Materials Literature
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Abstract Polypropylene blends with polyhedral oligomeric silsesquioxanes (POSS) bearing different alkyl groups were investigated to elucidate the effect of the alkyl group length on the mechanical behavior of the blends. In particular, blends of polypropylene (PP) with either octamethyl‐POSS, octaisobutyl‐POSS, or iso…
We report the creation and properties of colloidally stable shell-cross-linked cylindrical organometallic block copolymer micelles with adjustable length and swellability. The one-dimensional (1D) structures with semicrystalline polyferrocenylsilane (PFS) cores and polyisoprene (PI) coronas were initially self-assembl…
The structural environment of substitutional Cr3+ ion in MgAl2O4 spinel has been investigated by Cr K-edge Extended X-ray Absorption Fine Structure (EXAFS) and X-ray Absorption Near Edge Structure (XANES) spectroscopies. First-principles computations of the structural relaxation and of the XANES spectrum have been per…
$(\mathrm{TMTSF}{)}_{2}{\mathrm{ClO}}_{4}$ is a quasi-one-dimensional organic conductor and superconductor with ${T}_{c}=1.4\text{ }\text{ }\mathrm{K}$, and one of at least two Bechgaard salts observed to have upper critical fields far exceeding the paramagnetic limit. Nevertheless, the $^{77}\mathrm{Se}$ NMR Knight s…
It has recently been suggested that exchange spring media offer a way to increase media density without causing thermal instability (superparamagnetism), by using a hard and a soft layer coupled by exchange. Victora has suggested a figure of merit xi = 2 E_b/mu_0 m_s H_sw, the ratio of the energy barrier to that of a…
This paper reports the synthesis of platelike CeO 2 nanoparticles by a simple, cost-effective, and environmentally friendly method using cerium(III) acetate hydrate and freshly extracted egg white (ovalbumin) in an aqueous medium. A platelike structure of CeO 2 nanoparticles having the particle size of 6−30 nm was obt…
We describe the synthesis, characterization, and use of hybrid nanoparticles with a superparamagnetic iron oxide (SPIO)−silica core and a gold nanoshell. These multifunctional nanoparticles, designated SPIO−Au nanoshells, displayed superparamagnetic characteristics and a significant absorbance in the near-infrared (NI…
We present a Raman scattering study of wurtzite $\mathrm{ZnO}$ over a temperature range from 80 to $750\phantom{\rule{0.3em}{0ex}}\mathrm{K}$. Second-order Raman features are interpreted in the light of recent ab initio phonon density of states calculations. The temperature dependence of the Raman intensities allows t…
Layered graphite oxide is used as host material for the synthesis of conducting polymer intercalated nanocomposites. Powder X-ray diffraction, Fourier transform infrared, and UV-VIS absorption spectra indicate the formation of polyaniline within the interlamellar spaces of graphite oxide. The red shift of UV-VIS absor…
Bimetallic Ag-Au nanoparticles are synthesized by sequential deposition of Au and Ag on amorphous silica by Radio Frequency (RF)-sputtering under mild conditions. Specimens are thoroughly characterized by a multi-technique approach, aimed at investigating the system properties as a function of the Ag/Au content, as we…
Practical protocols are presented to reproducibly prepare micrometer-sized Au(111) substrates. Au(111) terraces of micrometer dimensions and atomic smoothness were crystallized by flame-annealing vacuum-deposited gold films on glass and on millimetric amorphous gold shots. Gold films and shots that were slowly cooled…
Electronic structure and magnetic properties of CoS2 with a cubic-pyrite-type structure have been studied by a first-principles density functional theory (DFT) calculation using a linear muffin-tin orbital method within the framework of the generalized gradient approximation for the treatment of exchange-correlation e…
Ferromagnetic III–Mn–V semiconductors such as GaMnAs represent systems in which electronic and magnetic properties are closely intertwined, which results in entirely new effects in electrical transport. We illustrate this by the unique and somewhat unexpected magnetotransport phenomena observed in GaMnAs films grown o…
Novel composites for supercapacitors: Carbon–Ru nanocomposites with mesoporous structures and homogeneously dispersed Ru nanoparticles in the carbon matrix (see SEM and TEM images), obtained by a simple pyrolysis procedure, display capacitive properties for supercapacitors.
We have investigated the fluorescence properties of dendrimers (Gn is the dendrimer generation number) containing four different luminophores, namely terphenyl (T), dansyl (D), stilbenyl (S), and eosin (E). In the case of T, the dendrimers contain a single p-terphenyl fluorescent unit as a core with appended sulfonimi…
The praseodymium-aluminum perovskite−praseodymium oxide, PrAlO 3 −Pr 2 O 3, eutectic has been studied. The growth of the eutectic by the micro-pulling down method is presented. The PrAlO 3 −Pr 2 O 3 is not air-stable. The cause of the eutectic instability is the instability of the Pr 2 O 3 phase. When exposed to air,…
In this work, we present the size-controlled preparation of silica-filled micelle cores and their self-assembly behavior, which is dependent on the block lengths, different coating techniques, and substrates. Furthermore, we present a way to use these structures as templates for highly ordered magnetic nanostructures,…
Polyaniline (Pani) thin films doped with camphor sulfonic acid (CSA) have been deposited on glass substrates using the spin coating technique. Pani is chemically synthesized by an oxidation method at ∼0 °C. Pani-CSA films show a hexagonal structure in scanning electron micrographs, which occurs due to the crystalline…
Chitosan was used to encapsulate both CdSe/ZnS quantum dots (QDs) and the magnetic resonance imaging (MRI) contrast agent gadolinium-diethylenetriaminepentaacetate (Gd-DTPA), forming multi-functional nanoparticles that can be used in a wide range of in vitro or in vivo studies as fluorescent biological labels as well…
High Resolution Image Download MS PowerPoint Slide The growth of single-walled carbon nanotubes (SWNTs) in a chemical vapor deposition (CVD) system is a complex process. In a typical growth mechanism, the process includes the nucleation stage, the growth stage, and the termination stage. However, most nanotube growth…