Materials Literature
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ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTHigh-Resolution X-ray Diffraction and ab Initio Quantum Chemical Studies of Glycoluril, a Biotin AnalogNaiyin Li, Sergio Maluendes, Robert H. Blessing, Michel Dupuis, Grant R. Moss, and George T. DeTittaCite this: J. Am. Chem. Soc. 1994, 116, 15, 6494–6507Publication Date (P…
Abstract This paper deals with protein microencapsulation by coacervation of poly(lactide‐co‐glycolide) solutions in CH 2 Cl 2 induced by the addition of silicone oils of various viscosities. This coating technique proceeds along three steps: phase separation of the coating polyester, adsorption of the coacervate drop…
Abstract X‐ray photoelectron spectroscopy was used to investigate how different pretreatments modify the chemical composition and bonding on silicon substrate surface and, to detect the intermediate phases present at the diamond film interface. The pretreatments were mechanical scratching with a diamond powder, ultras…
Surface observation was carried out for diamond homoepitaxial films grown on (001) substrates. Nonepitaxial crystallites and growth hillocks were observed on the films. The majority of the nonepitaxial crystallites were found to be {111} penetration twins, which were considered to originate from the twin nucleation on…
Abstract This paper reports some XPS data on unexposed and exposed thin films of As 2 S 3 deposited onto chromium‐coated glass substrates. We show the chemical changes on the surface and interface of As 2 S 3 and chromium layers. The chromium layers are obtained by thermal evaporation, high‐frequency sputtering and el…
cathodes have been investigated as high temperature oxygen reduction electrodes in the solid oxide fuel cells (SOFCs). The cathodes consist of 10 mole percent of yttria stabilized zirconia (YSZ) thin film electrolyte layer deposited on a porous tube using the electrochemical vapor deposition method. The cathodes have…
Abstract Transesterification of polycarbonate/poly(ethylene‐terephthalate) (PC/PET) blends and the reaction extent were investigated by DSC, FTIR, 1 H NMR and Soxhlet extraction. A new characteristic peak appeared in the FTIR spectrum of PC/PET blends after heat treatment, which indicates that new copolymers were form…
We review recent results on the mechanisms of atomic mixing, radiation-induced disordering, and defect production and clustering induced by displacement cascades in Cu, Ag, Cu3Au and Ni3Al. We employ molecular dynamics computer simulation (MD) methods with isotropic many body potentials and recoil energies near the su…
The role of Ga2O in the removal of GaAs surface oxides induced by atomic hydrogen (H⋅) has been studied using temperature-programed desorption (TPD), x-ray photoelectron spectroscopy, and low-energy electron diffraction (LEED). GaAs(001) substrates with ‘‘Ga2O3-like’’ surface oxides formed in vacuo, as well as those ‘…
Two models of icosahedral quasicrystals are compared and connected. These are canonical-cell ordering (CCO) over medium-length scales (about 10 Å and more) and dodecahedral local ordering (DLO), which describes interatomic arrangements. In the DLO model, each atom is surrounded by closest neighbours positioned at seve…
A theoretical treatment is given of the problem of transmission of light through a slab of cholesteric liquid crystal. The axially symmetric arrangement is considered in which the faces of the crystal are perpendicular to the axis and the light propagation is parallel to the axis. The linear problem, as governed by Ma…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTCrystal Structure of Form III and the Polymorphism of Isotactic Poly(4-methylpentene-1)Claudio De Rosa, Anna Borriello, Vincenzo Venditto, and Paolo CorradiniCite this: Macromolecules 1994, 27, 14, 3864–3868Publication Date (Print):July 1, 1994Publication History Published o…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTCross-Linked Polymer Brushes. 1. Synthesis of Poly[.beta.-(vinyloxy)ethyl cinnamate]-b-poly(isobutyl vinyl ether)Guojun Liu, Nanxing Hu, Xiuqi Xu, and Hong YaoCite this: Macromolecules 1994, 27, 14, 3892–3895Publication Date (Print):July 1, 1994Publication History Published…
Ba 1–x Ca x TiO 3 powders have been prepared using a novel route involving solid‐state reaction in a mixture of Ba 1–x Ca x CO 3 and TiO 2 . The Ba 1–x Ca x CO 3 precursors used in this method were prepared by a chemical coprecipitation route to ensure a uniform supply of Ba and Ca ions during thermochemical reaction…
Abstract— Fatigue crack initiation and propagation in duplex stainless steels are strongly affected by microstructure in both inert and aggressive environments. Fatigue crack growth rates in wrought Zeron 100 duplex stainless steel in air were found to vary with orientation depending on the frequency of crack tip reta…
The use of a planar radio frequency inductively coupled plasma for the preparation of diamondlike carbon (DLC) thin films is investigated. This approach offers a number of advantages over conventional rf parallel plate plasma processes for studying the deposition of DLC. In the latter case, substrate ion bombardment e…
Abstract Molecular packing and electrical conductivity were studied in complexes of alkali trifluoromethanesulphonates with low‐molar or polymeric compounds containing both taper‐shaped mesogens were esters of either 3,4,5‐tris [ p ‐( n ‐dodecan‐l‐yloxy) benzyloxy] benzoic acid (I) or 3, 4, 5‐tris ( n ‐dodecan‐l‐yloxy…
We study the role of bulk-surface exchange in the density relaxation kinetics and selfdiffusion of surface-active molecules at liquid surfaces. In “ strongly adsorbing ” systems, relaxation occurs through bulk-mediated effective surface diffusion characterized by one-step distributions with long tails ; molecules exec…
The subloops in the shape memory alloys, the stress-strain-temperature hysteresis loops due to the incomplete transformation, are analyzed from the phenomenological point of view. The transformation kinetics formulated by the same authors is generalized by introducing the transformation start conditions, both martensi…
A computer-controlled apparatus able to simultaneously follow the face growth rate of up to 40 crystals was developed. This apparatus was used to investigate the effects of solution pH on the (110) and (101) face growth rates of tetragonal lysozyme. Growth rates were measured at pH 4.0, 4.4, 4.8 and 5.2, in 0.1 M sodi…