Publications by authors named "P Goodrich"
Ammonium (NH ) concentration is critical to both nutrient availability and nitrogen (N) loss in soil ecosystems but can be highly variable across spatial and temporal scales. For this reason, effectively informing agricultural practices such as fertilizer management and understanding of mechanisms of soil N loss require sensor technologies to monitor ammonium concentrations in real time. Our work investigates the performance of fully printed ammonium ion-selective sensors used in diverse soil environments.
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- Researchers investigated the liquid structure of three common ionic liquids (ILs) using neutron scattering for the first time, focusing on [NTf] anions and different cations like [Cmim] and [P].
- The study found larger nonpolar nanodomains in ILs as the alkyl chain length increased, and it provided insights into cation-anion interactions, specifically the hydrogen bonding dynamics.
- With the introduction of a new data analysis package called Dissolve, the research validated findings across different models and reported a modified synthesis method for a specific IL, setting the stage for further exploration of the phosphonium ILs using neutron scattering.
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- Plant-available nitrogen, mainly as nitrate, is crucial for plant growth but can be harmful in excess, affecting ecosystems and human health.
- A new type of nitrate sensor has been developed, which uses printed potentiometric technology, featuring ion-selective and reference electrodes with polymeric membranes for better sensitivity and selectivity.
- The sensors were tested and showed a strong sensitivity to nitrate across a wide range of concentrations in both solutions and peat soil, although high levels of calcium affected their performance.
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- The study demonstrates the efficient production of cyclic carbonates via CO cycloaddition to epoxides using a C-scorpionate iron(II) complex as a catalyst in a specially designed ionic liquid medium.
- The process yields impressive results, achieving up to 98% yield at mild temperatures (80 °C) and pressures (1-8 bar), with a synergistic catalytic effect noted in the catalyst-ionic liquid system.
- The catalyst shows remarkable stability, maintaining its activity over ten cycles with only an 11% decrease in yield observed by the 11th cycle, marking a novel application of C-scorpionate complexes in ionic liquids for cyclic carbonate formation.
Combining results from impedance spectroscopy and oscillatory shear rheology, the present work focuses on the relation between the mass and charge flows and on how these are affected by the H-bonding in viscous ionic liquids (ILs). In particular, we compare the relaxational behaviors of the paradigmatic IL 1-ethyl-3-methylimidazolium bis(trifluoromethylsulfonyl)imide (EMIM-TFSI) and its OH-functionalized counterpart 1-(2-hydroxyethyl)-3-methylimidazolium bis(trifluoromethylsulfonyl)imide (OHEMIM-TFSI). Our results and their analysis demonstrate that the presence of cationic OH-groups bears a strong impact on the overall dynamics of OHEMIM-TFSI, although no signatures of suprastructural relaxation modes could be identified in their dielectric and mechanical responses.
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