Materials Literature
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Abstract The present work provides a critical review of polymer crystallization studies using SALS; experimental methods, analysis techniques, observations and their relations with respect to other techniques are discussed. Furthermore, the fact that nucleation might be accompanied by large scale density fluctuations…
We herein report an anomalous thermal hysteresis in dielectric permittivity in CaCu3Ti4O12. The anomalous behavior was well explained in terms of the low-temperature Maxwell–Wagner relaxation induced by frozen carriers. A multirelaxation mechanism, i.e., the coupling of the dipole relaxation to the frozen carrier-indu…
The stress evolution in nanocrystalline diamond (NCD) films deposited at different temperatures (from 800to400°C) was investigated. Results showed that the intrinsic stress gradually changed from tensile to compressive with decreasing deposition temperature. Most importantly, the intrinsic stress can be tailored to ze…
We studied photoluminescence (PL) and energy transfer dynamics in CdSe nanocrystal (NC) assembled monolayers on Au surfaces. The close-packed CdSe NC monolayers were fabricated using the Langmuir–Blodgett method on spin-coated inert polymer films on rough-surface Au substrates. The PL intensity and PL decay time were…
The influence of the A-site ionic radii $(⟨{r}_{\mathrm{A}}⟩)$ on the magnetic structure has been investigated in ${\mathrm{La}}_{0.5}{\mathrm{Ca}}_{0.5\ensuremath{-}x}{\mathrm{Sr}}_{x}\mathrm{Mn}{\mathrm{O}}_{3}$ compounds $(0\ensuremath{\leqslant}x\ensuremath{\leqslant}0.5)$ using neutron diffraction, magnetization,…
The fabrication of nanoporous sputtered CaCu3Ti4O12 thin films with high gas sensitivity is reported in this work. The porous microstructure and the nanocrystalline nature of the material promoted the diffusion of the atmosphere into the film, shortening the response time of the samples. Behaving as p-type semiconduct…
Abstract Raman spectroscopy combined with infrared spectroscopy has been used to study the minerals, nullaginite and zaratite. Raman bands are observed at 3650, 3556 and 3309 cm −1 for nullaginite and 3609, 3516 and 3336 cm −1 for zaratite. By using a Libowitzky‐type empirical function, estimation of the hydrogen‐bond…
2,6-Di-O-methylcellulose was prepared from natural and synthetic celluloses. Natural cellulose was converted to 2,6-di-O-thexyldimethylsilylcellulose, then to 3-mono-O-allyl-2,6-di-O-methylcellulose, and finally into 2,6-di-O-methylcellulose. Alternatively, 2,6 di-O-methylcellulose was synthesized from the synthetic c…
Abstract Mesostructured forms of silica (denoted MSU‐J) and aminopropyl‐functionalized silica (denoted AP‐MSU‐J) with wormhole framework structures are effective reinforcing agents for a rubbery epoxy polymer. At loadings of 2.0–10 wt %, MSU‐J silica with an average framework pore size of 14 nm (65 °C assembly tempera…
Surface finish has a vital influence on most functional properties of a component like fatigue life, wear resistance, corrosion resistance, etc. This has given birth to processes such as lapping, honing, burnishing, etc. Burnishing is a fine finishing operation involving the cold working plastic deformation of surface…
First- and second-generation dendrimers with an isocyanide group as the focal functional point (CN-G(n); n: 1,2) and their corresponding organometallic complexes [MCl(CN-G(n))] (M: Au, Cu), [{CuCl(CN-G(n))2}2], and trans-[MI2(CN-G(n))2] (M: Pd, Pt) have been synthesized. The free ligands and the first-generation compl…
Rupture of an individual film in an evolving liquid metal foam is investigated by means of high-speed x-ray radioscopy using white synchrotron radiation. At a frame rate of 5000frames∕s, the rupture event is spread over three to four images. The images show that the remnants of the rupturing film are pulled into the s…
DOI: 10.1002/macp. 200700552 For our experimental situation, when , Equation (6) supplies a higher estimation for the thermal Marangoni number: ∼ 4 ÷ 10 (for MaT ∼ 2), but it is still much less than the critical value of the Marangoni number. We would like to apologize for any inconvenience this mistake may have cause…
During the last decades, pharmaceutical technology has taken the advantage of the advent of nanotechnology and, now days, new pharmaceutical dosage forms are under development to deliver many physicochemically different drug molecules. The present study is to investigate the role and their importance of nanotechnology…
Carbon nanosheets, a two-dimensional carbon nanostructure, are promising electron cathode materials for applications in vacuum microelectronic devices. This letter demonstrates a simple approach to improve the spatial emission uniformity of carbon nanosheets by coating them with a chromium oxide thin film. Photoelectr…
The domain structure of orthorhombic phase in [110]-poled Pb(Mg1∕3Nb2∕3)O3–30.5%PbTiO3 has been studied with analytical transmission electron microscopy. Convergent beam electron diffraction analysis indicates that the orthorhombic phase is an adaptive phase composed of tetragonal nanodomains while in the macroscopic…
Abstract Some seashells of the Philippine venus species and sea coral of Porites sp. were studied by means of FT‐Raman, Fourier transform infrared spectroscopy (FTIR) and Far‐FTIR spectroscopic methods. The Raman spectra show that both Porites sp. and P. venus are of aragonite‐structured CaCO 3 . Detailed spectral ana…
We report experimental observations of relative blue-shifts in the particle?plasmon resonance of gold nanoparticles (Au NPs) covered with a vanadium dioxide (VO2) film as the VO2 material undergoes a semiconductor-to-metal transition at approximately 67??C. Although the extinction spectra of the Au NPs exhibit signifi…
Corona cages are used in overhead power line studies to investigate physical mechanisms involved in corona discharge and to predict radio noise generation. In this paper, we design a small laboratory corona cage to investigate wideband radio noise generation on practical HVac conductor bundles. We introduce and descri…
We proposed an oxygen modulation method for the growth of high crystalline and insulative anatase films. The cycle of deposition under low oxygen pressure and annealing under high oxygen pressure was repeated every 1nm thick growth. The sharp reflection high-energy electron diffraction pattern and step-and-terrace sur…