13 research outputs found
Data used in the Paper
The file includes,concentration, time, temperature, Langmuir, Contact Angle, Lo CR and Log CR versus
Highly (001)-Textured Tetragonal BiFeO<sub>3</sub> Film and Its Photoelectrochemical Behaviors Tuned by Magnetic Field
Highly (001)-textured
BiFeO<sub>3</sub> film in tetragonal phase (T-BFO) with a giant c/a
ratio was first obtained on quartz/polycrystalline ITO substrate.
Our results indicate that the polycrystalline ITO layer with small
surface roughness is a critical point to control the growth of T-BFO
structure. It should be ascribed to the fact that a Bi-rich phase
interlayer (∼5 nm) could be formed on ITO, which acted as a
crystal seed layer and thus induced the growth of (001)-textured T-BFO
structure. The observed weak room temperature ferromagnetism should
be attributed to Fe valence change. Open circuit potential measurements
under 360 μW/cm<sup>2</sup> full spectra irradiation show that
the open circuit potential and the lifetime of photo-induced carriers
increased under applied magnetic field, which reveals that the applied
magnetic field can manipulate the photo electrochemical behaviors
of BFO film. Our findings offer a simple way to fabricate highly (001)-textured
T-BFO film, which make it desirable to obtain extensive applications
for these oriented BFO films
Ratio of experiment data to the calculation results of burst strength.
<p>Ratio of experiment data to the calculation results of burst strength.</p
Relationship between the ratio of test data to calculations and the radius-thickness ratio (D/t).
<p>Relationship between the ratio of test data to calculations and the radius-thickness ratio (D/t).</p
Comparison of burst strength calculation results with test data.
<p>Comparison of burst strength calculation results with test data.</p
Tuning Phase Composition of Polymer Nanocomposites toward High Energy Density and High Discharge Efficiency by Nonequilibrium Processing
Polymer nanocomposite dielectrics with high energy density and
low loss are major enablers for a number of applications in modern
electronic and electrical industry. Conventional fabrication of nanocomposites
by solution routes involves equilibrium process, which is slow and
results in structural imperfections, hence high leakage current and
compromised reliability of the nanocomposites. We propose and demonstrate
that a nonequilibrium process, which synergistically integrates electrospinning,
hot-pressing and thermal quenching, is capable of yielding nanocomposites
of very high quality. In the nonequilibrium nanocomposites of polyÂ(vinylidene
fluoride-<i>co</i>-hexafluoropropylene) (PÂ(VDF-HFP)) and
BaTiO<sub>3</sub> nanoparticles (BTO_nps), an ultrahigh Weibull modulus
β of ∼30 is achieved, which is comparable to the quality
of the bench-mark biaxially oriented polypropylene (BOPP) fabricated
with melt-extrusion process by much more sophisticated and expensive
industrial apparatus. Favorable phase composition and small crystalline
size are also induced by the nonequilibrium process, which leads to
concomitant enhancement of electric displacement and breakdown strength
of the nanocomposite hence a high energy density of ∼21 J/cm<sup>3</sup>. Study on the polarization behavior and phase transformation
at high electric field indicates that BTO_nps could facilitate the
phase transformation from α- to β-polymorph at low electric
field
Self-Reconstructed Formation of a One-Dimensional Hierarchical Porous Nanostructure Assembled by Ultrathin TiO<sub>2</sub> Nanobelts for Fast and Stable Lithium Storage
Owing
to their unique structural advantages, TiO<sub>2</sub> hierarchical
nanostructures assembled by low-dimensional (LD) building blocks have
been extensively used in the energy-storage/-conversion field. However,
it is still a big challenge to produce such advanced structures by
current synthetic techniques because of the harsh conditions needed
to generate primary LD subunits. Herein, a novel one-dimensional (1D)
TiO<sub>2</sub> hierarchical porous fibrous nanostructure constructed
by TiO<sub>2</sub> nanobelts is synthesized by combining a room-temperature
aqueous solution growth mechanism with the electrospinning technology.
The nanobelt-constructed 1D hierarchical nanoarchitecture is evolves
directly from the amorphous TiO<sub>2</sub>/SiO<sub>2</sub> composite
fibers in alkaline solutions at ambient conditions without any catalyst
and other reactant. Benefiting from the unique structural features
such as 1D nanoscale building blocks, large surface area, and numerous
interconnected pores, as well as mixed phase anatase-TiO<sub>2</sub>(B), the optimum 1D TiO<sub>2</sub> hierarchical porous nanostructure
shows a remarkable high-rate performance when tested as an anode material
for lithium-ion batteries (107 mA h g<sup>–1</sup> at ∼10
A g<sup>–1</sup>) and can be used in a hybrid lithium-ion supercapacitor
with very stable lithium-storage performance (a capacity retention
of ∼80% after 3000 cycles at 2 A g<sup>–1</sup>). The
current work presents a scalable and cost-effective method for the
synthesis of advanced TiO<sub>2</sub> hierarchical materials for high-power
and stable energy-storage/-conversion devices