Diffusion of H+, H2O and D2O in polymer/silicate gels

Lakatos, István; Lakatos-Szabó, J.

doi:10.1016/j.colsurfa.2004.06.035

Cited by 16 publications

(5 citation statements)

References 9 publications

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“…3d). These ionic/molecular diffusivity values are substantially similar to those reported previously, 22,23 and determine the responsivity of the chips in real-time detection.…”

Section: Resultssupporting

confidence: 87%

Non-invasive monitoring of biochemicals in hydrogel-assisted microfluidic chips

et al. 2023

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“…3d). These ionic/molecular diffusivity values are substantially similar to those reported previously, 22,23 and determine the responsivity of the chips in real-time detection.…”

Section: Resultssupporting

confidence: 87%

Non-invasive monitoring of biochemicals in hydrogel-assisted microfluidic chips

et al. 2023

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“…refs. 109,110), or (2) congruent dissolution through hydrolysis in the absence of diffusion, wherein an O-H/D bond participates in the activated complex. Both mechanisms may be affected by an H 2 O-D 2 O solvent isotope effect 111 .…”

Section: Discussionmentioning

confidence: 99%

Undetected perovskite phase interference with zirconolite dissolution measurements

Goût,

Mir,

Fairclough

et al. 2024

npj Mater Degrad

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Zirconolite ceramics present a chemically durable host matrix for waste actinides, but zirconolite dissolution rates reported in the literature often vary significantly. Here, the release of Ca and Al from a hot isostatically pressed zirconolite (Ca0.8Zr0.9Ce0.3Ti1.6Al0.4O7.0) was shown to be predominantly driven by preferential dissolution of minor perovskite and alumina phases. Both phases were undetectable by XRD, and the perovskite was difficult to detect by SEM-EDS. Whilst the zirconolite phase exhibited no signs of alteration, dissolution of the perovskite proceeded congruently without forming a hydrated altered layer or diffusion of protons into the solid that would be indicative of an ion-exchange mechanism. The weak temperature dependence of dissolution (40, 90 and 150 °C) showed that kinetics were limited by transport and a mixed transport-surface controlled reaction for Ca and Al, respectively. A significant H2O-D2O isotope effect on dissolution was observed for Ca but not for Al at all temperatures. The former was consistent with an abated rate of hydrolysis in the absence of a contribution from diffusion, whilst the latter could be attributed to differences in the activated complex for Ca and Al release through hydrolysis. These results demonstrate the role of a secondary phase perovskite in the dissolution kinetics of zirconolite even when perovskite occurs at low concentration and evades detection by bulk techniques such as XRD. This study provides a potential explanation of variations in zirconolite ceramic dissolution rates present in the literature and provides a null result to tests of an incongruent Ca release mechanism from zirconolite.

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“…If pores are closed, solutes will still have to diffuse through the walls surrounding the pores. Data to calculate diffusion coefficients (D) of solutes in gels are determined using various experimental techniques and D values estimated using Fick's second law which masks all structural and interaction effects in an Beffective diffusion coefficient^ [117,129]. Mass transport in porous gels has been described as highly anomalous and not susceptible to be described by Fick's law alone [133].…”

Section: Mass Transfer Process -Incorporation Of Micronutrientsmentioning

confidence: 99%

Gels as Precursors of Porous Matrices for Use in Foods: a Review

Cuadros

Aguilera

2015

Food Biophysics

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Gelation is a structuring mechanism commonly used in foods to produce soft and homogeneous structures. Techniques applied in other areas of science (e.g., bioengineering, biotechnology and electronics) aims at producing wet and dried porous gel matrices and they may find applications in foods. This review describes several processes to manufacture porous structures such as scaffolding, ice templating, use of porogens, oleogelation, incorporation and entrapment of bubbles, enzymatic modifications, microfluidics and microfabrication techniques, among others. Several examples are also presented. Beyond textural properties, porous gels and sponges may be tailored in their mass transfer characteristics to achieve specific rates of release of bioactive molecules, nutrients and flavors.

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Diffusion of H+, H2O and D2O in polymer/silicate gels

Cited by 16 publications

References 9 publications

Non-invasive monitoring of biochemicals in hydrogel-assisted microfluidic chips

Non-invasive monitoring of biochemicals in hydrogel-assisted microfluidic chips

Undetected perovskite phase interference with zirconolite dissolution measurements

Gels as Precursors of Porous Matrices for Use in Foods: a Review

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