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 squaraine dye bis(2,4,6-trihydroxyphenyl)squaraine (SqH) was earlier reported to form J-type dimer aggregates in acetonitrile solutions at higher concentrations. Subsequent studies have suggested that concentration-dependent changes in the absorption spectrum of SqH in acetonitrile could be attributed to shifts in…
We employ the distance matrix method to investigate metabasin dynamics in supercooled water. We find that the motion of the system consists in the exploration of a finite region of configuration space (enclosing several distinct local minima), named metabasin, followed by a sharp crossing to a different metabasin. The…
In order to apply ab initio wave-function-based correlation methods to metals, it is desirable to split the calculation into a mean-field part and a correlation part. Whereas the mean-field part (here Hartree-Fock) is performed in the extended periodic system, it is necessary to use for the correlation part local wave…
Airborne clay mineral particles have long atmospheric lifetimes due to their relatively small size. To assess their impact on trace atmospheric gases, we investigated heterogeneous reactions on prototype clay minerals. Diffuse reflectance infrared spectroscopy identified surface-adsorbed products formed from the uptak…
Abstract Poly(tetramethylene oxide)‐based poly(ether ester amide)s with monodisperse tetraamide segments were synthesized. The tetraamide segment was based on adipic acid, terephthalic acid, and hexamethylenediamine. The synthesis method of the copolymers and the influence of the tetraamide concentration, which was va…
Raw, micrometric HiPCO single wall carbon nanotube (SWNT) material was submitted to harsh acid oxidative treatment with a 3:1 H2SO4/HNO3 mixture to give short residues of SWNT (s-SWNT, <200 nm length measured by TEM). s-SWNT was functionalized through the tip carboxylic groups by peptide bonds using 3-mercatopropanami…
Abstract Magnetic composite containing polyaniline (PANI)‐coated LiNi 0.5 Gd 0.08 Fe 1.92 O 4 was synthesized by in situ polymerization of aniline on the surface of LiNi 0.5 Gd 0.08 Fe 1.92 O 4 ferrite particles. The obtained samples were characterized by powder X‐ray diffraction, Fourier transform infrared spectra, U…
Detailed structural and magnetic measurements were performed on nanostructured composite thin films of cobalt ferrite (CoFe2O4-magnetostrictive) dispersed in a barium titanate (BaTiO3-piezoelectric) matrix, with different CoFe2O4 concentrations (ranging from x=20% to x=70%). The films were deposited by laser ablation…
Experimental development of dynamic models for the saturable reactor for HVDC applications was made by taking account of the effects of the eddy-current, the air gap, and the nonlinear magnetisation of the cores of the 3% grain-oriented silicon steels used. The experimentally developed models were confirmed by compari…
The atomic and electronic structures of the BaTiO 3 (110) polar surface were systematically investigated by first-principles density functional theory (DFT) calculations with use of slab models. The relaxations and rumplings of five different (1 × 1) terminations were considered. According to the results of the charge…
Charged and uncharged colloidal systems are known from experiment to display an extremely rich phase behavior, which is ultimately determined by the effective pair potential between particles in solution. As a confirmation, the recent striking observation of an equilibrium cluster phase in charged globular protein sol…
Novel tetraazachlorin (TAC)-fullerene (C60) conjugates (TAC-C60) and their analogues (TAiBC-C60 and TABC-C60 where TAiBC = tetraazaisobacteriochlorin and TABC = tetraazabacteriochlorin) have been synthesized by condensing 1,2-dicyanofullerene (1) and phthalonitrile derivatives (2) in the presence of nickel chloride in…
Dome-shaped gold nanoparticles (with an average diameter of 10.5 nm) are grown on H-terminated Si(100) substrates by simple techniques involving electro- and electroless deposition from a 0.05 mM AuCl3 and 0.1 M NaClO4 solution. XPS depth profiling data (involving Au 4f core-level and valence band spectra) reveal for…
X-ray absorption fine structure (EXAFS) and X-ray absorption near-edge structure (XANES) techniques at both Fe and Co K-edges were used to investigate the formation of CoFe 2 O 4 nanoparticles embedded in a silica aerogel matrix as a function of calcination temperature and CoFe 2 O 4 content. In particular, nanocompos…
Abstract The isothermal crystallization of HDPE/POSS (polyhedral oligomeric silsesquioxane) nanocomposites (POSS content varying from 0.25 to 10 wt %) was studied using differential scanning calorimetry (DSC) technique. The Avrami model could successfully describe the isothermal crystallization behavior of the nanocom…
Abstract Nanocomposites of modified chitosan, carboxymethyl chitosan (CMCh) with hydroxyapatite (HAP) have been prepared by coprecipitation technique. Totally three nanocomposites containing 80/20, 50/50, and 20/80 of HAP/CMCh have been prepared and were characterized by using transmission electron microscopy (TEM), X…
We report measurements of the full intrinsic optical anisotropy of isolated single-wall carbon nanotubes (SWNTs). By combining absorption spectroscopy with transmission ellipsometry and polarization-dependent resonant Raman scattering, we obtain the real and imaginary parts of the SWNT permittivity from aligned semico…
Ordered nanoporous silica films have attracted great interest for their potential use to template nanowires for photovoltaics and thermoelectrics. However, it is crucial to develop films such that an electrode under the nanoporous film is accessible to solution species via facile mass transport through well-defined po…
Twinned zigzag SiC nanoneedles have been synthesized by silicon evaporation onto multiwall carbon nanotubes (MWCNTS) at 1500 °C for 8 h. The product was characterized by X-ray diffraction (XRD), field emission scanning electron microscope (FESEM), and high-resolution electron transmission microscope (HRTEM). The resul…
Anionic ring-opening polymerization and copolymerization of allyl glycidyl ether (AGE), tert -butyl glycidyl ether ( t BuGE), and ethoxyethyl glycidyl ether (EEGE) was performed using potassium 3-phenyl-1-propanol as initiator. The polymers poly(AGE), poly( t BuGE), poly(EEGE) as well as poly(AGE- co - t BuGE), poly(A…