Surface acoustic wave controlled integrated band-pass filter

Skowronek, Viktor; Rambach, Richard W.; Franke, Thomas

doi:10.1007/s10404-015-1559-3

Cited by 33 publications

(26 citation statements)

References 27 publications

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“…To achieve this goal, various types of ammonia sensors, such as metal oxide semiconductor sensors, electrochemical sensors and surface acoustic wave (SAW) sensors were developed, [13][14][15][16][17]. Benefiting from the significant development of RF and crystal technologies, surface acoustic wave techniques (SAWTs) are playing important roles in our daily life [18][19][20][21].…”

Section: Introductionmentioning

confidence: 99%

NH3 sensing property and mechanisms of quartz surface acoustic wave sensors deposited with SiO2, TiO2, and SiO2-TiO2 composite films

Tang

et al. 2018

Sensors and Actuators B: Chemical

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Northumbria University has developed Northumbria Research Link (NRL) to enable users to access the University's research output. Copyright © and moral rights for items on NRL are retained by the individual author(s) and/or other copyright owners. Single copies of full items can be reproduced, displayed or performed, and given to third parties in any format or medium for personal research or study, educational, or not-for-profit purposes without prior permission or charge, provided the authors, title and full bibliographic details are given, as well as a hyperlink and/or URL to the original metadata page. The content must not be changed in any way. Full items must not be sold commercially in any format or medium without formal permission of the copyright holder. The full policy is available online: http://nrl.northumbria.ac.uk/policies.html This document may differ from the final, published version of the research and has been made available online in accordance with publisher policies. To read and/or cite from the published version of the research, please visit the publisher's website (a subscription may be required.) This is a PDF file of an unedited manuscript that has been accepted for publication. As a service to our customers we are providing this early version of the manuscript. The manuscript will undergo copyediting, typesetting, and review of the resulting proof before it is published in its final form. Please note that during the production process errors may be discovered which could affect the content, and all legal disclaimers that apply to the journal pertain. and SiO2-TiO2 films showed positive frequency shifts, whereas SiO2 film exhibits a negative frequency shift to NH3 gas. it is believed that the negative frequency shift was mainly caused by the increase of NH3 mass loading on the sensitive film while the positive frequency shift was associated to the condensation of the hydroxyl groups (-OH) on the film making the film stiffer and lighter, when exposed to NH3 gas. It demonstrated that humidity played a significant factor on the sensing performance. Comparative studies exhibited that the sensor based on the composite SiO2-TiO2 film had a much better sensitivity to NH3 at a low concentration level (1 ppm) with a response of 2 KHz, and also showed fast response and recovery, excellent selectivity, stability and reproducibility. Accepted Manuscript

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Section: Introductionmentioning

confidence: 99%

NH3 sensing property and mechanisms of quartz surface acoustic wave sensors deposited with SiO2, TiO2, and SiO2-TiO2 composite films

Tang

et al. 2018

Sensors and Actuators B: Chemical

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“…[8][9][10][11] With the aid of SAWs, it is possible to produce droplets, move them along specified directions, and create conditions stimulating either droplet coalescence or droplet breakup. [12][13][14][15][16][17][18] If the SAW amplitude is high enough, then fluid atomization, i.e., aerosol generation, occurs. [19][20][21] Forces and flows induced in a fluid by SAWs separate cells, [22][23][24] align nanowires, and deagglomerate nanotubes.…”

Section: Introductionmentioning

confidence: 99%

Surface acoustic wave electric field effect on acoustic streaming: Numerical analysis

Darinskii

Weihnacht²,

Schmidt

2018

Journal of Applied Physics

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The paper numerically studies the contribution of the electric field accompanying the surface acoustic wave to the actuation of the acoustic streaming in microchannels. The finite element method is used. The results obtained as applied to the surface waves on 128° and 64°-rotated Y cuts of LiNbO3 demonstrate that the force created by the electric field is capable of accelerating appreciably the acoustic streaming. In particular, examples are given for the situations where the electric field increases the streaming velocity by a factor of about 2–3 and significantly changes the flow pattern as compared to predictions of computations ignoring the electric field.

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“…16,17 Many acoustic sorting methods achieve particle or cell separation by either travelling waves 37,38 or by generating a standing wave field inside the active area of the device. 9,39,40 The difference in time-of-flight of particles due to the acoustic-viscous force balance has been utilized for continuous sorting first by the group of Feke 41,42 for size-based separation, followed by compressibility-based sorting of particles. 43 Increasing the frequency of the field, transducer dimensions and therefore the device size can be reduced and successful sorting can be achieved in microfluidic devices.…”

Section: Introductionmentioning

confidence: 99%

Particle separation by phase modulated surface acoustic waves

et al. 2017

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High efficiency isolation of cells or particles from a heterogeneous mixture is a critical processing step in lab-on-a-chip devices. Acoustic techniques offer contactless and label-free manipulation, preserve viability of biological cells, and provide versatility as the applied electrical signal can be adapted to various scenarios. Conventional acoustic separation methods use time-of-flight and achieve separation up to distances of quarter wavelength with limited separation power due to slow gradients in the force. The method proposed here allows separation by half of the wavelength and can be extended by repeating the modulation pattern and can ensure maximum force acting on the particles. In this work, we propose an optimised phase modulation scheme for particle separation in a surface acoustic wave microfluidic device. An expression for the acoustic radiation force arising from the interaction between acoustic waves in the fluid was derived. We demonstrated, for the first time, that the expression of the acoustic radiation force differs in surface acoustic wave and bulk devices, due to the presence of a geometric scaling factor. Two phase modulation schemes are investigated theoretically and experimentally. Theoretical findings were experimentally validated for different mixtures of polystyrene particles confirming that the method offers high selectivity. A Monte-Carlo simulation enabled us to assess performance in real situations, including the effects of particle size variation and non-uniform acoustic field on sorting efficiency and purity, validating the ability to separate particles with high purity and high resolution.

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Surface acoustic wave controlled integrated band-pass filter

Cited by 33 publications

References 27 publications

NH3 sensing property and mechanisms of quartz surface acoustic wave sensors deposited with SiO2, TiO2, and SiO2-TiO2 composite films

NH3 sensing property and mechanisms of quartz surface acoustic wave sensors deposited with SiO2, TiO2, and SiO2-TiO2 composite films

Surface acoustic wave electric field effect on acoustic streaming: Numerical analysis

Particle separation by phase modulated surface acoustic waves

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