quantification-polybutylene-adipate-terephthalate-based-micro-nano

Quantification of Polybutylene Adipate Terephthalate-based Micro- and Nano-plastics from Soil Using Proton Nuclear Magnetic Resonance Spectroscopy

A method to recover and quantify micro- and nano-plastics (MPs and NPs) formed in the soil during biodegradation is needed to accurately assess the ...

University of Tennessee-Knoxville

Stabilizing cubic polymorph of LiLaZrO at low temperatures is challenging and currently limited to mono- or dual-ion doping with aliovalent ions. Herein, a high-entropy strategy at the Zr sites was deployed to stabilize the cubic phase and lower the lithium diffusion activation energy, evident from the static Li and MAS Li NMR spectra.

Entropy stabilized cubic LiLaZrO with reduced lithium diffusion activation energy: studied using solid-state NMR spectroscopy.

Sub-Ångstrom-level porosity engineering, which is appealing in gas separations, has been demonstrated in solid carbon, polymer, and framework materials but rarely achieved in the liquid phase. In this work, a gas molecular sieving effect in the liquid phase at sub-5 Ångstrom scale is created via sophisticated porosity tuning in calixarene-derived porous liquids (PLs). Type II PLs are constructed via supramolecular complexation between the sodium salts of calixarene derivatives and crown ether solvents. The chemical structure variation and assembly behavior of the porous host upon PL construction are monitored by spectroscopy-, X-ray-, and neutron-scattering techniques. The presence of permanent porosity in calixarene-derived PLs is verified by pressure swing gas uptake, altered CO physisorption behavior, and molecular simulations. Sub-5 Ångstrom porosity tuning within the PL phase is achieved by introducing bulky substituted groups on the benzene ring of the calixarene host, which then greatly affects the dynamic motion and transport behavior of CO molecules and the Xe uptake performance. The approach being demonstrated in this work represents a promising pathway to tune and leverage the porosity effect for enhanced gas uptake capacity and selectivity in liquid sorbents.

Article	Year
Entropy stabilized cubic LiLaZrO with reduced lithium diffusion activation energy: studied using solid-state NMR spectroscopy. RSC advances\| PubMed ID: 37409041	2023
Sub-5 Ångstrom Porosity Tuning in Calixarene-Derived Porous Liquids via Supramolecular Complexation Construction. Angewandte Chemie (International ed. in English)\| PubMed ID: 39760709	2025

Carlos A. Steren

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