2022 Conference Hub

Chuanyu Yan – @yan_chuanyu

The liquid-solid interface is of great importance in fundamental and applied research. However, the in-situ characterization of liquid-solid interfaces is very challenging. In this work, we demonstrated that {1H–29Si-}1H multiple-contact cross polarization with indirect detection (MCPi) solid-state nuclear magnetic resonance (ssNMR) spectroscopy is an excellent tool for studying dehydration and deuterium exchange at the solvent-silica interface.

Yady Senayda Garcia Castillo – @yadygarcia89

Composites between OIPCs and polymer particles have recently been of interest because they combine the non-flammability, non-volatility, plasticity, electrochemical, and thermal stability of OIPCs, while at the same offering the mechanical stability provided by the polymer. ssNMR is implemented to study the structural changes and ions dynamics and is correlated with Electrochemical Impedance Spectroscopy (EIS) to determine the ion transport in the composite. It is expected that the composite will take advantage of the intrinsic properties of the OIPC like plasticity, the mechanical strength of the polymer, and the formation of the interphase between them, which will add new properties.

Riley W. Hooper – @rileyhooper97

Halogen NMR and NQR spectroscopy is often challenging due to large quadrupole moments for the NMR-active nuclei of Cl, Br, and I. Nevertheless, these nuclei can provide invaluable structural and dynamic information for materials. We have studied two such examples of lead-bromide materials via 79/81Br NMR and NQR spectroscopy.

Racha Bayzou – @RBayzou

Amorphous LiPON thin-films are the standard electrolytes for all-solid microbatteries. They are prepared by the radiofrequency sputtering from Li3PO4 targets under a pure N2 atmosphere. In this work, we elucidate the relationships between deposition conditions and local atomic-level structure using 31P, 7Li and 14N solid-state NMR.

Hongtao Qu – @QuHongtao

We investigate the impact of Al incorporation on the structure and dynamics of Al-doped lithium thiophosphates (Li3-3xAlxPS4) based on β-Li3PS4. 27Al and 6Li MAS NMR spectra confirm that Al3+ ions occupy octahedral sites in the structure. Quantitative analyses of 27Al NMR that the maximum Al incorporation is x=0.06 in Li3-3xAlxPS4. NMR relaxometry shows that the activation barrier for long-range Li ion diffusion in β-Li3PS4 hardly changes upon Al incorporation, but the onset temperature for doping comes down significantly. The activation barrier in the subsequently formed multiphase material decreases significantly, however, indicating a different more efficient Li ion conduction pathways.

Mariana Coelho Santoro – @marianacsantoro

This work describes a solid-state 31P NMR investigation of the chemical nature of adsorbed phosphate groups in Ca/Mg modified biochars. Biomass was used to synthesise steam-activated biochars, followed by precipitation of Ca or Mg metals for later adsorption of phosphates from phosphate-rich solutions, aiming the obtention of a material with bioavailable phosphate forms to be used as slow-release fertilisers. The 31P NMR results showed that the Mg/modified biochars had a higher phosphate adsorption capacity. Also, signals with distinct chemical shifts and linewidths were observed in the spectra of samples immersed in different phosphate solutions.