Materials Literature
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The translational dynamics of the low molecular weight glass-former tris(naphthylbenzene) have been studied on the length scale of a few nanometers at the glass transition temperature Tg. Neutron reflectivity was used to measure isotopic interdiffusion of multilayer samples created by physical vapor deposition. Deposi…
Desulfation processes were investigated over sulfated Pt-BaO/Al2O3 with different barium loading (8 and 20 wt %) by using H2 temperature programmed reaction (TPRX), transmission electron microscope (TEM) with energy dispersive spectroscopy (EDS), sulfur K-edge X-ray absorption near-edge spectroscopy (XANES), and in si…
Magnetostrictive Fe 100− x Ga x alloys over the composition range 0< x <36 have been prepared by combinatorial sputtering methods. These films were investigated by x-ray diffraction and 57 Fe Mössbauer effect spectroscopy techniques that have been adapted for the efficient study of combinatorial samples. X-ray diffrac…
Energetics of pairs and seven membered bundles formed by achiral as well as chiral carbon nanotubes is explored. The applied model Hamiltonian consists of a tight binding intratube part, an intermolecular hopping term, and a Lennard-Jones pair potential. Heterochiral aligned tube pairs are found the most stable energe…
We report on adhesive-free bonded (AFB"R") CVD diamond surfaces of 2 to 3 nm rms roughness to sapphire, YAG and optically coated YAG surfaces to form robust and stress free composite components. Considering the high thermal conductivity of CVD diamond with respect to YAG or sapphire, AFB"R" diamond/sapphire and diamon…
A multilayer surface-enhanced Raman scattering (SERS) substrate geometry providing significantly greater SERS enhancements, longer active lifetimes, better reproducibility, and lower detection limits for trace chemical analysis than traditional SERS substrates has been developed. We have fabricated and characterized t…
We report the design and construction of tunable organic clay mimic structures with one-dimensional supramolecular synthons and aromatic tectons. By connecting the robust one-dimensional synthons with dicarboxylic acids, we succeeded in introducing the tectons into layer motifs. Therefore, the structures enable us to…
Vanadium oxide VOx films were deposited by reactive RF magnetron sputtering by applying a substrate bias, in which the Ar ions in plasma impacted the growing film surface. The vanadium valence of the VOx film decreased when the substrate negative bias voltage was increased. The VO2 film was successfully deposited at a…
Abstract Length scale hierarchy in gelatin sol, gel, and coacervate (induced by ethanol) phases, having same concentration of gelatin in aqueous medium (13% w/v), has been investigated through small angle neutron scattering and rheology measurements. The static structure factor profile, I ( q ) versus wave vector q ,…
Well-controlled electrically conducting rubbers are ideal systems for addressing longstanding questions about intrachain electronic transport mechanisms, intractable for classical conducting polymers except at a very local scale. These doped gels permit observation of macroscopic electromechanical effects, such as cha…
The chemical vapour synthesis (CVS) route is a versatile process that can be used for the synthesis of nanocrystalline ceramics with very small crystallite sizes having a narrow particle size distribution. In this study, a CVS technique was used to prepare nanocrystalline titania from tetraisopropyl orthotitanate at a…
ZnO nanoparticles were fabricated in sapphire (α-Al(2)O(3) single crystal) by Zn ion implantation (48 keV) at an ion fluence of 1 × 10(17) cm(-2) and subsequent thermal annealing in a flowing oxygen atmosphere. Transmission electron microscopy (TEM) analysis revealed that metallic Zn nanoparticles of 3-10 nm in dimens…
A series of high-quality, coherently strained $[{\mathrm{La}}_{2∕3}(\mathrm{Ca}\phantom{\rule{0.3em}{0ex}}\mathrm{or}\phantom{\rule{0.3em}{0ex}}\mathrm{Ba}{)}_{1∕3}{\mathrm{MnO}}_{3}∕{\mathrm{SrTiO}}_{3}]\ifmmode\times\else\texttimes\fi{}N$ superlattices has been prepared on $(100)\phantom{\rule{0.3em}{0ex}}{\mathrm{S…
Silver nanorods were prepared by a seed-mediated growth approach, and self-assembled into two-dimensional ordered arrays on glass substrates. The polarization-dependent optical responses of the rods were measured, which indicated ordered alignment. These arrays were evaluated as potential surface-enhanced Raman spectr…
Surface hydrolysis of polyester scaffolds is a convenient technique suggested to promote protein adsorption for improving cell attachment. We have, therefore, investigated the effect of hydrolysis of polyester surfaces for protein adsorption to clarify the conditions needed. Three polyesters, poly(ethylene terephthala…
We present density-functional theoretical results of structural, electronic, and optical properties of ligand-free ${\mathrm{Zn}}_{m}{\mathrm{Se}}_{n}$ clusters as a function of size of the cluster. We have optimized the structure, whereby our initial structures are spherical parts of either zinc blende or wurtzite cr…
The ac and dc conductivities (σ ac and σ dc ) of amorphous semiconductor Sm doped Se (namely, SeSm 0.005 ) films, prepared by thermal evaporation, were measured under vacuum in a wide range of frequency and temperature. The ac conductivity versus frequency plots were analysed by considering a power law: σ ac ∝ ω s ( s…
It′s a wrap! Alginic acid can efficiently solubilize multi-walled carbon nanotubes (MWCNTs) in aqueous solution (see figure). The addition of cations to the alginic-acid-wrapped MWCNTs results in their precipitation from aqueous solution. However, subsequent treatment with EDTA selectively redispersed those MWCNTs tha…
Key characteristics of a newly prepared tissue-equivalent, highly sensitive thermoluminescence dosimeter, Li 2 B 4 O 7 :Cu,Ag,P, are presented. The material was developed at the Institute of Nuclear Sciences, Belgrade, in the form of sintered pellets. A new preparation procedure has greatly increased the sensitivity o…
In case of typical chemical gas sensors reacted by gas adsorption on surface of anactive layer, it is difficult to detect some gases which have low chemical adsorption energylike inert gases. In this paper, we report a gas sensor using carbon nanotube(CNT) array aselectron emitters for the purpose of detecting these g…