Materials Literature
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Layer-by-layer adsorption of polygenic polyelectrolytes is a promising method of treatment in which multilayers are formed on the inner arterial wall (see scheme). An advantage of this technique, which has already proved successful in animal models, is that it is very simple to apply, in contrast to in situ polymeriza…
Density functional computations (PBE and B3LYP) in conjunction with 3-21G and 6-31G basis sets are used to determine the energy of fluorine atom and CH(2) addition to the sidewall of (5,5) C(30+10)(n)()H(20) (n = 0, 1, 2.18) carbon nanotube slabs. A pronounced oscillation of the addition energy is found for fluorine a…
Abstract Ternary blends of isotactic polypropylene (PP), ethylene–octene copolymer (mPE), and high‐density polyethylene (HDPE) were prepared by melt mixing in a twin‐screw extruder with two different sequences of mixing: the simultaneous mixing of the three components (method I) and the premixing of mPE and HDPE follo…
Abstract Methyl methacrylate and ethylacrylate (MMA‐ co ‐EA) and methyl methacrylate and butylacrylate (MMA‐ co ‐BA) copolymeric processing aids were introduced into poly(vinyl chloride) (PVC)/33.3 wt % wood–sawdust composites containing 0.6 and 2.4 phr of calcium stearate lubricant. The properties of the composites w…
Overlayer thin films of vinylbipyridine (vbpy)-containing Ru and Zn complexes have been formed on top of ruthenium dye complexes adsorbed to TiO(2) by reductive electropolymerization. The goal was to create an efficient, water-stable photoelectrode or electrodes. An adsorbed-[Ru(vbpy)(2)(dcb)](PF(6))(2)/poly-[Ru(vbpy)…
The objective of this investigation is to understand the inception of ice surface corona streamers. A validated onset criterion that is useful for practical electrode geometries is presented. High-speed streak photography techniques were used to observe the streamers propagating over an ice surface. The effects of sev…
The optical properties of five metal phthalocyanines (MPcs) thin films (cobalt phthalocyanine (Pc), copper Pc, iron Pc (FePc), nickel Pc, and zinc Pc), were studied by spectroscopic ellipsometry. Thin films of these MPcs were evaporated in high vacuum onto glass substrates, quartz substrates, and silicon substrates. S…
The application of the Clar aromatic sextet valence bond (VB) model to extended, defect-free single-walled carbon nanotubes (CNTs) with roll-up vectors (m, n) provides a real space model of their electronic structure. If m - n = 3k, where k is an integer, then all pi-electrons can be represented by aromatic sextets, a…
The Ba(Zr x Ti 1− x )O 3 (BZT) thin films were prepared by deposition of relevant materials on LaNiO 3 -coated silicon substrates by the sol–gel process. The films thus prepared show a (100) preferred orientation in structure and vary with zirconium content. With the addition of Zr, the grain sizes of films were found…
Abstract The thermal conductivity at constant pressure of a collection of crosslinked, closed‐cell polyethylene foams were measured at room temperature with the transient plane source (TPS) method. The experimental results were compared with those determined by a standard steady‐state technique. The results showed tha…
Alternative bridging: Alternating ferro- and antiferromagnetic interactions are mediated by alternating end-on and end-to-end azido bridges, respectively, in a novel manganese azido complex. The compound has an interesting framework of threefold interpenetrating (10,3) nets, one of which is shown in the picture.
Resin molds for clusters: The nanoporous domains of a gel-type microporous functional resin are used as templates for the production of size-controlled Pd0 nanoclusters, the size of which is governed by the largest mesh available (see picture). Inverse steric exclusion chromatography provides the quantitative estimate…
A novel dendrimeric compound is designed with the objective of simultaneously addressing issues commonly encountered in drug delivery, i.e., stability in biological milieu as well as targeting. For this purpose, a multifunctional dendrimeric system derived from diaminobutane poly(propylene imine) dendrimers (DAB) is p…
Diffusivity is a key quantity in describing velocity fluctuations in granular materials. These fluctuations are the basis of many thermodynamic and hydrodynamic models which aim to provide a statistical description of granular systems. We present experimental results on diffusivity in dense, granular shear in a 2D Cou…
We present here new evidence that after a quench the planar Potts model on the square lattice relaxes towards a glassy state if the number of states q is larger than four. By extrapolating the finite size data we compute the average energy of these states for the infinite system with periodic boundary conditions, and…
The ZnO quantum dots (about 3 nm in average size) and the ZnO nanorods (about 80 nm in length and 14 nm in width) were synthesized by the sol−gel method. They were characterized by X-ray powder diffraction (XRD), transmission electron microscopy (TEM), UV−vis spectroscopy, and photoluminescence (PL) spectroscopy. The…
Hybrid materials based on covalently linked inorganic polyoxometalates (POMs) and organic species containing a delocalized pi system have drawn increasing attention. These hybrids, traditionally prepared by cluster assembly approaches that lack predictability and controllability, can now be synthesized through common…
Synthetic conditions such as temperature, stirring rate, ionic strength, acidity, and reactant ratios that affect the mesostructures and macrostructures of mesoporous materials have been extensively studied in the nonionic block copolymer templating system. Highly ordered SBA-15 materials with ∼100% rodlike morphologi…
Thermosensitive gold nanoparticles were fabricated by conjugating Au with a thiol-terminated poly(N-isopropylacrylamide) or PPA; this polymer stabilizer exhibits a temperature transition while undergoing a hydrophilic to hydrophobic transformation. The introduction of PPA onto gold nanoparticles has sensitized Au nano…
Abstract Both n‐type and p‐type ZnO will be required for development of homojunction light‐emitting diodes (LEDs) and laser diodes (LDs). It is easy to obtain strong n‐type ZnO, but very difficult to create consistent, reliable, high‐conductivity p‐type material. The most natural choice of an acceptor dopant is N, sub…