Selective detection of elemental mercury vapor using a surface acoustic wave (SAW) sensor

The Analyst ◽  
2015 ◽  
Vol 140 (16) ◽  
pp. 5508-5517 ◽  
Author(s):  
K. M. Mohibul Kabir ◽  
Ylias M. Sabri ◽  
Glenn I. Matthews ◽  
Lathe A. Jones ◽  
Samuel J. Ippolito ◽  
...  
Keyword(s):  
Acoustic Wave ◽  
Surface Acoustic Wave ◽  
Elemental Mercury ◽  
Mercury Vapor ◽  
Selective Detection ◽  
Experimental Demonstration ◽  
Saw Sensor ◽  
Highly Sensitive ◽  
Elemental Mercury Vapor

Theoretical and experimental demonstration that the developed SAW based sensor is highly sensitive and selective toward mercury vapor.

Highly sensitive thick diaphragm-based surface acoustic wave pressure sensor

2021 ◽  
pp. 112935
Author(s):  
Maria Muzamil Memon ◽  
Shuliang Pan ◽  
Jiang Wan ◽  
Tao Wang ◽  
Wanli Zhang
Keyword(s):  
Acoustic Wave ◽  
Surface Acoustic Wave ◽  
Pressure Sensor ◽  
Wave Pressure ◽  
Highly Sensitive

A high sensitivity wireless mass-loading surface acoustic wave DNA biosensor

2014 ◽  
Vol 28 (07) ◽  
pp. 1450056 ◽  
Author(s):  
Hua-Lin Cai ◽  
Yi Yang ◽  
Yi-Han Zhang ◽  
Chang-Jian Zhou ◽  
Cang-Ran Guo ◽  
...  
Keyword(s):  
Acoustic Wave ◽  
Surface Acoustic Wave ◽  
Dna Sequences ◽  
Biological Treatment ◽  
High Performance ◽  
Processing System ◽  
High Sensitivity ◽  
Treatment Method ◽  
Saw Sensor ◽  
Target Dna

In this paper, a surface acoustic wave (SAW) biosensor with gold delay area on LiNbO 3 substrate detecting DNA sequences is proposed. By well-designed device parameters of the SAW sensor, it achieves a high performance for highly sensitive detection of target DNA. In addition, an effective biological treatment method for DNA immobilization and abundant experimental verification of the sensing effect have made it a reliable device in DNA detection. The loading mass of the probe and target DNA sequences is obtained from the frequency shifts, which are big enough in this work due to an effective biological treatment. The experimental results show that the biosensor has a high sensitivity of 1.2 pg/ml/Hz and high selectivity characteristic is also verified by the few responses of other substances. In combination with wireless transceiver, we develop a wireless receiving and processing system that can directly display the detection results.

Development of ball surface acoustic wave gas chromatograph for environmental monitoring in spacecraft and its application on the ground

2022 ◽  
Author(s):  
Takamitsu Iwaya ◽  
Shingo Akao ◽  
Kazushi Yamanaka ◽  
Tatsuhiro Okano ◽  
Nobuo Takeda ◽  
...  
Keyword(s):  
Acoustic Wave ◽  
Surface Acoustic Wave ◽  
Stationary Phases ◽  
Micro Electro Mechanical System ◽  
Steel Plates ◽  
Gas Chromatograph ◽  
Site Analysis ◽  
Saw Sensor ◽  
Ball Surface ◽  
Brewing Process

Abstract For on-site analysis of surface materials on the moon, planets, and small bodies and for the monitoring of air quality in crewed spacecraft, we have developed a portable gas chromatograph (GC) equipped with a ball surface acoustic wave (SAW) sensor. In this study, we fabricated a 10 cm cube GC that implements the forward flush method using two metal micro-electro-mechanical-system (MEMS) columns coated with different stationary phases in microchannels fabricated by wet etching and diffusion bonding of stainless-steel plates. Using this GC, we succeeded in analyzing 10 kinds of gas within 10 min. In addition, for the application of the ball SAW GC on the ground, we also developed a palm-sized GC with a single metal capillary column and used it in the analysis of the headspace gas of sake. We showed that the ratio of peak areas differed among odorants depending on the brand and brewing process of sake.

scholarly journals Emission-dominated gas exchange of elemental mercury vapor over natural surfaces in China

2016 ◽  
Author(s):  
Xun Wang ◽  
Che-Jen Lin ◽  
Wei Yuan ◽  
Jonas Sommar ◽  
Wei Zhu ◽  
...  
Keyword(s):  
Forest Ecosystems ◽  
Agricultural Land ◽  
Mechanistic Model ◽  
Mainland China ◽  
Elemental Mercury ◽  
Mercury Vapor ◽  
Model Verification ◽  
Surface Exchange ◽  
Field Shift ◽  
Elemental Mercury Vapor

Abstract. Mercury (Hg) emission from natural surfaces plays an important role in global Hg cycling. The present estimate of global natural emission has large uncertainty and remains unverified against field data, particularly for terrestrial surfaces. In this study, a mechanistic model is developed for estimating the emission of elemental mercury vapor (Hg0) from natural surfaces in China. The development implements recent advancements in the understanding of air-soil and air-foliage exchange of Hg0 and redox chemistry in soil and on surfaces, incorporates the effects of soil characteristics and landuse changes by agricultural activities, and is examined through a systematic set of sensitivity simulations. Using meteorology simulated by the Weather Research and Forecasting Model (WRF version 3.7), the exchange of Hg0 between the atmosphere and natural surfaces in Mainland China is estimated to be 465.1 Mg yr−1, including 565.5 Mg yr−1 of emission from soils, 9.0 Mg yr−1 of emission from water body, and 100.4 Mg yr−1 uptake by vegetation. The air-surface exchange is strongly dependent on the landuse and meteorology, with 9 % of net emission from forest ecosystems, 50 % from shrubland, and savanna and grassland, 33 % from cropland, and 8 % from other landuses. Given the large agricultural land area in China, farming activities play an important role on the air-surface exchange in farmland. Particularly, rice field shift from a net sink (3.3 Mg uptake) during April to October (rice planting) to a net source when the farmland is not flooded (November-March). Summing up emissions from each landuse, more than half of the total emission occurs in summer (51 %), followed by spring (28 %), autumn (13 %) and winter (8 %). Model verification is accomplished using observational data of air-soil/air-water fluxes and Hg deposition through litterfall for forest ecosystems in China and Monte Carlo simulations. In contrast to the earlier estimate by Shetty et al. (2008) that reported large emission from vegetative surfaces using an evapotranspiration approach, the estimate in this study shows natural emissions are primarily from grassland and dry cropland. Such an emission pattern may alter the current understanding of Hg emission outflow from China as reported by Lin et al. (2010b) because of a substantial natural Hg emission occurs in West China.

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