Materials Literature
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Nanocrystalline powders of Ce 0.5 Zr 0.5 O 2 were synthesized and characterized for the application as a catalyst support and oxygen storage medium in automotive catalysis. Detailed pair-distribution function analysis of the neutron diffraction data revealed an unusual structure of the nanocrystallites, consisting of…
Nitrogen-doped carbon nanotubes were grown vertically aligned on the iron nanoparticles deposited on silicon substrates, by thermal chemical vapor deposition of methane/ammonia and acetylene/ammonia mixtures in the temperature range 900−1100 °C. The concentration of the nitrogen atoms has been controlled in the range…
In this contribution we present two cases of phase transitions, in which the ability to control the reproducible formation of the desired physical form requires a control of crystallization parameters and a deep understanding of the phase diagram.
Abstract Dendrimer‐protected gold nanoparticles have been facilely obtained by heating an aqueous solution containing third‐generation poly(propyleneimine) dendrimers and HAuCl 4 without the additional step of introducing other reducing agents. Transmission electron microscopy (TEM) and UV‐vis data indicate the size,…
Poly(ethylene oxide) (PEO)-brushes are generally recognized as protein-repellent surfaces, and although a role in discouraging microbial adhesion has been established for some strains and species, no study exists on the effects of PEO-brushes on a large variety of bacterial and yeast strains. In this paper, a PEO-brus…
This study was designed to clarify which vascular carrier, the arteriovenous shunt loop or the arteriovenous bundle, has more potential as a vascular carrier for an artificial skin flap in rats. An arteriovenous shunt loop was constructed between the femoral artery and vein using an interpositional artery (group I) or…
Terpolymerization of poly(ethylene glycol) (PEG), divinyl ethers, and serinol can be used to synthesize water soluble, hydrolytically labile, amino-pendent polyacetals (APEGs) suitable for drug conjugation. As these polyacetals display pH-dependent degradation (with faster rates of hydrolysis at acidic pH) and they ar…
Self-assembly of [Ag(CN)2]-, 3-cyanopyridine, and iron(II) gives triple interpenetration of three-dimensional spin crossover (SCO) networks with the NbO topology, which interact each other via argentophilic interactions. Superposition of the networks along the c-axis defines an infinite mosaic of trigonal and hexagona…
Nanotechnologies promise new means for drug delivery. ICAM-1 is a good target for vascular immunotargeting of nanoparticles to the perturbed endothelium, although endothelial cells do not internalize monomeric anti-ICAM-1 antibodies. However, coupling ICAM-1 antibodies to nanoparticles creates multivalent ligands that…
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…