Timothy A. Hudson、K.J. Berry、Boujemaa Moubaraki 等 5 位作者2006-04-06Inorganic Chemistry
Aqueous reaction mixtures containing citric acid, guanidinium carbonate, and a range of metal cations (Mg2+, Mn2+, Fe2+, Co2+, Ni2+, and Zn2+) at room temperature give crystalline products of composition [C(NH2)3]8[(M(II))4(cit)4].8H2O (cit = citrate). In all cases, the crystals are suitable for single-crystal X-ray d…
Metal-Catalyzed Oxygenation MechanismsMagnetism in coordination complexesLanthanide and Transition Metal Complexes
Ye Xu、W. A. Shelton、William F. Schneider2006-04-06The Journal of Physical Chemistry A
The catalytic properties of transition metal particles often depend crucially on their chemical environment, but so far, little is known about how the effects of the environment vary with particle size, especially for clusters consisting of only a few atoms. To gain insight into this topic, we have studied the oxygen…
Catalytic Processes in Materials ScienceCatalysis and Oxidation ReactionsElectrocatalysts for Energy Conversion
Todd J. Gibson、Regina M. Murphy2006-04-06Protein Science
Under conditions of acidic pH and elevated temperature, insulin partially unfolds and aggregates into highly structured amyloid fibrils. Aggregation of insulin leads to loss of activity and can trigger an unwanted immune response. Compounds that prevent protein aggregation have been used to stabilize insulin; these co…
Alzheimer's disease research and treatmentsChemical Synthesis and AnalysisSupramolecular Self-Assembly in Materials
Mackay B. Steffensen、E. Hollink、Frank Kuschel 等 5 位作者2006-04-06Journal of Polymer Science Part A Polymer Chemistry
A comprehensive and chronological account of dendrimers based on [1,3,5]-triazines is provided. Synthetic strategies to install the triazine through cycloaddition, cyclotrimerization, and nucleophilic aromatic substitution of cyanuric chloride are discussed. Motivations and applications of these architectures are surv…
Synthesis and Characterization of Heterocyclic CompoundsDendrimers and Hyperbranched PolymersDNA and Nucleic Acid Chemistry
Yiwang Chen、Dongmei Liu、Qilan Deng 等 5 位作者2006-04-06Journal of Polymer Science Part A Polymer Chemistry
Abstract The direct preparation of grafting polymer brushes from commercial poly (vinylidene fluoride) (PVDF) films with surface‐initiated atom transfer radical polymerization (ATRP) is demonstrated. The direct initiation of the secondary fluorinated site of PVDF facilitated grafting of the hydrophilic monomers from t…
Polymer Surface Interaction StudiesSurface Modification and SuperhydrophobicityAdvanced Polymer Synthesis and Characterization
Tai-I Weng、G. Y. Guo2006-04-06arXiv
Two-dimensional (2D) honeycomb photonic crystals with cylinders and connecting walls have the potential to have a large full band gap. In experiments, 2D photonic crystals do not have an infinite height, and therefore, we investigate the effects of the thickness of the walls, the height of the slabs and the type of th…
cond-mat.otherMaterials Science
Kyeong Youl Jung、Hyun‐Woo Lee、Ha‐Kyun Jung2006-04-06Chemistry of Materials
(Sr 1 - x, Zn x ) 1 - y (Al 1.98, B 0.02 )O 4:Eu y 2+ green phosphor particles for ultraviolet light-emitting diodes (UV LEDs) were prepared by spray pyrolysis and their luminescent properties were investigated with changing the reducing temperature, the concentration of the activator, and the ratio of Sr to Zn. For t…
Luminescence Properties of Advanced MaterialsAmmonia Synthesis and Nitrogen ReductionAdvanced Photocatalysis Techniques
N. Akima、Yoshihiro Iwasa、S. Brown 等 11 位作者2006-04-06Advanced Materials
Absorption spectroscopy of stretch-aligned single-walled carbon nanotube (SWNT)/polymer composite films from the terahertz through the visible region of the electromagnetic spectrum reveal that the peak centered near 100 cm–1 is highly polarized along the tube axis (see figure). This result provides new information on…
Graphene research and applicationsMechanical and Optical ResonatorsCarbon Nanotubes in Composites
K. Moazzami、Timothy Murphy、Jamie Phillips 等 5 位作者2006-04-06Semiconductor Science and Technology
Photoconductivity is observed in ZnO epilayers due to photoexcitation in the visible spectral region of 400–700 nm, below the ZnO bandgap energy of 3.4 eV. Photoconductive transients due to visible photoexcitation have time constants in the order of minutes. Treatment of the ZnO surface with SiO2 passivation layers re…
ZnO doping and propertiesChalcogenide Semiconductor Thin FilmsGas Sensing Nanomaterials and Sensors
Deepa Kasinathan、A. B. Kyker、D. J. Singh2006-04-06arXiv
The magnetic nature of Cs$_{2}$AgF$_{4}$, an isoelectronic and isostructural analogue of La$_2$CuO$_4$, is analyzed using density functional calculations. The ground state is found to be ferromagnetic and nearly half metallic. We find strong hybridization of Ag-$d$ and F-$p$ states. Substantial moments reside on the F…
Materials Science
Yanwei Ma、Aixia Xu、Xianping Zhang 等 6 位作者2006-04-06arXiv
The effect of high magnetic fields on the current carrying properties of both MgB2 bulks and Fe-sheathed tapes was investigated following different thermal sequences. It is found that application of a large magnetic field during processing results in the quite uniform microstructure and the better connectivity between…
SuperconductivityMaterials Science
Yu-xi Liu、L. F. Wei、J. S. Tsai 等 4 位作者2006-04-06arXiv
We propose an experimentally realizable method to control the coupling between two flux qubits. In our proposal, the bias fluxes are always fixed for these two inductively-coupled qubits. The detuning of these two qubits can be initially chosen to be sufficiently large, so that their initial interbit coupling is almos…
SuperconductivityMaterials Sciencequant-ph
Wenbin Zhong、Shoumei Liu、Xianhong Chen 等 5 位作者2006-04-06Macromolecules
Polypyrrole (PPy) nanowire networks have been synthesized in high yield (higher than 90%) by chemical oxidative polymerization of pyrrole in the presence of hexadecyltrimethylammonium bromide (HTAB) and organic diacids (oxalic acid, tartaric acid, or glutaric acid) and triacid (citric acid). The diameter of nanowire i…
Advanced Sensor and Energy Harvesting MaterialsConducting polymers and applicationsSupercapacitor Materials and Fabrication
Guoqiang Li、D. Mathine、Pouria Valley 等 12 位作者2006-04-06Proceedings of the National Academy of Sciences
Presbyopia is an age-related loss of accommodation of the human eye that manifests itself as inability to shift focus from distant to near objects. Assuming no refractive error, presbyopes have clear vision of distant objects; they require reading glasses for viewing near objects. Area-divided bifocal lenses are one e…
Liquid Crystal Research AdvancementsAdvanced Optical Imaging TechnologiesPhotonic Crystals and Applications
Yu-Ming Lin、Joerg Appenzeller、Joachim Knoch 等 5 位作者2006-04-06Nano Letters
We present a systematic study on low-frequency current fluctuations of nanodevices consisting of one single semiconducting nanotube, which exhibit significant 1/f-type noise. By examining devices with different switching mechanisms, carrier types (electrons vs holes), and channel lengths, we show that the 1/f fluctuat…
Nanopore and Nanochannel Transport StudiesCarbon Nanotubes in CompositesQuantum and electron transport phenomena
Rafael C. Howell、Steven D. Conradson、Angel J. Garcia-Adeva2006-04-06arXiv
The phase coexistence of chemically ordered L1_0 and chemically disordered structures within binary alloys is investigated, using the NiMn system as an example. Theoretical and numerical predictions of the signatures one might expect in data from local and extended probes are presented, in an attempt to explain the pr…
Materials Science
Bin Yu、Pingchuan Sun、Tiehong Chen 等 7 位作者2006-04-06OpenAlex
Self-assembly of block copolymers confined in cylindrical nanopores is studied systematically using a simulated annealing technique. For diblock copolymers which form two-dimensional hexagonally packed cylinders with period L0 in the bulk, novel structures such as helices and stacked toroids spontaneously form inside…
Advanced Polymer Synthesis and CharacterizationBlock Copolymer Self-AssemblyNanopore and Nanochannel Transport Studies
John Androulakis、Kuei‐Fang Hsu、Robert Pcionek 等 9 位作者2006-04-06OpenAlex
The p-type Ag(Pb1–ySny)mSbTe2+m materials shown in the figure demonstrate promising thermoelectric properties that are controlled with the parameters y and m. They can reach a maximum figure of merit of ∼ 1.45 at 630 K. This surpasses the figure of merit of the present state-of-the-art p-type materials such as TAGS (1…
Advanced Thermoelectric Materials and DevicesPerovskite Materials and ApplicationsThermal properties of materials
Kazuki Fukushima、Yoshiharu Kimura2006-04-06OpenAlex
Abstract Polymeric materials prepared from renewable natural resources are now being accepted as “bio‐based polymers”, because they are superior to the conventional petroleum‐based polymers in reducing the emission of carbon dioxide. Among them, poly( L ‐lactide) (PLLA) prepared by fermentation and polymerization is p…
biodegradable polymer synthesis and propertiesBone Tissue Engineering MaterialsCarbon dioxide utilization in catalysis
Y. Zhang、Zhigang Jiang、Joshua P. Small 等 10 位作者2006-04-06OpenAlex
The quantum Hall (QH) effect in two-dimensional electrons and holes in high quality graphene samples is studied in strong magnetic fields up to 45 T. QH plateaus at filling factors $\ensuremath{\nu}=0,\ifmmode\pm\else\textpm\fi{}1,\ifmmode\pm\else\textpm\fi{}4$ are discovered at magnetic fields $B>20\text{ }\text{…
Topological Materials and PhenomenaGraphene research and applicationsQuantum and electron transport phenomena