Nanobubble boundary layer thickness quantified by solvent relaxation NMR

Zhang, Ruiyi; Gao, Ya; Chen, Lan; Ge, Guanglu

doi:10.1016/j.jcis.2021.11.072

Cited by 16 publications

(12 citation statements)

References 33 publications

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“…In the large microbubbles, the critical film thickness by bubble rupture was reported to be approximately 30 nm in 10 µm sodium dodecyl sulfate (SDS) and 0.3 M NaCl solution 48 . However, the measurement results of the boundary layer thickness around the bubble by IFA differ from the above-mentioned reference 47 , 48 .…”

Section: Introductionmentioning

confidence: 62%

“…In this study, the hydrodynamic diameter measured by IFA and boundary layer thickness determined with NTA were measured for the first time. On the other hand, with the help of DLS and solvent relaxation NMR measurement results, the boundary layer thickness of nanobubbles is calculated to be about 40 nm 47 . In the large microbubbles, the critical film thickness by bubble rupture was reported to be approximately 30 nm in 10 µm sodium dodecyl sulfate (SDS) and 0.3 M NaCl solution 48 .…”

Section: Introductionmentioning

confidence: 99%

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Nanobubble size distribution measurement by interactive force apparatus under an electric field

Han

Chen

et al. 2023

Sci Rep

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Nanobubbles have been applied in many fields, such as environmental cleaning, material production, agriculture, and medicine. However, the measured nanobubble sizes differed among the measurement methods, such as dynamic light scattering, particle trajectory, and resonance mass methods. Additionally, the measurement methods were limited with respect to the bubble concentration, refractive index of liquid, and liquid color. Here, a novel interactive force measurement method for bulk nanobubble size measurement was developed by measuring the force between two electrodes filled with bulk nanobubble-containing liquid under an electric field when the electrode distance was changed in the nm scale with piezoelectric equipment. The nanobubble size was measured with a bubble gas diameter and also an effective water thin film layer covered with a gas bubble that was estimated to be approximately 10 nm based on the difference between the median diameter of the particle trajectory method and this method. This method could also be applied to the solid particle size distribution measurement in a solution.

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Section: Introductionmentioning

confidence: 62%

Section: Introductionmentioning

confidence: 99%

Nanobubble size distribution measurement by interactive force apparatus under an electric field

Han

Chen

et al. 2023

Sci Rep

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“…Hirai et al (2019) studied the structure of ultrafine bubbles using small-and wide-angle X-ray scattering and explained that an ultrafine bubble is surrounded by a diffusive boundary, and the electron density differs between the diffusive boundary and the bulk solution. Zhang R. et al (2022a) quantified the boundary layer thickness of the ultrafine bubbles using solvent relaxation of nuclear magnetic resonance. For effective gas diameters of 243.5, 358.5, and 412.8 nm, the determined boundary layer thicknesses were 41.5, 44.8, and 35.9 nm, and the ratios of the boundary layer thickness to the effective gas diameter were 0.17, 0.125, and 0.087, respectively.…”

Section: Stabilitymentioning

confidence: 99%

Characteristics of Ultrafine Bubbles (Bulk Nanobubbles) and Their Application to Particle-Related Technology

Yasuda

2024

KONA

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Ultrafine bubbles (bulk nanobubbles), small bubbles less than 1 µm in diameter, have attracted academic and industrial attention because of their numerous advantages, including their chemical-free nature and extraordinarily long lifetime. The long lifetime is related to the much higher Brownian motion velocity than buoyancy. The reason why ultrafine bubbles can endure under stable conditions is still unclear, even though their inside is highly pressured. They have several characteristics, such as pH-dependent surface charge and reduction in friction. They are also closely related to ultrasound. Ultrafine bubbles are generated and removed by selecting the ultrasonic frequency. Reaction and separation using ultrasonic cavitation and atomization, respectively, are enhanced by ultrafine bubbles. They can produce hollow nanoparticles, enhance adsorption on activated carbon, and clean solid surfaces. This review discusses the fundamental and ultrasonic characteristics of ultrafine bubbles and their application to particle-related technology: fine particle synthesis, adsorption, desorption, extraction, cleaning, and prevention of fouling.

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“…Nuclear magnetic resonance (NMR) relaxometry is also proving to be an invaluable technique to study dispersion surface properties, or otherwise applied industrially to analyze pore structures and wettability in reservoir rocks for enhanced oil recovery, − where the use of very low-field, desktop instruments has provided an avenue for inline or at-line analysis. Originally, the technique was largely developed for rapid surface area measurements of nanoparticle dispersions , but has advanced extensively to incorporate analyses of a number of colloidal surface chemistry effects − and even nanobubbles . For example, recent studies have utilized the technique to evaluate the exfoliation or surface chemistry of graphene oxide and other related carbon materials − as well as the stability and aggregation of various mineral dispersions, − and influence of ultrasonication on dispersion, where it has also pointedly been used to quantify organic and inorganic dispersants. − It has also been used to characterize different TiO 2 nanocrystal polymorphs .…”

Section: Introductionmentioning

confidence: 99%

Analysis of Adsorbed Polyphosphate Changes on Milled Titanium Dioxide, Using Low-Field Relaxation NMR and Photoelectron Spectroscopy

et al. 2023

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In this study, changes in the adsorbed amount and surface structure of sodium hexametaphosphate (SHMP) were investigated for aluminum-doped TiO 2 pigment undergoing milling. Relaxation NMR was utilized as a potential at-line technique to monitor the effect of milling on surface area and surface chemistry, while XPS was used primarily to consider the dispersant structure. Results showed that considerable amounts of weakly adsorbed SHMP could be removed with washing, and the level of dispersant removal increased with time, highlighting destructive effects of sustained high-energy milling. Nonetheless, there were no significant chemical changes to the dispersant, although increases to the bridging oxygen (BO) peak full width at half-maximum (FWHM) suggested some chemical degradation was occurring with excess milling. Relaxation NMR revealed a number of important features. Results with unmilled material indicated that dispersant adsorption could be tracked with pseudo-isotherms using the relative enhancement rate (R sp ), where the R sp decreased with dispersant coverage, owing to partial blocking of the quadrupolar surface aluminum. Milled samples were also tracked, with very accurate calibrations of surface area possible from either T 1 or T 2 relaxation data for systems without dispersant. Behavior was considerably more complicated with SHMP, as there appeared to be an interplay between the dispersant surface coverage and relaxation enhancement from the surface aluminum. Nevertheless, findings highlight that relaxation NMR could be used as a real-time technique to monitor the extent of milling processes, so long as appropriate industrial calibrations can be achieved.

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Nanobubble boundary layer thickness quantified by solvent relaxation NMR

Cited by 16 publications

References 33 publications

Nanobubble size distribution measurement by interactive force apparatus under an electric field

Nanobubble size distribution measurement by interactive force apparatus under an electric field

Characteristics of Ultrafine Bubbles (Bulk Nanobubbles) and Their Application to Particle-Related Technology

Analysis of Adsorbed Polyphosphate Changes on Milled Titanium Dioxide, Using Low-Field Relaxation NMR and Photoelectron Spectroscopy

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