Materials Literature
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Abstract The structure of Tb 2 Ti 2 O 7 pyrochlore was investigated at high pressures up to 24 GPa at cryogenic temperatures down to 6.5 K using angular dispersive X‐ray diffraction with synchrotron radiation at HPCAT, Advanced Photon Source. The cell parameters were obtained by performing full profile Rietveld refine…
Abstract Zinc butyl xanthate [Zn(bxt) 2 ] was prepared in the laboratory. The effect of this xanthate with zinc diethyl dithiocarbamate (ZDC) on the vulcanization of natural rubber (NR), polybutadiene rubber (BR), and NR/BR blend has been studied at different temperatures. The amounts of Zn (bxt) 2 and ZDC in the comp…
Abstract A family of supramolecular polymers was prepared via Cd 2+ ‐directed self‐assembly polymerization of bis(2,2′:6′,2″‐terpyridine)‐based ligand monomers, using oligofluorenes and triphenylamine as bridges under mild conditions. The polymers were fully characterized using thermogravimetric analysis, inherent vis…
Abstract Mesoporous thin films are prepared using a simple sol–gel technique. Using lithographically patterned (100)‐orientated substrates and a dip‐coating method reproducible alignment of the pores across the substrate surface can be obtained. The pores preferentially align parallel to the long side of the channels…
Alles in Ordnung! Mesoporöses Kupferoxid wurde erstmals durch eine doppelte Replikation aus dem geordneten mesoporösen Siliciumoxid SBA-15 über ein geordnetes mesoporöses Kohlenstoff-CMK-3-Intermediat synthetisiert (siehe Bild). Dieses Material könnte interessante Eigenschaften in der Katalyse oder in Lithiumionenbatt…
Four novel fluorescent diarylethenes have been designed and synthesized. They showed excellent ring-opening and ring-closing photoisomerization properties with UV/Vis irradiation. It is found that both the ring-open and the ring-closed isomers have similar fluorescence emission, which is different from the known fluor…
Effects of octanoic acid (OA) on the morphology, diffraction efficiency, and electro-optic properties of the transmission mode of holographic polymer-dispersed liquid crystals (HPDLC) are studied. Droplet size decreases with increasing OA content (0-9 %), and this leads to a monotonic increase in off-state diffraction…
We report the spectroscopic observation of bound excitons in natural ${\mathrm{Cu}}_{2}\mathrm{O}$ samples, which are generated by impurity capture of free excitons. Due to the broken symmetry of a bound exciton, its radiative recombination rate increases, causing a greatly enhanced luminescence intensity compared wit…
Diffuse reflectance (visible) and attenuated total internal reflection Fourier-transform infrared (ATR-FTIR) spectroscopies were used to examine a colloidal nontronite clay in the presence of Fe2+(aq). pH-dependent changes are observed in both types of spectra. In the visible region, a broad feature at approximately 7…
Abstract Melt rheology and processability of exfoliated polypropylene (PP)/layered silicate nanocomposites were investigated. The nanocomposites were prepared by melt compounding process in the presence or absence of a PP‐based maleic anhydride compatibilizer. PP/layered silicate nanocomposites showed typical rheologi…
Morphosynthesis of calcium-rich materials by tuning the chemical structure of organic matrices has tremendous potential in the preparation of functional mineralized materials. In this paper, we have demonstrated the deposition of thin films of CaCO 3 by subtle modifications of the backbone of poly(methyl methacrylate)…
Crystallization of the metastable polymorph of paracetamol has been shown to occur around the edge of an evaporating aqueous solution. Conditions at the edge of a meniscus during evaporation led to an increase in solution concentration that allowed the nucleation of metastable crystals. This form was then unable to tr…
Abstract The antibacterial activities of chitosan and its water‐soluble derivatives on E. coli were studied according to four influencing factors in vitro . The antibacterial study showed that chitosan, O ‐hydroxyethyl chitosan (O‐HECS), and O ‐carboxymethyl chitosan (O‐CMCS) could inhibit the growth of the microbial.…
Abstract Soluble polyimides were prepared from suitable monomers and were evaluated for their thermal and mechanical properties. The polymers were processed into films for use as supports for transparent, conductive indium tin oxide (ITO) layers. After deposition, annealing in vacuo at temperatures up to 400°C was per…
Centimeter long aluminum‐doped zinc oxide (AZO) nanofibers were prepared by electrospinning from polyvinyl alcohol (PVA) aqueous solutions, and the fibers with controlled morphology were expected to have potential applications in gas‐sensing and optoelectronic devices. In our research, the diameter and morphology of t…
Pristine (carboxylated) and aminated polypyrrole nanotubes were successfully fabricated using vapor deposition polymerization with a template. In particular, aminated polypyrrole nanotubes were readily synthesized by modifying the nanotube surface with open polyamine chains. Pristine and aminated polymer nanotubes wer…
A series of diatomite catalysts were treated and characterized. For the first time, the resulting materials were used in catalysis for the hydroxylation of phenol with H2O2 and showed very high hydroxylation activity due to the Fe species in the diatomite. The effect of HCl treatment, contents of catalysts and H2O2 we…
Abstract In this study, we investigated the relationships between the thermal properties versus maturity and fineness ( H ) of 80 selected cotton fiber samples. The instrument measurements for maturity and H were (1) micronaire as determined with a high‐volume instrument, (2) maturity ratio and H as determined with an…
Abstract The catalytic performance of a cavity‐containing [(porphyrin)Mn] in the epoxidation of alkenes is described. Inside the catalyst cavity, nitrogen‐containing axial ligands can be bound to the porphyrin metal with high association constants, resulting in strong activation of the catalyst in the presence of only…
Meeting point: Carbon nanotubes (CNTs) are produced by an equimolar reaction between C2H2 and CO2 (see scheme). CO2 can be introduced as a gas or a carbonate support of the metal particles. When CaCO3 is used, the growth of a nanotube stems from the triple-point junction, which corresponds to the area surrounding the…