Materials Literature
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In this paper, we described the fabrication of hybrid nanocomposite by bottom-up alternating preparation of organic and inorganic layers, toward the mimicking biomineralization process of natural nacre. The organic layers are layer-by-layer (LBL) polymer thin films of diazo-resins (DAR) and poly(acrylic acid) (PAA), w…
We study the problem of impurities and midgap states in a biased graphene bilayer. We show that the properties of the bound states, such as localization lengths and binding energies, can be controlled externally by an electric field effect. Moreover, the band gap is renormalized and impurity bands are created at finit…
Luminescence functionalization of the ordered mesoporous SBA-15 silica was realized by depositing a YVO4:Eu3+ phosphor layer on its surface via the Pechini sol-gel process, resulting in the formation of the YVO4:Eu3+@SBA-15 composite material. This material, which combines the mesoporous structure of SBA-15 and the st…
Abstract We study experimentally and theoretically coupling mechanisms between metamaterial elements of the split ring resonator (SRR) type. We show that, depending on the orientation of the elements relative to each other, the coupling may be either of magnetic or electric type or a combination of both. Experimental…
New surface-modified iron oxide nanoparticles were developed by precipitation of Fe(II) and Fe(III) salts with ammonium hydroxide according to two methods. In the first method, precipitation was done in the presence of D-mannose solution (in situ coating); the second method involved oxidation of precipitated magnetite…
Porous single crystals of Co 3 O 4, NiO, CeO 2, and Cr 2 O 3 were produced using mesoporous silicas, SBA-15 and KIT-6, as hard templates and a new convenient approach, the solid−liquid method, was developed. Characterization of the materials was performed mainly by using X-ray powder diffraction and high-resolution tr…
A length threshold for cell uptake of DNA-wrapped single-walled carbon nanotubes (SWNTs) by human lung fibroblasts (IMR90) is identified. Competitive uptake experiments with well-defined and characterized length fractions show that SWNTs above the length threshold are excluded from the cell, whereas SWNTs labeled with…
The synthesis of xAgI(1-x)[Ag2O.B2O3] amorphous superionic conductors is done via mechanochemical synthesis route (for x = 0.5 and 0.7). Ionic conductivities of 3 mOhm-1cm-1 for x = 0.5 sample and 5mOhm-1cm-1 for x = 0.7 sample at room temperature, are observed, which are higher than those of the melt quenched glassy…
Using a variety of thermodynamic measurements made in magnetic fields, we show evidence that the diffusionless transition (DT) in many shape-memory alloys is related to significant changes in the electronic structure. We investigate three alloys that show the shape-memory effect (In-24 at.% Tl, AuZn, and U-26 at.% Nb)…
Nanoporous and monodispersed Fe 3 O 4 aggregated spheres with high surface area and oriented attachment structure have been successfully prepared by a polyol reduction process. The structure and morphology of the Fe 3 O 4 particles were characterized by X-ray diffraction, scanning electron microscopy, transmission ele…
We have measured magnetization M(T,H), electrical resistivity ro(T,H), thermal conductivity k(T,H), and thermopower S(T,H) of polycrystalline samples of Nd1-xEuxNiO3; 0 <= x <= 0.35; as a function of temperature and external magnetic field. The data indicate a metal-insulator transition (MI) in a wide range of tempera…
We follow in real-time and under controlled conditions the oxidation of the organic semiconductor rubrene grown on SiO_2 using spectroscopic ellipsometry. We derive the complex dielectric function epsilon_1 + i epsilon_2 for pristine and oxidized rubrene showing that the oxidation is accompanied by a significant chang…
Ab initio density-functional theory study suggests that pillared Li-dispersed boron carbide nanotubes is capable of storing hydrogen with a mass density higher than 6.0 weight% and a volumetric density higher than 45 g/L. The boron substitution in carbon nanotube greatly enhances the binding energy of Li atom to the n…
Scandium was substituted for yttrium to observe the effect of unit cell size on the optical metal-to-insulator (MIT) transition in the Y_(1-z)Sc_(z)H_(x) alloy system. The optical transmittance decreases significantly for z>0.10. Simultaneous electrical resistivity measurements confirm the transition from trihydride t…
Abstract The design and fabrication of scaffolds and biodegradable devices using slow‐degrading polymers and composites (degradation/resorption > 2 years) involve the necessity for long‐term in vitro and in vivo studies. If multiple designs and materials need to be tested, then this would use much time and financia…
Artificial superhydrophobic surfaces are typically fabricated by tuning the surface roughness of intrinsically hydrophobic surfaces. We report here the design and fabrication of micro-textures for inducing a superhydrophobic behavior on hydrogen-terminated Si surfaces with an intrinsic water contact angle of approxima…
Many classes of nanoparticles have been synthesized and widely applied, however, there is a serious lack of information concerning their effects on human health and the environment. Considering that their use will increase, accurate and cost-effective measurement techniques for characterizing "nanotoxicity" are requir…
Applying a magnetic field to a ferromagnetic ${\mathrm{Ni}}_{50}{\mathrm{Mn}}_{34}{\mathrm{In}}_{16}$ alloy in the martensitic state induces a structural phase transition to the austenitic state. This is accompanied by a strain which recovers on removing the magnetic field, giving the system a magnetically superelasti…
Atom-transfer radical polymerization (ATRP) is one of the controlled/living radical polymerizations yielding well-defined (co)polymers, nanocomposites, molecular hybrids, and bioconjugates. ATRP, as in any radical process, has to be carried out in rigorously deoxygenated systems to prevent trapping of propagating radi…
Raman spectra of cesium hydrogen sulfate $(\mathrm{Cs}\mathrm{H}\mathrm{S}{\mathrm{O}}_{4})$ were measured in the pressure range of up to $5\phantom{\rule{0.3em}{0ex}}\mathrm{GPa}$ and in the temperature range from room temperature to $300\phantom{\rule{0.2em}{0ex}}\ifmmode^\circ\else\textdegree\fi{}\mathrm{C}$. Two h…