Materials Literature
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Abstract The structural and magnetic properties of the double perovskite LaCaMnNbO 6 have been investigated using neutron powder diffraction and SQUID magnetometry. LaCaMnNbO 6 has a monoclinic P 2 1 / n superstructure ( a = 5.5929(1) Å, b = 5.7406(1) Å, c = 7.9824(1) Å and β = 89.897(1)°) with an almost fully ordered…
Novel assembled films of monolayer-protected clusters (MPCs) can be grown on gold and glass substrates with a 20-fold higher efficiency than established procedures. Thick MPC films grown using this new method, which can easily be scaled up or automated, are extremely stable and have properties identical to traditional…
Optical spectra of CdS nanocrystals are interpreted by using both the atomistic tight-binding method and multiband effective mass theory. Both methods correctly describe the energy splitting between the two lowest optically active transitions and their relative strengths, providing the same labeling of the two main ab…
Abstract The compounds In 5 Ch 5 X (Ch = S, Se; X = Cl, Br) represent new mixed valence solids with indium occurring simultaneously in three different oxidation states: In + , In 3+ and In 2+ where the latter appears as covalently bonded dumbbells (In 2 ) 4+ . Although the ionic formulation ( In 5 Ch 5 X = In + 2In 3+…
A sprinkle multiwall-carbon nanotubes, adding into the system of epoxy resin (EP), can bring the resin system to semiconducting state. Adding such kind of carbon nanotubes in the Ag/EP system which the content of conducting particle is below the threshold, can ameliorate its conducting capacity. 0.4wt.% of carbon nano…
A new type of volume holographic gratings based on polymer-liquid crystal composite named POLIPHEM (POlymer LIquid Crystal Polymer Holograms Electrically Manageable) is presented. The new composite material in combination with the proper holographic fabrication results in switchable holographic gratings with high diff…
Silica filled epoxy resins as encapsulation in chip packages reveal a major influence on the reliability and functionality of microelectronic devices. In this study, the resulting effects of postmold curing (PMC) on the thermomechanical and chemical properties of different mold compounds were observed. Polymer systems…
Adsorbed natural gas has various advantages and is relatively more economical than liquefaction and compression. In our present investigation, we have prepared the carbon monolith from a phenol resin mixed with a renewable resource (such as cotton fiber) after carbonization. The compositions were optimized to determin…
Abstract The two novel thioantimonates(III) (C 6 N 3 H 17 2+ )Sb 6 S 10 ( I ) and (C 7 N 2 H 13 + ) 3 Sb 9 S 15 ( II ) were synthesized under solvothermal conditions reacting Sb and S with the amines 1‐(2‐aminoethyl)‐piperazine (C 6 N 3 H 15 ) and 1, 5‐diazabicyclo[4.3.0.]non‐5‐en (DBN, C 7 N 2 H 12 ), respectively. T…
The growth kinetics of crystals of bis(imidazolium 2,6-dicarboxypyridine) M (II) dihydrate, where M = Cu, Ni, Co, Zn, and Mn, were studied in situ using atomic force microscopy. The aspect ratios of specific crystal facets were found to vary systematically with changes in the total concentration of the three component…
A detailed investigation of the reorganization processes occurring in the crystalline phase of poly(butylene terephthalate) (PBT) during fusion was performed by temperature-modulated differential scanning calorimetry (TMDSC). Quasi-isothermal TMDSC analyses were conducted for extended times at different temperatures i…
The structure of amorphous ice under pressure has been studied by molecular dynamics at 160 K. The starting low-density phase undergoes significant changes as the density increases, and at rho=1.51 g/cm(3) our calculated g(OO)(r) is in excellent agreement with in situ neutron diffraction data obtained at 1.8 GPa and 1…
This presentation is an overview of clean/strip processing for low Cu/low-k technology. The paper starts with a brief analysis of dry etch processes that determine the issues in subsequent processes; in the case of porous low-k dielectrics, etch conditions must be carefully optimized to find an optimal balance between…
An amorphous 50/50 atactic polypropylene (aPP)/isotactic polypropylene (iPP) mixture at 125 degrees C was simulated using a second nearest neighbor diamond lattice and a three states rotational isometric state model. The result suggests that at the liquidlike density that corresponds to the atmospheric pressure, aPP p…
ADVERTISEMENT RETURN TO ISSUEPREVNoteNEXTA Reexamination of and Me of Syndiotactic Polypropylenes with Metallocene CatalystsChenyang Liu, Jian Yu, Jiasong He, Wei Liu, Chunyan Sun, and Zhenhua JingView Author Information Key Laboratory of Engineering Plastics, Joint Laboratory of Polymer Science and Materials, Institu…
The one-dimensional paracrystal model is generalized by folding the lattice sites with objects whose scattering lengths or sizes and separation display a spatial correlation from cell to cell. A general theory to calculate the diffuse scattering and the scattering-length autocorrelation function is developed. The inve…
The miscibility and thermal degradation of blends of poly(bisphenol A carbonate) (PBC) with poly(vinyl chloride) (PVC) have been studied in inert atmosphere by a differential thermal/thermogravimetry analyzer. The blend showed a single glass transition temperature consistent with the Fox equation prediction suggesting…
Abstract Summary: Carbon nanotubes (CNTs) have been grown on MCM‐41 supported Fe nanoparticles and the as‐prepared (no further purification) CNT‐silica hybrid was directly incorporated into nylon‐6 (PA6) by simple melt‐compounding. The urchin‐shaped CNT‐silica hybrid filler was observed to be homogeneously dispersed t…
Abstract The reaction of bismuth and bismuth trichloride with sulfur or selenium, respectively, in a AlCl 3 /NaCl melt at 130 °C leads to (Bi 4 S 4 )[AlCl 4 ] 4 1 and (Bi 4 Se 4 )[AlCl 4 ] 4 2 in the form of red and amber colored crystals. Both crystallize isotypically in the tetragonal space group $I{\bar 4}$ with th…
Terminally protected acyclic tripeptides Boc-Tyr(1)-Val(2)-Tyr(3)-OMe 1 and Boc-Tyr(1)-Ile(2)-Tyr(3)-OMe 2 self-assemble into nanotubes in crystals through various noncovalent interactions with an average internal diameter of 5 A (0.5 nm), and the tubular ensemble is developed through the hydrogen-bonded side chains o…