Fully (99+ %) hydrolyzed poly(vinyl alcohol) (PVA) was electrospun from water using Triton X-100 surfactant to lower the surface tension. The diameter of the electrospun PVA fibers ranged from 100 to 700 nm. Treatment of the PVA fiber mats with methanol for 8 h stabilized the fibers against disintegration in contact with water. In addition, the mats showed increased mechanical strength due to increased crystallinity following post-spinning treatment with methanol. We suggest that methanol treatment serves to increase the degree of crystallinity, and hence the number of physical cross-links in the electrospun PVA fibers. This may occur by removal of residual water within the fibers by the alcohol, allowing PVA-water hydrogen bonding to be replaced by intermolecular polymer hydrogen bonding resulting in additional crystallization. Potential applications of electrospun PVA include filters, precursors to graphitic fibers, and biomedical materials.
3D N-doped graphene-CNT networks (NGCs) can be obtained by hydrothermal treatment, freeze-drying and subsequent carbonization of graphene oxide-dispersed pristine CNTs in the presence of pyrrole. The resulting NCGs used as a supercapacitor show high specific capacitance, good rate capability and still retain ∼96% of the initial capacitance even after 3000 cycles.
In this study, a
magnetothermodynamic (MTD) therapy is introduced
as an efficient systemic cancer treatment, by combining the magnetothermal
effect and the reactive oxygen species (ROS)-related immunologic effect,
in order to overcome the obstacle of limited therapeutic efficacy
in current magnetothermal therapy (MTT). This approach was achieved
by the development of an elaborate ferrimagnetic vortex-domain iron
oxide nanoring and graphene oxide (FVIOs-GO) hybrid nanoparticle as
the efficient MTD agent. Such a FVIOs-GO nanoplatform was shown to
have high thermal conversion efficiency, and it was further proved
to generate a significantly amplified ROS level under an alternating
magnetic field (AMF). Both in vitro and in
vivo results revealed that amplified ROS generation was the
dominant factor in provoking a strong immune response at a physiological
tolerable temperature below 40 °C in a hypoxic tumor microenvironment.
This was supported by the exposure of calreticulin (CRT) on 83% of
the 4T1 breast cancer cell surface, direct promotion of macrophage
polarization to pro-inflammatory M1 phenotypes, and further elevation
of tumor-infiltrating T lymphocytes. As a result of the dual action
of magnetothermal effect and ROS-related immunologic effect, impressive in vivo systemic therapeutic efficacy was attained at a
low dosage of 3 mg Fe/kg with two AMF treatments, as compared to that
of MTT (high dosage of 6–18 mg/kg under four to eight AMF treatments).
The MTD therapy reported here has highlighted the inadequacy of conventional
MTT that solely relies on the heating effect of the MNPs. Thus, by
employing a ROS-mediated immunologic effect, future cancer magnetotherapies
can be designed with greatly improved antitumor capabilities.
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