Materials Literature
按标题、摘要、年份、主题和来源检索公开元数据。结果保留作者、摘要、分类与原始来源链接。
The morphology of naphthalene and anthracene crystals has been studied both theoretically and experimentally. A connected net analysis shows that the faces {011} and {21̄1̄} contain a pair of symmetry-related connected nets giving rise to a new phenomenon called symmetry roughening. Experimentally the {011} and {21̄1̄…
A disperse red 19-containing semicrystalline azopolymer (pDR19T) with phenylene diacrylate (PD) groups within the main chain has been studied by polarization modulation and two-dimensional correlation infrared spectroscopy. The time dependence of the orientation function of azobenzene and PD groups has been followed d…
The isothermal volume contractions obtained on physically aging a sample of poly(vinyl acetate) at three temperatures below the glass transition were measured dilatometrically. These were compared with enthalpy aging data for the same polymer sample on the basis of characteristic relaxation times by fitting both types…
A determination of the viability of an endospore detection technique using terbium dipicolinate photoluminescence in the presence of other chemical and biological materials was performed. The compounds and organisms examined, possible environmental constituents, covered three broad categories: organic compounds, inorg…
A precise structural study by wide-angle X-ray scattering (WAXS) has been carried out on two spin transition materials: [Fe(Htrz) 2 (trz)](BF 4 ) ( 1 ) and [Fe(NH 2 trz) 3 ](NO 3 ) 2 ( 2 ), with Htrz = 1,2,4-4H-triazole, trz = 1,2,4-triazolato, and NH 2 trz = 4-amino-1,2,4-triazole, both at room temperature in the low…
ADVERTISEMENT RETURN TO ISSUEPREVNoteNEXTKinetic Constraints on the Development of Surface Microstructure in SBS Thin FilmsGinam Kim and Matthew LiberaView Author Information Department of Materials Science and Engineering, Stevens Institute of Technology, Hoboken, New Jersey 07030 Cite this: Macromolecules 1998, 31,…
Reaction of [Cr V (N)(salen)]·CH 3 NO 2 and [Mn V (N)(salen)] in dimethylformamide or a methanol/water mixture with an aqueous solution of NaCN and CsCl or [N(CH 3 ) 4 ]Cl at elevated temperatures affords in good yields, respectively, yellow microcrystalline compounds of Cs 2 Na[Cr V (N)(CN) 5 ] ( 1 ); [N(CH 3 ) 4 ] 2…
We consider an emulsion whose droplets contain a trapped species (insoluble in the continuous phase) and study the emulsion's stability against coarsening via Lifshitz−Slyozov dynamics (Ostwald ripening). Extending an earlier treatment by Kabalnov et al. ( Colloids Surf., 1987, 24, 19−32), we derive a general conditio…
Magnetotransport properties of the Mn(IV)-rich perovskites Ca1-xLnxMnO3 and Ca1-xThxMnO3 (0 ≤ x ≤ 0.20) have been systematically investigated. Among the different factors governing their colossal magnetoresistance (CMR), we demonstrate that the electron concentration is the predominant one by comparing the effects of…
Mesoporous silicas with variable pore size and architecture were made by using aqueous solutions of block copolymers with one polyelectrolyte block as templates in a sol-gel process. Pore size and connectivity follow the structure of the block copolymer micelles or mesophases, i.e., the resulting silica gel network is…
We study two closely related, nonlinear models of a viscoplastic solid. These models capture essential features of plasticity over a wide range of strain rates and applied stresses. They exhibit inelastic strain relaxation and steady flow above a well defined yield stress. In this paper, we describe a first step in ex…
Small-angle X-ray scattering (SAXS), optical microscopy and differential scanning calorimetry were used to establish relationships between crystallization, microstructure, and equilibrium melting temperature ( T m 0 ) for random copolymers of poly( l -lactide- co - meso -lactide). T m 0 s derived using the Gibbs−Thoms…
A liquid drop on a tilted plate can remain at rest, provided that an hysteresis for the contact angle exists. We examine in this paper the case of small contact angle hysteresis, for which the drops are found to be nearly spherical caps, despite the slope. We derive in particular the condition (both in angle and hyste…
The shape evolution of small heated metal particles is dominated by surface diffusion. When two spheres touch, they will thus merge into one, as they continually decrease their surface area. Focusing on the asymptotic behavior when the radius $r$ of the neck joining the two spheres is still small, it is found that the…
A novel multi-scale seamless model of brittle-crack propagation is proposed and applied to the simulation of fracture growth in a two-dimensional Ag plate with macroscopic dimensions. The model represents the crack propagation at the macroscopic scale as the drift-diffusion motion of the crack tip alone. The diffusive…
We have investigated the possibility afforded by epitaxial ferroelectric oxide thin films to control and image locally the polarization field of ferroelectrics over large areas with submicron resolution, using the metallic tip of an atomic force microscope as a mobile top electrode and local probe of the ferroelectric…
A two-dimensional thermodynamic model was developed to account for the observed difficulty in the fabrication of epitaxial Pb(Zr,Ti)O3 (PZT) thin films in which tetragonal and rhombohedral phases coexist. The thermodynamic formalism based on the Landau–Devonshire’s phenomenological theory predicts the enhanced thermod…
Our extended electrical conductivity and viscosity measurements have revealed a general fractional power relation between them in pure and mixed ionic melts: $\ensuremath{\sigma}T\ensuremath{\propto}(T/\ensuremath{\eta}{)}^{m}$ ( $m\phantom{\rule{0ex}{0ex}}=\phantom{\rule{0ex}{0ex}}0.8\ifmmode\pm\else\textpm\fi{}0.1$…
Measurements of the temperature dependence of the thermoelectric power and the resistivity of ${}^{18}\mathrm{O}{/}^{16}\mathrm{O}$ isotope-exchanged $({\mathrm{La}}_{1\ensuremath{-}x}{\mathrm{Nd}}_{x}{)}_{0.7}{\mathrm{Ca}}_{0.3}{\mathrm{MnO}}_{3}$ samples have confirmed the existence of vibronic electronic states bel…
We report STM-induced desorption of H from $\mathrm{Si}\left(100\right)\ensuremath{-}\mathrm{H}\left(2\ifmmode\times\else\texttimes\fi{}1\right)$ at negative sample bias. The desorption rate exhibits a power-law dependence on current and a maximum desorption rate at $\ensuremath{-}7\mathrm{V}$. The desorption is expla…