Solubility and dissolution rate of silica in acid fluoride solutions

Mitra, Arijit; Rimstidt, J. Donald

doi:10.1016/j.gca.2009.08.027

Cited by 41 publications

(23 citation statements)

References 61 publications

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“…15.B). This can probably be explained by a high quartz solubility in the HF-rich fluid (Ellis, 1973;Mitra and Rimstidt, 2009) Mn-Fe-poor rocks (veins and dykes) rather than in the schist suggests that there was no need for fluid interaction with the latter to provide the Fe and Mn needed for wolframite precipitation.…”

Section: Mineralizing Processes Topazification (Wolframite B Episode)mentioning

confidence: 99%

Contrasting fluid behavior during two styles of greisen alteration leading to distinct wolframite mineralizations: The Echassières district (Massif Central, France)

Monnier

Salvi

Jourdan

et al. 2020

Ore Geology Reviews

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 Fluid cooling, without evidence of sharp pressure variations, is the main cause for one wolframite mineralization episode.  Fluid flashing (vaporization), triggered by fracture-induced pressure drops, initiated crystallization of a second type of wolframite mineralization.  Greisenization of the Beauvoir granite is a continuous process (ca. 400°C down to 190°C), occurring at high temperature as pervasive alteration of the granite body, while at lower temperature it is localized to a vein system.  Globally, greisen-forming fluids have a strong potential for transporting and precipitating W. 2  In greisen systems worldwide, regional veins distal to the altered causative magmatic body can be mineralized by greisen-forming fluids.

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Section: Mineralizing Processes Topazification (Wolframite B Episode)mentioning

confidence: 99%

Contrasting fluid behavior during two styles of greisen alteration leading to distinct wolframite mineralizations: The Echassières district (Massif Central, France)

Monnier

Salvi

Jourdan

et al. 2020

Ore Geology Reviews

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“…Here, the formed HF can react with the oxygen-containing silicon electrode material [16,17] to etch its surface or the complete material and led to a rapid break-down of the cell. [10,12] In this manuscript, we made an attempt to clarify the time dependency of the HF formation upon mild temperature exposure and try to explain the catalytic pathway of LiPF 6 degradation in the presence of Si-OX [X=H, O or OH] groups.…”

Section: (2)mentioning

confidence: 99%

The mechanism of HF formation in LiPF6 based organic carbonate electrolytes

Lux

Lucas

Elam

et al. 2012

Electrochemistry Communications

429

350

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Spectroscopic ellipsometry was used to study the time-dependent formation of HF upon the thermal degradation of LiPF 6 at 50°C in a lithium ion battery electrolyte containing ethylene carbonate and diethyl carbonate. The generated HF was monitored by following the etching rate of a 300 nm thick SiO 2 layer, grown on both sides of a silicon wafer substrate, as a function of the immersion time in the electrolyte at 50°C. It was found that the formation of HF starts after 70 hours of exposure time and occurs following several different phases. The amount of generated HF was calculated using an empirical formula correlating the etching rate to the temperature. Combining the results of the HF formation with literature data, a simplified mechanism for the formation of the HF involving LiPF 6 degradation, and a simplified catalytical reaction pathway of the formed HF and silicon dioxide is proposed to describe the kinetics of HF formation.

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“…We have subjected ensilicated proteins to treatments including heating to 100 °C under dry and wet conditions, and aging for up to six months at room temperature. Silica is specifically vulnerable to attack by acidic fluoride solutions 23 . We therefore use a release protocol involving treatment with a dilute solution of sodium fluoride, acidified to pH 4.0 using HCl, to release the ensilicated proteins into solution.…”

mentioning

confidence: 99%

Thermal stability, storage and release of proteins with tailored fit in silica

Chen

Smith

Hicks

et al. 2017

Sci Rep

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Biological substances based on proteins, including vaccines, antibodies, and enzymes, typically degrade at room temperature over time due to denaturation, as proteins unfold with loss of secondary and tertiary structure. Their storage and distribution therefore relies on a “cold chain” of continuous refrigeration; this is costly and not always effective, as any break in the chain leads to rapid loss of effectiveness and potency. Efforts have been made to make vaccines thermally stable using treatments including freeze-drying (lyophilisation), biomineralisation, and encapsulation in sugar glass and organic polymers. Here for the first time we show that proteins can be enclosed in a deposited silica “cage”, rendering them stable against denaturing thermal treatment and long-term ambient-temperature storage, and subsequently released into solution with their structure and function intact. This “ensilication” method produces a storable solid protein-loaded material without the need for desiccation or freeze-drying. Ensilication offers the prospect of a solution to the “cold chain” problem for biological materials, in particular for vaccines.

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Solubility and dissolution rate of silica in acid fluoride solutions

Cited by 41 publications

References 61 publications

Contrasting fluid behavior during two styles of greisen alteration leading to distinct wolframite mineralizations: The Echassières district (Massif Central, France)

Contrasting fluid behavior during two styles of greisen alteration leading to distinct wolframite mineralizations: The Echassières district (Massif Central, France)

The mechanism of HF formation in LiPF6 based organic carbonate electrolytes

Thermal stability, storage and release of proteins with tailored fit in silica

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