Materials Literature
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In this study, the model presented in Part I is used to investigate phenomena related to the compression of fiber assemblies that are not accounted for by van Wyk's theory of the uniaxial compression of an initially random fiber assembly. In order to do this, the potential energy, the work done on the assembly, and a…
The dielectric permittivity and ac conductivity of bis-(Methyltriphenyl-phosphonium) 2 tetraiodomercurate (II), [(CH 3 )(C 6 H 5 ) 3 P] 2 HgI 4 , has been measured in at 300-400 K and 0.11-20 kHz. The frequency dependent conductivity is interpreted in terms of the jump relaxation model, where translational and reorien…
Cadmium mercury thiocyanate (CdHg(SCN)4, CMTC) and its two lewis base adducts: cadmium mercury thiocyanate dimethyl-sulphoxide (CdHg(SCN)4(H6C2OS)2, CMTD) and cadmium mercury thiocyanate glycol monomethyl ether (CdHg(SCN)4(C3H8O2), CMTG) have been discovered as nonlinear optical (NLO) crystal materials. Their structur…
Abstract The change in Mooney viscosity ( ML 1+4 ) with aging was followed for silica filled compounds containing various silanes and polar additives. Several mechanisms for the aging stability are postulated and evaluated through experimentation. The type of silane or polar additive used can cause the ML 1+4 to incre…
Blazed diffractive optical elements (DOEs) were studied for the violet wavelength by electron-beam lithography. By optimizing electron-beam writing parameters and electron-dose distributions, we fabricated eight kinds of grating (period A = 10-0.54 microgm) with excellent blazed structure. It has been demonstrated tha…
We investigated the effects of the sintering atmosphere on the interface structure and grain‐growth behavior in 10‐vol%‐YAG‐added SiC. When α‐SiC was liquid‐phase‐sintered in an Ar atmosphere, the grain/matrix interface was faceted, and abnormal grain growth occurred, regardless of the presence of α‐seed grains. In co…
Transforming growth factor-beta1 is a fibrogenic cytokine that is important in the development of fibroproliferative disorders of the skin after injury. To investigate the role of transforming growth factor-beta1 produced by keratinocytes during wound healing, a plasmid with the human transforming growth factor-beta1…
Methyltrioxorhenium(VII) (MTO) has been immobilized in the mesoporous silica MCM-41 functionalized with pendant bipyridyl (bpy) groups of the type 4-[(−O)3Si(CH2)4]-4′-CH3-2,2′-bipyridine. Powder X-ray diffraction and N2 adsorption-desorption studies confirm that the regular hexagonal symmetry of the host is retained…
Detector-grade undoped chemical vapor deposited (CVD) diamond samples have been studied with thermally stimulated currents (TSC) and photoinduced current transient spectroscopy (PICTS) analyses in the temperature range 300–650 K. Two previously unknown defects have been identified, characterized by activation energies…
To approach a microscopic understanding of the reaction kinetics on complex surfaces of heterogeneous catalysts, we combine multimolecular beam techniques and a supported model catalyst approach. The model systems are prepared under ultrahigh vacuum (UHV) conditions and have been characterized in detail with respect t…
The complex {Fe[HC(3,5-Me2pz)3]2}I2 (1) has been prepared from the reaction of FeI2 and HC(3,5-Me2pz)3 (pz = pyrazolyl ring) in a 1:2 ratio. The complex is high-spin in both the solid state and in solution at ambient temperature. In the solid state, magnetic susceptibility and Mössbauer spectral studies indicate that…
Abstract Hybrid composites consisting of isotactic poly(propylene) (PP), sisal fiber (SF), and maleic anhydride grafted styrene‐(ethylene‐ co ‐butylene)‐styrene copolymer (MA‐SEBS) were prepared by melt compounding, followed by injection molding. The melt‐compounding torque behavior, thermal properties, morphology, cr…
Porous silicon is a material of intense technological and fundamental interest, due to its high surface area, quantum confinement effects, light emission, and complex nanoscale architecture. There is a strong desire to be able to control the surface properties of this versatile material at will through functionalizati…
We previously reported on the successful creation of tissue-engineered valve leaflets and the implantation of these autologous tissue leaflets in the pulmonary valve position. Mixed cell populations of endothelial cells and fibroblasts were isolated from explanted ovine arteries. Endothelial cells were selectively lab…
We study the grating-assisted light-emitting diode, an LED design for high brightness based on a resonant cavity containing one- or two-dimensionally periodically corrugated layers (grating). We give in detail a generally applicable electromagnetic analysis based on the rigorous coupled-wave theory to calculate the ex…
Sodium niobate powders were prepared by the amorphous complex method using a water-soluble Nb−malic acid complex and sodium carbonate. Niobium oxide pentahydrate was dissolved in hot oxalic acid solution, followed by the addition of NH 3 (30%) until pH = 11, precipitating niobic acid that was added into a solution of…
Inorganic nanotubes of WS2 have been investigated by high-resolution transmission electron microscopy, and scanning tunneling microscopy, providing support for the theoretical prediction of correlation of bandgap with diameter.
Alfalfa ( Medicago sativa L.) is primarily used as a source of forage and animal feed. Improving the economic value of alfalfa could be achieved by developing new uses of this perennial crop. To investigate the potential of alfalfa as a source of industrial materials, we employed a genetic transformation approach to p…
Effect of Focal Plane Array Cold Shield Aperture Size on Fourier Transform Infrared Micro-Imaging Spectrometer Performance
Poly(styrene sulfonate) and poly(allylamine hydrochloride) layers have been adsorbed supplementarily on polyelectrolyte capsules. The permeability of the original capsules consisting of four layer pairs was of the order of 10–5 m/s for fluorescein. They were also permeable for macromolecules. Polyelectrolyte layers ad…