Medhat A. Shaibat

TL;DR: The detailed chemical structure of graphite oxide (GO), a layered material prepared from graphite almost 150 years ago and a precursor to chemically modified graphenes, has not been previously resolved because of the pseudo-random chemical functionalization of each layer, as well as variations in exact composition.

TL;DR: A molecular-level examination of sequence-specific secondary structures and supramolecular structures of a neurotoxic amyloid intermediate of the 40-residue β-amyloid peptide involved in Alzheimer's disease shows that Iβ shows higher toxicity than the fibril, indicating that the β-sheet formation may trigger neurotoxicity.

TL;DR: A solid-state NMR (SSNMR)-based structural modeling approach is presented on graphite oxide (GO), which is a prominent precursor and interesting benchmark system of modified graphene, and is likely to be applicable to other chemically modified graphenes and graphite-based systems.

TL;DR: It was theoretically and experimentally confirmed that the absolute sensitivity of 1H VFMAS for small paramagnetic complexes such as Cu(dl-alanine)2 can be an order of magnitude higher than that of equimolar diamagnetic ligands because of short 1H T1 of the paramagnetic systems and improved sensitivity under V FMAS.

TL;DR: It is demonstrated that MAS at a spinning speed of 20 kHz or higher greatly improves sensitivity and resolution in both (1)H and (13)C SSNMR for paramagnetic systems such as Cu(II)(DL-alanine)(2)H(2)O (Cu(DL-Ala)(2)) and Mn(acac)(3), for which the spectral dispersions due to ( 1)H hyperfine shifts reach 200 and 700 ppm, respectively.