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 mechanism of copper chemical vapor deposition from Cu(II)bis-hexafluoroacetylacetonate [Cu(hfac)2] and 1,5-cyclooctadiene-Cu(I)-hexafluoroacetylacetonate (COD-Cu-hfac) has been determined. The results explain the different processing conditions required for deposition from the precursors. Both molecules react at r…
Epitaxial BaTiO3 thin films were grown in situ on (100) LaAlO3 by low-pressure organometallic chemical vapor deposition using the precursors Ba (hexafluoroacetylacetonate)2 (tetraglyme) and titanium tetraisopropoxide. The phase composition and epitaxial quality were sensitive to the reactant partial pressures and grow…
A series of rare-earth iron carbides were prepared by heat treatment of R2Fe17 compounds in methane. The nominal composition of these carbides is R2Fe17Cx, x∼2.5. The carbides retain the original Th2Zn17 or Th2Ni17 structure with a 6.5% volume expansion over the carbon-free unit cell. For Sm2Fe17C2.5, the Curie temper…
Studying the dynamic structure factor of polybutadiene in the first valley of S(Q) we observed a decoupling of microscopic and macroscopic time scales about 40\ifmmode^\circ\else\textdegree\fi{} above ${\mathit{T}}_{\mathit{g}}$. At higher temperatures the time scale set by the viscosity scales with the microscopic sc…
The ordering in thin films of symmetric diblock copolymers has been studied by neutron reflectivity as a function of temperature and film thickness. Exponentially damped oscillatory variations in the concentration are shown to propagate into the specimens from both surfaces with decay lengths increasing with decreasin…
The discovery of luminescence in electrochemically etched porous silicon is an extremely important scientific breakthrough with enormous technological implications. It opens the door for silicon, the most important microelectronic material, as a possible material for optoelectronics applications. Our result, a correla…
Dichroism and birefringence are shown to be optically induced and erased in high-glass-transition azoaromatic polymers. The resulting polarization information is easily detected and exhibits long-term stability. This optically induced reorientation of the azoaromatic molecules will have wide applications in image reco…
Diffusion of oxygen atoms into diamond can be introduced by CrO3 treatment followed by an exposure to a hydrogen plasma. From characterization using Rutherford backscattering spectrometry, it is found that the depth distribution of the doped oxygen in the diamond is homogeneous from the surface where its concentration…
Abstract The copolymerization of acrylamide (AM) with sodium allylsulfonate (SAS) was studied. The copolymerization rate equation was determined, R p = K [KPS] 0.70 [AM] 1.60 [SAS] −0.60 . The copolymeric composition obtained by nitrogen and sulfur elemental analysis, and 1 H‐NMR method. The reactivity ratios were cal…
Abstract Thermal behavior of fluorine‐containing bismaleimides was investigated by differential scanning calorimetry and the effects of introducing fluorine groups on thermal behavior and properties of cured products were discussed. The melting point was lower and the polymerization temperature was higher with increas…
Abstract The aging of five thick‐walled natural rubber compounds has been studied by computed X‐ray tomography scanning and crosslink density measurements. The compounds were compouded as ordinary carbon‐black‐filled rubbers with sulfur and peroxide as curing agents. The rubber samples were aged in air at 70, 100, and…
Abstract Plasma polymerization of disiloxanes containing various functional groups—hexamethyldisiloxane (HMDSO), tetramethyl‐1,3‐bis(chloromethyl)‐disiloxane (CMDSO), tetramethyl‐1,3‐bis(hydroxylbutyl)‐disiloxane (HBDSO), and tetramethyl‐1,3‐bis(amino propyl)‐disiloxane (APDSO)— was carried out using an inductively co…
Abstract The polymerization of N ‐vinylcarbazole initiated with NO 2 and SO 2 in dichloroethane has been studied. The kinetics of polymerization were followed gravimetrically. The Polymerization is fast with NO 2 but a relatively slow rate was obtained with SO 2 . The polymerization with these gases appears to be init…
A procedure for generating colloidal suspensions of Si that exhibit luminescence, attributed to quantum confinement effects, is described. Samples of n- or p-type Si that have been electrochemically etched to form porous Si can be ultrasonically dispersed into methylene chloride, acetonitrile, methanol, toluene, or wa…
The performance is reported of a programmable, two-level, phase-only device based on a commercially available 128 × 128 pixellated, ferroelectric liquid crystal spatial light modulator. Near diffraction limited performance is achieved and results for a Dammann grating are comparable to those obtainable with fixed comp…
In the present paper nonlinear evolution of disturbances at the meniscus between parallel circular plates is simulated by a boundary element method. To simulate accurately such a nonlinear phenomenon, the thickness of liquid remaining on the plates is obtained numerically against the low capillary number Ca<1.0, which…
For military and aerospace applications, temperature is one of the more important environmental influences on optical systems. For example, some systems are required to operate over a temperature range of -30°C to 50°C. However, little has been reported in the open literature on the effects of temperature on diffracti…
from EB (O-H*) = ΔEP-EA (H+). The electron affinity of the H+ ion EA (H+) was estimated as the same of value of ionization potential of the H atom, IP (H) = 13.598eV. ΔEP is the difference of EP among the structures of II-VI; ΔEP = EP (II)-EP (III, IV, V, VI). The values (in kJ/mol) obtained of EB (O-H*) (for the stru…
In order to investigate the magnetic contributions of each iron site of Nd2Fe14B, the magnetic properties of Nd2(Fe1-xMx)14B (M=Al, Ti, V, Cr, Mn, Co, Ni, Cu, Zn, Ga, Pt) were measured, and the preferential occupation of Fe sites by M atoms was studied by Mossbauer spectroscopy. The Mossbauer spectra were analyzed by…
The molar specific heats of binary solid solutions Kr–n14N2 (n = 0.25, 0.7, 1 mol. %) and ternary solid solutions Kr–0.25%14N2 – x Ar (x = 2, 9, 24.4 mol. %) are measured in the temperature interval from 0.5 K to 6–9 K. It is established that the values and temperature dependence of the specific heat ΔC associated wit…