Materials Literature
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A lithium-ion highly conductive new crystal was first precipitated in the Li 2 S – P 2 S 5 glass-ceramics obtained by crystal- lization of the glasses. The 70 Li 2 S ⋅ 30 P 2 S 5 ( mol % ) glass-ceramic heated at 360 ° C showed the highest conductivity of 3.2 × 10 − 3 S cm − 1 at room temperature and the lowest activa…
Zinc oxide superstructured films with superhydrophobicity or superhydrophilicity were successfully prepared by treatment of 1 mM of a Zn2+–hexamethylenetetramine mixed solution at 95 °C for a desired aging time.
The development of a type of carbon-nanotube-promoted Co-Cu catalyst, which displays excellent performance for highly effective and selective formation of the C(2-4)-oxygenates, especially BuOH and DME, from syngas, is reported.
Ag and Ru nanoparticles stabilized by H5PV2Mo10O40, prepared by a sequence of redox reactions and supported on alpha-alumina, were effective catalysts for the direct aerobic epoxidation of alkenes in the liquid phase.
The position of the surface plasmon resonance (SPR) band of Au nanoparticles was tailored by controlling the refractive indices (n) of the embedding matrices, to develop different coloured coatings on glass substrates. Five sets of Au nanoparticle doped coatings were prepared from sols derived from tetraethyl orthosil…
This paper provides a convenient and simple method for fabricating of large amounts (kilogram-scale) of nanomaterials containing nanoparticles in a polymeric matrix. The encapsulation was done by thermal decomposition of metal containing compounds (MRn; M=Ba, Bi, Ca, Cd, Co, Cr, Cu, Fe, Mn, Mo, Nd, Ni, Pt, Re, Ti, Pb,…
This report about backscattering measure-ments of the speckle produced by strongly-scattering liquid media shows that the size of the backscattered speckle depends on scattering and anisotropy coefficients. These measurements were aimed at assessing the effects of polarization characteristics of the incident laser bea…
Silicone-based polymers with reduced protein adsorption were successfully prepared by incorporating mono- or bifunctional poly(ethylene oxide) (PEO) derivatives, respectively, into PDMS during rubber formation using classic room temperature vulcanization chemistry. Characterization of the films by water contact-angle…
Electrochemical and electrochromic properties of MnO 2 nanosheet electrodes prepared by layer-by-layer assembly on transparent conductive indium-tin oxide substrates were examined.Cyclic voltammograms ͑CVs͒ of multilayer film electrodes of MnO 2 nanosheets in nonaqueous Li + -containing electrolyte showed well-defined…
We present an investigation of the magnetic entropy /spl Delta/S and resistivity /spl rho/, and the relation between them, for La/sub 0.67/Ca/sub 0.33/MnO/sub 3/ film. We found that the maximum /spl Delta/S is approximately 6 J/kg/spl middot/K, and the maximum magnetoresistance (defined as /spl rho/(0)//spl rho/(H)-1)…
We show in this paper that metamaterials in which some components of the permittivity and permeability tensors can have negative real values (thus associated with left-handed metamaterials) call for a reconsideration of the common concepts of critical angle and Brewster angle. By studying the reflection coefficient fo…
Abstract Activity at the NASA Langley Research Center (LaRC) has focused on developing low density polyimide foam and foam structures which are made using monomeric solutions or salt solutions formed from the reaction of a dianhydride and diamine dissolved in a mixture of foaming agents and alkyl alcohol at room tempe…
Novel composite materials based on mixtures of samarium-doped ceria (SDC)-carbonate were examined for use as electrolyte materials in low-temperature solid oxide fuel cells (LTSOFCs) operating at 400-600°C. The composite electrolytes showed high ion conductivity at evaluated temperatures. Composition and calcination t…
Nanoporous carbons obtained by selective leaching of Ti and Al from , as well as B from , were investigated as electrode materials in electric double-layer capacitors. Cyclic voltammetry tests were conducted in from on carbons synthesized at 600, 800, 1000, and . Results show that the structure and pore sizes can be t…
Shaped silica constructed by silica fiber with axial poly(ethyleneimine)s (PEIs) filaments was available simply from rapid hydrolytic condensation of tetramethoxysilane (TMOS) upon aggregates of PEIs with different architecture.
The electrochemical properties of RuO2/LNO and RuO2/SA electrodes made of RuO2 rods and plates of nanometre size on LiNbO3(100) and sapphire(0001) substrates are investigated. Both rods and plates are grown vertically using chemical vapor deposition. The RuO2/LNO electrode has a higher electrolyte/solid surface area c…
Electrically conducting diamond powder was prepared by coating insulating diamond powder ( 8 - 12 μ m diam, ∼ 2 m 2 ∕ g ) with a thin boron-doped layer using microwave plasma-assisted chemical vapor deposition. Deposition times from 1 to 6 h were evaluated. Scanning electron microscopy (SEM) revealed that the diamond…
Textile Technology: The sun-blocking properties of a textile are enhanced when a dye, pigment, delustrant, or ultraviolet absorber finish is present that absorbs ultraviolet radiation and blocks its transmission through a fabric to the skin. For this reason, dyed fabrics provide better sun protection than bleached fab…
Introduction. 1. 1 Cellulose: The Most Abundant Natural Organic Compound. 1. 2 New Era of Cellulose Derivatives as Artificial Materials in Middle 19th Century: Cellulose Chemical Industries . 1. 3 Emergence of Polymer Science in 1920s . 1. 4 Further Development of Molecular Characterization of Cellulose and Cellulose…
The significance of kinetics on the development of microstructures in connection with sintering of ceramics is well recognized. In practice, however, it still remains a challenge to prepare designed microstructures via engineering the sintering kinetics because of an insufficient understanding of the different operati…