Materials Literature
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A novel cover layer material for flexible printed circuit (FPC) applications was developed in this work. A high molecular weight of polyimide composed of four monomers, pyromellitic dianhydride (PMDA), 3,3',4,4'-biphenyltetracarboxylic dianhydride (BPDA), 2,2'-bis(trifluoromethyl)benzidine (TFMB) and 2,2-bis(3-amino-4…
We revisit the standard elastic-plastic fracture theory developed by Hutchinson, Rice, and Rosengren (HRR) and reproduce, by a simple scaling argument, the stress singularity around the crack tip derived by HRR. From the singular behavior thus reconfirmed, we propose a general scaling relation which guarantees an effe…
Te-free Si x Sb 100 −x ( x = 5, 15, 25, 42) thin films are proposed for electronic phase-change memory application and the oxygen doping effect on Si 15 Sb 85 film is investigated in detail. Improved electrical properties are obtained when the oxygen partial pressure ratio is 10%. The crystalline resistivity of Si 15…
We studied the isotope effect of phonon in the Fe-based superconductors using a phenomenological two band model for the sign-changing $s$-wave ($\ifmmode\pm\else\textpm\fi{}s$-wave) state. Within this mean-field model, we showed that the large isotope effect is not inconsistent with the $\ifmmode\pm\else\textpm\fi{}s$…
In cardiovascular tissue engineering, mechanical stimulation of tissue-engineered constructs is known to improve tissue properties. During tissue culture, the mechanical properties of the tissue construct change. To impose a predefined deformation protocol and to avoid negative effects of excessive strain, it is desir…
A nondestructive Fourier transform infrared (FTIR) spectroscopy assay, amenable to exploring a wide range of proteins and polymers, is used to measure changes in the tertiary structure of bovine serum albumin (BSA) adsorbed to three surfaces: gold, polystyrene (PS), and poly(D,L-lactic acid) (PDLLA). Tertiary structur…
The coating of medical implants by polymeric films aims at increasing their biocompatibility as well as providing a durable matrix for the controlled release of a drug. In many cases, the coating is divided into a primer layer, which bridges between the medical implant and the drug-eluting matrix. The primer coating m…
To support the development of new materials for the design of next generation supersonic transports, a research program is underway at NASA to assess the long term durability of advanced polymer matrix composites (PMC's). One of main objectives of the program was to explore the effects of elevated temperature (23 to 2…
After decomposition of thiourea (TU) in the presence of various metal cations to form metal sulfide nanoclusters, an autocatalytic reaction between TU and the surface of the as-formed metal sulfide dominates the further growth of these metal sulfide nanoclusters. This autocatalytic surface growth is self-correcting, l…
Recently, Kolboe and Svelle pointed out that second-order Møller-Plesset perturbation theory (MP2) incorrectly predicts a barrierless reaction of the benzenium-ethene complex to the ethyl-1H-benzene cation in contrast to other considered quantum chemical methods [J. Phys. Chem. A 2008, 112, 6399]. In a subsequent Lett…
Dendritic polystyrene with hydroxyl functional groups at each branch point was synthesized using convergent living anionic polymerization. The polymer samples were formed by the slow addition of a 1/10 molar mixture of 4-vinylstyrene oxide/styrene to living polystyryllithium chains in a benzene/THF solution. The 4-vin…
We report measurements of the de Haas-van Alphen (dHvA) oscillation and a band structure calculation for the pnictide superconductor BaNi$_2$P$_2$, which is isostructural to BaFe$_2$As$_2$, the mother compound of the iron-pnictide high-$T_c$ superconductor (Ba$_{1-x}$K$_x$)Fe$_2$As$_2$. Six dHvA-frequency branches wit…
Single-walled carbon nanotubes (SWCNTs) sonicated in o -dichlorobenzene and benzyl chloride show anomalous behavior when characterized with a Raman microscope and ultraviolet−visible−near-infrared spectroscopy. SWCNTs treated with the aforementioned solvents lead to a small but distinct increase in the Raman D peak, w…
We report on the fabrication of very large-area organic single crystalline thin films on amorphous hydrophilic CN- and OH-modified substrates for electro-optic applications. The phenolic configurationally locked polyene (CLP) crystals having large macroscopic nonlinearity and an electro-optic coefficient of r 333 = 52…
The high-transition-temperature (high-Tc) superconductivity discovered recently in iron pnictides is analyzed within a perturbation theory. Specifically, the probable pairing symmetry, the doping dependence of the transition temperature and the pairing mechanism are studied by solving the Eliashberg equation for multi…
The adsorption of NO molecules on Pd(n) clusters of varying size (n=1-6) located in the main channel of mordenite and the interaction of the metallic clusters with the zeolitic framework were investigated using ab initio density-functional calculations under periodic boundary conditions. The supported clusters are cre…
The influence of the temperature during self-assembled growth of BiFeO 3 −CoFe 2 O 4 columnar nanocomposites on (001) and (111) oriented SrTiO 3 substrates has been investigated aiming to control pillar size and lateral ordering. The dramatic influence of the growth temperature on the nanoobject morphology is found to…
Abstract High‐speed, in situ video microscopy is a promising technology for measuring critical solid‐phase properties in suspension crystallization processes. This paper demonstrates the feasibility of high‐resolution, video‐imaging‐based particle size distribution (PSD) measurement by applying image analysis and stat…
Well-organized periodic mesoporous organosilica thin films (designated as PMO-SBA15), having covalently bonded perylene-bridged silesquioxane (PTCDBS) inside their pore channels, are successfully synthesized via sol-gel self-assembly of 1,2-bis(triethoxysilyl)ethane and perylene-bridged silsesquioxane, using micelles…
While optics is one of our oldest scientific tools, enabling some of the earliest advances in astronomy and biology, it is also currently one of the most dynamic and exciting areas of applied science. Developments of the past two decades in nanoscale device fabrication, nanomaterials synthesis and patterning, and adva…