Elena Groppo、Carlo Lamberti、Silvia Bordiga 等 6 位作者2005-07-15The Journal of Physical Chemistry B
This work reports the first complete FTIR characterization of H2, N2 and C2H4 molecular complexes formed on the Cr(II) sites in the Phillips catalyst. The use of a silica aerogel as support for Cr(II) sites, substituting the conventional aerosil material, allowed us to obtain a remarkable increase in the signal-to-noi…
Advanced Chemical Physics StudiesCatalytic Processes in Materials ScienceCatalysis and Oxidation Reactions
B‐H Hu、Phillip B. Messersmith2005-07-15Orthodontics and Craniofacial Research
OBJECTIVES: To design an in-situ gelling hydrogel capable of solidifying rapidly under physiologic conditions into a hydrogel capable of adhering tissue surfaces together. DESIGN: Multifunctional polymers containing covalently bound peptide substrates of transglutaminase were designed. EXPERIMENTAL VARIABLE: Enzyme cr…
Hydrogels: synthesis, properties, applicationsPolymer Surface Interaction StudiesBlood properties and coagulation
Susanne Wagner、Deniz Kahraman、Hans Kungl 等 8 位作者2005-07-15Journal of Applied Physics
Relaxor ferroelectrics near the morphotropic phase boundary were prepared by pressureless sintering at various temperatures in order to study the influence of grain size on phase composition and electrical properties. Investigations of the microstructure indicate an increase in grain size from 0.5to3.7μm when the sint…
Ferroelectric and Piezoelectric MaterialsMultiferroics and related materialsMicrowave Dielectric Ceramics Synthesis
Md. Nazrul Islam、Asima Pradhan、Satyendra Kumar2005-07-15Journal of Applied Physics
Raman scattering (RS) from semiconductor nanostructures provide excellent information on the size of the crystallites. Processing history of most nanocrystalline semiconductors suggests natural incorporation of a distribution of crystallite sizes. In this paper, we report on the influence of crystallite size distribut…
Thin-Film Transistor TechnologiesSilicon Nanostructures and PhotoluminescenceNanowire Synthesis and Applications
S. Schumann2005-07-15Materials science forum
The use of magnesium in motor vehicles today and in future depends on numerous technical and economical factors, though the cost factor is essential. How might use of magnesium in vehicles develop, what prerequisites are necessary, what R&D efforts are required These questions will be addressed as follows based on…
Magnesium Alloys: Properties and ApplicationsAluminum Alloys Composites PropertiesHydrogen Storage and Materials
Masanori Fukushima、Nobuto Managaki、Minoru Fujii 等 5 位作者2005-07-15Journal of Applied Physics
A 1.54-μm emission from erbium-doped sol-gel SiO2 was strongly enhanced by doping Au nanoparticles. The enhancement factor depended on Au concentration and was the largest at the concentration of 1.0mol%. The photoluminescence enhancement was accompanied by the lengthening of the lifetime, suggesting that the enhancem…
Gold and Silver Nanoparticles Synthesis and ApplicationsSilicon Nanostructures and PhotoluminescenceNonlinear Optical Materials Studies
S. Gallini、J. R. Jurado、M.T. Colomer2005-07-15Chemistry of Materials
La (1 - x ) Sr ( x ) PO 4 materials are very stable at high temperature and water vapor partial pressure and they show protonic conductivity; thus, they could be used as electrolytes in HTPFCs (high-temperature protonic fuel cells), hydrogen sensors, and hydrogen separation technology. This work describes the combusti…
Luminescence Properties of Advanced MaterialsGas Sensing Nanomaterials and SensorsThermal and Kinetic Analysis
Yang Zhao、Jinsong Wang、Guangzhao Mao2005-07-15Optics Letters
A two-dimensional (2D) subwavelength nanostructure for antireflection coating is fabricated upon a transparent substrate. Self-assembled 2D colloidal crystals are used as a nanoscale composite material with controlled thickness and low refractive index. The feature size of the structure is approximately 105 nm. The st…
Photonic and Optical DevicesPhotonic Crystals and ApplicationsOptical Coatings and Gratings
V. Bobnar、Barbara Malič、Janez Holc 等 6 位作者2005-07-15Journal of Applied Physics
The elastic strain of lead-free relaxor K0.5Na0.5NbO3–SrTiO3 ceramic system, induced by applied electric fields with amplitudes up to 40kV∕cm, has been investigated. The strain response, being similarly low (order of 10−5) as in the classical lead magnesium niobate relaxor, is shown to be of solely electrostrictive or…
Ferroelectric and Piezoelectric MaterialsMultiferroics and related materialsMicrowave Dielectric Ceramics Synthesis
Martin Hulman、Viera Skákalová、Siegmar Roth 等 4 位作者2005-07-15Journal of Applied Physics
Graphite and single-wall carbon nanotubes irradiated by γ rays of energy of 1.3 MeV were investigated by Raman spectroscopy. Irradiation generates defects in the lattice as confirmed by the increase of the intensity of the defect-induced D line in both materials. On the other hand, the intensity of the radial breathin…
Carbon Nanotubes in CompositesGraphene research and applicationsIon-surface interactions and analysis
Deepti S. Sidhaye、Sudhir Kashyap、Murali Sastry 等 5 位作者2005-07-15Langmuir
Photoresponsive gold nanoparticle networks were prepared by functionalizing them with azobenzene derivatives. A network can be formed when a linker molecule constituting the azobenzene moiety suitably derivatized on either side with gold surface sensitive groups such as thiols and amines is added to the nanoparticle s…
Gold and Silver Nanoparticles Synthesis and ApplicationsMolecular Junctions and NanostructuresPhotochromic and Fluorescence Chemistry
Almudena Prudencio、Robert C. Schmeltzer、Kathryn E. Uhrich2005-07-15Macromolecules
A series of salicylic acid-derived poly(anhydride-esters) were synthesized by melt polym erization methods, in which the structures of the molecule ("linker") linking together the two salicylic acids were varied. To determine the relationship between the linker and the physical properties of the corresponding poly(anh…
biodegradable polymer synthesis and propertiesPolymer Surface Interaction StudiesSynthesis and properties of polymers
Haijun Xu、Rushikesh A. Matkar、Thein Kyu2005-07-15Physical Review E
Spatio-temporal growth of isotactic polystyrene single crystals during isothermal crystallization has been investigated theoretically based on the phase field model by solving temporal evolution of a nonconserved phase order parameter coupled with a heat conduction equation. In the description of the total free energy…
Solidification and crystal growth phenomenaCrystallization and Solubility Studiesnanoparticles nucleation surface interactions
Martin Moskovits、Blanka Vlčková2005-07-15The Journal of Physical Chemistry B
Metal sols are often stabilized in solution by the presence of a charged double layer surrounding each colloidal nanoparticle that produces a coulomb barrier to aggregation. The nanoparticles can be induced to aggregate by replacing the charged surface species by uncharged adsorbate. We present a simple analysis that…
Nanoparticles: synthesis and applicationsGold and Silver Nanoparticles Synthesis and ApplicationsCoagulation and Flocculation Studies
Shigeyuki Toki、Igors Šics、Benjamin S. Hsiao 等 7 位作者2005-07-15Macromolecules
The nature of strain-induced crystallization in vulcanized polyisoprene rubbers was investigated by in situ synchrotron wide-angle X-ray diffraction under varying thermomechanical conditions. In particular, the methods of constrained cooling and constrained heating under constant strain were used to explore the relati…
Polymer crystallization and propertiesPolymer Nanocomposites and PropertiesElasticity and Material Modeling
Jacob D. Stevenson、Peter G. Wolynes2005-07-15The Journal of Physical Chemistry B
Thermodynamics and kinetics are thought to be linked in glass transitions. The quantitative predictions of alpha-relaxation activation barriers provided by the theory of glasses based on random first-order transitions are compared with the experimental results for 44 substances. The agreement found between the predict…
Material Dynamics and PropertiesGlass properties and applicationsChemical Thermodynamics and Molecular Structure
Emma Kathryn Payne、Nathaniel L. Rosi、Can Xue 等 4 位作者2005-07-15Angewandte Chemie International Edition
Biological templates: Diatom cell walls were coated with metallic films and then subsequently dissolved to yield nanostructured metallic microshells that exhibit the structural characteristics of the diatom templates. The unique nanostructural details of the microshells (see image) make them useful as substrates for s…
Advanced biosensing and bioanalysis techniquesPolymer Surface Interaction StudiesDiatoms and Algae Research
Yi Lin、Bing Zhou、Robert B. Martin 等 9 位作者2005-07-15The Journal of Physical Chemistry B
Strong luminescence emissions over a broad wavelength region were detected from well-dispersed carbon nanotubes in most functionalized samples, even with excitation wavelengths into the near-IR. Apparently, the better dispersion and functionalization of the nanotubes resulted in more intense luminescence emissions. Th…
Carbon Nanotubes in CompositesMechanical and Optical ResonatorsNanotechnology research and applications
Sandra Gracin、Marketta Uusi-Penttilä、Åke C. Rasmuson2005-07-15Crystal Growth & Design
p -Aminobenzoic acid crystallizes in two different polymorphic forms: the α-form and the β-form. The α-form crystals are needle-shaped, while the β-form crystals have a more favorable prismatic shape. The system is enantiotropic with the transition temperature at approximately 25 °C. Below the transition temperature,…
Spectroscopy and Quantum Chemical StudiesCrystallization and Solubility Studiesnanoparticles nucleation surface interactions
Gordana Vunjak‐Novakovic、Lorenz Meinel、Gregory H. Altman 等 4 位作者2005-07-15Orthodontics and Craniofacial Research
The clinical utility of tissue engineering depends upon our ability to direct cells to form tissues with characteristic structural and mechanical properties across different hierarchical scales. Ideally, an engineered graft should be tailored to (re)establish the structure and function of the native tissue being repla…
Osteoarthritis Treatment and MechanismsPeriodontal Regeneration and TreatmentsSilk-based biomaterials and applications