Chao Liu、M. P. Dobhal、Manivannan Ethirajan 等 11 位作者2008-10-02Journal of the American Chemical Society
The oxidation of bacteriopyropheophorbide with ferric chloride hexahydrate or its anhydrous form produced the ring-D oxidized (ring-B reduced) chlorin in >95% yield. Replacing the five-member isocyclic ring in bacteriopyropheophorbide- a with a fused six-member N-butylimide ring system made no difference in regioselec…
Photodynamic Therapy Research StudiesPorphyrin and Phthalocyanine ChemistryPhotosynthetic Processes and Mechanisms
Qichun Zhang、Xianhui Bu、Zhien Lin 等 5 位作者2008-10-02Inorganic Chemistry
Using predesigned tetrahedral quadridentate linker tetrakis(4-pyridyloxymethylene)methane (TPOM) as the organic linker, tetrahedral P1 clusters ([Cd8S(SPh)16](2-)) and C1 clusters ([Cd17S4(SPh)28](2-)) have been assembled into beltlike (MCOF-9) or chainlike (MCOF-10) configurations, as determined by single-crystal X-r…
Nanocluster Synthesis and ApplicationsOrganometallic Compounds Synthesis and CharacterizationCrystal Structures and Properties
Kris T. Delaney、Maxim Mostovoy、Nicola A. Spaldin2008-10-02arXiv
We demonstrate that magnetic vortices in which spins are coupled to polar lattice distortions via superexchange exhibit an unusually large linear magnetoelectric response. We show that the periodic arrays of vortices formed by frustrated spins on Kagomé lattices provide a realization of this concept; our {\it ab initi…
Materials Science
Erich H. Kisi、Christopher J. Howard2008-10-02Oxford University Press eBooks
This book covers the theory, practicalities, and the extensive applications of neutron powder diffraction in materials science, physics, chemistry, mineralogy, and engineering. Various highlight applications of neutron powder diffraction are outlined in the introduction, then the theory is developed and instrumentatio…
X-ray Diffraction in CrystallographyNuclear Physics and Applications
Wenbo Yue、Wuzong Zhou2008-10-02Progress in Natural Science Materials International
Since the discovery of many types of mesoporous silicas, such as SBA-15, KIT-6, FDU-12 and SBA-16, porous crystalline transition metal oxides, such as Cr2O3, Co3O4, In2O3, NiO, CeO2, WO3, Fe2O3 and MnO2, have been synthesized using the mesoporous silicas as hard templates. Several synthetic methods have been developed…
Catalytic Processes in Materials ScienceMesoporous Materials and CatalysisPolyoxometalates: Synthesis and Applications
Jan Roth、Victoria Albrecht、Mirko Nitschke 等 10 位作者2008-10-02Langmuir
The surface properties of poly(dimethyl siloxane) (PDMS) layers screen printed onto silicon wafers were studied after oxygen and ammonia plasma treatments and subsequent grafting of poly(ethylene -alt-maleic anhydride) (PEMA) using X-ray photoelectron spectroscopy (XPS), roughness analysis, and contact angle and elect…
Surface Modification and SuperhydrophobicityAdvanced Sensor and Energy Harvesting MaterialsAdhesion, Friction, and Surface Interactions
Clayton Jeffryes、Timothy Gutu、Jun Jiao 等 4 位作者2008-10-02ACS Nano
Diatoms are single-celled algae that make silica shells or frustules with intricate nanoscale features imbedded within periodic two-dimensional pore arrays. A two-stage photobioreactor cultivation process was used to metabolically insert titanium into the patterned biosilica of the diatom Pinnularia sp. In Stage I, di…
Algal biology and biofuel productionPaleontology and Stratigraphy of FossilsDiatoms and Algae Research
Lili He、Nam‐Jung Kim、Hao Li 等 5 位作者2008-10-02Journal of Agricultural and Food Chemistry
The safety of imported seafood products because of the contamination of prohibited substances, including crystal violet (CV) and malachite green (MG), raised a great deal of concern in the United States. In this study, a fractal-like gold nanostructure was developed through a self-assembly process and the feasibility…
Melamine detection and toxicityGold and Silver Nanoparticles Synthesis and ApplicationsDye analysis and toxicity
H. Dias Alves、A. S. Molinari、H. Xie 等 4 位作者2008-10-02arXiv
The electronic properties of interfaces between two different solids can differ strikingly from those of the constituent materials. For instance, metallic conductivity, and even superconductivity, have been recently discovered at interfaces formed by insulating transition metal oxides. Here we investigate interfaces b…
Materials Science
Y. Itoh、T. Mizoguchi、K. Yoshimura2008-10-02arXiv
We report a novel critical exponent delta=3/2 of magnetization curves M=H^{1/delta} near the ferromagnetic quantum phase transitions of Sr1-xAxRuO3 (A = Ca, La0.5Na0.5, and La), which the mean field theory of the Ginzburg-Landau-Wilson type fails to reproduce. The effect of dirty ferromagnetic spin fluctuations might…
Strongly Correlated ElectronsMaterials Science
M. V. Erëmin、Dmitry Zakharov、H.‐A. Krug von Nidda 等 9 位作者2008-10-02Physical Review Letters
The spin dynamics of the prototypical quasi-one-dimensional antiferromagnetic Heisenberg spin S=1/2 chain KCuF3 is investigated by electron spin resonance spectroscopy. Our analysis shows that the peculiarities of the spin dynamics require a new dynamical form of the antisymmetric anisotropic spin-spin interaction. Th…
Physics of Superconductivity and MagnetismAdvanced Condensed Matter PhysicsMultiferroics and related materials
M Maria Stekelenburg、Marcel C. M. Rutten、Luc H. E. H. Snoeckx 等 4 位作者2008-10-02Tissue Engineering Part A
Vascular tissue engineering represents a promising approach for the development of living small-diameter vascular grafts that can be used for replacement therapy. The culture of strong human tissue-engineered (TE) vascular grafts has required long culture times, up to several months, whether or not combined with gene…
Bone Tissue Engineering MaterialsTissue Engineering and Regenerative MedicineElectrospun Nanofibers in Biomedical Applications
M. Weiler、A. Brandlmaier、S. Gepraegs 等 10 位作者2008-10-02arXiv
The control of magnetic properties by means of an electric field is an important aspect in magnetism and magnetoelectronics. We here utilize magnetoelastic coupling in ferromagnetic/piezoelectric hybrids to realize a voltage control of magnetization orientation at room temperature. The samples consist of polycrystalli…
Materials Science
Robert Lam、Mark Chen、Erik Pierstorff 等 6 位作者2008-10-02ACS Nano
Nanodiamonds (NDs) of 2-8 nm diameters physically bound with the chemotherapeutic agent doxorubicin hydrochloride (DOX) were embedded within a parylene C polymer microfilm through a facile and scalable process. The microfilm architecture consists of DOX-ND conjugates sandwiched between a base and thin variable layer o…
Carbon Nanotubes in CompositesForce Microscopy Techniques and ApplicationsDiamond and Carbon-based Materials Research
I. Panneer Muthuselvam、R. N. Bhowmik2008-10-02arXiv
We report a correlation between structural phase stability and magnetic properties of Co2FeO4 spinel oxide. We employed mechanical alloying and subsequent annealing to obtain the desired samples. The particle size of the samples changes from 25 nm to 45 nm. The structural phase separation of samples, except sample ann…
Materials Science
Masatomo Uehara、Kenich Ashikawa、Yoshimasa Aka 等 4 位作者2008-10-02arXiv
Hole carrier doping has been tried to pseudo-low-dimensional material La2RuO5 by substituting La3+ with Cd2+. Single phased samples of La2-xCdxRuO5 with x up to 0.5 have been successfully obtained and also high pressure O2 annealing has been performed to the x=0.5 sample. Although the formal ionic state of Ru is expec…
Materials ScienceStrongly Correlated Electrons
C. R. Mariappan、B. Roling2008-10-02arXiv
Electro-thermal poling experiments were carried out on a bioactive glass, and the kinetics of the Na+ ion depletion layer formation under the anode was studied in-situ by means of ac impedance spectroscopy. One important finding is a linear relation between the depletion layer thickness and the applied voltage, which…
cond-mat.otherMaterials Science
Juan Maria Garcia-Lastra、Kristian S. Thygesen、Mikkel Strange 等 4 位作者2008-10-02arXiv
We use DFT to study the effect of molecular adsorbates on the conductance of metallic carbon nanotubes. The five molecules considered (NO2, NH2, H, COOH, OH) lead to similar scattering of the electrons. The adsorption of a single molecule suppresses one of the two available channels of the CNT at low bias conductance.…
Mesoscale and Nanoscale PhysicsMaterials Science
Elba Gomar-Nadal、Brad R. Conrad、William G. Cullen 等 4 位作者2008-10-02arXiv
Pentacenequinone (PnQ) impurities have been introduced into a pentacene source material at number densities from 0.001 to 0.474 to quantify the relative effects of impurity content and grain boundary structure on transport in pentacene thin-film transistors. Atomic force microscopy (AFM) and electrical measurements of…
Materials Science
Christoph Schlegel、Joris van Slageren、M. Manoli 等 5 位作者2008-10-02Physical Review Letters
Direct evidence of quantum coherence in a single-molecule magnet in a frozen solution is reported with coherence times as long as T{2}=630+/-30 ns. We can strongly increase the coherence time by modifying the matrix in which the single-molecule magnets are embedded. The electron spins are coupled to the proton nuclear…
Lanthanide and Transition Metal ComplexesMagnetism in coordination complexesElectron Spin Resonance Studies