Materials Literature
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Abstract Summary: Poly( D , L ‐lactide) with a molar mass of 10 5 g · mol −1 and a yield over 90% was produced in 10 min by the ring‐opening polymerization of D , L ‐lactide under microwave irradiation with forward power of 255 W. A degradation of the poly( D , L ‐lactide) was also induced by microwaves with a power l…
Multiwall carbon nanotubes (MWNTs) were synthesized via the decomposition of CCl4 in supercritical CO2 at 175 degrees C and 27.6 MPa using an iron-encapsulated dendrimer as a growth catalyst. The average diameter of resultant nanotubes was 20-25 nm, obtained after a 24-h reaction time. Our conditions represent the fir…
Formylglycinamide ribonucleotide amidotransferase (FGAR-AT) catalyzes the ATP-dependent conversion of formylglycinamide ribonucleotide (FGAR) and glutamine to formylglycinamidine ribonucleotide (FGAM), ADP, P(i), and glutamate in the fourth step of the purine biosynthetic pathway. In eukaryotes and Gram-negative bacte…
UV illumination of semiconducting single wall carbon nanotubes (SWNTs) results in a substantial increase of the intensity of the first interband transition (S 11 ) followed by dark or IR light induced restoration of the initial intensity. The intensity of the S 11 transition could also be modulated by light-induced re…
The magnetic ordering in ${\mathrm{Mn}}_{2}\mathrm{O}\mathrm{B}{\mathrm{O}}_{3}$ has been determined from neutron diffraction and magnetization measurements. Long range antiferromagnetic order occurs below ${T}_{N}=26\phantom{\rule{0.3em}{0ex}}\mathrm{K}$, other apparent magnetic transitions are due to secondary phase…
Catalytic formation of N(2)O via a (NO)(2) intermediate was studied employing density functional theory with generalized gradient approximations. Dimer formation was not favored on Pt(111), in agreement with previous reports. On Pt(211) a variety of dimer structures were studied, including trans-(NO)(2) and cis-(NO)(2…
The electrical conductance of 0.8∼5-µm-long multiwalled carbon nanotubes (MWCNT) was measured at room temperature in a multiprobe scanning tunneling microscope (STM)-scanning electron microscope (SEM) system and a conventional prober system, by bringing the MWCNTs into contact with patterned metal electrodes. The cont…
An etching technique called phase-change etching was developed. In this technique, only crystalline regions in a phase-change recording film are selectively etched by an alkaline solution, and amorphous regions remain on the sample surface, which means that a phase-change recording film can be used as a resist for pat…
The 4-(2'-pyridyl)-1,2,3,5-dithiadiazolyl neutral radical 1 has been prepared for use as a spin-bearing bidentate ligand. The coordination of this ligand to bis(hexafluoroacetylacetonato)cobalt affords a thermally stable complex 2. Magnetic susceptibility measurements of the crystalline complex indicate ferromagnetic…
Titanium-rich $\mathrm{PZT}$ solid solutions were studied under high pressure by neutron and x-ray diffraction, Raman spectroscopy and dielectric measurements. The results show that high pressure stabilizes the ferroelectric monoclinic phases, which are proposed to be responsible for the high piezoelectric properties…
The adsorption properties of NO molecule on anionic, cationic, and neutral Au(n) clusters (n=1-6) are studied using the density functional theory with the generalized gradient approximation, and with the hybrid functional. For anionic and cationic clusters, the charge transfer between the Au clusters and NO molecule a…
l -Aspartic acid ( l -Asp) has been intercalated into magnesium−aluminum layered double hydroxides by coprecipitation. The structure and composition of the intercalated material have been studied by X-ray diffraction, inductively coupled plasma emission spectroscopy, and elemental analysis. A schematic model of the in…
Uniform-sized mesoporous carbons having high surface areas and various structures were synthesized directly by the carbonization of P123 triblock copolymer/phenol−resin/silica nanocomposites, which were prepared from the sol−gel polymerization of silica in the presence of Pluronic P123 triblock copolymer and phenol an…
Abstract Summary: The preparation and characterization of a new type of nanocomposite material that is based on biodegradable polylactide (PLA) and organically modified layered titanate, is reported. Layered titanate, modified with a N ‐(cocoalkyl)‐ N , N ‐[bis(2‐hydroxyethyl)]‐ N ‐methylammonium cation, was used as a…
We describe here liquid drops in rotation, and first classify the different shapes possible. Then, we study the behaviour of liquid marbles, which are droplets coated with hydrophobic grains, running down inclines. Because these marbles roll as they move, this device allows us to achieve revolving drops. We report the…
Dynamical heterogeneities in a colloidal fluid close to gelation are studied by means of computer simulations. A clear distinction between some fast particles and the rest, slow ones, is observed yielding a picture of the gel composed of two populations with different mobilities. Analyzing the statics and dynamics of…
The high-temperature ferromagnetism in Co-doped ZnO samples fabricated by the standard solid-state reaction method is reported. Additional Cu doping into bulk Zn0.98Co0.02O is essential to achieve room-temperature ferromagnetism. Structure and composition analyses revealed that cobalt is incorporated into the lattice…
We discuss the central issues to be addressed for realizing carbon nanotube (CNT) nanoelectronics. We focus on selective growth, electron energy bandgap engineering and device integration. We have introduced a nanotemplate to control the selective growth, length and diameter of CNTs. Vertically aligned CNTs are synthe…
High-density ZnO nanorods can be grown on pregrown one-dimensional nanostructures via thermal chemical vapor deposition of Zn at a low temperature of 500 °C, producing various heterostructures. We demonstrate it using carbon nanotubes, GaN nanowires, GaP nanowires, SiC nanowires, and SiC core−C shell coaxial nanocable…
Stable field emission is realized from well-separated tetrapod-like ZnO nanostructures with high purity. The ZnO nanostructures are painted on a highly doped silicon substrate covered by a Au layer with a thickness of 300nm. An emission current density of 18mA∕cm2 is obtained and degradation was not observed over a th…