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。
Ce3+ ion doped olgite mineral samples, Na(Sr, Ba)PO4, were prepared by a high temperature solid-state reaction. The sample was investigated through x-ray powder diffraction, FT-IR and FT-Raman spectra measurements. The optical properties under vacuum ultraviolet (VUV) synchrotron radiation and ultraviolet (UV) irradia…
Nongraphitising ablation of the surface of a natural diamond single crystal irradiated by nanosecond UV laser pulses is studied experimentally. For laser fluences below the diamond graphitisation threshold, extremely low diamond etching rates (less than 1nm/1000 pulses) are obtained and the term nanoablation is used j…
Effects of strontium doping on ionic conductivity of Sm 2 O 3 -doped ceria (samarium-doped ceria (SDC)) were investigated. The distribution and average radius of oxygen vacancies by co-doping divalent and trivalent cations were calculated from a hard-sphere model. Experimental results exhibit that the best conductivit…
Here we report a systematic study of magnetic, electronic and microstructural properties of Cu-doped and Cu and Al codoped ZnO thin films, grown epitaxially on a (0 0 0 1) sapphire substrate by the pulsed laser deposition technique. The films were annealed in oxygen at high temperature (600 °C) and their properties we…
High-speed imaging was used to capture the effect of surface-active solutes on the behavior of acoustic bubbles, generated in a microspace using low-frequency ultrasound (60 kHz). By confining cavitation within a microspace, the dynamic behavior of bubbles, such as bubble coalescence, clustering, and fragmentation, co…
A new paper in this issue discusses some of the considerations for fabrication of biosensor devices in the porous silicon material system. The results focus on optical detection of protease activity on specific substrates that have been immobilized in a porous silicon matrix. Solutions to important limitations of poro…
The stabilities and atomic geometries of graphene multivacancies are studied using a first-principles calculation. We find that the atomic relaxation allows the system to have pentagons in vacancies and that this pentagon formation stabilizes the defects considerably. It is concluded that the magic numbers of the mult…
A mild, four-step purification procedure using NaOH reflux, HCl wash, and oxidation by 4 mol % molecular oxygen at 500 degrees C was developed to purify single-walled carbon nanotubes (SWCNTs) with narrow semiconducting (n,m) distribution produced from cobalt-incorporated MCM-41 (Co-MCM-41) in order to obtain bulk low…
La doped SrBi 2 Nb 2 O 9 (LSBN) ferroelectric ceramics prepared by the solid-state reaction technique exhibit composition-dependent remanent polarization. X-ray diffraction (XRD) and Raman scattering have been carried out to investigate the effects of La doping on the crystal structure of SrBi 2 Nb 2 O 9 (SBN). The XR…
Vanadium pentoxide (V 2 O 5 ) thin films were deposited onto Si (1 0 0) substrates using dc and pulsed dc reactive magnetron sputtering at 26, 100 and 300 °C to investigate the influence of substrate temperature and sputtering mode on their structural and mechanical properties. X-ray diffraction, Raman spectroscopy an…
The field-dependent photocurrent spectrum of individual carbon nanotubes is measured using a displacement photocurrent technique. A series of peaks is observed in the photocurrent corresponding to both excitonic and free carrier transitions. The photocurrent peak corresponding to the ground state exciton increases by…
Mild photoactivation of new BINOL-amino acid and -amino ester conjugates (BINOLAMs) yielded alkylating and DNA cross-linking agents with high photoefficiency and superior cytotoxicity. Detection of the transient electrophile, by laser flash photolysis (LFP), suggests that BINOL-quinone methides (QMs) are key intermedi…
The influence of lattice water in the magnetic properties of spin-crossover [Fe(bpp)2]X2.nH2O salts [bpp = 2,6-bis(pyrazol-3-yl)pyridine] is well-documented. In most cases, it stabilizes the low-spin state compared to the anhydrous compound. In other cases, it is rather the contrary. Unraveling this mystery implies th…
The thin films of Cd1-x Zn x S (x = 0, 0.2, 0.4, 0.6, 0.8 and 1) have been prepared by the vacuum evaporation method using a mechanically alloyed mixture of CdS and ZnS. The structural, optical and electrical properties have been investigated through the X-ray diffractometer, spectrophotometer and Keithley electromete…
Aluminum hydride, AlH 3, is the most well-known alane. Though thermodynamically unstable under ambient conditions, it is easily prepared in a metastable state that will undergo controlled thermal decomposition to produce H 2 and Al at around 100 °C. AlH 3 contains 10.1 wt % hydrogen and has a density of 1.48 g/mL and…
Density functional theory (DFT) was used to study the coadsorption of O 2 and H 2 or H on Au(111) and Au(100) and on free pyramidal clusters (Au 25 and Au 29 ) observed on titania- and ceria-based catalysts. For the adsorption of isolated O 2, no significant interaction was obtained between the flat metal surfaces and…
We show that modulation instability may occur even in the normal group-velocity dispersion regime, or in the case of no group-velocity dispersion in metamaterials with a nonlinear electric polarization. The physical origin of the modulation instability is the additional second-order nonlinear dispersion effect resulte…
${\mathrm{Pr}}_{1\ensuremath{-}x}{\mathrm{Ca}}_{x}{\mathrm{MnO}}_{3}$ in the doping range between $0.3<x<0.5$ represent an extremely interesting manganite system for the study of the interplay of different kinds of ordering (charge, orbital, lattice, and spin). While there is consensus that a charge- and orbital…
We report a first-principles investigation of the energetics and structure properties of $\mathrm{Ce}{\mathrm{O}}_{1.50}$ in the hexagonal $({\mathrm{La}}_{2}{\mathrm{O}}_{3})$, cubic (bixbyite), and monoclinic structures. Our calculations are based on density functional theory within the local density approximation (…
Chiral single-walled carbon nanotubes (SWNTs) have left- and right-handed helical structures (M and P, respectively, according to the IUPAC nomenclature). In this report, optically active SWNTs were obtained through preferential extraction of (M)- or (P)-SWNTs with 2,6-pyridylene-bridged chiral diporphyrins 1. In the…