Materials Literature
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We report a method for describing plasticity in a broad class of amorphous materials. The method is based on nonlinear (geometric) deformation theory allowing the separation of the plastic deformation from the general deformation tensor. This separation allows an adequate pattern of thermodynamical phenomena for plast…
The speed of longitudinal sound waves at 7 and 22 MHz has been measured in liquid, supecooled, and amorphous selenium, including the region around the glass transition temperature, Tg, near 35 C. In amorphous selenium the speed of shear waves at 7 MHz was also measured. The experiments were performed with high purity…
Single crystal In(OH) 3 nanocubes were synthesized by a designed novel hydrothermal treatment, and the size can be simply moderated by varying the hydrothermal temperature. By calcining the In(OH) 3 nanocubes in air at 400 °C, single crystal In 2 O 3 nanocubes were also prepared with the size slightly shrinking. Room…
The scalable superacid solvent, radical-initiated aryldiazonium functionalization process produces individual SWNTs without the need for surfactant wrapping, centrifugation, or sonication. This work provides a facile pathway to aryl sulfonic acid-functionalized SWNTs that are not roped or bundled, and the functionaliz…
Alloying with Si is shown to destabilize the strongly bound hydrides LiH and MgH 2 . For the LiH/Si system, a Li 2.35 Si alloy forms upon dehydrogenation, causing the equilibrium hydrogen pressure at 490 °C to increase from approximately 5 × 10 -5 to 1 bar. For the MgH 2 /Si system, Mg 2 Si forms upon dehydrogenation,…
Porous microparticles of calcium carbonate with an average diameter of 4.75 microm were prepared and used for protein encapsulation in polymer-filled microcapsules by means of electrostatic layer-by-layer assembly (ELbL). Loading of macromolecules in porous CaCO3 particles is affected by their molecular weight due to…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTNanostructured Oxides in Chemistry: Characterization and PropertiesM. Fernández-García, A. Martínez-Arias, J. C. Hanson, and J. A. RodriguezView Author Information Instituto de Catálisis y Petroleoquímica, CSIC, C/ Marie Curie s/n, Campus Cantoblanco, 28049-Madrid, Spain, an…
Periodic luminescent patterns based on active color centers have been efficiently created in Lithium Fluoride (LiF) crystals and films by Extreme Ultra-Violet (EUV) light and soft x-rays from a laser-plasma source by masking the incoming radiation. Strong visible photoluminescence at room temperature has been measured…
Density functional calculation are performed to study Ti(8)C(12) isomers (T(d), C(3v), and D(2d)) in the neutral, cationic, and anionic charge states. C(3v) symmetry is found to be the most stable geometry for the neutral and anion, and the C(3v) and D(2d) isomers to be quasi-iso-energetic lowest for the cation. The e…
We have carried out first principles plane wave density-functional theory calculations to study the adsorption of CO molecule on a clean and unreconstructed Cu (110) surface at 1/12 monolayer coverage and have investigated the subsequent oxidation by preadsorbed oxygen atoms. As found experimentally, the CO adsorbs pe…
Katherine A. Kantardjieff, Mortaza Jamshidian, Bernhard Rupp; Distributions of pI versus pH provide prior information for the design of crystallization screenin
Ferrimagnetic resonance (FMR) measurements in thin films of $\mathrm{V}{[\mathrm{TCNE}]}_{x}$ grown by chemical vapor deposition exhibit a series of sharp lines at $300\phantom{\rule{0.3em}{0ex}}\mathrm{K}$. The orientational dependence of these lines is a result of the sample geometry provided the magnetization track…
Subpicosecond pump−probe transient absorption spectroscopy has been used to examine the probe wavelength-dependent kinetics of PVP capped CdS/HgS/CdS quantum dot quantum well nanoparticles. Using 398- and 520-nm excitations, the relaxation of the excited hot electrons above the band gap state is characterized by both…
The field-induced alignment of a smectic-A phase is, in principle, a complicated process involving the director rotation via the interaction with the field and the layer rotation via the molecular interactions. Time-resolved nuclear magnetic resonance spectroscopy has revealed this complexity in the case of the direct…
A uniform, monolayer-thick array of Au nanoparticles are produced on an aminopropylthrimethoxysilane-modified glass substrate by simple immersion of the substrate in the sol for 1 h (see AFM image, Figure). Longer immersion causes the nanoparticles to form colloidal domain structures, which induce a second-order polar…
The probability distribution of the internal shear stress generated by systems of straight, parallel edge dislocations is studied. The stress distribution functions of randomly distributed dipoles and walls are calculated analytically. The stress distribution function of relaxed systems is also calculated analytically…
The (111) surface of rutile TiO 2 was prepared with argon ion sputtering and vacuum annealing at 970 K. Scanning tunneling microscope observation revealed nanometer-scale domains of (1 × 1) and (1 × 2) phases on the surface. Formic acid was dissociatively adsorbed on the surface at room temperature. The recombination…
Using large scale molecular dynamics, we study the contact line motion of a liquid meniscus crossed by a moving nanofiber. Varying the amplitude of the liquid/solid interactions, we analyze the shape of the meniscus versus time for a range of velocities. The associated contact angles are estimated by fitting the profi…
Carbon nanotubes have extraordinary mechanical and electronic properties and hold great promise for future applications. The most important aspects of this structure are its low density, high aspect ratio, one dimensionality, high mechanical strength and high electrical and thermal conductivity. We present a short, st…
A novel microarray system that utilizes a porous aluminum-oxide substrate and flow-through incubation has been developed for rapid molecular biological testing. To assess its utility in gene expression analysis, we determined hybridization kinetics, variability, sensitivity and dynamic range of the system using amplif…