Varying formulations in the glass system of 40P O ─(24 - x)MgO─(16 + x)CaO─(20 - y)Na O─yTiO (where 0 ≤ x ≤ 22 and y = 0 or 1) were prepared via melt-quenching. The structure of the glasses was confirmed by X-ray diffraction (XRD), Fourier transform infrared (FTIR), micro Raman and solid-state nuclear magnetic resonance (NMR) spectroscopies. The thermal properties and the activation energy of crystallization (E ) were measured using thermal analysis and the Kissinger equation, respectively. The glass forming ability of the formulations investigated was seen to decrease with reducing MgO content down to 8 mol% and the glass stability region also decreased from 106 to 90°C with decreasing MgO content. The activation energy of crystallization (E ) values also decreased from 248 (for 24 mol% MgO glass) to 229 kJ/mol (for the 8 mol% MgO content) with the replacement of MgO by CaO for glasses with no TiO . The formulations containing less than 8 mol% MgO without TiO showed a strong tendency toward crystallization. However, the addition of 1 mol% TiO in place of Na O for these glasses with less than 8 mol% MgO content, inhibited their crystallization tendency. Glasses containing 8 mol% MgO with 1 mol% TiO revealed a 12°C higher glass transition temperature, a 14°C increase in glass stability against crystallization and a 38 kJ/mol increase in E in comparison to their non TiO containing counterpart. NMR spectroscopy revealed that all of the formulations contained almost equal percentages of Q and Q species. However, FTIR and Raman spectroscopies showed that the local structure of the glasses had been altered with addition of 1 mol% TiO , which acted as a network modifier, impeding crystallization by increasing the cross-linking between phosphate chains and consequently leading to increased E as well as their glass forming ability.
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http://dx.doi.org/10.1002/jbm.b.34421 | DOI Listing |
Environ Sci Technol
December 2024
State Key Laboratory for Biology of Plant Disease and Insect Pests, Institute of Plant Protection, Chinese Academy of Agricultural Sciences, Beijing 100193, China.
Chemical control of head blight (FHB) in wheat plants is often challenged by the resistance outbreak and deoxynivalenol (DON) accumulation. Developing green partners for fungicides is crucial for reducing fungal growth, mycotoxin contamination, and agricultural fungicides input. Herein, we investigated the mechanism of MgO nanoparticles (NPs) in controlling FHB.
View Article and Find Full Text PDFJ Environ Manage
December 2024
Key Laboratory of Novel Biomass-Based Environmental and Energy Materials in Petroleum and Chemical Industry, Engineering Research Center of Phosphorus Resources Development and Utilization of Ministry of Education, School of Environmental Ecology and Biological Engineering, Wuhan Institute of Technology, Wuhan 430205, China; Hubei Three Gorges Laboratory, Yichang 443007, China. Electronic address:
Lead (Pb) contamination is an inevitable consequence of phosphate mining, necessitating the development of effective remediation strategies. This study investigated the use of CaO/MgO-modified okara (CMS) as an eco-friendly approach to remediate Pb-contaminated soils from phosphate mining wastelands. In the present study, following 30 d of CMS application, the exchangeable Pb content was significantly decreased to 10.
View Article and Find Full Text PDFMaterials (Basel)
December 2024
Department of Civil Engineering, Toronto Metropolitan University, Toronto, ON M5B 2K3, Canada.
This study presents a comprehensive assessment of the fresh state, rheological, and mechanical properties of alkali-activated mortars (AAMs) developed by incorporating magnesium oxide (MgO) and nanomaterials. A total of 24 AAM mixes with varying content of MgO, multi-walled carbon nanotube (MWCNT), and reduced graphene oxide (rGO) were developed following the one-part dry mix technique using powder-based activators/reagents. The effects of the types/combinations of source materials (binary or ternary)/reagents, MgO (0 to 5%), MWCNT (0 to 0.
View Article and Find Full Text PDFPlant Foods Hum Nutr
December 2024
Department of Food, Environmental and Nutritional Sciences (DeFENS), University of Milan, Milan, 20133, Italy.
Raisin can be used a substitution of artificially sweetened snacks/ingredients, in order to counteract the increasing consumption of sugar-added foods, which is associated to adverse health effects. The aim of this study was to investigate the phenolic content, reducing capacity and antiglycation activities of traditional, sun-dried raisin samples obtained from six Tunisian varieties. Total phenolics were determined by the Folin Ciocalteu assay, proanthocyanidins by depolymerisation with n-butanol/HCl, monomeric and dimeric flavanols, flavonols and anthocyanins by HPLC with diode array and fluorimetric detectors.
View Article and Find Full Text PDFJ Hazard Mater
November 2024
College of Plant Protection, Shandong Agricultural University, Taian 271018, Shandong province, China. Electronic address:
The harmful influence caused by cadmium (Cd) to agriculture is severe and enduring. Efforts to reduce the damage by Cd to crop is an important topic. In this study, we investigated the effect of MgO NPs on tobacco seedlings' growth under Cd stress and explored its mechanism.
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