In its nanoparticulate form, corundum (α-AlO) could lead to several applications. However, its production into nanoparticles (NPs) is greatly hampered by the high activation energy barrier for its formation from cubic close-packed oxides and the sporadic nature of its nucleation. We report a simple synthesis of nanometer-sized α-AlO (particle diameter ~13 nm, surface areas ~140 m g) by the mechanochemical dehydration of boehmite (γ-AlOOH) at room temperature. This transformation is accompanied by severe microstructural rearrangements and might involve the formation of rare mineral phases, diaspore and tohdite, as intermediates. Thermodynamic calculations indicate that this transformation is driven by the shift in stability from boehmite to α-AlO caused by milling impacts on the surface energy. Structural water in boehmite plays a crucial role in generating and stabilizing α-AlO NPs.
Download full-text PDF |
Source |
|---|---|
| http://dx.doi.org/10.1126/science.aaw9377 | DOI Listing |
Publication Analysis
Top Keywords
Similar Publications
Sensing Platform Based on Gold Nanoclusters and Nanoporous Anodic Alumina for Preeclampsia Detection.
Biosensors (Basel)
December 2024
Department of Electronics, Electric, and Automatic Engineering, Rovira I Virgili University (URV), 43007 Tarragona, Spain.
Preeclampsia is a pregnancy-specific hypertensive syndrome recognized as the leading cause of maternal and fetal morbidity worldwide. Early diagnosis is crucial for mitigating its adverse effects, and recent investigations have identified endoglin as a potential biomarker for this purpose. Here, we present the development of a hybrid biosensor platform for the ultrasensitive detection of endoglin, aimed at enabling the early diagnosis of preeclampsia.
View Article and Find Full Text PDFA magnetic dual-aptamer electrochemical sensor with MOF-on-MOF-derived electrocatalyst as a signal amplifier for sensitive detection of cardiac troponin I.
Talanta
February 2025
Ministry of Education Key Laboratory for the Synthesis and Application of Organic Functional Molecules, Collaborative Innovation Center for Advanced Organic Chemical Materials Co-Constructed by the Province and Ministry, College of Chemistry and Chemical Engineering, Hubei University, 430062, Wuhan, China. Electronic address:
Considering the close association between cardiac troponin I (cTnI) level and various cardiovascular diseases, it becomes essential to explore sensitive and accurate detection methods for monitoring their levels in the early stages of disease. In this work, a magnetic dual-aptamer electrochemical sensor for cTnI detection was constructed in the first utilizing MOF-on-MOF-derived electrocatalyst as a signal amplifier in collaboration with high-efficient separation of magnetic beads (MBs). Employing zeolitic imidazolate framework-67 (ZIF-67) with high surface area as host MOF, MOF-on-MOF heterostructure (ZIF-67@PBA) was facilely prepared by in-situ growth of conductive prussian blue analogue (PBA) as guest MOF onto the surface of ZIF-67 with a simple ion-exchange method.
View Article and Find Full Text PDFSorbent selection for the recovery of gallium and indium from aqueous solutions: a sustainable approach to the recovery of strategic metals from LED lamps.
Environ Sci Pollut Res Int
October 2024
Department of Chemical and Materials Engineering (CyPS Research Group), School of Chemical Sciences, Universidad Complutense de Madrid, 28040, Madrid, Spain.
Gallium and indium, metals present in light-emitting diode (LED) lighting technology, can be effectively recovered from aqueous solutions by sorption. For this purpose, carbonaceous materials, such as activated carbon, or low-cost biosorbents as beer bagasse, spent coffee grounds or peanut shells, and a low-cost zeolite as chabazite, were characterized by BET, FTIR, XRD, and SEM analysis prior use. Protonated chabazite, with high surface area (505 m/g) and a Si/Al molar ratio of 3.
View Article and Find Full Text PDFHighly efficient mesoporous aluminium-magnetite-alginate magnetic composite for defluoridation of water.
Environ Res
November 2024
Department of Chemistry, R.T.M. Nagpur University, Nagpur, 440033, India. Electronic address:
One of the few elements that can have negative health impacts in both conditions, when consumed in excess or insufficiency is fluoride. In current study, aluminium magnetite alginate composite (AMA) was fabricated and applied using batch adsorption of fluoride as well as by using statistical modelling. Heterogeneous surface as revealed from scanning electron micrograph, thermal stability shown by thermal studies, high surface area of 29.
View Article and Find Full Text PDFBiodiesel production from sewage sludge using supported heteropolyacid as heterogeneous acid catalyst.
J Environ Manage
August 2024
Catalysis, Reactors and Control Research Group (CRC), Dep. of Chemical and Environ. Engineering, University of Oviedo, Faculty of Chemistry, Julián Clavería S/n, 33006, Oviedo, Spain. Electronic address:
Phosphotungstic acid (HPW) and silicotungstic acid (HSiW) were tested as homogeneous and as heterogeneous catalysts (after immobilized on different supports as high surface area graphite -HSAG500-, montmorillonite -MMT- and alumina -AlO-) for the in situ transesterification of sewage sludge lipids. Both catalysts exhibited similar performance in homogeneous phase, with slightly higher biodiesel yield for HPW. When the different supports were tested with HPW, the maximum yield obtained follow the trend: MMT > HSAG500 > AlO, but a greater leaching of the heteropolyacid (HPA) was observed with MMT.
View Article and Find Full Text PDFWant AI Summaries of new PubMed Abstracts delivered to your In-box?
Enter search terms and have AI summaries delivered each week - change queries or unsubscribe any time!