Materials Literature
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We have performed a detailed investigation of the solution-phase properties of the electrostatic complex formed between the sulfonated azo dye congo red (CR) and the peptide acetyl-YAAAKAAAAKAAAAKA-amide (YAK123). In contrast to amyloid, this complex had good solubility. Aqueous solutions of mixtures of YAK123 and CR…
Lamellar mesostructured aluminophosphates were synthesized from aluminum triisopropoxide and phosphoric acid; monododecyl phosphate surfactant was used as structure-directing template. Depending on the relative Al/P ratio in the samples, variable relative amounts of tetrahedrally and octahedrally coordinated Al are fo…
Silica–alumina catalysts of varying acidity were used for polymerization of hexamethyl cyclotrisiloxane and octamethyl cyclotetrasiloxane monomers (cyclic trimer and tetramer, respectively). Acidic sites of silica–alumina are responsible for the polymerization and variation in the acidity of the catalyst were shown to…
Natural rubber (NR) was blended in various ratios with 29 kinds of tackifier resins, which were prepared from rosin, terpenes, and petroleum. Miscibilities of all the blend systems were illustrated as phase diagrams. From these blend systems, we selected 7 systems having typical phase diagrams [completely miscible, co…
Specimens of epoxy resin reinforced with ultrahigh-modulus polyethylene (UHMPE) fibers were immersed in water, and their swelling characteristics were recorded at various temperatures. In addition to an estimation of the response of those composite, the above study aimed at the exploration of the role of the fiber–mat…
Oxygen quenching of the luminescence of mononuclear and dinuclear Ir(III) cyclometalated complexes immobilized in the pPEGMA matrixes has been studied. Linear Stern-Volmer plots, even when experiments at different emission wavelengths have been performed, were evidenced. Despite the different luminescence lifetimes of…
We consider a three-dimensional liquid drop sitting on a rough and chemically heterogeneous substrate. Using a novel minimization technique on the free energy of this system, a generalized Young's equation for the contact angle is found. In certain limits, the Cassie and Wenzel laws, and a new equivalent rule, applica…
The complex refractive index of phase-change Ge<SUB>2</SUB>Sb<SUB>2+x</SUB>Te<SUB>5</SUB> media fabricated by DC magnetron sputtering has been determined by using spectroscopic ellipsometry and atomic force microscopy. The composition of Ge<SUB>2</SUB>Sb<SUB>2+x</SUB>Te<SUB>5</SUB> analyzed by Inductively Coupled Plas…
The complexity of biomineralized structures suggests the potential of organic constituents for controlling energetic factors during crystal synthesis. Atomic force microscopy was used to investigate the thermodynamic controls on carbonate growth and to measure the dependence of step speed on step length and the depend…
Site-directed mutagenesis was performed on the bifunctional enzyme chorismate mutase-prephenate dehydrogenase in order to identify groups important for each of the two reactions. We selected two residues for mutagenesis, Lys37 and His131, identified previously by differential peptide mapping to be essential for activi…
We report results of the Monte Carlo simulations of stable and metastable phases of cyanoadamantane crystal, which is a model of an orientational glass forming system. The structures which have been found stable within the Monte Carlo runs include the plastic cubic phase, two different monoclinic phases, and an orthor…
A solution-phase sodium hypochlorite (NaOCl) cathode for use in an aluminum-based seawater battery is presented. This catholyte attains a high power density, a positive redox potential, and a high Faradaic current capacity. NaOCl is also inexpensive, stable, and environmentally safe/friendly. Four aluminum alloys and…
We present a simple scaling theory to describe the conformational properties of semiflexible polymers grafted on a flat surface. For orientation-dependent interactions between polymer segments, we analyzed the physical properties of a polymer brush from the collapsed to strongly stretched regimes. Our analysis predict…
Organic and polymeric semiconductors are promising new materials for thin-film transistor devices. The supramolecular conductive pathways in one such material, α,ω-dihexyl-α-hexathiophene, have now been imaged with submolecular resolution. The dark regions in the transmission electron micrograph are spaced 3.6 nm apar…
Thin films of CdSe nanoparticles were chemically deposited on a glass substrate. The PL spectra of these films are dominated by a red-IR emission band, associated with the recombination of shallow trapped electrons and deep trapped holes. The optically detected magnetic resonance (ODMR) measurements revealed that the…
Off-lattice Monte Carlo simulations of the interphase between crystals for freely rotating chains are reported. Both conformational and topological spaces are sampled during a single simulation. The transition region between the crystal and the amorphous phase is characterized in terms of density, bond orientation ord…
The mechanisms for the hydrolysis of SiHCl 3 to form HSi(OH) 3 and the condensations of SiH 3 OH and HSi(OH) 3 are studied by using ab initio electronic structure methods including electron correlation via second and fourth order perturbation theory and coupled cluster calculations. In the gas phase, the barrier heigh…
Macroscopic first-, second-, and third-order susceptibilities of the urea crystal are calculated using static and frequency-dependent ab initio molecular (hyper)polarizabilities at the self-consistent field (SCF) and second-order-Mo/ller–Plesset (MP2) levels. Environmental effects are taken into account using a rigoro…
Calcium carbonate crystal growth on a chitosan substrate was achieved using a supersaturated calcium carbonate solution. Heterogeneous nucleation of the calcium carbonate crystals was significantly influenced by the chitosan surface profile. Poly(acrylic acid) (MW = 2000, PAA2K) was chosen to modify chitosan surfaces…
The x-ray excited optical luminescence (XEOL) from a variety of rare-earth ions was used as a detection mode for the collection of L-edge x-ray absorption fine-structure (XAFS) data. In order to understand the source of the observed optical signal, advantage is taken of the known luminescent response of f ions in a va…