2 research outputs found
Controllable Magnetism of CoO Nanoparticles Modified by the Reduced Graphene Oxide
Rocksalt CoO nanoparticles (CNPs)
have been prepared with a facile
solvothermal method. To control the magnetism of CNPs, the reduced
graphene oxide (RGO) is adopted to engineer the CNPs. Enwrapped by
the atomic-layered carbon sheets, the CNPs can be reduced locally.
The CoO/RGO composites were prepared by one-pot and two-pot synthetic
methods, respectively. Compared with the CoO/RGO raw composite that
have no magnetization hysteresis loop, the weak and the strong hysteresis
loops emerged successively via heating the particles at different
temperatures and maintaining their nanoscales. The magnetism can be
adjusted by controlling the temperature via two routes. By the one-pot
synthetic route, the CNPs can be reduced sharply, and an obvious hysteresis
is available around 400 °C, which is ascribed to the appearance
of Co nanoclusters decorated in the corners of CNPs. By the two-pot
synthetic route, a weak and gradually enhanced hysteresis can be observed,
and its magnetic properties should be ascribed to the topological
defects of RGO. Our findings have opened a new way to acquire nanoparticles
with controllable magnetism
Liquid Chromatography–Tandem Mass Spectrometry-Based Plasma Metabonomics Delineate the Effect of Metabolites’ Stability on Reliability of Potential Biomarkers
Metabonomics is an important platform for investigating the metabolites
of integrated living systems and their dynamic responses to changes
caused by both endogenous and exogenous factors. A metabonomics strategy
based on liquid chromatography–mass spectrometry/mass spectrometry
in both positive and negative ion modes was applied to investigate
the short-term and long-term stability of metabolites in plasma. Principal
components analysis and ten types of identified metabolites were used
to summarize the time-dependent change rules in metabolites systematically
at different temperatures. The long-term stability of metabolites
in plasma specimens stored at −80 °C for five years was
also studied. Analysis of these subjects identified 36 metabolites
with statistically significant changes in expression (<i>p</i> < 0.05) and found a kind of metabolite with a hundred-fold change.
The stability of metabolites in blood at 4 °C for 24 h was also
investigated. These studies show that a thorough understanding of
the effects of metabolite stability are necessary for improving the
reliability of potential biomarkers