Materials Literature
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We synthesized a series of well-defined rod−coil block copolymers (BCPs), poly(dimethylsiloxane)- b -poly{2,5-bis[(4-methoxyphenyl)oxycarbonyl]styrene} (PDMS- b -PMPCS), containing a CO 2 -philic block PDMS, and we studied their phase structures in bulk and after treatment with supercritical CO 2 (scCO 2 ) using small…
Shape memory polymers (SMPs) are a group of adaptive polymers that can recover the permanent shape from a temporary shape by external stimuli on demand. Among a variety of external stimuli for polymer actuation, temperature is the most extensively used. In SMP applications, one of the major design considerations is th…
Abstract A 20 V stack of 19 supercapacitors was fabricated from titanium bipolar plates (150 × 150 × 0.1 mm 3 ) coated on each side with carbon nanotubes and polypyrrole composite (+) and pigment carbon black (−), and microporous polymeric separators containing aqueous KCl. Internal sealing of each cell in the stack w…
Oriented domains of the chiral/polar crystalline helical nanofilaments of the bent-core liquid crystal B4 phase are reported. A combination of topographic confinement of the bent-core molecule in micrometer-scale rectangular channels etched into a silicon surface with cooling from the isotropic melt in the presence of…
Oxynitride‐based phosphors CaSi 2 O 2 N 2 codoped with Ce 3+ and Eu 2+ were prepared in this study. Broad Ce 3+ excitation spectra ranging from 200 to 500 nm were found for CaSi 2 O 2 N 2 :Ce 3+ , Eu 2+ phosphors. The emission bands consisted of Ce 3+ and Eu 2+ emission peaks. When the Eu 2+ concentration increased, t…
Abstract A series of novel polyimides based on N,N ‐di(4‐aminophenyl)‐1‐aminopyrene and aromatic or alicyclic tetracarboxylic dianhydrides were synthesized. The polymers exhibited good solubility in many polar organic solvents and could afford robust films via solution casting. The polyimides derived from aromatic dia…
For the first time, α‐calcium sulfate hemihydrate (α‐HH) was successfully prepared from calcium sulfate dihydrate (DH) in methanol–water solution under atmospheric pressure. The effect of methanol concentrations (40–73 mol%) on the transition from DH to α‐HH were investigated at temperatures (60°–75°C) within a reacti…
The growth mechanism and influence of synthesis parameters on the properties of single-walled carbon nanotubes (SWNTs) produced by ferrocene vapor decomposition in a carbon monoxide atmosphere have been investigated in detail by a combined study of Raman and UV−vis−NIR absorption spectroscopy and transmission electron…
We report on the specific-heat determination of the anisotropic phase diagram of single crystals of optimally doped SmFeAsO${}_{1\ensuremath{-}x}$F${}_{x}$. In zero field, we find a clear cusplike anomaly in $C$/$T$ with $\ensuremath{\Delta}C/{T}_{c}=24$ mJ/mol ${\mathrm{K}}^{2}$ at ${T}_{c}=49.5$ K. In magnetic field…
A method for synthesizing layered zinc hydroxide compounds in high yields is developed using an immiscible liquid-liquid system in one pot. Long-chain carboxylate ions such as heptanoate, decanoate, and dodecanoate were successfully intercalated between zinc hydroxide layers in one process starting from a xylene-water…
Abstract The aggregation of crystals within a flow tube was observed based on data extracted from images of the bypassing population. The experiments were conducted under different conditions, namely the flow rate and the particle concentration have been varied simultaneously and two different solvents were used in wh…
Sintered reaction‐bonded silicon nitrides (SRBSNs) were fabricated from commercially available low‐grade Si powder containing 1.6 mass% of impurity oxygen and 500 ppm of metallic impurities. Powder compacts of the raw Si powder doped with Y 2 O 3 and MgO/MgSiN 2 as sintering additives were nitrided at 1400°C for 8 h u…
Flame-retardant ethylene vinyl acetate copolymer (EVA) by silica gel-microencapsulated ammonium polyphosphate (MCAPP) and char-forming agent (CFA) have been cross linked by electron beam irradiation. The effects of electron beam irradiation on the electrical, thermal, mechanical, and flame-retardant properties of irra…
For modern processing of ceramics at the nanoscale, the influence of interparticle interactions in the suspended state becomes increasingly important. The Hamaker 2 program has been developed for the rapid prediction of these interactions, allowing us to gain important understanding of the often delicate balance of fo…
Abstract The interaction of 4‐amino‐4H,3,5‐di(methoxy)‐1,2,4‐triazole (ATD), (4‐(benzylideneamino)‐4H‐1,2,4‐triazole‐3,5‐diyl) dimethanol (BATD), and (4‐(4‐(dimethylamino) benzylideneamino))‐4H‐1,2,4‐triazole‐3,5‐diyl) dimethanol (DBATD) on copper in 1 N sulfuric acid was investigated by potentiodynamic polarization (…
Abstract Background The effect of the B cation on the surface properties and catalytic activity in the total combustion of toluene over La 1−x Ca x BO 3 (B = Fe,Ni) perovskite‐type oxides was studied. Result For the La 1−x Ca x FeO 3 series, the perovskite structure was maintained in the range of substitution studied.…
A scalable processing method was used to fabricate graphite fiber composites with single-walled carbon nanotubes (SWCNTs) and the microstructures and properties of the fabricated laminates were investigated. SWCNTs were sprayed onto the surface of graphite/epoxy prepreg using an air spray. Interlaminar shear strength…
BACKGROUND: Polycyclic aromatic hydrocarbons (PAHs) are environmental pollutants ubiquitously distributed. They are generated by incomplete combustion of organic materials such as wood or fossil fuels. Due to their carcinogenic, mutagenic effects and to their wide distribution in the environment, these pollutants pose…
ADVERTISEMENT RETURN TO ISSUEPREVReviewNEXTConnecting the Chemical and Physical Viewpoints of What Determines Structure: From 1-D Chains to γ-BrassesRobert F. Berger†‡, Peter L. Walters†§, Stephen Lee*†, and Roald Hoffmann*†View Author Information† Department of Chemistry and Chemical Biology, Cornell University, Itha…
In this research work, magnetic multi-walled carbon nanotube (MWCNTs) nanocomposites have been created by the assembly of Mn-Co-Ti-substituted barium ferrite nanoparticles onto the surface of MWCNTs. X-ray diffraction (XRD) and transmission electron microscopy (TEM) were used to demonstrate the successful attachment o…