Materials Literature
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Oxygen vacancy disorder is very common in RBaCo 2 O 5+δ cobaltites with large rare earths (R). This disorder affects the magnetic interactions and, obviously, the magnetic properties of these compounds. In this work we report the preparation and characterization of a well ordered PrBaCo 2 O 5.50 sample that has allowe…
Rearrangement of twin variants in ferromagnetic shape memory alloy–polyurethane composites studied by stroboscopic neutron diffraction, Feuchtwanger, J, Lázpita, P, Vidal, N, Barandiaran, J M, Gutiérrez, J, Hansen, T, Peel, M, Mondelli, C, O’Handley, R C, Allen, S M
1897-1900
Docetaxel (DX) is one of the most effective antineoplastic drugs. Its current clinical administration is limited because of its hydrophobicity and serious side effects. A polymer/DX conjugate is designed and successfully prepared to solve these problems. It is monomethoxy-poly(ethylene glycol)-block-poly(L-lactide)/DX…
A systematic procedure for producing ZnO nanoparticles by heating ethanol and salt under pressure has been used to make pure ZnO and ZnO doped with cations of all 3d metals from Sc to Cu. When the ZnO is uniformly doped with the 3d cations, the nanoparticles show no ferromagnetism down to 4.2K. However, when the precu…
An experimental configuration that combines the powerful capabilities of a short-term shearing apparatus with simultaneous optical and X-ray scattering techniques is demonstrated, connecting the earliest events that occur during shear-induced crystallization of a polymer melt with the subsequent kinetics and morpholog…
Two samples of the type I clathrate Ba 8 Zn 8 Ge 38 have been prepared by a self-flux method with different cooling rates. Transport properties have been measured for a large single crystal of Ba 8 Zn 8 Ge 38 from the slow cooled batch, and they reveal the sample to be semiconducting. A high Seebeck coefficient of −17…
To measure extremely low concentrations of mercury vapor in gases as encountered in flue gases of coal-fired power plants, accurate and reliable online and/or portable mercury detection systems are needed. As discussed in this communication, resonating silicon-based cantilevers coated with thin films of gold change th…
The tilt boundary that separates the well-known rhombohedral phases $R3m$ and $R3c$ of the $\mathrm{Pb}({\mathrm{Zr}}_{1\ensuremath{-}x}{\mathrm{Ti}}_{x}){\mathrm{O}}_{3}$ solid solution was investigated by means of time-of-flight neutron powder diffraction, dielectric measurements, and resonance Raman spectroscopy. C…
Morphology control is important for practical applications of composite materials that consist of functional polymers and nanoparticles. Toward that end, block copolymers provide useful templates to arrange nanoparticles in the scaffold of self-organized polymer microdomains. This paper reports theoretical predictions…
Abstract An in‐depth study was carried out on the structure and properties of a series of poly(ethyl acrylate)/clay nanocomposites prepared by in situ atom transfer radical polymerization (PNCIs) with well‐defined molecular weights and narrow molecular weight distributions. Wide‐angle X‐ray diffraction and transmissio…
Carbon nanotubes (CNTs) have been perceived as having a great potential in nanoelectronic and nanomechanical devices. Recent advances of modeling and simulation at the nanoscale have led to a better understanding of the mechanical behaviors of carbon nanotubes. The modeling efforts incorporate atomic features into the…
The room-temperature ferromagnetism of reduced anatase (TiO2−δ) is studied using density functional calculation. Two kinds of point defects, titanium interstitial and oxygen vacancy (Ov), have been studied. The calculated magnetization shows that Ov is the point defect substantially related to the observed ferromagnet…
Density functional theory (DFT) was used to study the adsorption of nitrogen monoxide (NO) on the armchair (4, 4), (5, 5), (6, 6), and (7, 7) carbon nanotubes. The effect of molecular orientation on the adsorption process was also studied. Both the external (two modes, N-down and O-down; NO molecular axis perpendicula…
Biodegradable polymer nanofibres have been extensively studied as cell culture scaffolds in tissue engineering. However, long-term in vitro studies of cell-nanofibre interactions were rarely reported and successful organ regeneration using tissue engineering techniques may take months (e.g. blood vessel tissue enginee…
Silicon nanocrystals (Si-nc) and amorphous silicon (α-Si) produced by silicon implantation in fused silica have been studied by micro-Raman spectroscopy. Information regarding the Raman signature of the α-Si phonon excitation was extracted from Raman depth-probing measurements using the phenomenological phonon confine…
The fabrication of gold Fresnel zone plates, by a combination of e-beam lithography and electrodeposition, with a 30 nm outermost zone width and a 450 nm-thick structure is described. The e-beam lithography process was implemented with a careful evaluation of applied dosage, tests of different bake-out temperatures an…
Recombination dynamics in CdTe/CdSe core-shell type-II quantum dots (QDs) has been investigated by time-resolved photoluminescence (PL) spectroscopy. A very long PL decay time of several hundred nanoseconds has been found at low temperature, which can be rationalized by the spatially separated electrons and holes occu…
Katalysator mit Kupferkopf: Ein monomeres γ-Keggin-Silicowolframat mit Bis-μ-1,1-azidodikupfer-Einheit katalysiert die selektive oxidative Homokupplung von aromatischen und aliphatischen Alkinen zu den entsprechenden Diinen (siehe Bild).
Multiporphyrin-modified CdSe nanoparticles (CdSe-H2P) were prepared to elucidate the interaction between chromophores and luminescent semiconducting nanoparticles in the excited and ground states. The CdSe-H2P nanoparticles were obtained by place-exchange reactions of hexadecylamine-thiophenol-modified CdSe nanopartic…