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Ultra-sensitive <i>in situ</i> detection of silver ions using a quartz crystal microbalance
Lee, Sangmyung,Jang, Kuewhan,Park, Chanho,You, Juneseok,Kim, Taegyu,Im, Chulhwan,Kang, Junoh,Shin, Haneul,Choi, Chang-Hwan,Park, Jinsung,Na, Sungsoo The Royal Society of Chemistry 2015 NEW JOURNAL OF CHEMISTRY Vol.39 No.10
<P>The detection of toxic nanomaterials is highly important, because their scientific and engineering applications have rapidly increased recently. Consequently, they can harmfully impact human health and the environment. Herein, we report a quartz crystal microbalance (QCM)-based, <I>in situ</I> and real-time detection of toxic silver ions by measuring a frequency shift. Generally, silver ions are so small that they are difficult to be identified using conventional microscopy. However, using QCM and a label-free silver-specific cytosine DNA, ultra-sensitive and <I>in situ</I> detection of silver ions is performed. The limit of detection (LOD) of this sensor platform is 100 pM, which is ten times lower than the previous study using a cantilever. It also detects silver ions rapidly in real time, which is completed within 10 min. Furthermore, our proposed detection method is able to detect silver ions in drinking water. The results suggest that QCM-based detection opens a new avenue for the development of a practical water testing sensor.</P> <P>Graphic Abstract</P><P>Label-free, ultra-sensitive and <I>in situ</I> detection of silver ion was achieved using a quartz crystal microbalance in laboratory conditions and drinking water. <IMG SRC='http://pubs.rsc.org/services/images/RSCpubs.ePlatform.Service.FreeContent.ImageService.svc/ImageService/image/GA?id=c5nj00668f'> </P>
Eojin Kim,Ji-Hyeon Yoo,Hee-Eun Kim,Hoonkyu Seo,Kwangsun Ryu,Jongdae Sohn,Junchan Lee,Jongho Seon,Ensang Lee,Dae-Young Lee,Kyoungwook Min,Kyung-In Kang,Sang-Yun Lee,Juneseok Kang 한국우주과학회 2020 Journal of Astronomy and Space Sciences Vol.37 No.3
This paper describes the initial operations and preliminary results of the Instrument for the study of Stable/Storm-time Space (ISSS) onboard the microsatellite Next Generation Small Satellite-1 (NEXTSat-1), which was launched on December 4, 2018 into a sun-synchronous orbit at an altitude of 575 km with an orbital inclination angle of 97.7°. The spacecraft and the instruments have been working normally, and the results from the observations are in agreement with those from other satellites. Nevertheless, improvement in both the spacecraft/instrument operation and the analysis is suggested to produce more fruitful scientific results from the satellite operations. It is expected that the ISSS observations will become the main mission of the NEXTSat-1 at the end of 2020, when the technological experiments and astronomical observations terminate after two years of operation.