Materials Literature
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A new type of collagen/chitosan/heparin matrix, fabricated by gelation of collagen/ chitosan with heparin sodium containing ammonia, was produced to construct livers by tissue engineering and regenerative engineering. The obtained collagen/chitosan/heparin matrix was found to be highly porous, swelled rapidly in PBS s…
A resonant diffraction grating comprising a mirror, a dielectric layer and a high index corrugation at the layer-air interface is shown to exhibit off-Littrow the record diffraction efficiency of 99% in the -1st reflected order at 1064 nm wavelength thanks to the excitation of a leaky mode of the layer. Such high figu…
Highly ordered near-stoichiometrical polycrystalline InSb nanowire arrays have been fabricated by direct current (dc) electrodeposition inside the nanochannels of anodic alumina membranes (AAMs) and subsequent annealing. X-ray diffraction patterns and X-ray energy dispersion analysis reveal the change of crystal struc…
The size and shape of nanoparticles can be controlled by varying the pH and concentration of the fulvic acid (FA) colloidal solution. FA thin solid films with embedded Au nanoparticles have been fabricated, and their optical field enhancing properties tested in surface-enhanced Raman scattering (SERS). High-resolution…
A study of the electrodeposition (ED) of silicon from silicon halides in a nonaqueous electrolyte solution is described. In spite of the use of nonoxidizing electrolytes, the electrodeposits usually become oxidized on air exposure. In similarity to other work, it is postulated that this is due to the deposit being for…
To probe the microscopic balance of forces close to a moving contact line, the boundary conditions around viscous drops sliding down an inclined plane are investigated. At first, the variation of the contact angle as a function of the scale of analysis is discussed. The dynamic contact angle is measured at a scale of…
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…