Metastable Nanobubbles

Vehmas, Tapani; Makkonen, Lasse

doi:10.1021/acsomega.0c05384

Cited by 20 publications

(14 citation statements)

References 44 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Physically, one would expect a concomitant increase in internal pressure to occur, and hence an outward force acting to restore the radius to its metastable value, reducing the likelihood of sub 10 nm bubbles. The existence of these barriers support the conclusions of the recent publication by Vehmas and Makkonen (2021) , which suggests that bubble dissolution becomes unlikely at small radii as the internal pressures increase significantly.…”

Section: Discussionsupporting

confidence: 86%

Dynamic Surface Tension Enhances the Stability of Nanobubbles in Xylem Sap

et al. 2021

View full text Add to dashboard Cite

Air seeded nanobubbles have recently been observed within tree sap under negative pressure. They are stabilized by an as yet unidentified process, although some embolize their vessels in extreme circumstances. Current literature suggests that a varying surface tension helps bubbles survive, but few direct measurements of this quantity have been made. Here, we present calculations of dynamic surface tension for two biologically relevant lipids using molecular dynamics simulations. We find that glycolipid monolayers resist expansion proportionally to the rate of expansion. Their surface tension increases with the tension applied, in a similar way to the viscosity of a non-Newtonian fluid. In contrast, a prototypical phospholipid was equally resistant to all applied tensions, suggesting that the fate of a given nanobubble is dependent on its surface composition. By incorporating our results into a Classical Nucleation Theory (CNT) framework, we predict nanobubble stability with respect to embolism. We find that the metastable radius of glycolipid coated nanobubbles is approximately 35 nm, and that embolism is in this case unlikely when the external pressure is less negative than –1.5 MPa.

show abstract

Section: Discussionsupporting

confidence: 86%

Dynamic Surface Tension Enhances the Stability of Nanobubbles in Xylem Sap

et al. 2021

View full text Add to dashboard Cite

show abstract

“…Under these conditions, we studied light scattering and absorbance during the chemical reaction. [26][27][28][29][30] Thus, initially we performed a combined study of dynamic light scattering and chemical reaction kinetics. As outlined in Figure SI3, we used a multi-timescale perspective, where individual light scattering count rate traces, measured consecutively during the chemical reaction, were used to construct time-correlation functions in the nanosecond to millisecond timescale, followed by evaluation of timedependent time-correlation functions as the chemical reaction proceeds.…”

Section: Time-dependent Dynamic Light Scatteringmentioning

confidence: 99%

“…We also note that the correlation function decay constants are associated with the hydrodynamic radius of the corresponding Brownian particle, which in the present case is an oxygen nanobubble. [26][27][28][29][30] From the data shown in Figures 2-4, we can thus further connect the equilibrium-averaged correlation times and count rates to nanobubble size and concentration, respectively. The dynamic light scattering measurements at the range of concentrations indicated in Table 1 showed that, under appropriate experimental conditions (initial reactant concentrations, overall reaction time, and colloidal system size) as shown here, it is possible to monitor oxygen nanobubble product formation by way of scattering.…”

Section: Time-dependent Dynamic Light Scatteringmentioning

confidence: 99%

Hydrogen peroxide disproportionation: time-resolved optical measurements of spectra, scattering and imaging combined with correlation analysis and simulations

Ibrahim

Nome

2022

Journal of Molecular Structure

View full text Add to dashboard Cite

We study how time-dependent optical measurements of spectra, scattering, and imaging can be used to add to the understanding of heterogeneous reactions, compared to work performed using tools developed for homogeneous reactions. Using hydrogen peroxide disproportionation by potassium permanganate as a model reaction, we measure the entire spectrum over reaction time, enabling a clear and useful correlation analysis and assignment of chemical species in heterogeneous conditions. We measure time-dependent dynamic light scattering to study oxygen nanobubble product formation kinetics and equilibrium. We perform macroscopic video-rate reaction imaging and information-theoretic analysis to characterize reaction and transport contributions to the observed signal. To illustrate the differences arising from measuring sample subsets vs the entire system, we integrate stochastic and macroscopic numerical simulations of reaction-diffusion to study homogeneous and heterogeneous reaction conditions. We hope the tools presented here may help understanding other chemical reactions in heterogeneous conditions.

show abstract

“…For the same reason, ''an arbitrary constant pressure difference, independent of R'', used by Manning 1 in the derivation of the stability condition, is an inappropriate concept. The pressure difference cannot be arbitrary, because it is set by eqn (11) exactly at all times.…”

mentioning

confidence: 99%

“…The bubble stability problem must be solved by considering the thermodynamics of a complete liquid, gas, vapour system while properly treating the free energy of the interface, and considering the energy barriers that may lead to metastable nanobubbles. 11…”

mentioning

confidence: 99%