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Antimony-bearing schwertmannite transformation to goethite: A driver of antimony mobilization in acid mine drainage.
J Hazard Mater
December 2024
Faculty of Science and Engineering, Southern Cross University, Lismore, NSW 2480, Australia. Electronic address:
Antimony(V) mobility in acid mine drainage (AMD) is often controlled by sorption and coprecipitation with schwertmannite - a poorly-ordered Fe(III) oxyhydroxysulfate mineral. However, due to its metastable nature, schwertmannite transforms over time to more thermodynamically stable Fe(III) phases, such as goethite. This study examines how transformation of Sb(V)-bearing schwertmannite to goethite impacts Sb(V) mobility, while also assessing the role that Sb(V) may play in stabilizing schwertmannite against such transformation.
View Article and Find Full Text PDFSmall-Angle Scattering Indicates Equilibrium Instead of Metastable Capillary Condensation in SBA-15 Mesoporous Silica.
Langmuir
August 2024
Department of Chemical Engineering, University of Liège B6A, Allée du Six Août 3, B-4000 Liège, Belgium.
Questions about the origin of the adsorption/desorption hysteresis in mesoporous materials are as old as sorption experiments themselves. The historical conception that underlines most existing methods to extract pore size distributions from sorption data assumes that adsorption is a metastable process and that desorption takes place at thermodynamic equilibrium. In this work, we measure nitrogen and argon sorption on a series of 14 SBA-15 ordered mesoporous silicas and use small-angle X-ray scattering to independently determine their pore sizes.
View Article and Find Full Text PDFSynthesis of Metastable Calcium Carbonate Using Long-Chain Bisphosphonate Molecules.
ACS Appl Mater Interfaces
June 2024
Department of Materials Science and Engineering, University of California, Davis, Davis, California 95616, United States.
Cementation in construction materials primarily relies on the aqueous precipitation of minerals such as carbonates and silicates. The kinetics of nucleation and growth play a critical role in the development of strength and durability, yet our understanding of the kinetic controls governing phase formation and porosity reduction in cements remains limited. In this study, we synthesized bisphosphonate molecules with varying alkyl chain lengths and functional groups to investigate their impact on calcium carbonate precipitation.
View Article and Find Full Text PDFBromine versus chlorine substituent in breathing crystals of a copper(I) coordination compound with a triazolamine Schiff base.
Acta Crystallogr B Struct Sci Cryst Eng Mater
October 2023
Department of Chemistry, University of Wrocław, 14. F. Joliot-Curie, Wrocław, 50-383, Poland.
Article Synopsis
- The compound N-[4-(chlorobenzylidene)-4H-1,2,4-triazol-4-amine reacts with copper(I) perchlorate(VII) to form metastable breathing crystals with X-shaped binuclear units.
- Using trifluoromethanesulfonate instead of perchlorate leads to non-breathing crystals that do not exhibit the same self-assembly characteristics.
- Copper(I) trifluoromethanesulfonate with N-[4-(bromobenzylidene)-4H-1,2,4-triazol-4-amine can crystallize in open and closed forms, with the open form allowing for reversible sorption due to structural rearr
The shelf life of ASDs: 2. Predicting the shelf life at storage conditions.
Int J Pharm X
December 2023
TU Dortmund University, Department of Biochemical and Chemical Engineering, Laboratory of Thermodynamics, Emil-Figge-Str. 70, D-44227 Dortmund, Germany.
Amorphous solid dispersions (ASDs) are a widely used formulation technology for poorly water-soluble active pharmaceutical ingredients (API). Depending on the API-polymer combination and API load in the ASD, the amorphous API might be thermodynamically metastable and crystallize over time. The crystallization onset is one critical factor that can define the shelf life of the ASD.
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