3 research outputs found
Aerosol Synthesis of Vanadium Oxide-Carbon Hybrid Nanoparticle Clusters for High-Performance Lithium Extraction via Electrochemical Deionization
An aerosol-based synthetic approach
is demonstrated for the development
of vanadium oxide-carbon hybrid nanoparticle clusters (VOx-C-NPCs) used for the fabrication of a unique electrochemical
deionization (ECDI) cell. Hybrid ECDI cells are constructed with a
positive electrode of pseudocapacitive VOx-C-NPCs and a negative electrode of battery-like silver–carbon
nanoparticle clusters (Ag-C-NPCs). The reversible extraction of Li+ ions and the storage of Cl– ions are conducted
through Faradaic reactions on VOx-C-NPCs
and Ag-C-NPCs, respectively. The surface of the VOx-C-NPC electrodes can be successfully protected by an anion-doped
polypyrrole (PPy) film, by which the structural stability of VOx-C-NPC, in terms of the salt adsorption capacity
(SAC) retention, is enhanced to 92%. Remarkably high SAC values of
the hybrid ECDI cells are achievable in comparison to the reported
values in the field: up to 27.5 mg/g for the bare VOx-C//Ag-C cell and 49.3 mg/g for the PPy-protected VOx-C//Ag-C cell. This work provides a prototype study
for the rapid and continuous production of high-performance VOx-C-NPCs using aerosol-based synthesis supported
by complementary material characterization. The mechanistic understanding
of the material synthesis and the corresponding ECDI process shows
promise for achieving an optimal deionization performance in terms
of SAC and stability
Unprecedented 8,9′-Neolignans: Enantioselective Synthesis of Possible Stereoisomers for Structural Determination
(+)-Wutaienin (<b>3</b>) and
its C-7 methyl ether (<b>4</b>), isolated from <i>Zanthoxylum
wutaiense</i>, were found to be unprecedented 8,9′-neolignans
containing an (<i>S</i>)-2-(1,1-dimethyl-1-hydroxymethyl)-7-methoxydihydroÂbenzofuran
skeleton. Wutaienin (<b>3</b>) was present in the plant as an
inseparable 1:1 mixture of the (7,8)-<i>syn</i>-diastereoisomers.
The diastereoisomeric mixture was characterized by comparison with
four possible diastereoisomers, which were enantioselectively synthesized
from (<i>S</i>)-5-bromo-(1,1-dimethyl-1-hydroxymethyl)-7-methoxydihydroÂbenzofuran
using Evans’ oxazolidinone-assisted asymmetric aldol condensation
to install the chiral centers at the C-7 and C-8 positions
Secondary Metabolites from the Roots of <i>Neolitsea daibuensis</i> and Their Anti-inflammatory Activity
Bioassay-guided fractionation of the roots of <i>Neolitsea
daibuensis</i> afforded three new β-carboline alkaloids,
daibucarbolines A–C (<b>1</b>–<b>3</b>),
three new sesquiterpenoids, daibulactones A and
B (<b>4</b> and <b>5</b>) and daibuoxide (<b>6</b>), and 20 known compounds. The structures of <b>1</b>–<b>6</b> were determined by spectroscopic analysis and single-crystal
X-ray diffraction. Daibucarboline A (<b>1</b>), isolinderalactone
(<b>7</b>), 7-<i>O</i>-methylnaringenin (<b>8</b>), and prunetin (<b>9</b>) exhibited moderate iNOS inhibitory
activity, with IC<sub>50</sub> values of 18.41, 0.30, 19.55, and 10.50
ÎĽM, respectively