4 research outputs found
Inhibitation of Cellular Toxicity of Gold Nanoparticles by Surface Encapsulation of Silica Shell for Hepatocarcinoma Cell Application
Nanotechnology,
as a double-edged sword, endows gold
nanoparticles (GNPs) more “power” in bioimaging and
theragnostics, whereas an outstanding issue associated with the biocompatibility
of GNPs should also be addressed. Especially for the silica-coated
gold nanospheres (GNSs) and gold nanorods (GNRs), there is increasing
attention to explore the application, because the surface silica encapsulation
has been proved to be an alternative strategy for other organic surface
coatings. However, among those reports there are very limited publications
to focus on the toxicity of silica-coated GNSs and GNRs. Besides,
the existing detoxification methods via surface chemistry on GNPs
greatly improve the biocompatibility but still undergo challenges
for high dose (>100 pM) demand and long-term stability. Here, we
demonstrated a straightforward, low-cost, universal strategy for the
surface chemistry on GNPs via silica encapsulating. Different size,
shape, dose, and surface capping of GNPs for the nanotoxicity test
have been carefully discussed. After silica encapsulating, the detoxification
for all GNPs presents significantly from HepG2 cell proliferation
results, especially for the GNRs. This new straightforward strategy
will definitely rationalize the biocompatibility issue of GNPs and
also provide potential for other surface chemistry methodology in
biomedical fields
Highly Controllable and Efficient Synthesis of Mixed-Halide CsPbX<sub>3</sub> (X = Cl, Br, I) Perovskite QDs toward the Tunability of Entire Visible Light
CsPbX<sub>3</sub> (X = Cl, Br, I) perovskite quantum dots (PQDs) have been intensively
investigated on photoelectric devices due to their superior optical
properties. To date, the stability of CsPbX<sub>3</sub> PQDs is still
an open challenge. The previous mixed-halide CsPbX<sub>3</sub> PQDs
were generally obtained via the anion-exchange method at 40 °C.
Here, the single- and mixed-halide CsPbX<sub>3</sub> PQDs are synthesized
at high temperature via the hot injection technique. The surface ligands
could thus be strongly coordinated onto the surface of the PQDs, which
dramatically improve the optical properties of the PQDs. The resulting
CsPbX<sub>3</sub> PQDs have high quantum yield (QY, 40–95%),
narrow full width at half-maximum (FWHM) (the narrowest FWHM <10
nm), tunable band gap (408–694 nm), and highly strong photostability.
The variation of their emission peaks upon anion atoms is well-supported
by the theoretical band gaps calculated by the density functional
theory calculations with the alloy formula correction. Hence, these
PQDs show great potential as good candidates for photoelectric devices
High-Performance All-Solid-State Polymer Electrolyte with Controllable Conductivity Pathway Formed by Self-Assembly of Reactive Discogen and Immobilized via a Facile Photopolymerization for a Lithium-Ion Battery
All-solid-state polymer electrolytes
(SPEs) have aroused great
interests as one of the most promising alternatives for liquid electrolyte
in the next-generation high-safety, and flexible lithium-ion batteries.
However, some disadvantages of SPEs such as inefficient ion transmission
capacity and poor interface stability result in unsatisfactory cyclic
performance of the assembled batteries. Especially, the solid cell
is hard to be run at room temperature. Herein, a novel and flexible
discotic liquid-crystal (DLC)-based cross-linked solid polymer electrolyte
(DLCCSPE) with controlled ion-conducting channels is fabricated via
a one-pot photopolymerization of oriented reactive discogen, polyÂ(ethylene
glycol)Âdiacrylate, and lithium salt. The experimental results indicate
that the macroscopic alignment of self-assembled columns in the DLCCSPEs
is successfully obtained under annealing and effectively immobilized
via the UV photopolymerization. Because of the existence of unique
oriented structure in the electrolytes, the prepared DLCCSPE films
exhibit higher ionic conductivities and better comprehensive electrochemical
properties than the DLCCSPEs without controlled ion-conductive pathways.
Especially, the assembled LiFePO<sub>4</sub>/Li cells with oriented
electrolyte show an initial discharge capacity of 164 mA h g<sup>–1</sup> at 0.1 C and average specific discharge capacities of 143, 135,
and 149 mA h g<sup>–1</sup> at the C-rates of 0.5, 1, and 0.2
C, respectively. In addition, the solid cell also shows the first
discharge capacity of 124 mA h g<sup>–1</sup> (0.2 C) at room
temperature. The outstanding cell performance of the oriented DLCCSPE
should be originated from the macroscopically oriented and self-assembled
DLC, which can form ion-conducting channels. Thus, combining the excellent
performance of DLCCSPE and the simple one-pot fabricating process
of the DLC-based all-solid-state electrolyte, it is believed that
the DLC-based electrolyte can be one of the most promising electrolyte
materials for the next-generation high-safety solid lithium-ion batteries
Covalently Assembled NIR Nanoplatform for Simultaneous Fluorescence Imaging and Photodynamic Therapy of Cancer Cells
A highly efficient multifunctional nanoplatform for simultaneous upconversion luminescence (UCL) imaging and photodynamic therapy has been developed on the basis of selective energy transfer from multicolor luminescent NaYF<sub>4</sub>:Yb<sup>3+</sup>,Er<sup>3+</sup> upconversion nanoparticles (UCNPs) to photosensitizers (PS). Different from popular approaches based on electrostatic or hydrophobic interactions, over 100 photosensitizing molecules were covalently bonded to every 20 nm UCNP, which significantly strengthened the UCNP–PS linkage and reduced the probability of leakage/desorption of the PS. Over 80% UCL was transferred to PS, and the singlet oxygen production was readily detected by its feature emission at 1270 nm. Tests performed on JAR choriocarcinoma and NIH 3T3 fibroblast cells verified the efficient endocytosis and photodynamic effect of the nanoplatform with 980 nm irradiation specific to JAR cancer cells. Our work highlights the promise of using UCNPs for potential image-guided cancer photodynamic therapy