Materials Literature
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Electron paramagnetic resonance (EPR) spectroscopy was used to study the interactions between stable free radicals and gold nanoparticles. The nitroxyl free radicals used were TEMPO, TEMPAMINE, and TEMPONE. Two sizes of Au particles, 15 and 2.5 nm in diameter, were synthesized to investigate the interactions with the…
Recently we investigated a nitrate-salt-mediated formation route of Co 3 O 4 spinel nanocubes with a uniform size of ca. 47 nm in aqueous solution at 95 °C ( J. Phys. Chem. B 2003, 107 (4), 926−930). In the present work, we examined various synthetic parameters of this new method. By varying reaction temperature and t…
Ultrasound was employed to increase the growth rate of bacterial cells attached to surfaces. Staphylococcus epidermidis, Pseudomonas aeruginosa, and Escherichia coli cells adhered to and grew on a polyethylene surface in the presence of ultrasound. It was found that low-frequency ultrasound (70 kHz) of low acoustic in…
Intrinsically superhydrophobic foams with contact angles greater than 150° were prepared using a sol−gel phase-separation process. Hydrophobicity was built in by using organofunctionalized inorganic monomers and setting the conditions so that they were retained in the product. The materials were characterized by advan…
The force required to separate a carbon nanotube from a solid polymer matrix has been measured by performing reproducible nanopullout experiments using atomic force microscopy. The separation stress is found to be remarkably high, indicating that carbon nanotubes are effective at reinforcing a polymer. These results i…
The development of reliable, eco-friendly processes for the synthesis of nanoscale materials is an important aspect of nanotechnology. In this paper, we report on the use of an alkalotolerant actinomycete ( Rhodococcus sp.) in the intracellular synthesis of gold nanoparticles of the dimension 5–15 nm. Electron microsc…
Multiwalled carbon nanotube-supported Pt (Pt/MWNT) nanocomposites were prepared by both the aqueous solution reduction of a Pt salt (HCHO reduction) and the reduction of a Pt ion salt in ethylene glycol solution. For comparison, a Pt/XC-72 nanocomposite was also prepared by the EG method. The Pt/MWNT catalyst prepared…
The room temperature compressibility of one synthetic chamosite and two intermediate iron magnesium chlorites has been measured up to 87 kbar in situ using a MAX-80 multi-anvil press and synchrotron radiation. The Murnaghan bulk compressibility moduli range between 690 and 911 kbar. These values are much higher than d…
Na-cancrinite [ideal composition: Na 8 (AlSiO 4 ) * (OH) 2 * 8H 2 O] has been synthesized in a mixture of 1, 3- or 1, 4-butanediol and water either with direct reactants (silica sources: tetraethoxysilane, precipitated silica, alumina sources: aluminium sec-butoxide) or gels formed from tetraethoxysilane and aluminium…
The hydrophobin Sc3 from the fungus Schizophyllum commune assembles from the aqueous phase into ordered structures with substantially different characteristics depending upon experimental conditions. Under the first condition, a vortexing procedure widely reported in the literature, interfacial assembly yields highly…
Abstract The interaction of liposomes with biological systems is very complex but has bearing on most topics in liposomal drug delivery. In this chapter we will describe the various interactions occurring in biological systems and the factors that determine these interactions. Biological systems in liposome research i…
A thin magnetite film grown by molecular-beam epitaxy on MgO(100) was studied by nuclear resonant scattering (NRS) at grazing incidence geometry. We show that the NRS data yield more information about the shape of the directional spin distribution than M\"ossbauer spectroscopy, in which only the average angle with res…
Kochite, ideally Na 2 (Na,Ca) 4 Ca 4 (Mn,Ca) 2 Zr 2 Ti 2 (Si 2 O 7 ) 4 (O,F) 4 F 4 , is a new member of the rosenbuschite group from the alkaline complex of Werner Bjerge, East Greenland. It occurs in nepheline syenite as lath-shaped to acicular crystals in aggregates up to 0.3 × 1.0 mm. Associated minerals are nephel…
Single crystals of anhydrous uric acid ( UA ) and uric acid dihydrate ( UAD ) were grown from supersaturated aqueous solutions containing the fluorescent dye acriflavine neutral ( AN ), a two-component commercial mixture of proflavine ( P ), and its 10-methylated analogue acriflavine ( A ). During UA crystal growth at…
This paper describes a comparative study of polymers containing push−pull type azobenzene moieties in their main and/or side chains. The polymers were systematically designed and synthesized specifically for this work in order to investigate their photodeformation through the migration of polymer chains, which was ind…
Single crystal X-ray structure data have been obtained for wairakite (Wairakei, New Zealand), Ca 0.95 Na 0.06 [Al 1.96 Si 4.04 O 12 ]·2H 2 O, at temperatures of 20°C, 170°C, 210°C, 400°C, and 600°C. Heating of wairakite up to 200°C is accompanied by a significant increase in the unit cell volume. At 145°C, the initial…
Liquid crystalline copolyesters of high molecular weight were obtained by polycondensation of aromatic diols, diacyl dichlorides, oligolactides, and poly(ethylene glycol)s. Hydrophilicity of the copolyesters was controlled by the content of ethyleneoxy moieties as verified by contact angle measurements. Copolyesters w…
Amorphous boron nitride (BN) powder was prepared by mechanically milling hexagonal BN and used as a starting material for studying BN phase transformation behavior. Fabricated amorphous BN (aBN) powder was significantly reactive with humidity in the air. When it was kept under a dry nitrogen atmosphere without H 2 O o…
In order to find criteria for discrimination between surface color centers at terraces and steps, and bulk color centers, the characteristic losses of these centers have been investigated by electron energy loss spectroscopy on an epitaxial MgO film grown on a Ag (1,1,19) surface. This film contains a significantly hi…
The broadening of the exciton absorption peak in films composed of small, ∼2 nm diameter CdSe nanocrystals capped by 1-thioglycerol has been interpreted as evidence of interdot carrier coupling. This exciton broadening is seen here for 2.1 nm diameter CdSe nanocrystal arrays, and part of it is correlated with the loss…