Materials Literature
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Abstract A novel positive‐working and aqueous‐base‐developable photosensitive poly(imide benzoxazole) precursor based on a poly(amic acid hydroxyamide) bearing phenolic hydroxyl groups and carboxylic acid groups, a diazonaphthoquinone (DNQ) photosensitive compound, and a solvent was developed. Poly(amic acid hydroxyam…
The structure, bonding, vibrational, and electronic properties of small clusters of gallium oxide, Ga m O n ( m, n = 1, 2) are studied here with a focus on the changes induced by the addition or removal of an electron from the neutral species. It is found that the addition of an electron introduces relatively larger s…
In this work, we have shown for the first time that assemblies of up to 64 alternating foam and film layers can be successfully made via the microlayer coextrusion technology. We have investigated the effect of some important processing variables on the foam-film structure, and have demonstrated how they can be optimi…
The influence of Sn doping upon the phase change characteristics of Ge2Sb2Te5 alloys has been investigated using four-point-probe electrical resistance measurements, grazing incidence X-ray diffraction (XRD), X-ray reflectometry (XRR) and variable incident angle spectroscopic ellipsometry (VASE), a static tester and a…
Polycarbonate microfoams produced by physical blowing agents usually have an unacceptable surface quality. The surface is rough and the visual difference in the surface quality is striking. However, the surface quality can be improved by the gas counterpressure technology. Polycarbonate has a high elongation at break…
Eight new chiral, chromophore-functionalized donor-embedded polybinaphthalenes were prepared and characterized for their (nonlinear) optical properties. The polymers were prepared by direct polymerization using a Stille coupling reaction between a chiral bis(trimethyltin) binaphthalene derivative and diiodo-functional…
This work was to study the activation regeneration of spent diatomaceous earth (SDE) for the preparation of mesoporous silica adsorbents by using alkaline activation method. Under the experimental conditions investigated, it was found that the alkaline activation method by sodium hydroxide under the controlled conditi…
In this paper, a procedure is described for the electroless deposition of silver on films containing 99.5% aluminum and 0.5% copper. The deposition proceeds in the absence of external reducing agents via the galvanic displacement mechanism by which silver cations are reduced and copper is oxidized. Although aluminum i…
This study investigates the effect of paper sludge’s mixing ratio and the types and concentrations of coupling agents on the physical and mechanical properties of paper sludge-thermoplastic polymer composites. In the experiment, four levels of mixing ratios of paper sludge to thermoplastic polymer (10: 90, 20: 80, 30:…
A ferrite left-handed transmission line has been proposed and investigated for the first time, which is composed of a ferrite microstrip line loaded periodically with capacitances and inductances. The nonreciprocal transmission characteristics with the isolation of greater than 20 dB are numerically obtained by finite…
The mechanism and controlling factors of polymorphic crystallization were investigated using amino acids and a thiazole derivative (BPT) (pharmaceutical). The controlling factors depend on the system and crystallization method. In the cooling crystallization of amino acids, supersaturation hardly influenced the crysta…
Abstract An aluminum/Schiff base complex {[2,2‐dimethyl‐1,3‐propylenebis(3,5‐di‐ tert ‐butylsalicylideneiminato)](isopropanolato)aluminum(III) ( 2 )} based on a bulky ligand and aluminum isopropoxide was prepared and employed for the stereoselective ring‐opening polymerization (ROP) of rac ‐lactide ( rac ‐LA). The ini…
The author offers a counter argument for the use of the term pseudopolymorphism. He argues that the term polymorph should ideally be restricted to crystals of a single compound. However, he notes that in multicomponent crystals there are too many structural variations and the term polymorphism is unnecessarily restric…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTConducting Organic Radical Cation Salts with Organic and Organometallic AnionsUrs Geiser and John A. SchlueterView Author Information Materials Science Division, Argonne National Laboratory, 9700 South Cass Avenue Building 200, Argonne, Illinois 60439 Cite this: Chem. Rev. 2…
We report a novel approach for growing aligned and orientation-ordered ZnS nanowires. Our method relies on a buffer layer of CdSe grown on a Si(111) substrate, on which ZnS nanowires are grown. The growth process of the nanowire bundles is presented. The technique demonstrated could be an effective pathway for growing…
A new POSS (polyhedral oligomeric silsesquioxane)-substituted polyfluorene was synthesized from the nickel-catalyzed Yamamoto coupling reaction. The synthesized polymers could be well characterized by 1 H NMR, FT-IR, and elemental analysis. PL spectra of PFPOSSs on the quartz film showed reduced aggregation/excimer fo…
Raman microscopy has been applied to study the preparation of shaped Mo/Al(2)O(3) catalysts. The speciation of different Mo complexes over gamma-Al(2)O(3) support bodies was followed in time after pore volume impregnation with aqueous solutions containing different Mo complexes. The addition of NO(3-) to the impregnat…
This article is a tutorial on Markov chain Monte Carlo simulations and their statistical analysis. The theoretical concepts are illustrated through many numerical assignments from the author's book on the subject. Computer code (in Fortran) is available for all subjects covered and can be downloaded from the web.
We investigate the effects of carbon and boron doping on the thermal expansion in the hexagonal (P63/mmc) intermetallic YbGaGe. X-ray powder diffraction was used to measure the lattice constants on pure and doped (C or B at nominal levels of 0.5 %) samples from T~10 K to T~300 K. Also measured were resistivity, specif…
Magnetic semiconductors have attracted interest because of the question of how a magnetic metal can be derived from a paramagnetic insulator. Here our approach is to carrier dope insulating FeSi and we show that the magnetic half-metal which emerges has unprecedented optical properties, unlike those of other low carri…