Materials Literature
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We report the observation of blackbody radiation from aligned multiwalled carbon nanotubes undergoing field emission. The light intensity correlates with fluctuations in the emission current. The onset of light emission occurs at an emission current of 1 mA/cm2 and corresponds to a temperature on the order of 1550 K.…
High-resolution angle-resolved photoemission spectroscopy (ARPES) on the quasi-one-dimensional Peierls system ${\mathrm{K}}_{0.3}{\mathrm{MoO}}_{3}$ reveals a ``hidden'' open Fermi surface and band features displaying the symmetry properties of the underlying lattice. However, the ARPES line shapes and optical data su…
The reversible charging of multiple layers of nanocrystals (NCs) at room temperature has been achieved by using a simple, solid-state device. This reversible charging leads to the possibility of using NCs in optical modulators and in tunable fluorescent or photochromic displays. These structures should also allow syst…
A novel family of photochromic amorphous molecular materials containing a dithienylethene moiety, 1-{5-[4-(di-p-tolylamino)phenyl]-2-methylthiophen-3-yl}-2-(2,5-dimethylthiophen-3-yl)-3,3,4,4,5,5-hexafluorocyclopentene, 1-{5-[4-(di-p-tolylamino)phenyl]-2-methylthiophen-3-yl}-2-(2-methylbenzo[b]thiophen-3-yl)-3,3,4,4,5…
The microstructural evolution and thermal properties of nanocrystalline (nc) Cu during mechanical attrition were investigated by using quantitative x-ray-diffraction and thermal analysis techniques. Upon milling of the Cu powders with coarse grains, the grain sizes are found to decrease gradually with the milling time…
Well-aligned carbon nanowalls with a thickness of a few nanometers and a lateral size in the micrometer range have been grown on various types of substrates. The nanowalls exhibit a remarkably different surface morphology as compared to fullerenes and carbon nanotubes, in particular their two-dimensionality and high s…
The purpose of this work was to synthesize and characterize a pH- and temperature-sensitive block copolymer containing repeating sequences from silk (Gly-Ala-Gly-Ala-Gly-Ser) and elastin (Gly-Val-Gly-Val-Pro) protein. The monomer contained one repeat of silk and eight repeat units of elastin, with the first valine in…
Uniform and smooth BN coatings on SiC nanowires have been obtained by a simple vapor–liquid–solid (VLS) process using Ni as catalyst. SiO and B2O2 gases, simultaneously generated by heating boron and silicon oxide at high temperature, are used as precursors for the VLS growth. The BN-coated semiconductor nanowires cou…
The molecular chaperone Hsp90 sequesters oncogenic mutants of the tumor suppressor p53 that have unstable core domains. It is not known whether p53 is bound in an unfolded, partly folded, or distorted structure, as is unknown for the structure of any bound substrate of Hsp90. It is a particularly difficult problem to…
Novel composites of bioactive beta-tricalcium phosphate [Ca(3)(PO(4))(2)] and biodegradable copolymerized poly-L-lactide (CPLA) were prepared by a heat-kneading method. The mechanical and chemical changes of the composites were evaluated in vitro by soaking in physiological saline and Dulbecco's phosphate buffered sal…
Silsesquioxane polymers have been successfully used as the dielectric layer in organic field-effect transistors (FETs) deposited on robust, plastic substrates. Performance comparable to that found with silicon substrates having SiO2 as the active dielectric layer was observed with six p- and n- channel organic semicon…
Selective ion adsorption can be carried out with mesostructured metal ion adsorbents in which the ligand groups are included inside the framework walls (see Figure), as is demonstrated here. Another important feature of these materials is that the pore channels are not obstructed by functional groups, thus making it p…
Big CaCO3 spherules with controlled surface structures and sizes ranging from several hundreds of nanometers and micrometers can be easily fabricated through a slow gas–liquid diffusion reaction at room temperature by using double-hydrophilic block copolymers (DHBCs) as crystal modifiers. The influence of the DHBCs wi…
This paper reports detailed lattice dynamics studies involving experimental Raman scattering measurements and theoretical rigid ion model calculations of the rare earth aluminum garnets (RE3Al5O12). The studies are fairly involved as these garnets have complex crystal structure with 80 atoms/primitive cell. Our calcul…
We present a study on the kinetics of oxygen adsorption and desorption from single-wall carbon nanotube (SWNT) and highly oriented pyrolytic graphite (HOPG) samples. Thermal-desorption spectra for SWNT samples show a broad desorption feature peaked at 62 K, which is shifted to a significantly higher temperature than t…
Raman microscopy is used to study the evolution of vibrational modes of vanadium dioxide single crystals and thin films in the vicinity of the phase transition. The results support the electron correlation model of phase transformation.
We demonstrate that multiwalled BxCyNz nanotubes can be efficiently converted to BN multiwalled nanotubes via an oxidation treatment. The microstructure and composition of the precursors and final products have been characterized by high-resolution transmission electron microscopy, electron energy-loss spectroscopy, a…
Ultralow dielectric constants have been achieved for thin porous films of high-Tg polymers. Rapid solid-state polymer expansion applying supercritical carbon dioxide was used to create nanosized cavities in thin films of aromatic polyimides (see Figure). Foamed films with spherical voids less than 10 nm in size as wel…
Sr 4 Al 14 O 25 : Eu , Dy material with an extraordinarily long afterglow was synthesized via a traditional ceramic processing. Such a long afterglow observed can last over 20 h at recognizable intensity level (0.32 mcd/m2), which is attributed to energy exchange between the traps and emission states resulting from Dy…
Flat silver nanocrystals have been synthesized by using a soft chemical procedure that involves mixing two reverse micellar solutions. The resulting “nanodisks” display highly anisotropic optical properties attributed to their shape anisotropy. A dark-field TEM image of such a nanodisk, illustrating its single crystal…