Functional MR imaging can demonstrate the CNS pathway for acupuncture stimulation. Acupuncture at ST.36 and LI.4 activates structures of descending antinociceptive pathway and deactivates multiple limbic areas subserving pain association. These findings may shed light on the CNS mechanism of acupuncture analgesia and form a basis for future investigations of endogenous pain modulation circuits in the human brain.
Healable antifouling films are fabricated by the exponential layer-by-layer assembly of PEGylated branched poly(ethylenimine) and hyaluronic acid followed by post-crosslinking. The antifouling function originates from the grafted PEG and the extremely soft nature of the films. The rapid and multiple healing of damaged antifouling functions caused by cuts and scratches can be readily achieved by immersing the films in normal saline solution.
Sub-5 nm ultra-fine iron phosphide
(FeP) nano-dots-modified porous graphitic carbon nitride (g-C3N4) heterojunction nanostructures are successfully
prepared through the gas-phase phosphorization of Fe3O4/g-C3N4 nanocomposites. The incorporation
of zero-dimensional (0D) ultra-small FeP nanodots co-catalysts not
only effectively facilitate charge separation but also serve as reaction
active sites for hydrogen (H2) evolution. Herein, the strongly
coupled FeP/g-C3N4 hybrid systems are employed
as precious-metal-free photocatalysts for H2 production
under visible-light irradiation. The optimized FeP/g-C3N4 sample displays a maximum H2 evolution rate
of 177.9 μmol h–1 g–1 with
the apparent quantum yield of 1.57% at 420 nm. Furthermore, the mechanism
of photocatalytic H2 evolution using 0D/2D FeP/g-C3N4 heterojunction interfaces is systematically
corroborated by steady-state photoluminescence (PL), time-resolved
PL spectroscopy, and photoelectrochemical results. Additionally, an
increased donor density in FeP/g-C3N4 is evidenced
from the Mott–Schottky analysis in comparison with that of
parent g-C3N4, signifying the enhancement of
electrical conductivity and charge transport owing to the emerging
role of FeP. The density functional theory calculations reveal that
the FeP/g-C3N4 hybrids could act as a promising
catalyst for the H2 evolution reaction. Overall, this work
not only paves a new path in the engineering of monodispersed FeP-decorated
g-C3N4 0D/2D robust nanoarchitectures but also
elucidates potential insights for the utilization of noble-metal-free
FeP nanodots as remarkable co-catalysts for superior photocatalytic
H2 evolution.
Colloidally synthesized Ni12P5 nanoparticles were embedded into g-C3N4 nanosheets via a solution-phase approach. The Ni12P5/g-C3N4 photocatalysts manifested significantly improved noble-metal-free H2 evolution.
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