Materials Literature
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Abstract A novel amphiphilic biodegradable triblock copolymer (PGL‐PLA‐PGL) with polylactide (PLA) as hydrophobic middle block and poly(glutamic acid) (PGL) as hydrophilic lateral blocks was successfully synthesized by ring‐opening polymerization (ROP) of L ‐lactide (LA) and N ‐carboxy anhydride (NCA) consecutively an…
Abstract Cationic copolymerization of L,L ‐lactide (LA) and ε‐caprolactone (CL) initiated by low molecular weight diols in the presence of acid catalyst gives corresponding copolyesters terminated at both ends with hydroxyl groups in practically quantitative yield. Copolymerization proceeds by Activated Monomer mechan…
High Resolution Image Download MS PowerPoint Slide The electron storage and discharge properties of single wall carbon nanotubes (SWCNTs) are probed by their interaction with radiolytically and photolytically produced methyl viologen (MV +• ) radicals. Quantitative estimation of stored electrons amounts to one electro…
We have investigated the stability, electronic, and magnetic properties of transition-metal-doped $M{\mathrm{B}}_{n}$ clusters ($M=\mathrm{Cr},\mathrm{Mn},\mathrm{Fe},\mathrm{Co},\mathrm{Ni}$, $n\ensuremath{\leqslant}7$) using first-principles density functional theory with generalized gradient approximation. The equi…
Single‐phase BaCoTiFe 10 O 19 (BaCoTi‐M) nanoparticles were prepared by a modified sol–gel process, using metallic chlorides as starting materials. The physical chemistry process of BaCoTi‐M formation, the interdependences between composition, technological conditions, microstructure, and magnetic properties were stud…
Two novel mixed-valent manganese phosphonate clusters [MnIIMnIII12O6(OH)6(O3PC6H11)10(py)6] (1) and [MnII4MnIII18O12(O3PC6H11)8(O2CCH3)22(H2O)6(py)2] (2) are reported in this paper. Complex 1 is the first carboxylate-free manganese phosphonate cluster. While compound 2 appears to be the largest manganese cluster thus…
Abstract ZnO thin films were prepared by spray pyrolytic decomposition of zinc acetate onto a glass substrate. These films were analyzed for the optical and electrical properties. Optical studies show that in these films the electronic transition is of the direct transition type. The optical energy gap for the films o…
Abstract Several poly(arylene thioether)s ( PTEs ) containing a fluorene moiety were synthesized by the polycondensation of masked dithiols such as 9,9‐bis(4‐( N,N ‐dimethyl‐ S ‐carbamoyl)phenyl)fluorene and various difluoroarenes. All PTEs were obtained in quantitative yields. The PTEs showed good thermal stability:…
Abstract Combining polymeric architectures with metal ions produces hybrid materials with extremely rich properties. We are studying polymers containing terpyridine in the side chain. In this report, the chelation of lanthanide ions, Eu 3+ , Tb 3+ , and Dy 3+ resulted in metal functionalized copolymers that exhibited…
Dual control: Hybrid silica–nanocrystal–organic dye superstructures comprising fluorescein isothiocyanate (FITC)-doped silica cores, embedded CdTe quantum dots, and an outer silica shell display well-resolved dual fluorescence emission. Multicolor encoding fluorescent probes are generated by modulating the fluorescenc…
Abstract The effect of organically modified clay on the morphology and properties of poly(propylene) (PP) and poly[(butylene succinate)‐ co ‐adipate] (PBSA) blends is studied. Virgin and organoclay modified blends were prepared by melt‐mixing of PP, PBSA and organoclay in a batch‐mixer at 190 °C. Scanning electron mic…
Structural electrodes of anhydrous RuO 2 vertical nanorods encased in hydrous RuO 2 have been prepared via chemical vapor deposition (CVD) followed by electrochemical deposition. The composite structures are studied using scanning electron microscopy, transmission electron microscopy, X-ray diffraction, and X-ray phot…
We report ultra-large room-temperature plasticity of nanocrystalline Ni subjected to uniaxial compression. Up to 200% true plastic strain is achieved with a steady flow stress of ∼2 GPa at strain rates ranging from 10 -3 to 10 -1 s -1 . The low temperature, high strain rate, and high flow stress demonstrate that the o…
Candida antarctica Lipase B (CALB), a metal-free enzyme, was successfully employed as catalyst for ring-opening copolymerization of omega-pentadecalactone (PDL) with p-dioxanone (DO) under mild reaction conditions (<80 degrees C, atmospheric pressure). Poly(PDL-co-DO) with high molecular weight (Mw > 30 000) and a wid…
The extreme thermoacidophiles of the genus Sulfolobus are among the best-studied archaea but have lacked small, reliable plasmid vectors, which have proven extremely useful for manipulating and analyzing genes in other microorganisms. Here we report the successful construction of a series of Sulfolobus-Escherichia col…
Porous mullite (3Al 2 O 3 ·2SiO 2 ) ceramics with an open porosity up to 92.9% were fabricated by a gel freeze‐drying process. An alumina (Al 2 O 3 ) gel mixed with ultrafine silica (SiO 2 ) was frozen and sublimation of ice crystals was carried out by drying the frozen body under a low pressure. Porous mullite cerami…
Following our recent experimental work on electrical fatigue [Phys. Rev. Lett. 97, 177601 (2006)], a theory of a charge-injection fatigue model is developed, emphasizing the extremely high depolarization electric field generated near the electrodes by bound charges at the tip of needlelike domains during switching. In…
DC resistivity, dielectric, and magnetic properties of Mg‐ferrite ceramics (Mg 1− x Cu x Fe 1.98 O 4 , with x =0.10–0.30, and Mg 0.90− x Co x Cu 0.10 Fe 1.98 O 4 , with x =0.05–0.20) were investigated. A primary objective is to develop magneto‐dielectric materials with almost equal values of permeability and permittiv…
ADVERTISEMENT RETURN TO ISSUEPREVCommunication to the...Communication to the EditorNEXTShear-Induced Conformational Ordering in the Melt of Isotactic PolypropyleneHaining An, Baijin Zhao, Zhe Ma, Chunguang Shao, Xiao Wang, Yapeng Fang, Liangbin Li, and Zhongming LiView Author Information College of Polymer Science and…
A novel method for the preparation of a thin oxidic proton‐conducting electrolyte is presented. This kind of supported film was studied in detail as it is applicable for IT–SOFC, H 2 membranes, and advanced catalytic converters. Thin‐film (∼5 μm) proton‐conducting membranes with the nominal composition BaZr 0.85 Y 0.1…