scholarly journals A new automated method for high throughput carbon and hydrogen isotope analysis of gaseous and dissolved methane at atmospheric concentrations

2021 ◽  
Author(s):  
Andrew C. Smith ◽  
Steve Welsh ◽  
Helen Atkinson ◽  
David Harris ◽  
Melanie J. Leng
Keyword(s):  
High Throughput ◽  
Hydrogen Isotope ◽  
Isotope Analysis ◽  
Dissolved Methane ◽  
Automated Method ◽  
Atmospheric Concentrations ◽  
Carbon And Hydrogen Isotope

Carbon and hydrogen isotope analysis of parathion for characterizing its natural attenuation by hydrolysis at a contaminated site

2018 ◽  
Vol 143 ◽  
pp. 146-154 ◽  
Author(s):  
Langping Wu ◽  
Dipti Verma ◽  
Morten Bondgaard ◽  
Anja Melvej ◽  
Carsten Vogt ◽  
...  
Keyword(s):  
Natural Attenuation ◽  
Hydrogen Isotope ◽  
Isotope Analysis ◽  
Contaminated Site ◽  
Carbon And Hydrogen Isotope

Elucidating the Weakly Reversible Cs-Pb-Br Perovskite Nanocrystal Reaction Network with High-Throughput Maps and Transformations

2020 ◽  
Author(s):  
Jakob Dahl ◽  
Xingzhi Wang ◽  
Xiao Huang ◽  
Emory Chan ◽  
Paul Alivisatos
Keyword(s):  
High Throughput ◽  
Dynamic Equilibrium ◽  
Reaction Network ◽  
Substantial Impact ◽  
Equilibrium Behavior ◽  
Automated Method ◽  
Lead Bromide ◽  
Different Shapes ◽  
Complex Chemistry ◽  
Lead Halide

<p>Advances in automation and data analytics can aid exploration of the complex chemistry of nanoparticles. Lead halide perovskite colloidal nanocrystals provide an interesting proving ground: there are reports of many different phases and transformations, which has made it hard to form a coherent conceptual framework for their controlled formation through traditional methods. In this work, we systematically explore the portion of Cs-Pb-Br synthesis space in which many optically distinguishable species are formed using high-throughput robotic synthesis to understand their formation reactions. We deploy an automated method that allows us to determine the relative amount of absorbance that can be attributed to each species in order to create maps of the synthetic space. These in turn facilitate improved understanding of the interplay between kinetic and thermodynamic factors that underlie which combination of species are likely to be prevalent under a given set of conditions. Based on these maps, we test potential transformation routes between perovskite nanocrystals of different shapes and phases. We find that shape is determined kinetically, but many reactions between different phases show equilibrium behavior. We demonstrate a dynamic equilibrium between complexes, monolayers and nanocrystals of lead bromide, with substantial impact on the reaction outcomes. This allows us to construct a chemical reaction network that qualitatively explains our results as well as previous reports and can serve as a guide for those seeking to prepare a particular composition and shape. </p>

scholarly journals Oxygen and hydrogen isotope analysis of experimentally generated magmatic and metamorphic aqueous fluids using laser spectroscopy (WS-CRDS)

2021 ◽  
pp. 120487
Author(s):  
Juliana Troch ◽  
Stéphane Affolter ◽  
Chris Harris ◽  
Stefano M. Bernasconi ◽  
Markus Leuenberger
Keyword(s):  
Laser Spectroscopy ◽  
Hydrogen Isotope ◽  
Isotope Analysis
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