Non-contact detecting solution ionic strength in microfluidic channel utilizing GHz complementary split-ring resonator (CSRR)

Cheng-Hua Li, Kuan-Wei Chen, Chia-Ming Hsu, Chin-Lung Yang, K. Hsieh, Che-Hsin Lin
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引用次数: 1

Abstract

This paper presents a novel microchip integrated with a GHz complementary split-ring resonator (CSRR) and a microfluidic channel for non-contact detecting the ionic strength of solutions. An upper C-ring resonator induced with an underneath linear micro-strip is used to generate the complementary resonance. The induced electromagnetic resonance is sensitive to surrounding material properties including complex permittivity and thickness of materials. The insertion loss of the GHz signal increases with the increasing material permittivity nearby the CSRR. Therefore, this technique is good to measure the ionic strength of solutions without using physical electrodes to contact the solutions. Results show that the developed CSRR chip is capable of detecting NaCl solutions of the concentration ranging in 10−3∼5.0 M with a sensitivity of 1.5 dB/M at high concentration range. The CSRR chip is also capable of distinguishing solutions of same concentration but different ionic charges. The developed CSRR chip has shown its potentials for remote monitoring the solution properties.
利用GHz互补裂环谐振器(CSRR)非接触检测微流控通道中溶液离子强度
本文提出了一种集成了GHz互补劈环谐振器(CSRR)和微流控通道的新型微芯片,用于非接触检测溶液的离子强度。利用下线性微带诱导的上c环谐振器产生互补谐振。感应电磁共振对周围材料的复介电常数和材料厚度等特性非常敏感。GHz信号的插入损耗随着CSRR附近材料介电常数的增大而增大。因此,该技术可以很好地测量溶液的离子强度,而无需使用物理电极与溶液接触。结果表明,所研制的CSRR芯片能够检测浓度为10−3 ~ 5.0 M的NaCl溶液,在高浓度范围内灵敏度为1.5 dB/M。CSRR芯片还能够区分相同浓度但不同离子电荷的溶液。所研制的CSRR芯片在远程监测溶液性质方面显示出了很大的潜力。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
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