Synthesis and characterisation of reduced graphene oxide-boron nitride nanotubes hybrid

No description supplied</p

Synthesis and characterisation of reduced graphene oxide-boron nitride nanotubes hybrid

No description supplied</p

Coulomb Explosion in Nanosecond Laser Fields

We report experimental observations of Coulomb explosion using a nanosecond laser at 532 nm with intensities less than 1012 W/cm2. We observe multiply charged atomic ions Arn+ (1 ≤ n ≤ 7) and Cn+ (1 ≤ n ≤ 4) from argon clusters doped with molecules containing aromatic chromophores. The yield of Arn+ depends on the size of the cluster, the number density, and the photostability of the dopant. We propose that resonant absorption of ArN+ achieves a high degree of ionization, and the highly positively charged cluster has the capability to strip electrons from the evaporating Ar+ on the surface of the cluster prior to Coulomb explosion, forming Arn+

Development of Wood Polymer Composites from Recycled Wood and Plastic Waste: Thermal and Mechanical Properties

The depletion of natural resources due to the aggressive industrialization in the last decades has brought considerable attention to research aimed at developing green and sustainable products using eco-friendly materials. The purpose of the current study was to develop wood polymer composites (WPCs) using recycled plastic waste (RPW) generated from university laboratories and recycled wood waste (RWW) from construction and demolition (C&D) activities by melt-blending technique. The WPCs were characterised for their mechanical and thermal properties, as well as water uptake and morphology. The SEM micrograph indicated good interaction between RWW and RPW matrix. The mechanical strength of the WPCs was found to increase from 26.59 to 34.30 MPa, with an increase of the RWW content in the matrix. The thermal stability was higher in the composite with a higher percentage of RWW in the matrix. The wettability results indicated that the composite with a higher RWW (20%) had a higher water uptake. These results suggest that the produced WPCs can be a promising environmental-friendly material, while maintaining good mechanical, thermal, and wettability properties

Visualization 1: Burst-mode-operated, sub-nanosecond fiber MOPA system incorporating direct seed-packet shaping

The calculation process to get the required pre-shape of the seed to form square shaped pulse burst after amplification Originally published in Optics Express on 05 September 2016 (oe-24-18-20963

In Vivo Toxicity Assessment of Nickel Zinc Carbon Nanotubes in a Living Host Model

No description supplie

Synthesis of (<i>Z</i>)‑1-Thio- and (<i>Z</i>)‑2-Thio-1-alkenyl Boronates via Copper-Catalyzed Regiodivergent Hydroboration of Thioacetylenes: An Experimental and Theoretical Study

A Cu-catalyzed divergent hydroboration of thioacetylenes has been achieved, providing (<i>Z</i>)-1-thio- or (<i>Z</i>)-2-thio-1-alkenyl boronates in moderate to high yields with excellent regio- and stereoselectivity, by using pinacolborane or bis­(pinacolato)­diboron as the hydroborating reagents, respectively. DFT calculations indicate that the sulfur atom plays a key role in determining the regioselectivity through polarizing the C–C triple bonds and participating in the HOMO orbitals. Moreover, the SR group can serve as a good leaving group, resulting in the concise synthesis of six regio- and stereoisomers of trisubstituted alkenes <b>5</b> via the iterative cross-coupling of C–B and C–S bonds. Clearly, it will be valuable for assembling stereochemically diverse trisubstituted olefins in organic synthesis

Electron Diffraction of Superfluid Helium Droplets

We present experimental results of electron diffraction of superfluid helium droplets and droplets doped with phthalocyanine gallium chloride and discuss the possibility of performing the same experiment with a laser aligned sample. The diffraction profile of pure droplets demonstrates dependence on the nozzle temperature, that is, on the average size of the droplets. Larger clusters demonstrate faster decay with increasing momentum transfer, whereas smaller clusters converge to isolated gas phase molecules at source temperatures of 18 K and higher. Electron diffraction of doped droplets shows similar modified molecular scattering intensity as that of the corresponding gas phase molecules. On the basis of fittings of the scattering profile, the number of remaining helium atoms of the doped droplets is estimated to be on the order of hundreds. This result offers guidance in assessing the possibility of electron diffraction from laser aligned molecules doped in superfluid helium droplets

Visualization 2: Burst-mode-operated, sub-nanosecond fiber MOPA system incorporating direct seed-packet shaping

The calculation process to get the required pre-shape of the seed to form double rectangle pulse burst after amplification Originally published in Optics Express on 05 September 2016 (oe-24-18-20963

Oleylamine-Mediated Synthesis of Small NaYbF₄ Nanoparticles with Tunable Size

Hexagonal phase NaYbF4 has recently been reorganized as a more efficient host material than NaYF4 for constructing multiphoton upconversion nanoparticles. However, the synthesis and size control of NaYbF4 nanoparticles have not been completely fulfilled. This study presents a controlled synthesis of small NaYbF4 nanoparticles as well as a mechanistic investigation of the nanocrystal growth process. The NaYbF4 nanoparticles were synthesized in a ternary solvent mixture composed of oleylamine, oleic acid, and 1-octadecene by an injection technique. The oleylamine molecule as a surface capping ligand is found to play critical roles in controlling the growth of NaYbF4 nanoparticles by promoting conversion of the cubic phase intermediates into the hexagonal phase products. Uniform NaYbF4 nanoparticles with tunable size (from 7 to 70 nm) were readily prepared by controlling a single variable of solvent composition. After coating with NaLuF4 shells of 10 nm in thickness, the small NaYbF4:Er (2%) nanoparticles exhibited an over 700-fold enhancement in red upconversion emission. By introducing Yb3+ ions into the shells, the oleate-capped NaYbF4:Er (2%)@NaLuF4:Yb (25%) upconversion nanoparticles showed an inverse thermal quenching above room temperature. The findings described here are expected to provide a general strategy for facile control of particle size and optical property in other nanomaterials systems