of the leading and most promising areas of research since the early 1990s. In microfluidic systems, small spherical magnetic particles with superparamagnetic properties, called magnetic beads, play an important role in the design of innovative methods and tools, especially in bioanalysis and medical sciences. The intention of this review paper is to address main aspects from the state-of-the-art in the area of magnetic bead research, while demonstrating the broad variety of applications and the huge potential to solve fundamental biological and medical problems in the fields of diagnostics and therapy. Basic issues and demands related to the fabrication of magnetic particles and physical properties of nanosize magnets are discussed in Section 2. Of main interest are the control and adjustment of the nanoparticles' properties and the availability of adequate approaches for particle detection via their magnetic field. Section 3 presents an overview of magnetic bead applications in nanomedicine. In Section 4, practical aspects of sample manipulation and separation employing magnetic beads are described. Finally, the benefits related to the use of magnetic bead-based microfluidic systems are summarized, illustrating ongoing questions and open tasks to be solved on the way to an approaching microfluidic age.
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Affiliation(s)
- Christine Ruffert
- Center for Production Technology, Leibniz Universitaet Hannover, An der Universitaet 2, D-30823 Garbsen, Germany.
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