Surface acoustic wave based analytical system for the detection of liquid detergents

Vivancos, José-Luis; Rácz, Zoltán; Cole, Marina; Gardner, Julian W.

doi:10.1016/j.snb.2012.05.014

Cited by 18 publications

(10 citation statements)

References 33 publications

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“…Suds investigations with surface acoustic wave (SAW) sensors have been tested successfully to detect single sufactant concentrations (Vivancos et al, 2012). The investigation of water parameters, surfactant mixtures and critical micelle concentration (CMC) are not shown.…”

Section: State Of the Art And New Approachesmentioning

confidence: 99%

“…Moreover χ E is frequencydependent and the results of the established methods which use only one frequency is incorrect. Suds investigations with surface acoustic wave (SAW) sensors have been tested successfully to detect single sufactant concentrations (Vivancos, 2012). The investigation of water parameters, surfactant mixtures and cmc are not shown.…”

Section: State Of the Art And New Approachesmentioning

confidence: 99%

See 1 more Smart Citation

Electrochemical analysis of water and suds by impedance spectroscopy and cyclic voltammetry

Gruden¹,

Buchholz²,

Kanoun

2014

J. Sens. Sens. Syst.

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Abstract. Optimum detergent dosage during a washing process depends on water quality, degree of pollution and quantity of laundry. Particularly, water quality is an important factor. Other parameters like carbonate-or non-carbonate hardness and calcium / magnesium (Ca / Mg) ratio in addition to total hardness of water have an impact on the amount of detergent. This work discusses the possibilities realizing a detergent sensor that measures important parameters for the washing process and assess the ideal necessary amount of detergent during the washing process. The approach is to combine impedance spectroscopy with cyclic voltammetry in order to determine both water quality and concentration of detergent in the suds which build up the basis for an optimum detergent dosage. The results of cyclic voltammetry show that it is possible to identify the Ca / Mg ratio and the carbonate hardness separately, which is necessary for the optimization of the washing process. Impedance measurements identify total hardness and detergent concentrations.

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Section: State Of the Art And New Approachesmentioning

confidence: 99%

Section: State Of the Art And New Approachesmentioning

confidence: 99%

Electrochemical analysis of water and suds by impedance spectroscopy and cyclic voltammetry

Gruden¹,

Buchholz²,

Kanoun

2014

J. Sens. Sens. Syst.

View full text Add to dashboard Cite

show abstract

“…Surface acoustic waves (SAWs) have been broadly applied in many areas of micro-sensor technology. Gas sensors [ 1 ], biosensors [ 2 , 3 ] and chemical sensors [ 4 ] are a few of the leading applications for SAW sensors. Generally, biosensors are widely used in cancer biomarker detection and bio-agent detection.…”

Section: Introductionmentioning

confidence: 99%

Surface Acoustic Waves (SAW)-Based Biosensing for Quantification of Cell Growth in 2D and 3D Cultures

Wang

Green

Nair

et al. 2015

Sensors

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Detection and quantification of cell viability and growth in two-dimensional (2D) and three-dimensional (3D) cell cultures commonly involve harvesting of cells and therefore requires a parallel set-up of several replicates for time-lapse or dose–response studies. Thus, developing a non-invasive and touch-free detection of cell growth in longitudinal studies of 3D tumor spheroid cultures or of stem cell regeneration remains a major unmet need. Since surface acoustic waves (SAWs) permit mass loading-based biosensing and have been touted due to their many advantages including low cost, small size and ease of assembly, we examined the potential of SAW-biosensing to detect and quantify cell growth. Herein, we demonstrate that a shear horizontal-surface acoustic waves (SH-SAW) device comprising two pairs of resonators consisting of interdigital transducers and reflecting fingers can be used to quantify mass loading by the cells in suspension as well as within a 3D cell culture platform. A 3D COMSOL model was built to simulate the mass loading response of increasing concentrations of cells in suspension in the polydimethylsiloxane (PDMS) well in order to predict the characteristics and optimize the design of the SH-SAW biosensor. The simulated relative frequency shift from the two oscillatory circuit systems (one of which functions as control) were found to be concordant to experimental data generated with RAW264.7 macrophage and A549 cancer cells. In addition, results showed that SAW measurements per se did not affect viability of cells. Further, SH-SAW biosensing was applied to A549 cells cultured on a 3D electrospun nanofiber scaffold that generate tumor spheroids (tumoroids) and the results showed the device's ability to detect changes in tumor spheroid growth over the course of eight days. Taken together, these results demonstrate the use of SH-SAW device for detection and quantification of cell growth changes over time in 2D suspension cultures and in 3D cell culture models, which may have potential applications in both longitudinal 3D cell cultures in cancer biology and in regenerative medicine.

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“…Hence, the acoustic wave sensor can sense the liquid mechanical properties directly [10]. Various applications based on the acoustic wave sensors have been successfully developed, such as chemical detection, mixture solution analysis and blood coagulation monitoring [10][11][12][13][14][15].…”

Section: Introductionmentioning

confidence: 99%

Viscosity and density decoupling method using a higher order Lamb wave sensor

Wang

Kropelnicki

et al. 2014

J. Micromech. Microeng.

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Viscosity and density are two important physical parameters of liquid. Such parameters are widely used for label-free chemical detection. Conventional technologies employ acoustic wave sensors to detect viscosity and density. In these sensors, the liquid under test directly contacts with the surface of the sensor. The produced acoustic wave in the sensor leaks to the adjacent liquid layer, causing a shift in the resonance frequency of the sensor. However, such sensors are not able to separately measure the viscosity and density because these two parameters jointly affect the shift of frequency. Although some indirect methods for decoupling these two parameters have been investigated, either dual-device or simultaneous measurement of frequency and attenuation is required. In this paper, a novel AlN based acoustic wave sensor is developed for decoupling viscosity and density. Multiple higher order modes of Lamb waves are generated in this sensor and employed to interact with the adjacent liquid under test. The frequency change of two unique modes (mode C and mode D) has been found in a linear relationship with viscosity and density, respectively. With this unique feature, viscosity and density of a liquid can be distinguished by a single device, which is promising for potential industrial applications, label-free chemical detection and clinical diagnosis.

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Surface acoustic wave based analytical system for the detection of liquid detergents

Cited by 18 publications

References 33 publications

Electrochemical analysis of water and suds by impedance spectroscopy and cyclic voltammetry

Electrochemical analysis of water and suds by impedance spectroscopy and cyclic voltammetry

Surface Acoustic Waves (SAW)-Based Biosensing for Quantification of Cell Growth in 2D and 3D Cultures

Viscosity and density decoupling method using a higher order Lamb wave sensor

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