Characterization of superhydrophobic materials using multiresonance acoustic shear wave sensors

Kwoun, S.J.; Lee, R.M.; Cairncross, Richard A.; Shah, Pratik; Brinker, C. Jeffrey

doi:10.1109/tuffc.2006.1665096

Cited by 16 publications

(9 citation statements)

References 8 publications

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“…The data in Table 2 reveal “decoupling” of the liquid-phase QCM response (see additionally Section 2), as reported for soot and other types of interface coatings [23,29,32,33,34,35], and demonstrate lack of sperm adhesion. The latter is confirmed via the absence of energy losses (positive and increased R , as in the case of uncoated QCM), normally arising when the liquid environment wets the sensing surface and/or the biomass is rigidly attached [22,23,48].…”

Section: Resultssupporting

confidence: 55%

“…The thin layer of air, inherent for every superhydrophobic coating, creates a strong acoustic reflection plane at the three phase contact line, and despite the sensor being loaded with liquid, its resonance is dominated mainly by the quartz plate’s thickness [29]. A small fraction of wave energy is still transferred to the liquid via the surface features, yielding diminished viscosity driven dissipation and much lower sensor signal than the theoretical predictions of Kanazawa and Gordon (see Table 2) [23,29,32,33,34,35]. It is pertinent to mention that the soot coated sensor is not affected/wetted by the buffer and prior to adding the analytes, the frequency shift is ~0 Hz (see Figure S10 in the Supporting Information).…”

Section: Resultsmentioning

confidence: 99%

“…In fact, for superhydrophobic surfaces (coatings), the air trapped within the surface asperities (known as plastron) localizes the shear-horizontal waves mostly in the crystal’s bulk [29]. In turn, the surface oscillations are effectively “decoupled” from the liquid and the generated frequency and resistance fluctuations are much lower in comparison with the reference values predicted by Equations (1) and (2) [23,29,32,33,34,35].…”

Section: Theoretical Aspects Of the Qcm’s Operation In Liquid Envimentioning

confidence: 99%

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Superhydrophobic Soot Coated Quartz Crystal Microbalances: A Novel Platform for Human Spermatozoa Quality Assessment

Esmeryan

Ganeva²,

Stamenov³

et al. 2019

Sensors

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The functionality of human spermatozoa is a key factor for the success rate of natural human reproduction, but unfortunately the infertility progressively increases due to multifarious environmental factors. Such disquieting statistics requires the employment of sophisticated computer-assisted methods for semen quality analysis, whose precision, however, is unreliable in cases of patients with low sperm concentrations. In this study, we report a novel quartz crystal microbalance (QCM) based biosensor for in-situ quality assessment of male gametes, comprising a superhydrophobic soot coating as an interface sensing material. The soot deposition on the surface of a 5 MHz QCM eliminates the noise that normally arises upon immersion of the uncoated sensor in the test liquid environment, allowing the detection of human spermatozoa down to 1000–100,000 units/mL (1–100 ppb). Furthermore, the soot coated QCM delimitates in a highly repeatable way the immotile and motile sperm cells by inducing fundamentally distinct responses in respect to sensor sensitivity and signal trends. The obtained results reveal the strong potential of the superhydrophobic QCM for future inclusion in diverse laboratory analyses closely related to the in vitro fertilization procedures, with a final aim of gaining practical approaches for diagnoses and selection of male gametes.

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Section: Resultssupporting

confidence: 55%

Section: Resultsmentioning

confidence: 99%

Section: Theoretical Aspects Of the Qcm’s Operation In Liquid Envimentioning

confidence: 99%

See 1 more Smart Citation

Superhydrophobic Soot Coated Quartz Crystal Microbalances: A Novel Platform for Human Spermatozoa Quality Assessment

Esmeryan

Ganeva²,

Stamenov³

et al. 2019

Sensors

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“…Up to now the monitoring of wetting transitions on SH surfaces has been usually based on optical methods, electrochemical impedance spectroscopy and using ultrasound [9][10][11]. Recently it has been reported that through a superhydrophobization of the QCM's surface it is possible to decouple the sensor response [12][13][14][15].…”

Section: Introductionmentioning

confidence: 99%

Manipulated wettability of a superhydrophobic quartz crystal microbalance through electrowetting

Esmeryan¹,

McHale²,

Trabi³

et al. 2013

J. Phys. D: Appl. Phys.

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The liquid phase response of quartz crystal microbalances (QCM) with a thin coating (~9 µm) of epoxy resin with and without a carbon nanoparticles top layer is reported. The nanoparticles convert the epoxy surface to a superhydrophobic one with a high static contact angle (~151º-155º) and low contact angle hysteresis (~1º-3.7º) where droplets of water are in the suspended Cassie-Baxter state. The frequency decrease of the fully immersed QCM with the superhydrophobic surface is less than with only epoxy layer, thus indicating a decoupling of the QCM response. A wettability transition to a liquid penetrating into the surface roughness state (for droplets a high contact angle hysteresis Wenzel state) was triggered using a molarity of ethanol droplet test (MED) and electrowetting; the MED approach caused some surface damage. The electrowetting induced transition caused a frequency decrease of 739 Hz at a critical voltage of ~100 V compared to the QCM in air. This critical voltage correlates to a contact angle decrease of 26º and a high contact angle hysteresis state in droplet experiments. These experiments provide a proof-of-concept that QCMs can be used to sense wetting state transitions and not only mass attachments or changes in viscosity-density products of liquids. PACS:68.08Bc -wetting in liquid solid interfaces; 77.65Fs -quartz crystal resonators

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“…Kwoun et al [76] introduced the method of multi resonance thickness shear mode sensors to characterize superhydrophobic surfaces. The technique on which this method works is based on high frequency shear acoustic waves generated by a piezoelectric quartz resonator thickness shear mode sensor.…”

Section: Roughening a Low Surface Energy Materialsmentioning

confidence: 99%

Water–diesel secondary dispersion separation using superhydrophobic tubes of nanofibers

Viswanadam

2013

Separation and Purification Technology

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In diesel engines, sulfur and nitrogen compounds present in the fuel forms oxides during combustion. In the presence of water, these oxides form acidic products which leads to corrosion of engine parts. Hence, it is desired to remove water from diesel fuel before it enters the engine. In this work, superhydrophobic nanofiber mat filters are fabricated in flat sheet and cylindrical geometries by the process of electrospinning and are tested for separation of water dispersions in diesel fuel. Superhydrophobic surfaces are oleophilic due to their low surface energy. The superhydrophobic nanofiber mat acts as a barrier in restricting water droplets while allowing the nonaqueous phase to easily flow through it. The cylindrical nanofiber filters performed with separation efficiency as high as 98% on a total mass basis for water drops in the range of 7-50 microns in ultra low sulphur diesel fuel (ULSD) with a face velocity of 1.55 cm/min. The flat filter geometry performed at about 92% separation efficiency at a similar face velocity. This work shows practical water-diesel separation filters can be constructed in tubular geometries.

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Characterization of superhydrophobic materials using multiresonance acoustic shear wave sensors

Cited by 16 publications

References 8 publications

Superhydrophobic Soot Coated Quartz Crystal Microbalances: A Novel Platform for Human Spermatozoa Quality Assessment

Superhydrophobic Soot Coated Quartz Crystal Microbalances: A Novel Platform for Human Spermatozoa Quality Assessment

Manipulated wettability of a superhydrophobic quartz crystal microbalance through electrowetting

Water–diesel secondary dispersion separation using superhydrophobic tubes of nanofibers

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