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。
Freely suspended gold nanoparticle arrays have been fabricated by encapsulation into layer-by-layer nanomembranes. Such nanomembranes (see Figure) retain outstanding micromechanical properties and have an anisotropic mechanical response due to the uniformly oriented nanoparticle-containing stripes. Periodic variation…
Abstract When preparing specimens for TEM analysis, it is important that specimens routinely be large enough to manipulate with forceps and cohesive enough to hold together as a single entity. However, anyone working in EM will have some specimens that are too small to see or centrifuged pellets that easily fall apart…
The microstructure evolution and mechanical properties of alumina doped with rare earth oxide and rare earth-aluminosilicate glass has been investigated in order to understand better the impact of rare earth addition on hardness and fracture toughness. The aims of the present work are to examine the possibly beneficia…
Abstract In spinel (MgAl2O4), the strongest infrared band at 485 cm−1 shows less LO–TO splitting than the medium band at 670 cm−1. This unexpected relationship is explained in terms of the vibrational coupling of these TO modes. A new manner for evaluating the LO mode is proposed.
The mechanical properties of a quasi-symmetrical planar functionally graded material (FGM) of Al2O3 / Al2O3+20%ZrO2 / Al2O3+5%ZrO2 prepared by electrophoretic deposition and pressureless sintering has been studied. Hardness and fracture toughness were measured using indentation methods on cross sections of samples. Fr…
The texture and grain boundary structure of recrystallized materials is dependent upon the character of the deformed matrix, and the selective nucleation and growth of crystallites from the deformation structure. Proper description of the deformed matrix includes not only local crystallite lattice orientation, but als…
Nonisothermally crystallized samples of the neat polyamide 6 homopolymer (PA 6) and of a series of commercial nanocomposites (PNC) containing up to 7.5 wt.% of exfoliated organoclay nanoparticles were characterized at room temperature by wide‐angle and small‐angle X‐ray scattering, while their melting behavior was stu…
Abstract Fully relativistic, four-component, density functional theory calculations (4c-DFT) were performed for [MO 4 (OH) 2 ] 2- and Na 2 [MO 4 (OH) 2 ], where M=Ru, Os, and Hs. The electronic structure of the Hs complex ion was shown to be similar to that of the Os complex ion, though [HsO 4 (OH) 2 ] 2- should be mo…
Neat polyamide 6 homopolymer (PA 6) and a series of commercial polymer nanocomposites (PNC) containing up to 7.5 wt. % of exfoliated organoclay nanoparticles were characterized by the exothermic effects of nonisothermal crystallization in the standard differential scanning calorimetry (DSC) mode during constant‐rate c…
In the article the results of studies on modification of poly(L-lactide) (PLA) via influencing its thermal history, artificial nucleation of crystallization, plasticization or filling with montmorillonite were summarized.It was found that PLA heated from the glassy state and isothermally cooled from the molten state,…
The Bi–Sr–Co–O system has been investigated for small bismuth contents in order to study the formation of the misfit oxide series built up from the stacking of three rocksalt-type layers (n=3) with a single CdI2-type CoO2 hexagonal layer. Starting from nominal compositions, written as [Sr2Co1−xBixO3]RS[CoO2]1.8 (x=0.1…
Lyophilization increases the shelf-life of liposomes by preserving it in a dry form as lyophilized cake to be reconstituted with water immediately prior to administration. Aiming at increasing stability and availability of 5-Fluorouracil liposomal products, 5-Fluorouacil Stable Plurilamellar Vesicles were prepared. Fr…
In microchannel flow, gas–liquid interface behavior will be important for developing a wide range of microfluidic applications, especially in micro reactors. In this article, we discuss some topics related to capillary action and two-phase fluid behavior in a microchannel. One of the topics is interface motion in the…
In this study nonlocality is discussed with regard to the differential and discrete formulations. Here, nonlocality is found to be a concept attaining not to the description of the material, but to the governing equations. This has made it possible to discuss the op-portunity of introducing nonlocality in the constitu…
Mössbauer spectra of Fe-substituted 3/2-mullite (10.3 wt% Fe 2 O 3 ) have been measured from room temperature up to 1200 °C under nitrogen atmosphere. A Voigt-type fit to the spectral line shape is proposed that is based on the assumption of three non-equivalent Fe 3+ environments A, B, and C in the mullite structure.…
In this paper we report the rapid synthesis of Se–Te based chalcogenide glasses through microwave irradiation without the help of metal powders. Mixtures of chalcogens can be made to couple to microwaves when at least one constituent of the mixture has a relatively higher electrical conductivity. Also, this constituen…
High-energy ion beam irradiation of cross-linking type polymers gives nanowires formed by cross-linking reactions along the ion track trajectories. A fairly simple technique has been developed to control the size and number density of nanowires based on polystyrene (PS) by selecting appropriate ion beam characteristic…
The structural aspects of xCs2O-(1-x)B2O3 glasses have been investigated by molecular dynamics as functions of Cs2O content (x=0.2, 0.3, and 0.4) and temperature (T=300 and 1250 K). The tetrahedral (BØ4-) and triangular (BØ3,BØ2O-, and BØO2 (2-)) short-range order borate units were found to be the structure-building e…
A preparação de complexos bentonita-ionenos a partir da adsorção de tetrametil-[x,y]-ionenos, onde x= 2 e y= 4,6,10 ou 12, e o 2-hidróxi-3-cloro-ioneno, EPI-DMA, foi realizada com a finalidade de observar o comportamento do tamanho do espaçador do ioneno na expansão basal (d001) das camadas de uma bentonita comercial…
The growth of science and technology of polyurethanes leads to the development of new materials with more desirable properties. Such kinds of materials include metal‐containing polyurethanes, poly(urethane‐urea)s, poly(urethane‐ether)s, poly(urethane‐ester)s, poly(urethane‐ether‐ester)s, poly(urethane‐imide)s, and pol…