Materials Literature
按标题、摘要、年份、主题和来源检索公开元数据。结果保留作者、摘要、分类与原始来源链接。
The excellent properties of transistors, wires, and sensors made from single-walled carbon nanotubes (SWNTs) make them promising candidates for use in advanced nanoelectronic systems. Gas-phase growth procedures such as the high pressure decomposition of carbon monoxide (HiPCO) method yield large quantities of small d…
By simply supporting carbon nanotubes with a metal substrate of a redox potential lower than that of the metal ions to be reduced into nanoparticles, we have developed a facile yet versatile and effective substrate-enhanced electroless deposition (SEED) method for functionalizing nanotubes with a large variety of meta…
Simulations of electron diffraction patterns for each of the known perovskite tilt systems have been performed. The conditions for the appearance of superlattice reflections arising from rotations of the octahedra are modified to take into account the effects of different tilt systems for kinematical diffraction. The…
Many structural materials (metal alloys, polymers, minerals, etc.) are formed by quenching liquids into crystalline solids. This highly nonequilibrium process often leads to polycrystalline growth patterns that are broadly termed "spherulites" because of their large-scale average spherical shape. Despite the prevalenc…
We have investigated the spin dynamics of the quasi-two-dimensional bilayer manganite ${\mathrm{La}}_{1.2}{\mathrm{Sr}}_{1.8}{\mathrm{Mn}}_{2}{\mathrm{O}}_{7}$, which shows colossal magnetoresistance (CMR) behavior, by inelastic neutron scattering. We have taken advantage of the recently developed multiplexing techniq…
The $^{1}\mathrm{H}$ NMR average effective spin-lattice relaxation rate $1∕{T}_{1}$ has been measured as a function of magnetic field $(4.5--15.6\phantom{\rule{0.3em}{0ex}}\mathrm{T})$ at $T=1$ and $0.3\phantom{\rule{0.3em}{0ex}}\mathrm{K}$, and as a function of temperature $(0.07--1\phantom{\rule{0.3em}{0ex}}\mathrm{…
We report a method of depositing individual 'templated carbon nanotubes' (T-CNTs) on opposing electrodes so that they are suspended across 100 µm deep trenches, and in separate experiments across low profile (70 nm thick) opposing electrodes. The geometry of the electrodes with deep trenches was chosen to be essential…
PURPOSE: To compare the signal characteristics and bolus dynamics of 1.0 M gadobutrol and 0.5 M Gd-DTPA for time-resolved, three-dimensional, contrast-enhanced (CE) MRA of the upper torso. MATERIALS AND METHODS: Ten healthy volunteers were examined with time-resolved three-dimensional CE-MRA (scan time per three-dimen…
Abstract Summary: A simple route to an ordered array of metal/semiconductor oxide composite nanodots is presented. Micellar monolayer films of polystyrene‐ block ‐poly(2‐vinyl pyridine) (PS‐ b ‐P2VP) loaded with HAuCl 4 in the P2VP nanodomains are used as templates. TiO 2 is generated selectively within the polar P2VP…
We report a detailed $^{1}\mathrm{H}$ NMR study on the spin dynamics of single molecule magnets as a function of temperature and external magnetic field. A gradual loss of the $^{1}\mathrm{H}$ NMR signal intensity (wipeout effect) is observed on decreasing the temperature for all the investigated ferromagnetic cluster…
We developed a two fluid atomizer to spray mammalian cells suspended in phosphate buffered saline (PBS)-Pluronic F-127 polymer solutions. We used the device to spray suspensions of bovine articular chondrocytes and porcine tracheal epithelial cells, in either PBS or the polymer solutions, and studied their viability a…
In an attempt to mimic the bamboo's architecture, bamboo-like polymer/silicon nanocomposites were synthesized by filling silicon nanopores with two conjugated polymers, namely poly( p -phenylene vinylene) (PPV) and its derivative poly(2-methoxy-5-(2'-ethylhexyloxy)- p -phenylene vinylene) (MEHPPV). The microstructure,…
Microporous polyvinyl chloride (PVC) with pore size of 0.2–2 µm has been obtained by the foaming of PVC powders using a solution of 2,2'-azo-bis-iso-butyronitrile in a co-solvent of butanone and cyclohexanone. The PVC/CaCO3 hybrid powders deposited with CaCO3 nanoparticles have been synthesized using the microporous P…
We applied a simple yet accurate self-consistent method using the density-functional formalism to study the field-emission properties of nanographite ribbons. We found some properties that are unique to nanostructure arrays, including the field-emission current being dominated by the contribution from off-zone-center…
Liquid anhydrous sulfuric acid forms a partly ordered structure in the presence of single-walled carbon nanotubes (SWNTs). X-ray scattering from aligned fibers immersed in acid shows the formation of molecular shells wrapped around SWNTs. Differential scanning calorimetry of SWNT-acid suspensions exhibits concentratio…
Powder neutron diffraction reveals a subtle triclinic distortion in the 300 K structure of the ${\mathrm{Y}}^{3+}∕{\mathrm{Ba}}^{2+}$ cation-ordered and ${\mathrm{Mn}}^{3+}∕{\mathrm{Mn}}^{4+}$ charge-ordered perovskite ${\mathrm{YBaMn}}_{2}{\mathrm{O}}_{6}({\mathrm{Y}}_{0.5}{\mathrm{Ba}}_{0.5}{\mathrm{MnO}}_{3})$. The…
The occurrences of natural coexisting feldspars including hyalophane and also celsian delineate two-, three- and possibly four-phase fields in the system BaAl2Si2O8—CaAl2Si2O8—NaAlSi3O8—KAlSi3O8. Hyalophane occurs with albite and microcline in a very low grade (anchizonal to epizonal) metasedimentary association from…
Tuning the interfacial area is essential for the optimization of nanostructured CeO 2 in a variety of applications. In this work, we investigate the microstructural mechanism of an oxidation-induced transition from a partially oriented, granular and porous nanostructure to a dense epitaxial one in CeO 2 films deposite…
A weak polyelectrolyte layer-by-layer self-assembled multilayer has several morphologies depending on solution pH, including the morphology of poly(allylamine hydrochloride) (PAH) pH 7.5/poly(acrylic acid) (PAA) pH 3.5, which is called texture structure. We confirmed the initial growth of a weak polyelectrolyte layer-…
Quasi-one-dimensional Cr-based $({d}^{3},S=\frac{3}{2})$ pyroxenes $(\mathrm{Li},\mathrm{Na})\mathrm{Cr}{(\mathrm{Si},\mathrm{Ge})}_{2}{\mathrm{O}}_{6}$ reach long-range magnetic order at low temperatures. At substitution of small size cations ${\mathrm{Li}}^{1+}$ and ${\mathrm{Si}}^{4+}$ for large size cations ${\mat…