Materials Literature
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Similarly, the National Institutes of Health consensus development conference of 1982 defined a biomaterial as “any substance other than a drug, or combination of substances, synthetic or natural in origin which can be used for any period of time as a whole or as a part of the system that treats, augments, or replaces…
Abstract Copper foils have been widely used in microelectronic devices. Adequate adhesion between copper foils to various substrates, such as Si, SiO 2 , polyimide, is crucial to high performance of these devices. The adhesion between a new high temperature adhesive, aromatic thermosetting copolyester (ATSP), and vari…
Abstract A star‐shape styrene–butadiene–styrene triblock copolymer SBS (802) was synthesized and fractionated into four fractions coded as 802‐F1 (four arms), 802‐F2 (two arms), 802‐F3 (one arm), and 802‐F4 by repeating fractional precipitation. Their weight‐average molecular weight ( M w ) was measured by size‐exclus…
Ab initio plane-wave pseudopotential density functional theory (DFT) calculations have been carried out to determine the atomic and electronic structure of the $\mathrm{K}∕\mathrm{Si}(111)\sqrt{3}\ifmmode\times\else\texttimes\fi{}\sqrt{3}R{30}^{\mathrm{\ifmmode^\circ\else\textdegree\fi{}}}\text{\ensuremath{-}}B$ adsor…
Abstract A negative type photosensitive polyimide with alicyclic moiety (NPI) was synthesized from 5‐(2,5‐dioxotetrahydrofuryl)‐3‐methyl‐3‐cyclohexene‐1,2‐dicarboxylic anhydride and 4,4‐diaminobenzophenone by one‐step polymerization in m ‐cresol. Properties of the polyimides were characterized and a photo‐crosslinking…
Abstract Recently, we demonstrated the possibility of synthesizing ordered nanowires of diluted magnetic II/VI semiconductors inside the channels of mesoporous silica host structures. Here, we expand this procedure from mesoporous powders to mesoporous thin films. Diluted magnetic semiconductors Cd 1– x Mn x S were sy…
Eine starke blaue Emission zeichnet hybride Cer(III)/Cer(IV)-phosphat-Nanoröhren aus, wohingegen Cer(III)-phosphat-Nanodrähte eine charakteristische zweigipflige UV-Lumineszenz zeigen (siehe Diagramm). Die Cerphosphatsysteme wurden durch Erhitzen neuartiger Cer(IV)-phosphat-Nanoröhren auf unterschiedliche Temperaturen…
SUMMARY Perlite is a glassy volcanic rock, which will, upon rapid controlled heating, expand into a frothy material of bulk density. Considering the fact that the uses of perlite are based primarily upon its physical and chemical properties, it is aimed to investigate some physical and chemical properties of unexpande…
Abstract In a fracture experiment of polymers, the total fracture work usually consists of an essential part associated with the plastic deformation at the crack tip and a nonessential part related to the viscous relaxation in the background. In this article, the essential fracture work in nylon 6‐silicate nanocomposi…
A modified forced silking procedure was developed to allow an accurate study of the tensile properties of spider (Argiope trifasciata) silk, especially the characterization of the variability of the tensile properties of forcibly silked fibers. The procedure involves an immobilization technique that does not require a…
We propose a diagram showing the sequence of Stark-split energy levels for the 4 I 15/2 and 4 I 13/2 states of Er 3+ doped into oxyfluoride, nano-scaled glass-ceramics based on low- and room temperature measurements of respective emission and absorption bands. The room temperature broadest and flattest 1.55 μm telecom…
Europium doped yttrium vanadate (<TEX>$YVO_4$</TEX>:Eu) phosphor thin films were grown using a pulsed laser deposition (PLD) technique on silicon substrate. The structural characterization carried out on a series of (<TEX>$YVO_4$</TEX>:Eu films at post annealing temperature in the range of 550 <TEX>$^{\circ}C$</TEX>-1…
Abstract A new negative‐working and alkaline‐developable photosensitive polyimide precursor based on poly(amic acid) (PAA), 4,4′‐methylenebis[2,6‐bis(hydroxymethyl)]phenol (MBHP) as a crosslinker, and a photoacid generator (5‐propylsulfonyloxyimino‐5 H ‐thiophen‐2‐ylidene)‐2‐(methylphenyl)acetonitrile (PTMA) has been…
The hygroscopic properties of the borate crystals $\mathrm{Li}{\mathrm{B}}_{3}{\mathrm{O}}_{5}$, $\mathrm{Cs}{\mathrm{B}}_{3}{\mathrm{O}}_{5}$, and $\mathrm{Cs}\mathrm{Li}{\mathrm{B}}_{6}{\mathrm{O}}_{10}$ are studied by density-functional theory. It is found that the absorption energy and the diffusion mechanism of w…
Abstract In the presence of acrylic acid (AA) as a primary dopant, polyaniline (PANI) doped with poly(acrylic acid) was successfully synthesized by using ammonium persulfate (APS) as initiator and oxidizing agent. The effect of experimental conditions on the polymer yields was systematically studied. It was found that…
We have investigated plasma surface interactions of nanoporous silica (NPS) films with porosities up to 50%, and SiO2 with C4F8∕Ar discharges used for plasma etching. The pore size was about 2–3nm for all films. In highly polymerizing plasmas (e.g., pure C4F8 discharges), the porous structure of NPS material favors su…
To make an implantable bioartificial liver (IBL), a new biocompatible collagen/chitosan/heparin complex was prepared using a crosslinking agent. The X-ray photoelectron spectroscopy (XPS), mechanical strength and biocompatibility with whole blood and hepatocytes were measured. The collagen/chitosan/heparin complex res…
A biphenyl-pillared layered hybrid material having microporosity with a specific surface area of 616 m2 g−1 has been synthesized by the anisotropic condensation of 4,4′-bis(triethoxysilyl)biphenyl (BESB) into the layered silicic acid of ilerite.
Abstract Natural rubber/polystyrene (NR/PS) blend films with weight ratios of 70/30, 60/40, and 50/50 were prepared using polystyrene grafted natural rubber copolymers (NR‐ g ‐PS) as the compatibilizer. Copolymers with molar ratios of 90/10, 80/20, and 70/30 were synthesized via emulsion copolymerization using tert ‐b…
trans-Dihydroxo[5,10,15,20-tetrakis(n-pyridyl)porphyrinato]tin(IV) (n = 3 and 4) complexes have been synthesized and fully characterized. X-ray structural analysis of trans-dihydroxo[5,10,15,20-tetrakis(4-pyridyl)porphyrinato]tin(IV) reveals that the supramolecular hydrogen bondings between the hydroxotin(IV) porphyri…