Effect of ultrasound on the dissolution of magnesium hydroxide: pH-stat and nanoscale observation

Tang, Xiaojia; Liu, Miao; Tang, Qian; Du, Zhongyuan; Bai, Subei; Zhu, Yimin

doi:10.1016/j.ultsonch.2019.01.023

Cited by 8 publications

(9 citation statements)

References 31 publications

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“…Therefore, we first examined, superficially, the shape, size, and morphology of solid particulates (i.e., around four to six particulates of antigorite, calcite, and quartz; shown in Figure S1 in the Supporting Information) prior to and following 30 min of dissolution under conditions of acoustic stimulation for solids that show high, intermediate, and low sensitivity to acoustic stimulation, respectively (see Table ). We observed that antigorite and calcite particulates have small “chips” broken off and that the edges and corners of the antigorite and calcite particulates became smoother following stimulation due to interactions with high-velocity microjets . In contrast, the quartz particles appear virtually unaffected by sonication (see Figure S1 in the Supporting Information).…”

Section: Results and Discussionmentioning

confidence: 90%

“…We observed that antigorite and calcite particulates have small "chips" broken off and that the edges and corners of the antigorite and calcite particulates became smoother following stimulation due to interactions with high-velocity microjets. 30 In contrast, the quartz particles appear virtually unaffected by sonication (see Figure S1 in the Supporting Information). While qualitative, these observationsalthough coarseare consistent with the fact that the dissolution kinetics of quartz are broadly unaffected by acoustic stimulation.…”

Section: ■ Results and Discussionmentioning

confidence: 99%

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Atomic Dislocations and Bond Rupture Govern Dissolution Enhancement under Acoustic Stimulation

Tang

Dong

Arnold

et al. 2020

ACS Appl. Mater. Interfaces

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By focusing the power of sound, acoustic stimulation (i.e., often referred to as sonication) enables numerous “green chemistry” pathways to enhance chemical reaction rates, for instance, of mineral dissolution in aqueous environments. However, a clear understanding of the atomistic mechanism(s) by which acoustic stimulation promotes mineral dissolution remains unclear. Herein, by combining nanoscale observations of dissolving surface topographies using vertical scanning interferometry, quantifications of mineral dissolution rates via analysis of solution compositions using inductively coupled plasma optical emission spectrometry, and classical molecular dynamics simulations, we reveal how acoustic stimulation induces dissolution enhancement. Across a wide range of minerals (Mohs hardness ranging from 3 to 7, surface energy ranging from 0.3 to 7.3 J/m2, and stacking fault energy ranging from 0.8 to 10.0 J/m2), we show that acoustic fields enhance mineral dissolution rates (reactivity) by inducing atomic dislocations and/or atomic bond rupture. The relative contributions of these mechanisms depend on the mineral’s underlying mechanical properties. Based on this new understanding, we create a unifying model that comprehensively describes how cavitation and acoustic stimulation processes affect mineral dissolution rates.

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Section: Results and Discussionmentioning

confidence: 90%

Section: ■ Results and Discussionmentioning

confidence: 99%

Atomic Dislocations and Bond Rupture Govern Dissolution Enhancement under Acoustic Stimulation

Tang

Dong

Arnold

et al. 2020

ACS Appl. Mater. Interfaces

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“…16 Large particles have been directly observed to be broken into flakes by ultrasound, further facilitating dissolution. 17 These results have explained the mechanisms of dissolution enhancement by sonication; however, the energy intensity of acoustic stimulationas an approach for enhancing dissolutionhas not been robustly ascertained. The quantification and comparison of the energy intensity, as compared to traditional dissolution enhancement methods such as stirring, grinding, and heating, is a critical gap to address for practical utilization of sonication.…”

Section: Introductionmentioning

confidence: 92%

“…Beyond additive-based methods (e.g., using mineral acids, or lixiviants), − the reactivity (i.e., aqueous dissolution rate) of a solute can be increased by (a) stirring (i.e., convective mixing) which enhances ion transport (e.g., away from the dissolving surface, into bulk solution) in solution, (b) grinding the solute into increasingly finer particles to increase the interfacial surface area (i.e., at the solute–solvent interface) available for dissolution, and (c) heating the solute–solvent system given the strong dependence of reaction rates on temperature. More recently, acoustic stimulation has been shown to be effective at greatly enhancing the dissolution rates of inorganic minerals (e.g., 11-fold increase in calcite dissolution rate) and glasses − (e.g., near-3-fold increase in obsidian dissolution rate). This has been attributed to the ability of acoustic energy to (1) induce solute fracture, (2) activate dislocations on the solute’s surface, and (3) reduce the activation energy of the dissolution reaction .…”

Section: Introductionmentioning

confidence: 99%

“…This has been attributed to the ability of acoustic energy to (1) induce solute fracture, (2) activate dislocations on the solute’s surface, and (3) reduce the activation energy of the dissolution reaction . Large particles have been directly observed to be broken into flakes by ultrasound, further facilitating dissolution . These results have explained the mechanisms of dissolution enhancement by sonication; however, the energy intensity of acoustic stimulationas an approach for enhancing dissolutionhas not been robustly ascertained.…”

Section: Introductionmentioning

confidence: 99%

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Rapid Elemental Extraction from Ordered and Disordered Solutes by Acoustically-Stimulated Dissolution

et al. 2021

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Alkaline industrial wastes (e.g., slags: ordered crystalline solids, and fly ashes: disordered solids) represent abundant reservoirs of elements such as silicon and calcium. Rapid elemental extractions from these wastes, however, have often relied on the use of “stoichiometric additives” (i.e., acids or bases). Herein, we demonstrate that acoustic stimulation enhances the release of network-forming Si species from crystalline blast furnace slags and amorphous fly ashes at reaction temperatures less than 65 °C. These additive-free enhancements are induced by cavitation processes which reduce the apparent activation energy of solute dissolution (E a, kJ/mol) by up to 40% as compared to unstimulated conditions. Because of the reduction in the apparent activation energy, acoustic stimulation features an energy intensity that is up to 80% lower in promoting dissolution, as compared to other additive-free methods such as enhancing the solute’s surface area, introducing heat, or convectively mixing the solvent. Based on atomic topology analysis, we show that the reduction in apparent dissolution activation energy upon acoustic stimulation scales with the number of weak topological constraints per atom in the atomic network of the dissolving solute, independent of their ordered or disordered nature. This suggests that sonication breaks the weakest constraints in the solute’s atomic network, which, in turn, facilitates dissolution. The results suggest the ability of acoustic stimulation to enhance waste utilization and circularity, by enabling efficient resource extraction from industrial wastes.

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Magnesium Optrodes for Real‐Time Optical Monitoring of Water Transport in Ultrathin Encapsulations for Bioelectronics

Mariello,

Kavungal,

Gallagher

et al. 2024

Adv Funct Materials

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Recent studies investigated the hydrolysis of Magnesium (Mg) thin films, highlighting their potential use in biodegradable devices. Quantitatively monitoring the degradation rate and morphological changes of Mg through optical methods and light‐delivery devices offers an innovative, contactless technique, independent of electrical wiring. This method is particularly useful for challenging sensing applications. This study introduces a set of strategies based on Mg optrodes where hydrolysis drives the real‐time monitoring of biofluid penetration through thin‐film encapsulations for bioelectronics. This enables a straightforward assessment of their long‐term reliability, through a quantitative correlation between the water transmission rate (WTR) of the encapsulation and the Mg optical modifications. The optical response of the corroding Mg films deposited on glass substrates and multimode optical fibers tips, within the visible spectrum is characterized. Finally, it is demonstrated that nanopatterning of Mg films as plasmonic nanoantennas significantly enhances the sensitivity of the quantitative approach in the mid‐Infrared spectrum through localized plasmon effects. This method achieves a WTR detection of 6.9 × 10−3 gm−2 day−1 in phosphate buffer solution (25 °C), with a theoretical lower detection limit of ≈10−5 gm−2 day−1. These findings pave the way for the development of a new class of nano‐optical water‐permeation sensors.

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Effect of ultrasound on the dissolution of magnesium hydroxide: pH-stat and nanoscale observation

Cited by 8 publications

References 31 publications

Atomic Dislocations and Bond Rupture Govern Dissolution Enhancement under Acoustic Stimulation

Atomic Dislocations and Bond Rupture Govern Dissolution Enhancement under Acoustic Stimulation

Rapid Elemental Extraction from Ordered and Disordered Solutes by Acoustically-Stimulated Dissolution

Magnesium Optrodes for Real‐Time Optical Monitoring of Water Transport in Ultrathin Encapsulations for Bioelectronics

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