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In situ carbon isotopic analyses of magnesium-rich carbonates by LA-MC-ICP-MS at low mass resolution using an iterative isobaric interference correction.
Talanta
December 2024
State Key Laboratory of Geological Processes and Mineral Resources, China University of Geosciences, Wuhan, 430074, China. Electronic address:
Accurate in situ carbon isotopic measurements of magnesium-rich carbonates using LA-MC-ICP-MS require effective correction for isobaric interference, particularly from doubly charged Mg ions that can induce δC deviations of several permil. This study focuses on optimizing gas parameters and developing robust correction strategies to improve the accuracy of δC measurements. Experimental results demonstrate that the introduction of nitrogen gas at a flow rate of 4-6 mL/min effectively doubles signal sensitivity while optimizing low helium (0.
View Article and Find Full Text PDFDetection of Regulated Ergot Alkaloids in Food Matrices by Liquid Chromatography-Trapped Ion Mobility Spectrometry-Time-of-Flight Mass Spectrometry.
J Vis Exp
November 2024
Department of Analytical Chemistry, Faculty of Sciences, University of Granada;
Ion mobility mass spectrometry (IMS) acts as an additional separation dimension when integrated into liquid chromatography-mass spectrometry (LC-MS) workflows. LC-IMS-MS methods provide higher peak resolution, enhanced separation of isobaric and isomeric compounds, and improved signal-to-noise ratio (S/N) compared to traditional LC-MS methods. IMS provides another molecular characteristic for the identification of analytes, namely the collision cross section (CCS) parameter, reducing false positive results.
View Article and Find Full Text PDFTesting the Ce Limit of Mass Bias Correction Using Nd/Nd as Normalizing Ratio in Radiogenic Neodymium Isotope Analysis by MC-ICP-MS.
Rapid Commun Mass Spectrom
February 2025
Institute for Chemistry and Biology of the Marine Environment (ICBM), School of Mathematics and Science, Carl von Ossietzky Universität Oldenburg, Oldenburg, Germany.
Rationale: Neodymium isotopes are a powerful geochemical tool that has widely been used in terrestrial and extraterrestrial studies. Modern multicollector inductively coupled plasma mass spectrometers (MC-ICP-MS) allow fast, accurate, and precise analysis of the radiogenic Nd isotope ratio Nd/Nd. These analyses comprise relatively high instrumental mass bias that is typically corrected for using the stable Nd/Nd of 0.
View Article and Find Full Text PDFIncrease in Auxeticity Due to the Presence of a Disordered Crystalline Phase of Hard Dumbbells Within the Nanolayer-Nanochannel Inclusion Introduced to the f.c.c. Hard Sphere Crystal.
Materials (Basel)
November 2024
Institute of Molecular Physics, Polish Academy of Sciences, M. Smoluchowskiego 17, 60-179 Poznań, Poland.
To obtain materials or metamaterials with desired elastic properties that are tailor-made for a particular application, it is necessary to design a new material or composite (which may be cumbersome) or to modify the structure of existing materials in order to change their properties in the desired direction. The latter approach, although also not easy, seems favourable with respect to parameters like costs and time-to-market. Despite the fact that elastic properties are one of the oldest studied physical parameters of matter, our understanding of the processes at the microstructural level, that are behind these properties, is still far from being complete.
View Article and Find Full Text PDFStudy of PVAc/EVA polymer series: Influence of the inter-/intra-molecular interaction ratio on the molecular mobility at the glass transition.
J Chem Phys
November 2024
Univ. Rouen Normandie, INSA Rouen Normandie, CNRS, Normandie Univ., GPM UMR 6634, F-76000 Rouen, France.
Article Synopsis
- The study focused on the molecular mobility during the glass transition of poly(vinyl acetate) (PVAc) and poly(ethylene-co-vinyl acetate) (EVA) by analyzing how temperature and pressure affect intermolecular interactions.
- Researchers used time-temperature-pressure superpositions and relaxation time dispersion to assess the impact of the vinyl acetate (VAc) ratio on molecular interactions and cooperative behavior.
- Results showed that the thermal and volumetric contributions to isobaric fragility vary based on the VAc ratio and pressure, highlighting the significant role of the dipolar pendant groups in these interactions.
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