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Deep purification of perfluorinated electronic specialty gas with a scalable metal-organic framework featuring tailored positive potential traps.
Sci Bull (Beijing)
October 2024
Key Laboratory of Biomass Chemical Engineering of Ministry of Education, College of Chemical and Biological Engineering, Zhejiang University, Hangzhou 310027, China; Institute of Zhejiang University-Quzhou, Quzhou 324000, China. Electronic address:
Article Synopsis
- - The study focuses on the challenge of removing trace hexafluoropropylene (CF) to produce high-purity perfluoropropane, a vital gas for the electronics industry, due to limitations of traditional adsorbents.
- - Researchers employed a metal-organic framework (Al-PMA) that leverages aperture size and electrostatic potential to selectively bind CF while blocking larger molecules, supported by advanced spectroscopy techniques.
- - Breakthrough experiments showed Al-PMA successfully purifies CF to over 99.999% under normal conditions, highlighting its promising scalability and stability for industrial applications.
Densification of sodium and magnesium aluminosilicate glasses at ambient temperature: structural investigations by solid-state nuclear magnetic resonance and molecular dynamics simulations.
Phys Chem Chem Phys
November 2024
Instituto de Física de São Carlos, Universidade de São Paulo, Avenida Trabalhador São-carlense 400, São Carlos, SP 13566-590, Brazil.
Sodium and magnesium aluminosilicate glasses with compositions 20NaO-20AlO-60SiO (NAS) and 20MgO-20AlO-60SiO (MAS) were subjected to a 12 and 25 GPa compression and decompression at room temperature, resulting in density increases from 3.7% to 5.3% (NAS) and from 8.
View Article and Find Full Text PDFNature of Reactive Sites in TS-1 from N Solid-State NMR and Ti K-Edge X-Ray Absorption Spectroscopic Signatures Upon Pyridine Adsorption.
J Am Chem Soc
October 2024
Department of Chemistry and Applied Biosciences, ETH Zurich, Vladimir-Prelog-Weg 2 Zurich 8093, Switzerland.
Ti-containing zeotypes, notably titanosilicalite-1 (TS-1), are prominent examples of heterogeneous catalysts that have found applications in selective oxidation processes with hydrogen peroxide. Despite extensive characterization studies including using various probe molecules to interrogate the nature and the local environment of Ti sites, their detailed structure (as well as reactivity) remains elusive. Here, we demonstrate that using low temperature N magic angle spinning (MAS) ssNMR spectroscopy of adsorbed pyridine on TS-1 combined with Ti K-edge XANES on a range of samples (dehydrated, hydrated, contacted with HO and pyridine) provides unique information regarding the Ti sites, highlighting their reactivity and dynamic nature.
View Article and Find Full Text PDFUncovering the Pathway of Serine Octamer Magic Number Cluster Formation during Electrospray Ionization: Experiments and Simulations.
J Am Chem Soc
October 2024
Department of Chemistry, The University of Western Ontario, London, Ontario N6A 5B7, Canada.
Electrospray ionization (ESI) of serine (Ser) solution generates SerH as an abundant magic number cluster. ESI clustering of most other solutes yields nonspecific stoichiometries. It is unclear why SerH dominates in the case of Ser, and how SerH forms during ESI.
View Article and Find Full Text PDFBridge Nodes Linking Depression and Medication Taking Self-Efficacy Dimensions Among Persons With HIV: A Secondary Data Analysis.
AIDS Behav
January 2025
Columbia University School of Nursing, 560 W 168 St, New York, NY, 10032, USA.
Depression and low medication taking self-efficacy are among the most important mechanisms contributing to poor adherence to treatment and care for persons with HIV (PWH). While the overall negative relationship between depression and medication taking self-efficacy has been well established, little is known on the precise pathways linking depression and medication taking self-efficacy. Thus, it is critical to identify a specific item of depression and medication taking self-efficacy that derives the overall negative relationship.
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