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 line energy associated with the triple phase contact line is a function of local surface defects (chemical and topographical); however, it can still be calculated from the advancing and receding contact angles to which those defects give rise. In this study an expression for the line energy associated with the tri…
A progressive reduction of tetragonal distortion, heat of transition, Curie temperature, and relative dielectric constant has been observed on dense ${\mathrm{BaTiO}}_{3}$ ceramics with grain size decreasing from 1200 to $50\phantom{\rule{0.3em}{0ex}}\mathrm{nm}$. The correlations between grain size, extent of tetrago…
The plastic behavior of crystalline materials is mainly controlled by the nucleation and motion of lattice dislocations. We report in situ dynamic transmission electron microscope observations of nanocrystalline nickel films with an average grain size of about 10 nanometers, which show that grain boundary-mediated pro…
Tellurite glasses are important for nonlinear optical applications. We report measurements of the spectrum of empty states in tellurium oxide, using the method of electron energy-loss spectroscopy based on excitations from inner shells. This near-edge structure is completely dominated near the threshold by core-hole e…
A Landau theory for surface enhanced ordering in free-standing smectic-A films is described, based on a generalization of de Gennes's "presmectic" model to systems which undergo a first-order smectic-isotropic transition in bulk. As found in related work on phase transitions in thin films, the system exhibits three ph…
Dry reverse micelles of AOT in isooctane spontaneously undergo a microstructural transition to an organogel upon the addition of a phenolic dopant, p-chlorophenol. This microstructural evolution has been studied through a combination of light scattering, small-angle neutron scattering (SANS), NMR, and rheology. Severa…
Accurate and precise determinations of thermodynamic parameters of binding are important steps toward understanding many biological mechanisms. Here, a multi-method approach to binding analysis is applied and a detailed error analysis is introduced. Using this approach, the binding thermodynamics and kinetics of the r…
First and second generations of 1 → (2 + 1) C-branched metallodendrimers were prepared employing terpyridine−Ru II −terpyridine connectivity. Each surface dendron is comprised of a terpyridinyl (focal group), a diester (capable of easy hydrolysis), and a terminal adamantyl moiety (for encapsulation). Internal incorpor…
Abstract By using in situ neutron reflectivity, we measured the swelling behavior of two types of polymer brushes, deuterated polystyrene with a trichlorosilane end group and deuterated polystyrene‐ block ‐poly(4‐vinylpyridine) block copolymer, in supercritical carbon dioxide (scCO 2 ). The measurements were conducted…
We employ density functional calculations to study properties of $\mathrm{Si}$ nanocrystals after backbond oxidation in comparison to the ones passivated with hydrogen or hydroxyl. Structural parameters, pair excitation energies, quasiparticle gaps, and electrostatic potentials vary significantly in dependence on degr…
Abstract A possible approach to improve the blood compatibility of poly(ether urethane)s (PU) involves the covalent attachment of key molecules on its surface. The purpose of the present study was to design and synthesise a novel non‐thrombogenic biomaterial by modifying the surface of the PU with a zwitterionic monom…
Ny6-Ny6,10 and Ny6-Ny4,6 copolyamides prepared by a facile melt mixing at 290−310 °C of carboxyl terminated Nylon6 (Ny6-COOH) with Ny6,10 or Ny4,6, were characterized by MALDI, 13 C NMR, and DSC analysis. The results, from one side show how facile is the high yield synthesis of random copolyamides via the melt mixing…
Abstract Hybrid density functional theory (HDFT) and post Hartree–Fock CCSD(T) methods are applied to elucidate the binding energies and the optimized MO distances of transition metal oxides: MO (M = Cr, Mn, Fe, Co, Ni, Cu). The HDFT method can reproduce the CCSD(T) results, in agreement with the experimental ones. T…
Abstract Polymer molecules at solid or fluid interfaces have an enormous spectrum of applications in a wide variety of technologies as lubricants, adhesion modifiers, and protective surface coatings. Because polymer brushes have great potential to be used in such applications, there is a need to determine their struct…
Abstract Crosslinked polyethylene (XLPE) is progressively replacing other types of polyethylene in electric cable insulation because of its combination of better mechanical and thermal performance and good dielectric properties. Besides its influence on the mechanical and thermal properties, the morphology plays a ver…
The successful and practical application of shape memory alloy (SMA) torque tube actuators has frequently been hindered by an incomplete understanding of the effects of manufacturing and processing variables, particularly when working with large-scale systems producing high force and large displacements. Recently the…
Ab initio calculations of the magnetic shape-memory alloy ${\mathrm{Ni}}_{50}{\mathrm{Mn}}_{x}{\mathrm{Al}}_{50\ensuremath{-}x}$ with $0\ensuremath{\leqslant}x\ensuremath{\leqslant}50$ were carried out using density functional theory and PAW potentials. The alloy is ferromagnetic in the range from 14 to 31 at.$%$ $\ma…
Sequential surface chemical reactions of poly(acrylic acid- co - N -isopropylacrylamide) [poly(AAc- co -NIPAAm)] with AAc contents of 5, 10, and 15 mol %, of which carboxyl groups were previously activated by 1-ethyl-3-(3-(dimethylamino)propyl)carbodiimide hydrochloride (EDC), plus poly(vinylamine hydrochloride) throu…
Abstract A simple technique employing differential scanning calorimetry (DSC) to investigate the molecular structure of ethylene copolymers is presented in this paper. Three commercial Ziegler–Natta catalysed linear low density polyethylenes (LLDPE) and a commercial single‐site catalysed very low density polyethylene…
Abstract Two series of mixed phthalocyaninato and porphyrinato rare earth( III ) triple‐decker complexes [M 2 (Pc)(TClPP) 2 ] ( 1a − 10a ) and [M 2 (Pc) 2 (TClPP)] ( 1b − 11b ) [M = Y, La−Er except Ce and Pm; Pc = phthalocyaninate; TClPP = tetrakis(4‐chlorophenyl)porphyrinate] have been prepared by treating the half‐s…