Patricia Eisenberg、Rosa Erra‐Balsells、Yoko Ishikawa 等 6 位作者2002-01-16Macromolecules
The polycondensation of [3-(methacryloxy)propyl]trimethoxysilane was performed in bulk, using 98 wt % formic acid (molar ratio HCOOH/Si = 3 or 6), at 50 or 70 °C, for periods of time of up to 1 month. The resulting silsesquioxanes (SSOs) were characterized by 1 H NMR, FTIR, SEC, UV−MALDI−TOF MS (linear, reflector, and…
Silicone and Siloxane ChemistrySynthesis and properties of polymersAdvanced ceramic materials synthesis
A. A. Lucas、F. Moreau、Ph. Lambin2002-01-16Reviews of Modern Physics
This colloquium discusses the atomic structure of carbon nanotubes as deduced from high-resolution electron microscopy and electron diffraction in transmission through a single nanotube. The principal features of the observed micrographs are interpreted in terms of the cylindrical, chiral geometry of the atomic distri…
Graphene research and applicationsFullerene Chemistry and ApplicationsCarbon Nanotubes in Composites
Sanjay Mathur、Michael Veith、Hao Shen 等 5 位作者2002-01-16Chemistry of Materials
Fabrication of an oxide−oxide nanocomposite, containing a homogeneous dispersion of NdAlO 3 nanocrystals in an Al 2 O 3 matrix, is achieved by employing a single molecular compound, [NdAl 3 (OPr i ) 12 (Pr i OH)], in the sol−gel process. X-ray diffraction patterns of the composite material show NdAlO 3 to be the only…
Luminescence Properties of Advanced MaterialsNuclear materials and radiation effectsGlass properties and applications
Gérard Liger‐Belair、P. M. Adler、Cédric Voisin 等 5 位作者2002-01-16Langmuir
In this study, bubble production in a glass of champagne was used as a common tool to illustrate and better understand the nonclassical heterogeneous bubble nucleation from pre-existing gas cavities, referred as type IV nucleation in a recent review article (Jones et al. Adv. Colloid Interface Sci . 1999, 80, 27−50).…
nanoparticles nucleation surface interactionsPickering emulsions and particle stabilizationMinerals Flotation and Separation Techniques
S. Iwai、Shōji Tanaka、K. Fujinuma 等 6 位作者2002-01-16Physical Review Letters
Ultrafast optical switching from an ionic ( I) to a neutral ( N) state in TTF-CA was observed in femtosecond reflection spectroscopy. Charge transfer excitation in the I phase produces N donor ( D0) acceptor ( A0) strings within 2 ps. These initial N states decay with a lifetime of 300 ps at 4 K, but rather multiply l…
Organic and Molecular Conductors ResearchElectron Spin Resonance StudiesMagnetism in coordination complexes
Tomás S. Grigera、Andrea Cavagna、Irene Giardina 等 4 位作者2002-01-16Physical Review Letters
We numerically study the potential energy landscape of a fragile glassy system and find that the dynamic crossover corresponding to the glass transition is actually the effect of an underlying geometric transition caused by the vanishing of the instability index of saddle points of the potential energy. Furthermore, w…
Material Dynamics and PropertiesGlass properties and applicationsTheoretical and Computational Physics
Mark Lundstrom2002-01-16Measurement Science and Technology
This book presents an introduction to the theory of electronic transport in the solid state. The author starts with a reminder of the quantum theory of condensed matter and then concentrates on carrier transport itself. A wide range of subtopics is touched upon in different chapters, e.g. transport in bulk samples and…
Electron and X-Ray Spectroscopy TechniquesAdvanced Physical and Chemical Molecular Interactions
Antti Rahtu、Mikko Ritala2002-01-16Chemical Vapor Deposition
Reaction mechanisms between titanium isopropoxide and deuterated water in the atomic layer deposition (ALD) of TiO2 at 150–350 °C were studied using a quartz crystal microbalance (QCM) and a quadrupole mass spectrometer (QMS). The temperature had no marked effect on the total amount of the main gaseous by-product (CH3…
Semiconductor materials and devicesCatalytic Processes in Materials ScienceElectronic and Structural Properties of Oxides
P. Durän、F. Capel、J. Tartaj 等 4 位作者2002-01-16Advanced Materials
Fully dense doped-ZnO varistors with sub- micrometer grain size (see Figure for a TEM image) can be fabricated by a strategic two-stage, one-cycle, thermal processing method at temperatures as low as 825 °C. The nonlinear coefficients α of such fully dense varistors are as high as 270, which is more than one order of…
Thin-Film Transistor TechnologiesTransition Metal Oxide NanomaterialsZnO doping and properties
R. Mark Bradley2002-01-16arXiv
Due to the effects of surface electromigration, waves can propagate over the free surface of a current-carrying metallic or semiconducting film of thickness h_0. In this paper, waves of finite amplitude, and slow modulations of these waves, are studied. Periodic wave trains of finite amplitude are found, as well as th…
Materials Sciencenlin.PS
Sergei F. Mingaleev、Yuri S. Kivshar2002-01-16arXiv
We study the light transmission in two-dimensional photonic crystal waveguides with embedded nonlinear defects. First, we derive the effective discrete equations with long-range interaction for describing the waveguide modes, and demonstrate that they provide a highly accurate generalization of the familiar tight-bind…
cond-mat.dis-nnMaterials Science
L. Bellon、S. Ciliberto、C. Laroche2002-01-16arXiv
A new kind of memory effect on low frequency dielectric measurements on plexiglass (PMMA) is described. These measurements show that cooling and heating the sample at constant rate give an hysteretic dependence on temperature of the dielectric constant $ε$. A temporary stop of cooling produces a downward relaxation of…
Materials Sciencecond-mat.stat-mech
Z. Neda、K. -t. Leung、L. Jozsa 等 4 位作者2002-01-16arXiv
We investigate the formation of spiral crack patterns during the desiccation of thin layers of precipitates in contact with a substrate. This symmetry-breaking fracturing mode is found to arise naturally not from torsion forces, but from a propagating stress front induced by the fold-up of the fragments. We model thei…
Materials ScienceSoft Condensed Matter
H. Troadec、F. Radjai、S. Roux 等 4 位作者2002-01-16arXiv
We propose a new method to characterize the geometrical texture of a granular packing at the particle scale including the steric hindrance effect. This method is based on the assumption of a maximum disorder (entropy) compatible both with strain-induced anisotropy of the contact network and steric exclusions. We show…
Materials Science
K. Capelle、G. Vignale2002-01-16arXiv
Current-carrying and superconducting systems can be treated within density-functional theory if suitable additional density variables (the current density and the superconducting order parameter, respectively) are included in the density-functional formalism. Here we show that the corresponding conjugate potentials (v…
Materials ScienceSuperconductivityStrongly Correlated Electrons
Parthapratim Biswas2002-01-16arXiv
We present an O(N) algorithm to study the vibrational properties of amorphous silicon within the framework of tight-binding approach. The dynamical matrix elements have been evaluated numerically in the harmonic approximation exploiting the short-range nature of the density matrix to calculate the vibrational density…
Materials Sciencecond-mat.dis-nn
W. N. Kang、Hyeong-Jin Kim、Eun-Mi Choi 等 7 位作者2002-01-16arXiv
We have measured the longitudinal resistivity and the Hall resistivity in the ab-plane of highly c-axis-oriented MgB2 thin films. In the normal state, the Hall coefficient (R_H) behaves as R_H ~ T with increasing temperature (T) up to 130 K and then deviates from that linear T-dependence at higher temperatures. The T^…
SuperconductivityMaterials Science
Tomasz Dietl2002-01-16arXiv
Rapid development of information technologies originates from the exponential increase in the density of information that can be processed, stored, and transfer by the unit area of relevant devices. There is, however, a growing amount of evidences that the progress achieved in this way approaches its limits. Various n…
Materials ScienceStrongly Correlated Electrons
Taolin Sun、Juan M. Garcés2002-01-16Advanced Materials
A novel in-situ polymerization approach has been used to manufacture polyolefin–clay nanocomposites (see Figure) with amazingly enhanced performance. The nanocomposites demonstrate reduced thermal expansion coefficients, improved melt flow strengths, increased heat-distortion temperatures, and lowered gas diffusion co…
biodegradable polymer synthesis and propertiesPolymer crystallization and propertiesPolymer Nanocomposites and Properties
Anna Carlmark、Eva Malmström2002-01-16OpenAlex
Cellulose fibers have been successfully grafted with poly(methyl acrylate) using atom transfer radical polymerization, mediated by Me6-TREN and Cu(I)Br at ambient temperature. The initially hydrophilic cellulose was first modified by reacting the hydrozyl groups with 2-bromoisobutyryl bromide whereupon methyl acrylate…
Surface Modification and SuperhydrophobicityElectrospun Nanofibers in Biomedical ApplicationsAdvanced Cellulose Research Studies