Materials Literature
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FT-Raman and FT-IR spectra of the 7-aminoflavone have been recorded and analysed. The detailed interpretation of the vibrational spectra has been carried out with the aid of normal coordinate analysis following the scaled quantum mechanical force field methodology. The various intramolecular interactions that are resp…
We characterize multilayer graphene grown on C-face SiC before and after exposure to a total ionizing dose of 12 Mrad(SiO2) using a 10 keV x-ray source. While we observe the partial peeling of the top graphene layers and the appearance of a modest Raman D-peak, we find that the electrical characteristics (mobility, sh…
Computational techniques are widely used to explore the structure and properties of nanomaterials. This review surveys the application of both quantum mechanical and force field based atomistic simulation methods to nanoparticles, with a particular focus on the methodologies available and the ways in which they can be…
Electric field controlled rotation of the magnetization direction of a ferromagnet is investigated in the composite of antiferromagnetic (AF)/ferromagnetic (F)/piezoelectric (PE) layers. Usually, simple 90° magnetization switching is reported with uniaxial F/PE composites. In contrast, when considering unidirectional…
We used scanning tunnelling microscopy to study the morphology of superconducting FeSe 0.5 Te 0.5 thin films epitaxially grown by pulsed laser deposition. Samples with critical temperature T c above the bulk value (>16 K) show large atomic terraces, and a square lattice of periodicity 3.8 Å associated with the Se/Te s…
This case-study outlines the development and scale-up of a novel solvent-mediated process for producing small crystals. The process combines polymorph transformation with high shear to produce API with a desirable crystal phase and morphology that meets the particle size acceptance criteria ( d 90 < 75 μm). The impact…
Phase-shifting interferometric imaging is shown to be a powerful analytical tool for studying graphene films, providing quantitative analysis of large area samples with an optical thickness resolution of ≤0.05 nm. The technique is readily able to identify single sheets of graphene and to quantitatively distinguish bet…
In this paper, we report a simple method to recover the surface enhanced Raman scattering activity of aged graphene. The Raman signals of Rhodamine molecules absorbed on aged graphene are dramatically increased after vacuum annealing and comparable to those on fresh graphene. Atomic force microscopy measurements indic…
Temperature-dependent Raman spectroscopy and X-ray diffraction studies have been carried out on NH(4)HSO(4) single crystals in the temperature range 77-298 K. Two structural transitions driven by the molecular ordering and change in crystal symmetries are observed below 263 and 143 K. These phase transitions are marke…
In this work a new passivation method is proposed for multicrystalline silicon wafers. This method combines the use of porous silicon (PS) and silicon nitride (SiN) coating. SiN thin film is deposited on porous silicon by the plasma-enhanced chemical vapor deposition (PECVD) technique at low temperature and investigat…
In this paper, we study the optical, optoelectronic and photoluminescence properties of stain-etched porous silicon nanostructures obtained with different etching times. Special attention is given to the use of the stain-etched PS as an antireflection coating as well as for surface passivating capabilities. The surfac…
High quality γ-BiB 3 O 6 single crystals up to 16 × 18 × 32 mm 3 in size were grown by the Kyropoulos technique. Indexes of the faces for as grown γ-BiB 3 O 6 single crystals were determined, and transmission spectra were recorded in polarized light. The band gap was found to be E g = 3.982, 3.968, and 4.008 eV at 300…
(Ba0.8Sr0.2)(Zr0.2Ti0.8)O3 (BSZT) films were grown on La0.5Sr0.5CoO3 buffered (001) SrTiO3 substrates by pulsed laser deposition. Effects of Co doping on electrical properties of the films were investigated to establish material design through defects control. The doping led to a significant improvement in the electri…
An ongoing problem in the study of a classical many-body system is the characterization of its equilibrium behaviour by theory or numerical simulation. For purely repulsive particles, locating the melting line in the pressure-temperature plane can be especially hard if the interparticle potential has a softened core o…
Hybrid solar cells (HSCs) incorporating narrow band gap PbSSe nanocrystals (NCs) in a conjugated polymer were developed for the extensive use of solar radiation up to the near infrared (NIR) range. The developed cell, composed of poly(3-hexylthiophene) (P3HT):PbSSe NC composites with 1:1 weight ratio, exhibited a larg…
A new low molecular-weight gelator G1 having hydrozone and azobenzene groups was designed and synthesized. The corresponding organogel from G1 exhibited multistimuli responsive capability by tuning the hydrogen-bonding and amphiphilic properties.
The metal-insulator (MI) transition in LiV${}_{2}$O${}_{4}$ has been studied by optical measurements in infrared regions at low temperatures and under high pressures. At 40 K, the metal phase under ambient pressure changes gradually into the insulating state under pressures above 7 GPa, where the newly opened $2\ensur…
Ethylene vinyl acetate copolymer (EVA) nanocomposites were prepared by melt blending of EVA with nano-sized magnesium hydroxide [Mg(OH) 2 ] and modified montmorilonite clay. Nano Mg(OH) 2 was synthesized in the laboratory by matrix-mediated growth and controlled technique. Particle size of Mg(OH) 2 crystals was perfor…
Torsion-induced mechanical couplings of single-walled carbon nanotubes (SWCNTs) are studied by using molecular dynamics simulations. We show that these mechanical couplings are strongly dependent on the chirality of SWCNTs. In particular, the structural difference between armchair and zigzag nanotubes can remarkably i…
BACKGROUND AND PURPOSE: Phospho-ibuprofen (P-I; MDC-917) inhibits the growth of colon cancer in mice. Here, we investigated the use of nanocarriers to improve its pharmacokinetics (PKs) and anti tumour efficacy. EXPERIMENTAL APPROACH: The cellular uptake and cytotoxicity of P-I encapsulated into liposomes and micelles…