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。
We have discovered a rare example of a cationically charged inorganic material. The layered structure is an example outside the extensively studied isostructural set of anionic clays/layered double hydroxides and our previously reported lead fluoride nitrate. For the present compound, the antimony oxide hydroxide laye…
Abstract Poly(ethylene oxide) (PEO) based nanocomposites were prepared by the dispersion of multiwall carbon nanotubes (MWCNTs) in aqueous solution. MWCNTs were added up to 4 wt % of the PEO matrix. The dynamic viscoelastic behavior of the PEO/MWCNT nanocomposites was assessed with a strain‐controlled parallel‐plate r…
Abstract Untreated and alkali‐treated fibers from tamarind fruits were analyzed with Fourier transform infrared, chemical, X‐ray, and thermogravimetric methods. The morphology of the fibers before and after the alkali treatment was studied with scanning electron microscopy. The tensile properties of these fibers befor…
Glassy states of three pharmaceuticals, acetaminophen, griseofulvin, and nifedipine, and an acetaminophen-aspirin (1:1 mol) alloy were made by slow cooling of the melt and studied by calorimetry. Measurements were performed by cooling and heating at significantly slow rates of 20 K/h, which were comparable to the rate…
Scanning tunneling microscopy has been used to study the formation of a Bi monolayer deposited on the fivefold surface of $i{\text{-Al}}_{70}{\text{Pd}}_{21}{\text{Mn}}_{9}$. Upon deposition of low submonolayer coverages, the nucleation of pentagonal clusters of Bi adatoms of edge length $4.9\text{ }\text{\AA{}}$ is o…
Molecular simulations are used to shed light on an ongoing controversy over where gases adsorb on single walled carbon nanotube bundles. We have performed simulations using models of carbon nanotube bundles composed of tubes of all the same diameter (homogeneous) and tubes of different diameters (heterogeneous). Simul…
Different polymeric materials have been prepared from the organogels formed by a polymerizable methacrylic mixture (methyl methacrylate/ethylene glycol dimethacrylate, 1:1, w/w) and the macrocyclic pseudopeptide 1. The use of (2,4,6-trimethylbenzoyl)diphenylphosphine oxide as a very efficient radical initiator allows…
A new route to bilanes and porphyrins bearing four distinct meso substituents has been studied to elucidate the scope and gain entry to previously inaccessible compounds. The route entails (i) synthesis of a 1-bromo-19-acylbilane by acid-catalyzed condensation of a 1-acyldipyrromethane and a 9-bromodipyrromethane-1-ca…
A process to fabricate porous silicon Bragg reflectors patterned on a micrometer lateral scale over wafer areas of several square centimeters is described. This process is based on a new type of projection system involving a megavolt accelerator and a quadrupole lens system to project a uniform distribution of MeV ion…
The magnetocaloric effect (MCE) in Mn site Si substituted La2/3Ca1/3Mn1?xSixO3 (x = 0.05, 0.10, 0.15 and 0.20) was investigated. All the samples have a single paramagnetic to ferromagnetic transition and show a large magnetic entropy change (??SM) in the vicinity of the Curie temperature (TC). With the increases in Si…
This study compared the vertical misfit of 3-unit implant-supported nickel-chromium (Ni-Cr) and cobalt-chromium (Co-Cr) alloy and commercially pure titanium (cpTi) frameworks after casting as 1 piece, after sectioning and laser welding, and after simulated porcelain firings. The results on the tightened side showed no…
The origins for abrupt adhesion loss at a critical relative humidity (RH) for polymeric adhesives bonded to inorganic surfaces have been explored using a model poly(methyl methacrylate) (PMMA) film on glass. The interfacial and bulk water concentrations within the polymer film as a function of D 2O partial pressure we…
Abstract α‐ and β‐cobalt hydroxyde thin films were synthesized by cathodic electrodeposition on transparent conductive oxide (TCO) substrates, at 60 °C and 95 °C, respectively, using a very low concentration of Co(NO 3 ) 2 and an alkali nitrate supporting electrolyte. Localized cathodic electrochemical generation of h…
The Raman spectra of the ceramics PLZT x/40/60 have been measured in the temperature range 20‐800 K. An assignment of the Raman modes is presented using the results of the effective medium approximation for the IR data. Factor-group analysis is presented for the case of off-site position of cations or unit cell doubli…
A series of samples with nominal chemical formulas La 2− x Ce x CaB 10 O 19 and La 2 Ca 1−2 x Ce x Na x B 10 O 19 were prepared by a solid state reaction route at high temperature. Their luminescence properties were investigated by the steady state excitation and emission spectra in the VUV−vis range, the luminescence…
Nephrogenic systemic fibrosis (NSF) is a fibrosing disorder that may develop in patients who have advanced reduction in renal function. A causal relation between gadolinium (Gd(3+))-based contrast agents (Gd-CA) and NSF is probable and is supported by the accumulating data in the literature. From those data, the preva…
Abstract The objective of this study was to investigate the electrospun nano‐scaled glass fiber reinforcement of 2,2′‐bis[4‐(methacryloxypropoxy)‐phenyl]‐propane/triethylene glycol dimethacrylate (Bis‐GMA/TEGDMA) dental composites. The hypothesis was that incorporation of the surface‐silanized electrospun nano‐scaled…
Single-crystal VO 2 nanowires were synthesized using atmospheric-pressure and physical vapor deposition and outfitted with electrodes for current−voltage measurements. The Mott insulator-to-metal transition temperatures of several nanowires with varying lateral dimensions were determined by measuring the voltage value…
The macroscopic properties of a glass are continually relaxing toward their equilibrium supercooled liquid values. Experimentally, the shape of the relaxation function in a glass is known to depend on the fragility of the supercooled liquid. In this paper, we investigate the impact of fragility on the relaxation behav…
The effects of thermal treatment in the range 25−200 °C of the Zn/Al (ratio 2:1) synthetic hydrotalcites having chloride and carbonate as interlayer anions, of formula [Zn 0.65 Al 0.35 (OH) 2 ]Cl 0.35 ·0.35H 2 O ( I ) and [Zn 0.65 Al 0.35 (OH) 2 ](CO 3 ) 0.175 ·0.69H 2 O ( II ), were studied using an integrated X-ray…