Materials Literature
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This paper focuses on effects of roughness on wettability. According to Wenzel's equation, the transition of theoretical wetting contact angles is 90°, whereas many experimental results have indicated that such a transition takes place at contact angles smaller than 90°. A new model of wetting on roughness surface is…
Abstract L-aspartic acid was intercalated into layered double hydroxides by coprecipitation. Two types of well crystallized material were obtained and were characterized by powder X-ray diffraction, Fourier transform infrared spectroscopy, thermogravimetry, differential thermal analysis and polarimetry. Schematic mode…
Mullite–boron nitride (BN) composite with high strength, low Young's modulus, and highly improved strain tolerance was prepared by reactive hot pressing (RHP) using aluminum borates (9Al 2 O 3 ·2B 2 O 3 and 2Al 2 O 3 ·B 2 O 3 ) and silicon nitride as starting materials. Compared with the monolithic mullite, the compos…
In the standard specification of ac dielectric-characteristic measurements of insulating materials, test voltage is prescribed as "approximately sinusoidal" when the highest acceptable deviation of the HV waveform, from the correct sinusoidal shape, is limited to a /spl plusmn/5% tolerance range of the crest factor va…
Abstract The corrosion failure behavior of marine steel is affected by stress, which exists in offshore structures at sea‐mud region. The sulfate reducing bacteria (SRB) in the sea‐mud made the steel more sensitive to stress corrosion cracking (SCC) and weaken the corrosion fatigue endurance. In this paper, a kind of…
Dielectric and DSC methods were used to study a new fluorinated liquid crystalline compound exhibiting ferroelectric and paraelectric phases as well as an intermediate alpha sub-phase. Two dielectric relaxation processes were revealed in the SmC* phase: a typical Goldstone mode over the whole temperature range and a s…
A fabric is a flexible material that it is highly affected by its own weight, which causes large deflections. The relationship between the bending moment and the curvature is nonlinear. This study presents a model for fabric buckling by considering the flexibility of the fabric as well as its nonlinearity in bending.…
Dynamic vulcanization of a soft grade of thermoplastic natural rubber (TPNR) was carried out using several concentrations of Hexamethylene N, N′ bis (tert-butyl peroxy carbamate) (HBTP). The blends were melt mixed in a Brabender plasticorder. The effectiveness of dynamic vulcanization was investigated using the Braben…
Abstract Preparation and optical characterization of dysprosium gadolinium oxalate (DGO) single crystal is reported. The crystals were grown using silica gel technique, by the controlled reaction of rare earth nitrates with oxalic acid. Crystals were characterized using X‐ray powder diffraction, optical absorption and…
A new structure type (L) is reported for disilicates of the middle and heavy rare earth elements (REE) quenched from 10 GPa, 1600-1700 °C. Crystal data are: triclinic, space group P1̅ , Z = 6; Dy 2 Si 2 O 7 : a = 6.5971(3), b = 6.6504(2), c = 18.0582(6) Å, α = 83.791(2), β = 88.653(2), γ = 88.498(2)°, V = 787.2 Å 3 ,…
Femtosecond pulses of a Cr:forsterite laser are used to study second-and third-harmonic generation in a layer of single-wall carbon nanotubes produced by low-velocity spraying. The harmonic amplitude in our experiments scales as ( I p ) n as a function of the pump intensity I p , with n =2 and 3 for the second and thi…
We propose using zeolite filter in portable processing equipment to separate and recover SF/sub 6/ from SF/sub 6//N/sub 2/ mixtures. Testing of a prototype filter has shown that SF/sub 6/ is completely adsorbed by the filter, and the exhaust gas from the filter is pure N/sub 2/ (i.e., at an undetectable level of SF/su…
Nous avons etudie les relations de phases du sous-systeme Fe 4 . 5 Ni 4 . 5 S 8 -Co 9 S 8 dans le systeme Fe-Ni-Co-S en utilisant les syntheses avec tubes de silice evacues et scelles. Nous avons aussi synthetise des cristaux idiomorphes de la forme de haute temperature de cobalt pentlandite (Co 9 S 8 ) et d'un membre…
This paper describes the synthesis and physical properties of a chiral bent-core liquid crystal containing the chiral non-aromatic central ring system 1,5-anhydro-2-desoxy-D-arabino-hexitol. The preparation involved a stepwise construction of the mesogenic side chains via a selective diesterification of glucal at posi…
A dense alumina‐silicon carbide (Al 2 O 3 –SiC) nanocomposite was synthesized in situ from the reaction of mullite, aluminum, and carbon by reactive hot pressing (RHP). Transmission electron microscopy investigation showed that in situ ‐formed, nanometer‐sized SiC particles were mainly entrapped in the matrix grains,…
Abstract SER(R)S spectra with high signal intensity of Nile Blue A sulfate and 1,1′‐diethyl‐2,2′‐cyanine iodide present in low concentration (≤0.05 µ M ) can be recorded by employing certain silver sols in the absence of any chloride and without highly aggregated particles. The sols have been prepared by reduction of…
The synthesis, catalytic properties, UV-visible spectra and electrochemistry of β-pyrrole brominated porphyrins are summarized in this brief review. The effect of the Br substituents of the porphyrin ring on the redox behavior, and on axial CO or pyridine binding to the porphyrins is also discussed.
Photonic crystals, frequency-selective surfaces, gratings, and many so-called metamaterials are composed of periodic arrangements of objects. Such an arrangement of objects quickly forms a periodic waveguide. In this paper, we investigate a number of properties of the eigenmodes in general periodic waveguides using th…
The output force–strain relationship typical of the performance of Terfenol-D transducers under varied operating conditions is examined to study transducer blocked-force characteristics. The design and construction of a transducer for testing under controlled thermal, magnetic and mechanical load conditions are descri…
Abstract This paper describes a rare occurrence of nontronite associated with sulfide-bearing felsic metavolcanics, providing evidence of colloidal deposition in open spaces as result of a low-temperature water-rock interaction. Microbotryoidal masses of green nontronite with impurities of kaolinite, illite, barite, a…