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Disentangling the Relationship Between Urinary Metal Exposure and Osteoporosis Risk Across a Broad Population: A Comprehensive Supervised and Unsupervised Analysis.
Toxics
November 2024
Medical School, Southeast University, Nanjing 210096, China.
: Limited evidence links urinary metal exposure to osteoporosis in broad populations, prompting this study to cover this knowledge gap using supervised and unsupervised approaches. : This study included 15,923 participants from the National Health and Nutrition Examination Survey (NHANES) spanning from 1999 to 2020. Urinary concentrations of nine metals-barium (Ba), cadmium (Cd), cobalt (Co), cesium (Cs), molybdenum (Mo), lead (Pb), antimony (Sb), thallium (Tl), and tungsten (Tu)-were measured using inductively coupled plasma mass spectrometry (ICP-MS).
View Article and Find Full Text PDFA twofold interpenetrated three-dimensional barium(II) metal-organic framework constructed from 2,2'-[terephthaloylbis(azanediyl)]diacetate: synthesis, structure, dihydrogen bonding and spectroscopic properties.
Acta Crystallogr C Struct Chem
January 2025
College of Chemistry and Materials Science, Anhui Normal University, Wuhu, Anhui 241000, People's Republic of China.
A new twofold interpenetrated 3D metal-organic framework (MOF), namely, poly[[μ-aqua-diaqua{μ-2,2'-[terephthaloylbis(azanediyl)]diacetato}barium(II)] dihydrate], {[Ba(CHNO)(HO)]·2HO}, (I), has been assembled through a combination of the reaction of 2,2'-[terephthaloylbis(azanediyl)]diacetic acid (TPBA, HL) with barium hydroxide and crystallization at low temperature. In the crystal structure of (I), the nine-coordinated Ba ions are bridged by two μ-aqua ligands and two carboxylate μ-O atoms to form a 1D loop-like Ba-O chain, which, together with the other two coordinated water molecules and μ-carboxylate groups, produces a rod-like secondary building unit (SBU). The resultant 1D polynuclear SBUs are further extended into a 3D MOF via the terephthalamide moiety of the ligand as a spacer.
View Article and Find Full Text PDFEffect of boron oxide on stability of high-ferrite Portland cement clinker in low-temperature calcination.
Sci Rep
December 2024
Huaxin Cement Co., Ltd, Huaxin Building, No. 426, Gaoxin Avenue, Donghu New Technology Development Zone, Wuhan, 430070, China.
Article Synopsis
- The study examines the difficulties of producing high-ferrite Portland cement clinker at low temperatures and investigates boron oxide as a potential stabilizing agent.
- Researchers found that at 1350 °C, the HFPC clinker suffers from severe pulverization due to a metastable phase, prompting the exploration of various stabilizers.
- While multiple agents showed promise, boron oxide emerged as the best option, with a maximum recommended content of 1% to avoid destabilization that impacts early strength development, highlighting a pathway to lower energy use and emissions in cement production.
Phosphorus-containing polycarbosilazanes: synthesis dehydrocoupling catalysis and flame-retardant properties.
Dalton Trans
December 2024
Univ Rennes, CNRS, ISCR (Institut des Sciences Chimiques de Rennes) - UMR 6226, F-35000 Rennes, France.
The barium complex [Ba{N(SiMe)}] has been used to catalyse the dehydropolymerisation of the phosphine-functionalised hydrosilane 4-PhP-CHSiH (A) with the α,ω-diamine 1,4-(CHNHMe)-CH (C), for the production of -[Si(4-CHPPh)H-N(Me)CH-CH-CHN(Me)]- polycarbosilazanes that contain dangling phosphino groups along the polymer backbone. The comonomers A and C, specifically prepared for this purpose and comprehensively characterised, lend themselves well to barium-promoted dehydrocoupling catalysis. They allow for the formation of linear, amine-capped polymers with molecular weights in the range 4000-8000 g mol, as estimated by DOSY and H end-group NMR analyses.
View Article and Find Full Text PDFCharacterisation of the electronic ground states of BaH and BaD by high-resolution photoelectron spectroscopy.
Phys Chem Chem Phys
December 2024
Institute of Molecular Physical Sciences, ETH Zurich, CH-8093 Zurich, Switzerland.
The rovibrational energy-level structures of BaH and BaD in their XΣ electronic ground state have been characterised by pulsed-field-ionisation zero-kinetic-energy photoelectron spectroscopy following resonance-enhanced (1 + 1') two-photon excitation from the BaH/BaD X Σ ground state the E Π (' = 0, 1) intermediate levels. A full set of rovibrational molecular constants for the BaH and BaD ground states has been derived for the first time and the adiabatic ionisation energies of BaH and BaD were determined to be 38 679.96(20) and 38 652.
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