18 research outputs found
Liquid–Solid Process for Growing Gold Nanowires on an Indium Tin Oxide Substrate as Excellent Field Emitters
Gold nanowires are successfully grown on an ITO substrate
by a
liquid–solid process. An excellent field emission behavior
of the nanowires, as indicated by the field enhancement factor (β)
of up to 7585, indicates a significant decrease in energy barrier
between the nanowires and the ITO substrate. A single Au nanowire
demonstrates a strong emission current up to 800 nA at an applied
voltage of 200 V. The outstanding reliability of the nanowires warrants
their potential applications as effective electron field emitters
and chemical and/or biological sensors in future microelectronics
Triboelectric-Generator-Driven Pulse Electrodeposition for Micropatterning
By converting ambient energy into electricity, energy
harvesting
is capable of at least offsetting, or even replacing, the reliance
of small portable electronics on traditional power supplies, such
as batteries. Here we demonstrate a novel and simple generator with
extremely low cost for efficiently harvesting mechanical energy that
is typically present in the form of vibrations and random displacements/deformation.
Owing to the coupling of contact charging and electrostatic induction,
electric generation was achieved with a cycled process of contact
and separation between two polymer films. A detailed theory is developed
for understanding the proposed mechanism. The instantaneous electric
power density reached as high as 31.2 mW/cm<sup>3</sup> at a maximum
open circuit voltage of 110 V. Furthermore, the generator was successfully
used without electric storage as a direct power source for pulse electrodeposition
(PED) of micro/nanocrystalline silver structure. The cathodic current
efficiency reached up to 86.6%. Not only does this work present a
new type of generator that is featured by simple fabrication, large
electric output, excellent robustness, and extremely low cost, but
also extends the application of energy-harvesting technology to the
field of electrochemistry with further utilizations including, but
not limited to, pollutant degradation, corrosion protection, and water
splitting
Coaxial Metal-Silicide Ni<sub>2</sub>Si/C54-TiSi<sub>2</sub> Nanowires
One-dimensional metal silicide nanowires are excellent
candidates
for interconnect and contact materials in future integrated circuits
devices. Novel core–shell Ni<sub>2</sub>Si/C54-TiSi<sub>2</sub> nanowires, 2 μm in length, were grown controllably via a solid–liquid–solid
growth mechanism. Their interesting ferromagnetic behaviors and excellent
electrical properties have been studied in detail. The coercivities
(Hcs) of the core–shell Ni<sub>2</sub>Si/C54-TiSi<sub>2</sub> nanowires was determined to be 200 and 50 Oe at 4 and 300 K, respectively,
and the resistivity was measured to be as low as 31 μΩ-cm.
The shift of the hysteresis loop with the temperature in zero field
cooled (ZFC) and field cooled (FC) studies was found. ZFC and FC curves
converge near room temperature at 314 K. The favorable ferromagnetic
and electrical properties indicate that the unique core–shell
nanowires can be used in penetrative ferromagnetic devices at room
temperature simultaneously as a future interconnection in integrated
circuits
Lead-Free NaNbO<sub>3</sub> Nanowires for a High Output Piezoelectric Nanogenerator
Perovskite ferroelectric nanowires have rarely been used for the conversion of tiny mechanical vibrations into electricity, in spite of their large piezoelectricity. Here we present a lead-free NaNbO<sub>3</sub> nanowire-based piezoelectric device as a high output and cost-effective flexible nanogenerator. The device consists of a NaNbO<sub>3</sub> nanowire–poly(dimethylsiloxane) (PDMS) polymer composite and Au/Cr-coated polymer films. High-quality NaNbO<sub>3</sub> nanowires can be grown by hydrothermal method at low temperature and can be poled by an electric field at room temperature. The NaNbO<sub>3</sub> nanowire–PDMS polymer composite device shows an output voltage of 3.2 V and output current of 72 nA (current density of 16 nA/cm<sup>2</sup>) under a compressive strain of 0.23%. These results imply that NaNbO<sub>3</sub> nanowires should be quite useful for large-scale lead-free piezoelectric nanogenerator applications
Graphene Oxide Templated Growth and Superior Lithium Storage Performance of Novel Hierarchical Co<sub>2</sub>V<sub>2</sub>O<sub>7</sub> Nanosheets
Hierarchical Co<sub>2</sub>V<sub>2</sub>O<sub>7</sub> nanosheets consisted of interconnected nanoparticles
are synthesized by a facile method using graphene oxide as the template.
The electrochemical reaction mechanism of the Co<sub>2</sub>V<sub>2</sub>O<sub>7</sub> nanosheets is thoroughly investigated by in
situ XRD and ex situ TEM. The initial Co<sub>2</sub>V<sub>2</sub>O<sub>7</sub> transforms into CoO nanoparticles and vanadium oxides in
the first cycle, and the following reversible conversion reaction
mainly occurs between CoO and Co and lithiation/delithiation of the
vanadium oxides. The Co<sub>2</sub>V<sub>2</sub>O<sub>7</sub> nanosheet
displays a high reversible capacity (962 mAh/g at 0.5 A/g) and remarkable
high rate capability. When cycled at 5.0 A/g, a reversible capacity
of 441 mAh/g can be retained after 900 cycles. The stable high capacity
and excellent rate capability make the hierarchical Co<sub>2</sub>V<sub>2</sub>O<sub>7</sub> nanosheets a promising anode material
for lithium-ion batteries
Solution Processable Holey Graphene Oxide and Its Derived Macrostructures for High-Performance Supercapacitors
Scalable preparation of solution
processable graphene and its bulk materials with high specific surface
areas and designed porosities is essential for many practical applications.
Herein, we report a scalable approach to produce aqueous dispersions
of holey graphene oxide with abundant in-plane nanopores via a convenient
mild defect-etching reaction and demonstrate that the holey graphene
oxide can function as a versatile building block for the assembly
of macrostructures including holey graphene hydrogels with a three-dimensional
hierarchical porosity and holey graphene papers with a compact but
porous layered structure. These holey graphene macrostructures exhibit
significantly improved specific surface area and ion diffusion rate
compared to the nonholey counterparts and can be directly used as
binder-free supercapacitor electrodes with ultrahigh specific capacitances
of 283 F/g and 234 F/cm<sup>3</sup>, excellent rate capabilities,
and superior cycling stabilities. Our study defines a scalable pathway
to solution processable holey graphene materials and will greatly
impact the applications of graphene in diverse technological areas
Image_3_Reduced mitochondrial DNA content correlate with poor clinical outcomes in cryotransfers with day 6 single euploid embryos.pdf
ObjectiveTo investigate whether the mitochondrial DNA (mtDNA) content of a single biopsy at trophoblast correlates with the developmental potential and reproductive outcomes of blastocyst.MethodsA retrospective analysis applied the dataset of 1,675 embryos with preimplantation genetic testing for aneuploidy (PGT-A) from 1,305 individuals, and 1,383 embryos involved cryotransfers of single euploid embryo between January 2015 and December 2019. The studied cohort was divided for algorithm establishment on the NGS platform (n=40), correlation of biological features (n=1,635), and correlation of reproductive outcomes (n=1,340). Of the algorithm derived from the NGS platform, the reliability and repeatability were validated via qPCR assay and inter-run controls, respectively. Of the correlation across biological features, stratification analyses were applied to evaluate the effect from a single contributor. Eventually, the correlation between the mtDNA ratios and reproductive outcomes was adjusted according to the significant effector(s).ResultsThe mtDNA ratios showed statistically different between embryos with different days of blastocyst formation ([Day 5]: 1.06 vs. [Day 6]: 0.66, p=0.021), and between embryos with different expansion stages ([Expansion 5]: 1.05 vs. [Expansion 6]: 0.49, p=0.012). None or weakly correlated with the maternal age, morphology, ploidy, and gender. Analyzed by the different days of blastocyst formation with fixed expansion score as 5 in the euploid single embryo transfers (eSET), the day 6 eSET showed significantly lower reduced mtDNA ratio (n=139) in failure groups of fetal heartbeat (p=0.004), ongoing pregnancy (p=0.007), and live birth (p=0.01); however, no correlation between mtDNA ratios and pregnancy outcomes was observed in the day 5 eSET (n=1,201).ConclusionsThe study first demonstrated that mtDNA ratio was dependent on the days of blastocyst formation while expansion stage was fixed. Lower mtDNA ratios were observed in the day 6 eSET with adverse outcomes. The present stratification analyses reveal that the timeline of embryo is an important covariate to the mtDNA content.</p
Table_5_Reduced mitochondrial DNA content correlate with poor clinical outcomes in cryotransfers with day 6 single euploid embryos.pdf
ObjectiveTo investigate whether the mitochondrial DNA (mtDNA) content of a single biopsy at trophoblast correlates with the developmental potential and reproductive outcomes of blastocyst.MethodsA retrospective analysis applied the dataset of 1,675 embryos with preimplantation genetic testing for aneuploidy (PGT-A) from 1,305 individuals, and 1,383 embryos involved cryotransfers of single euploid embryo between January 2015 and December 2019. The studied cohort was divided for algorithm establishment on the NGS platform (n=40), correlation of biological features (n=1,635), and correlation of reproductive outcomes (n=1,340). Of the algorithm derived from the NGS platform, the reliability and repeatability were validated via qPCR assay and inter-run controls, respectively. Of the correlation across biological features, stratification analyses were applied to evaluate the effect from a single contributor. Eventually, the correlation between the mtDNA ratios and reproductive outcomes was adjusted according to the significant effector(s).ResultsThe mtDNA ratios showed statistically different between embryos with different days of blastocyst formation ([Day 5]: 1.06 vs. [Day 6]: 0.66, p=0.021), and between embryos with different expansion stages ([Expansion 5]: 1.05 vs. [Expansion 6]: 0.49, p=0.012). None or weakly correlated with the maternal age, morphology, ploidy, and gender. Analyzed by the different days of blastocyst formation with fixed expansion score as 5 in the euploid single embryo transfers (eSET), the day 6 eSET showed significantly lower reduced mtDNA ratio (n=139) in failure groups of fetal heartbeat (p=0.004), ongoing pregnancy (p=0.007), and live birth (p=0.01); however, no correlation between mtDNA ratios and pregnancy outcomes was observed in the day 5 eSET (n=1,201).ConclusionsThe study first demonstrated that mtDNA ratio was dependent on the days of blastocyst formation while expansion stage was fixed. Lower mtDNA ratios were observed in the day 6 eSET with adverse outcomes. The present stratification analyses reveal that the timeline of embryo is an important covariate to the mtDNA content.</p
Table_1_Reduced mitochondrial DNA content correlate with poor clinical outcomes in cryotransfers with day 6 single euploid embryos.pdf
ObjectiveTo investigate whether the mitochondrial DNA (mtDNA) content of a single biopsy at trophoblast correlates with the developmental potential and reproductive outcomes of blastocyst.MethodsA retrospective analysis applied the dataset of 1,675 embryos with preimplantation genetic testing for aneuploidy (PGT-A) from 1,305 individuals, and 1,383 embryos involved cryotransfers of single euploid embryo between January 2015 and December 2019. The studied cohort was divided for algorithm establishment on the NGS platform (n=40), correlation of biological features (n=1,635), and correlation of reproductive outcomes (n=1,340). Of the algorithm derived from the NGS platform, the reliability and repeatability were validated via qPCR assay and inter-run controls, respectively. Of the correlation across biological features, stratification analyses were applied to evaluate the effect from a single contributor. Eventually, the correlation between the mtDNA ratios and reproductive outcomes was adjusted according to the significant effector(s).ResultsThe mtDNA ratios showed statistically different between embryos with different days of blastocyst formation ([Day 5]: 1.06 vs. [Day 6]: 0.66, p=0.021), and between embryos with different expansion stages ([Expansion 5]: 1.05 vs. [Expansion 6]: 0.49, p=0.012). None or weakly correlated with the maternal age, morphology, ploidy, and gender. Analyzed by the different days of blastocyst formation with fixed expansion score as 5 in the euploid single embryo transfers (eSET), the day 6 eSET showed significantly lower reduced mtDNA ratio (n=139) in failure groups of fetal heartbeat (p=0.004), ongoing pregnancy (p=0.007), and live birth (p=0.01); however, no correlation between mtDNA ratios and pregnancy outcomes was observed in the day 5 eSET (n=1,201).ConclusionsThe study first demonstrated that mtDNA ratio was dependent on the days of blastocyst formation while expansion stage was fixed. Lower mtDNA ratios were observed in the day 6 eSET with adverse outcomes. The present stratification analyses reveal that the timeline of embryo is an important covariate to the mtDNA content.</p
Table_2_Reduced mitochondrial DNA content correlate with poor clinical outcomes in cryotransfers with day 6 single euploid embryos.pdf
ObjectiveTo investigate whether the mitochondrial DNA (mtDNA) content of a single biopsy at trophoblast correlates with the developmental potential and reproductive outcomes of blastocyst.MethodsA retrospective analysis applied the dataset of 1,675 embryos with preimplantation genetic testing for aneuploidy (PGT-A) from 1,305 individuals, and 1,383 embryos involved cryotransfers of single euploid embryo between January 2015 and December 2019. The studied cohort was divided for algorithm establishment on the NGS platform (n=40), correlation of biological features (n=1,635), and correlation of reproductive outcomes (n=1,340). Of the algorithm derived from the NGS platform, the reliability and repeatability were validated via qPCR assay and inter-run controls, respectively. Of the correlation across biological features, stratification analyses were applied to evaluate the effect from a single contributor. Eventually, the correlation between the mtDNA ratios and reproductive outcomes was adjusted according to the significant effector(s).ResultsThe mtDNA ratios showed statistically different between embryos with different days of blastocyst formation ([Day 5]: 1.06 vs. [Day 6]: 0.66, p=0.021), and between embryos with different expansion stages ([Expansion 5]: 1.05 vs. [Expansion 6]: 0.49, p=0.012). None or weakly correlated with the maternal age, morphology, ploidy, and gender. Analyzed by the different days of blastocyst formation with fixed expansion score as 5 in the euploid single embryo transfers (eSET), the day 6 eSET showed significantly lower reduced mtDNA ratio (n=139) in failure groups of fetal heartbeat (p=0.004), ongoing pregnancy (p=0.007), and live birth (p=0.01); however, no correlation between mtDNA ratios and pregnancy outcomes was observed in the day 5 eSET (n=1,201).ConclusionsThe study first demonstrated that mtDNA ratio was dependent on the days of blastocyst formation while expansion stage was fixed. Lower mtDNA ratios were observed in the day 6 eSET with adverse outcomes. The present stratification analyses reveal that the timeline of embryo is an important covariate to the mtDNA content.</p