Materials Literature
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The iso-frequency contours of diffracted surface plasmons on metallic bigratings have been directly recorded using imaging scatterometry. Metallic rectangular bigratings, formed of two “crossed” surface relief gratings, are used to demonstrate this measurement technique. By deepening one of the constituent gratings, c…
Special high-resistive substrates for graphene sheets are suggested with the aim of providing high conductivity and mobility of charge carriers in graphene. The substrates were created from N -methylpyrrolidone-intercalated few-layer graphene (FLG) using anneals given to FLG samples in the temperature range 100–180 °C…
Graphene quantum dots, nanoribbons, and nanographene are great promising in various applications owing to the quantum confinement and edge effects. Here we evidence the presence of epitaxial nanographene on SiC. Morphology and electronic structure of the graphene layers have been analyzed by SPELEEM. Using Scanning Tu…
The preparation of gels of poly(dimethylsiloxane) (PDMS) reported in the literature so far involves catalysts and chemical cross-links (chemical gels) or functionalization with organogelators. We report that thermoreversible physical gels of PDMS, without cross-links or functionalization, can be made with propylamine…
Molded magnets: The co-assembly of silica colloids and iron oxide nanoparticles in a PDMS mold gives magnetic responsive microparticles. When dispersed in an aqueous solution (see picture), the microparticles could rotate and flip under the action of a magnetic field (1 kG). The particles could also be reversibly swit…
We combine forced hydrolysis and homogeneous precipitation to synthesize metal-oxide precursors with spherical core/shell morphology. The core consists of an amorphous Er x Yb y Zr 1– x – y O 2 precursor, and the shell consists of an amorphous Eu 0.02 Y 1.98 O 3 precursor. Upon heating, the doped metal-oxide precursor…
Exciton dynamics of CdS films have been investigated using ultrafast laser spectroscopy with an emphasis on understanding defect-related recombination. Two types of CdS films were deposited on glass substrates via direct current pulse sputtering (DCPS) and chemical bath deposition (CBD) techniques. The films displayed…
We study the influence of a magnetic flux tube on the possibility to electrostatically confine electrons in a graphene quantum dot. Without a magnetic flux tube, the graphene pseudospin is responsible for a quantization of the total angular momentum to half-integer values. On the other hand, with a flux tube containin…
The effect of intentional surface oxide formation on band-edge photoluminescence (PL) of Ge nanowires was investigated. Thermal oxidation in molecular O2 was used to produce a surface oxide layer on assemblies of single crystal nanowires grown by the vapor-liquid-solid method. With increasing oxidation of the wires, t…
We study the spin-polarized $\ensuremath{\nu}=0$ Landau-level state of graphene. Due to the electron-hole attractive interaction, electrons and holes can bound into pairs. These pairs can then condense into a spin-triplet superfluid ground state: a spin superconductor state. In this state, a gap opens up in the edge b…
SrTi1−xNbxO3 films with cubic structure were grown on LaAlO3 single crystal substrates by pulsed laser deposition, in which the inclination angle of the (001) plane orientation was in strict accordance with 10° against the film surface. The maximal peak value of transverse thermoelectric voltage of up to 6.88 V was ob…
Ru(II) complexes with chelating ligands, 4',5'-ethylenedithiotetrathiafulvenyl[4,5-f][1,10]phenanthroline (L1), 1,3-dithiole-2-thiono[4,5-f][1,10]phenanthroline (L2), and 1,3-dithiole-2-ono[4,5-f][1,10]phenanthroline (L3), have been prepared and their structural, electrochemical, and photophysical properties investiga…
Ammonia borane dehydrogenation can be catalyzed by a number of organometallic species. [Ir(κ 2 -I t Bu) 2 ][PF 6 ] (I t Bu = 1,3-bis( tert -butyl)imidazol-2-ylidene) is the most active catalyst for this process that has been reported to date. We explore herein the absolute limits of the use of this and related complex…
The aim of this study was to investigate the performance of UHMWPE/HDPE-reinforced kenaf, basalt and hybrid kenaf/basalt composites. Mechanical testing of these samples was carried out such as tensile, flexural (three-point bending) and an impact test (Charpy). Pure resin (UHMWPE/HDPE) samples were tested and compare…
The present work deals with the development of polyurethane–clay nanocomposite foams by replacing part of the synthetic polyol with castor oil derivative. Hydroxylated castor oil was converted into diethanol amide by transamidation and the resulting polyol was formulated into water‐blown foams. Modified montmorillonit…
Highly oriented poly(lactic acid) (PLA)/thermoplastic polyurethane (TPU) blends were fabricated through solid hot stretching technology in an effort to improve the mechanical properties and blood biocompatibility of PLA as blood‐contacting medical devices. It was found that the tensile strength and modulus of the blen…
The purpose of this study was to develop a specific targeting magnetic nanoparticle probe for magnetic resonance imaging and therapy in the form of local hyperthermia. Carboxymethyl dextran-coated ultrasmall superparamagnetic iron oxide nanoparticles with carboxyl groups were coupled to cyclic arginine-glycine-asparti…
Silver nanoparticles (AgNPs) ranging from 2.5 to 7.1 nm in diameter with a narrow size distribution are prepared by reducing different silver phosphine precursors RAg(PPh 3 ) n (R = Cl, Br, or NO 3 and n = 1 or 3) with tert -butylamine borane (TBAB) in the presence of dodecanethiols (C 12 ) at a temperature between 10…
A novel polylactide/poly(butylene succinate) composite via cross-linking with methylene diphenyl diisocyanate was used. The methylene diphenyl diisocyanate (MDI) was to couple with end hydroxyl of polylactide and poly(butylene succinate) by a torque rheometer and the samples were compression molded into plate successf…
Using ab initio density functional theory, we investigate how hydrogen interacts with Pt–Au bimetallic nanoparticles (NPs) of various compositions. Several Au, Pt, and Pt–Au NPs of 85 atoms are considered. The results indicate that both the adsorption energy and the geometry of the most favorable adsorption sites are…