25 research outputs found

    Solution−Chemical Synthesis of Carbon Nanotube/ZnS Nanoparticle Core/Shell Heterostructures

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    A facile solution−chemical method has been developed to be capable of encapsulating a multiwalled carbon nanotube (MWCNT) with ZnS nanocrystals without using any bridging species. The thickness of the ZnS shell can be tuned easily by controlling the experimental conditions. The optical properties of the MWCNT/ZnS heterostructures were investigated using UV−vis absorption and photoluminescence spectroscopy. The optical absorption spectrum indicates that the band gap of ZnS nanocrystallites is 4.2 eV. On the basis of the photoluminescence spectrum, charge transfer is thought to proceed from ZnS nanocrystals to the nanotube in the ZnS−carbon nanotube system. These special heterostructures are very easily encapsulated within a uniform silica layer by a modified-Stöber process and still show better stability even after heat treatment at 400 °C, which makes them appealing for practical applications in biochemistry and biodiagnostics

    Synthesis of Mesoporous Eu<sub>2</sub>O<sub>3</sub> Microspindles

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    Mesoporous Eu2O3 microspindles have been prepared by a facile solution process followed by subsequent heat treatment. By adding urea stepwise and varying the reaction time, the dimension of the Eu2O3 microspindles can be easily tuned from 250 × 100 nm to 900 × 400 nm. The products were characterized by X-ray diffraction, small-angle X-ray scattering, (high-resolution) transmission electron microscopy, scanning electron microscopy, N2 adsorption, and photoluminescence spectroscopy. The Eu2O3 samples exhibit a relatively broad pore-size distribution, and the wall of the pore is constructed by well-crystalline Eu2O3 nanocrystals with diameters of about 15 nm. A possible formation mechanism of the mesoporous microspindles was also discussed

    Controlled Synthesis of High-Quality PbS Star-Shaped Dendrites, Multipods, Truncated Nanocubes, and Nanocubes and Their Shape Evolution Process

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    Well-defined single-crystalline PbS nano- and microstructures including dendrites, multipods, truncated nanocubes, and nanocubes were synthesized in high yield by a simple solution route. Novel star-shaped PbS dendrites with six symmetric arms along the 〈100〉 direction, each of which shows one trunk (long axis) and four branches (short axes), have been achieved using Pb(AC)2 and thioacetamide (TAA) as precursors, under the molar ratio Pb(AC)2/TAA = 2/1, at initial reaction temperature 80 °C, refluxing for 30 min at 100 °C, in the presence of cetyltrimethylammonium bromine (CTAB). The “nanorods” in each branch are parallel to each other in the same plane and are perpendicular to the trunk. The truncated nanocubes mainly bounded by the {100} plane were prepared under a different Pb(AC)2/TAA molar ratio, at initial reaction temperature 40 °C, refluxing for 12 h at 100 °C. Based on the systematic studies on their shape evolution, a possible growth mechanism of these PbS nano- and microstructures was proposed. The shapes of PbS nanocrystals with face-centered cubic (fcc) structure are mainly determined by the ratio (R) between the growth rates along the 〈100〉 and 〈111〉 directions. The Pb(AC)2/TAA molar ratio and the initial reaction temperature influence the growth ratio R in the formation of PbS nuclei at an early stage, which results in the final morphology of PbS nanocrystals. Under the current experimental conditions, we can control the PbS shape evolution by simply tuning the molar ratio, the initial reaction temperature, and the period of reaction. Based on the systematic studies on the shape evolution, this approach is expected to be employed for the control-shaped synthesis of other fcc structural semiconductor nanomaterials. The photoluminescence properties were investigated and the prepared nano- and microstructures displayed a very strong luminescence around 600−650 nm at room temperature

    Additional file 1 of FOXD3 confers chemo-sensitivity in ovarian cancer through a miR-335/DAAM1/myosin II axis-dependent mechanism

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    Additional file 1: Supplementary Fig. 1. KM survival curves based on 19 candidate genes in OC. Red indicates patients with high gene expression and blue indicates those with low gene expression

    Vapor–Liquid Equilibrium of α‑Pinene, Longifolene, and Abietic Acid of Pine Oleoresin: HS-GC Measurements and Model Correlation

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    Investigating phase equilibrium on the terpenoid of the pine oleoresin system is of great importance for the usage relevant to the oleoresin. Herein, the binary and ternary isothermal vapor–liquid equilibrium (VLE) of α-pinene, longifolene, and abietic acid (three main components of oleoresin) at 313.15, 323.15, and 333.15 K were measured by headspace gas chromatography (HS-GC). There was no azeotropic behavior observed of α-pinene and longifolene. Abietic acid’s influence on separating α-pinene and longifolene was discussed. The relative volatilities of α-pinene and longifolene decrease in the presence of abietic acid, indicating a negative impact of abietic acid on their separation. The experimental data were correlated well with the nonrandom two-liquid, universal quasichemical, and Wilson models. The binary interaction parameters for each equation were also obtained, and the largest mean relative deviation of vapor-phase mole fraction and the largest absolute average deviation of pressure are 0.1975% and 0.0856 kPa, respectively

    Vapor–Liquid Equilibrium of Monoterpene-Sesquiterpene System Containing Resin Acid

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    The phase equilibrium relationships of resin systems are indispensable for resin tapping, distillation, and investigating the release of terpenes in biogenic volatile organic compounds (BVOCs). Herein, we obtained the vapor–liquid equilibrium (VLE) data of monoterpene-sesquiterpene systems that contain resin acid by a headspace gas chromatography (HS-GC). There is no azeotropic behavior between terpenes, and abietic acid was found to inhibit the volatilization and separation of terpenes. Furthermore, the saturated vapor pressure of the systems almost triples when the experimental temperature increases from 313.15 to 333.15 K, which may exacerbate terpene emissions in ecosystems. Additionally, the thermodynamic consistency of the VLE values was confirmed by van Ness test, and the experimental data were correlated using NRTL, UNIQUAC, and Wilson activity coefficient models, while the Conductor-like Screening Model for Real Solvents (COSMO-RS) model was utilized for predictions. All of the data satisfy thermodynamic consistency, and the correlation results and prediction results demonstrate good adherence of the activity coefficient models to experimental values and the positive capacity of COSMO-RS in predicting the VLE relationship for the pine resin systems, respectively

    Microscale Curling and Alignment of Ti<sub>3</sub>C<sub>2</sub>T<i><sub>x</sub></i> MXene by Confining Aerosol Droplets for Planar Micro-Supercapacitors

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    Additive manufacturing techniques have revolutionized the field of fabricating micro-supercapacitors (MSCs) with a high degree of pattern and geometry flexibility. However, traditional additive manufacturing processes are based on the functionality of microstructural modulation, which is essential for device performance. Herein, Ti3C2Tx MXene was chosen to report a convenient aerosol jet printing (AJP) process for the in situ curling and alignment of MXene nanosheets. The aerosol droplet provides a microscale regime for curling MXene monolayers while their alignment is performed by the as-generated directional stress derived from the quasi-conical fiber array (CFA)-guided parallel droplet flow. Interdigital microelectrodes were further developed with the curled MXene and a satisfying areal capacitance performance has been demonstrated. Importantly, the AJP technique holds promise for revolutionizing additive manufacturing techniques for fabricating future smart microelectronics and devices not only in the microscale but also in the nanoscale

    MOESM4 of Comprehensive bioinformatics analysis of acquired progesterone resistance in endometrial cancer cell line

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    Additional file 4: Table S4. Microarray analysis result of genes related to lipid metabolic and biosynthetic process in IshikawaPR and Ishikawa cell
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