Materials Literature
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Here we present a simple platform for probing plasmon enhanced photoluminescence (PL) of quantum dots by confocal microscopy. In this study, self-assembled monolayers of silane-derivative molecules were patterned onto the oxidized GaAs surfaces to direct the attachment of Au or Ag nanoparticles onto the surface. Follo…
A new family of cyano-bridged coordination polymers Ln(H(2)O)(5)[M(CN)(8)] (Ln = Eu, Tb, Sm, Gd; M = Mo, W) were obtained and characterized by X-ray diffraction, photoluminescence spectroscopy, and magnetic analyses. These compounds are isomorphous and crystallize in the tetragonal system P4/nmm, forming two-dimension…
Optical properties of lead borate glasses containing Dy(3+) ions were examined using absorption and luminescence measurements and theoretical calculations based on the Judd-Ofelt framework and the Inokuti-Hirayama model. The luminescence spectra show two characteristic bands at 480 and 573 nm, which are due to (4)F(9/…
A graphene nanoribbon with zigzag edges has a gapped magnetic ground state with an antiferromagnetic interedge superexchange interaction. We present a theory based on asymptotic properties of the Dirac-model ribbon wave function which predicts W-2 and W-1 ribbon-width dependencies for the superexchange interaction str…
Abstract By changing the surfactant/water ratio , nanoparticles of the iron(II) spin crossover material, [Fe(NH 2 ‐trz) 3 ]Br 2 ⋅ 3 H 2 O (with NH 2 ‐trz=4‐amino‐1,2,4‐triazole), have been synthesised from 1 μm down to 30 nm (see figure). Magnetic and reflectivity experiments indicate that the critical size for observ…
We report robust vortex matching effects in antidot arrays fabricated on thin films of NbN. The near absence of hysteresis between field sweep directions indicates a negligible residual pinning in the host thin film. Owing to the very small coherence length of NbN thin films ($ξ< 5 nm$), the observations suggests the…
We have performed first-order reversal-curve measurements of the temperature-driven metal-insulator transition in ${\text{VO}}_{2}$ thin films, which enable quantitative analysis of the hysteresis behavior. An unexpected tail-like feature in the contour plot of the reversal-curve distribution indicates the existence o…
In this paper, heat flux in graphene nano ribbons has been studied by using molecular dynamics simulations. It is found that the heat flux runs preferentially along the direction of decreasing width, which demonstrates significant thermal rectification effect in the asymmetric graphene ribbons. The dependence of recti…
The current controversies about the existence of an intermediate 'beta' phase of BiFeO_3 and the high temperature paraelectric 'gamma' phase are resolved by studying the sequence of ferroic transitions in 0.8BiFeO_3-0.2Pb(Fe_1/2Nb_1/2)O_3 (BF-0.2PFN) with lowered transition temperature. It is shown that the room tempe…
Liquid marbles are liquid drops made completely nonwetting by encapsulating the drop with a hydrophobic powder. The absence of contact with the substrate avoids contamination problems and produces high marble displacement velocities. Liquid marbles behave as microreservoirs of liquids able to move without any leakage…
The transport of a Newtonian liquid through a smooth pipe or tube is dominated by the frictional drag on the liquid against the walls. The resistance to flow against a solid can, however, be reduced by introducing a layer of gas at or near the boundary between the solid and liquid. This can occur by the vaporization o…
Hydrogels can be prepared using the commercially available Fmoc-phenylalanine or Fmoc-tyrosine as the gelator. Gelation is triggered by careful adjustment of the pH of the solution using glucono-delta-lactone (GdL). Model dyes have been entrapped in the hydrogels, and the release of the dyes from the hydrogels has bee…
We report a simple and effective way of fabricating high-quality carbon nanoscrolls (CNSs), using isopropyl alcohol solution to roll up monolayer graphene predefined on SiO(2)/Si substrates. Transmission electron microscopy studies reveal that the CNS has a tube-like structure with a hollow core surrounded by graphene…
We have used molecular dynamics to calculate the thermal conductivity of symmetric and asymmetric graphene nanoribbons (GNRs) of several nanometers in size (up to approximately 4 nm wide and approximately 10 nm long). For symmetric nanoribbons, the calculated thermal conductivity (e.g., approximately 2000 W/m-K at 400…
In the present paper, we have used a new semi-empirical method to characterise the oxidation by OH of a benzene molecule adsorbed on a soot surface modelled by a graphene-like cluster. This method is based on an electrostatic and induction contribution calculated at the self-consistent field AM1 level associated with…
We present a molecular dynamics study in the isothermal–isobaric ensemble of a flexible model of linear n-alkanes for close to the glass transition. Our model is a modification of a realistic force field in which we have turned off the bond bending and the torsional intramolecular potentials to get the chain flexible.…
In condensed polymeric liquids confined in slit channels, the movement of chains is constrained by two factors: entanglement among the chains and the excluded volume between the chains and the wall. In this study, we propose a wall boundary (WB) model for the primitive chain network (PCN) model, which describes the dy…
The role of urea as an additive on the physico-mechanical properties of radiation vulcanised natural rubber latex (RVNRL) films was investigated. RVNRL films were prepared by the addition of urea with the concentration range 0–1.0 phr (parts per hundred rubber) and irradiated with various radiation doses (0–20 kGy). T…
A new MoSi 2 –Si–B ceramic coating was prepared on the surface of SiC coated carbon/carbon (C/C) composites by a simple and low-cost slurry method. The microstructures of the double-layer coatings were characterised by X-ray diffraction, scanning electron microscopy and energy dispersive spectroscopy analyses. It coul…
Trisilanol polyhedral oligomeric silsesquioxane (POSS) derivatives have recently been reported as a new class of amphiphilic molecules that form stable Langmuir monolayers at the air/water interface and exhibit interesting phase transitions and aggregation behavior. In this letter, surface light scattering (SLS) has b…