Evidence that ultrasonically-induced microbubbles carry a negative electrical charge

Watmough, D.J.; Shiran, Mohammad Reza; Quan, K.M.; Sarvazyan, Armen; Khizhnyak, E. P.; Пашовкин, Т. Н.

doi:10.1016/0041-624x(92)90007-9

Cited by 26 publications

(7 citation statements)

References 14 publications

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“…However, in this study, the removal efficiency increased with the decrease of pH. This can be due to this fact that the positively charged TC molecules at this pH will accumulate at the negatively charged liquid-bubble interface of solution in which the concentration of reactive radicals and the temperature are higher (Watmough et al 1992;De Bel et al 2009). This could be the reason why the degradation efficiency of TC is higher at acidic pH.…”

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confidence: 91%

Sonocatalytic degradation of tetracycline antibiotic in aqueous solution by sonocatalysis

Hoseini

Safari

Kamani

et al. 2013

Toxicological & Environmental Chemistry

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Tetracycline (TC), one of the most common antibiotics, is often poorly bio-degraded in conventional wastewater treatment plants. In this study, the sonocatalytic degradation of TC was investigated using TiO 2 nano-particles as catalyst. The effect of pH, initial TC concentrations, reaction times, and H 2 O 2 concentrations were evaluated. The efficacy of ultrasonic irradiation alone in the removal of this pollutant was negligible but removal efficiency increased upon addition of TiO 2 up to 250 mg L À1 ; increase of pH and initial TC concentration attenuated TC degradation. Addition of H 2 O 2 raised the removal efficiency so that complete removal of TC was achieved within 75 min.

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confidence: 91%

Sonocatalytic degradation of tetracycline antibiotic in aqueous solution by sonocatalysis

Hoseini

Safari

Kamani

et al. 2013

Toxicological & Environmental Chemistry

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“…2 For example, microbubbles used in ultrasound can be negatively charged on their surfaces. 3 In the normal situation, red blood cells are negatively charged so that they will not aggregate together. 4 One consequence of the existence of charges on the surfaces of particles or cells in an electrolyte is that the particles and the electrolyte will be affected by an electric field in various ways, which are collectively called electrokinetic effects.…”

Section: Introductionmentioning

confidence: 99%

Electric-field induced strain in biological tissues

Doganay

2010

The Journal of the Acoustical Society of America

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This paper reports a new effect whereby a physiological-level direct-current electrical field (at 1.4 V/cm) can induce time-varying mechanical strain in various types of biological tissues and gel phantoms. This effect cannot be explained by the piezoelectric effect, tissue contraction, temperature changes, and electrorestriction. The induced strain in tissues was analyzed by processing ultrasound echo signals. The sample expanded perpendicularly to the applied electric field. The expansion rate depended on the history of the applied electric field. The speed of sound changed little compared with the expansion. The new effect might be related to electrokinetic effects.

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“…The net charges on the surface of particles in an electrolyte can be estimated by measuring the Zeta-potential [12]. For example, microbubbles used in ultrasound can be negatively charged on their surfaces [37]. In the normal situation, red blood cells are negatively charged so that they will not aggregate together [9].…”

Section: Introduction Chapter 1 Introductionmentioning

confidence: 99%

Monitoring electric field induced changes in biological tissue by using ultrasound

Doganay¹

2021

Preprint

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A new effect resulting from the application of an electric field to biomaterials was discovered by analyzing ultrasound echo signals. The new effect was observed in ex-vivo biological tissues such as porcine heart, muscle, fat, and liver and tissue mimicking phantoms for an electric field were on the order of a few Volt/cm. Changes in the arrival time of ultrasound echoes were processed using cross-correlation based algorithms. The gradient of shifting along the ultrasound axis showed a strain in the direction perpendicular to the applied electric field. The electric field also lead to changes in the ultrasound echo amplitude. The amount of the strain and the echo amplitude change depended on the history of the applied electric field. The new effect cannot be explained by resistive heating, piezoelectric effect, or electrostriction. It might be related to the electrokinetic effects.

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Evidence that ultrasonically-induced microbubbles carry a negative electrical charge

Cited by 26 publications

References 14 publications

Sonocatalytic degradation of tetracycline antibiotic in aqueous solution by sonocatalysis

Sonocatalytic degradation of tetracycline antibiotic in aqueous solution by sonocatalysis

Electric-field induced strain in biological tissues

Monitoring electric field induced changes in biological tissue by using ultrasound

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