Materials Literature
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The structural behavior of Al 3+ in peralkaline glasses and melts along the Na 2 Si 3 O 7 -Na 2 (NaAl) 3 O 7 join has been examined to 1200 °C at ambient pressure with 29 Si MAS NMR and Raman spectroscopy. The distribution of Al 3+ among coexisting Q 4 , Q 3 , and Q 2 structural units in the glasses and melts was dete…
The silkworm Bombyx mori is one of the most well-studied insects in terms of both genetics and physiology and is recognized as the model lepidopteran insect. To develop an efficient system for analyzing gene function in the silkworm, we investigated the feasibility of using the GAL4/UAS system in conjunction with pigg…
Ni$_3$Al and Ni$_3$Ga are closely related materials on opposite sides of a ferromagnetic quantum critical point. The Stoner factor of Ni is virtually the same in both compounds and the density of states is larger in Ni$_3$Ga. So, according to the Stoner theory, it should be more magnetic, and, in LDA calculations, it…
ABSTRACT The inhibitory activity of chitosan‐based edible coatings was assessed against 2 food pathogens ( Staphylococcus aureus and Listeria monocytogenes ) and 1 strain involved in food alteration ( Pseudomonas aeruginosa ) on model agar medium and on a real cheese food product. Colony counting and epifluorescence m…
We describe a direct synthetic method for preparing narrowly dispersed silver nanoparticles without using size-selection processes by thermal reduction of silver trifluoroacetate in isoamyl ether in the presence of oleic acid. This direct synthesis is versatile, easy to control synthetically, and able to make Ag nanop…
This paper describes the synthesis and characterization of new organic/inorganic hybrid materials formed from the mixed oxide (Ti,Sn)O 2 nanoparticles and polyaniline (PANI). The preparation method is based on a sol−gel technique using titanium tetra-isopropoxide and tin tetrachloride as oxide precursors, and two synt…
Highly porous emulsion-templated materials were synthesized by polymerization of concentrated CO(2)-in-water (C/W) emulsions. The method does not use any organic solvents, in either the synthesis or purification steps, and no solvent residues are left in the materials. It was found that the emulsion stability is stron…
In this article we report on the fabrication of subwavelength antireflection structures on silicon substrates using a trilayer resist nanoimprint lithography and liftoff process. We have fabricated cone-shaped nanoscale silicon pillars with a continuous effective index gradient, which greatly enhances its antireflecti…
The crystal structure and morphology of inorganic−organic hybrid POSS nanoparticles, consisting of an inorganic core of silicon and oxygen and outer organic attachments of alkyl groups, has been studied using X-ray diffraction and electron microscopy. These molecules self-assemble to form a hexagonally packed structur…
Abstract Polymer nanocomposites may provide significantly increased modulus, gas barrier, thermal performance, atomic oxygen resistance, resistance to small molecule permeation and improved ablative performance when compared to typical traditional carbon‐fiber‐reinforced polymeric composites. This presentation gives a…
The work in this article is part of a project to develop a quantitative description of stress corrosion cracking (SCC) on the secondary side of pressurized water reactor (PWR) steam generator tubing based on existing information from operating plants and from laboratory experiments. This work is the second step in dev…
Synthetic Fe 2+ monosulfide, FeS am , displays a disordered tetragonal mackinawite structure. It is nanocrystalline, with an average primary particle size equivalent to a crystallite size of 4 nm and a corresponding specific surface area of 350 m 2 /g. It can be described in terms of a mixture of two end-member phases…
Steady-state and time-resolved fluorescence measurements were performed to elucidate the fluorescence quenching of oxazine, rhodamine, carbocyanine, and bora-diaza-indacene dyes by amino acids. Among the natural amino acids, tryptophan exhibits the most pronounced quenching efficiency. Especially, the red-absorbing dy…
This is the first of three papers in which the kinetics of formation of chemically bonded phosphate ceramics is discussed. A literature survey indicates that the formation of such ceramics is a three‐step process. First, oxides dissolve in a phosphoric acid or an acid phosphate solution and metal ions are released int…
Dielectric spectroscopy in the time or frequency domain offers new opportunities for an off-line, on-site insulation condition assessment of HV electric power equipment and its predictive maintenance.
Single-phase approaches are introduced for the synthesis of nearly monodisperse Au and other noble metal nanocrystals. The new approaches possess all the advantages of the popular Brust method. With weak ligands or surfactants for the metal ions, the control of the size and size distribution of the nanocrystals in syn…
The crystal and molecular structure, together with the hydrogen-bonding system in cellulose I α, has been determined using atomic-resolution synchrotron and neutron diffraction data recorded from oriented fibrous samples prepared by aligning cellulose microcrystals from the cell wall of the freshwater alga Glaucocysti…
The measurement of the intrinsic radioactivity in a wide range of solid, liquid, and gaseous materials is very important for several activity domains, such as in particle physics experiments, medical research, environmental activity, and natural resources. Very precise measurements can be undertaken in the “La Vue-des…
Low-frequency light scattering spectra of As 2 S 3 glass former have been investigated over a temperature range of 300–712 K. Using the model of a damped oscillator, the parameters of the intensities of the boson peak and of the fast relaxation as well as the boson peak position and the relaxational time are extracted…
The existence of the unsolvated 7,7,8,8-tetracyano-p-quinodimethane (TCNQ) dianion is proved experimentally. The dianion was formed in 50-keV collisions between TCNQ monoanions and sodium vapor. In the collision process, electron capture to the monoanion occurs with a cross section of about 1 Å2. The lifetime of the d…