Materials Literature
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Multiwalled carbon nanotubes have been deposited on graphite cathodes by the arc discharge technique in a He atmosphere. A micro-Raman mapping, performed after scanning electron microscopy, reveals, in some regions of the sample, strong bands in the $1780--1860\phantom{\rule{0.3em}{0ex}}{\mathrm{cm}}^{\ensuremath{-}1}…
Basic fibroblast growth factor (bFGF) was immobilized onto quartz slides and collagen films by assembly with chondroitin sulfate (CS) in a layer-by-layer (LBL) manner. First, the LBL-deposition process on the amino-silanized quartz slides was monitored by UV-vis spectroscopy and water contact angle measurement. By sub…
By use of 15N NMR spectroscopy, we have measured the pKa values of the aldimines 15N-(pyridoxyl-5'-phosphate-idine)-methylamine (2a), N-(pyridoxyl-5'-phosphate-15N-idine)-methylamine (2b), and 15N-(pyridoxyl-idine)-methylamine (3). These aldimines model the cofactor pyridoxal-5'-phosphate (PLP, 1) in a variety of PLP-…
[structure: see text] Two types of covalently NH-linked porphyrin-phthalocyanine dyads, connected either through the meso phenyl group or the beta-pyrrolic position of the porphyrin, have been synthesized following statistical condensation methodologies for phthalocyanine preparation and palladium-catalyzed amination…
The equilibrium properties of monolayers of two polymers: poly(octadecyl acrylate) and poly(vinyl stearate) on water have been measured. The surface pressure (Pi) versus surface concentration (Gamma) curves indicate that the water-air interface is a poor solvent for both polymers. The thermal expansivity shows a sharp…
We investigate the room temperature ferromagnetism of nanocrystalline Co-doped $\mathrm{Ce}{\mathrm{O}}_{2}$ films electrodeposited onto Si(001) substrates. The nanocrystalline $\mathrm{Ce}{\mathrm{O}}_{2}$ films, containing from $0.5\phantom{\rule{0.3em}{0ex}}\text{to}\phantom{\rule{0.3em}{0ex}}13.2\phantom{\rule{0.3…
Two routes for the introduction of highly fluorescent peryleneimide chromophores into the scaffolding of polyphenylene dendrimers via iterative Diels-Alder cycloadditions are presented. The key intermediates for the divergent dendrimer buildup were two cyclopentadienone branching units carrying two peryleneimides and…
New highly hydrophobic/lipophobic biopolymers were prepared by the controlled heterogeneous pentafluorobenzoylation of cellulose substrates, i.e., plant and bacterial cellulose fibers. The characterization of the modified fibers was performed by elemental analysis, FTIR spectroscopy, X-ray diffraction, thermogravimetr…
Hollow platinum nanospheres (see figure) have been fabricated by optical excavation of the core silver metal of Ag@Pt core/shell nanoparticles. The surface plasmon resonances of the shell platinum metal were excited with picosecond laser pulses of 1064 nm. Thermalized photon energy induces the silver to melt and effus…
Homogeneous dispersion of carbon nanotubes (CNTs) throughout the polymer matrix and their adequate interfacial bonding are critical for load transfer in CNT–polymer composites. However, both cannot be realized simultaneously by either covalent or noncovalent functionalization. A hybrid system integrating both covalent…
The series of [Pd(dmit) 2 ] salts (dmit = 1,3-dithiole-2-thione-4,5-dithiolate) is a Mott insulator on an anisotropic triangular lattice and has an antiferromagnetic exchange constant J ∼ 200 K. While it has been revealed that most of them undergo antiferromagnetic transitions, the nature of the spin state of EtMe 3 S…
A new class of nanostructures were fabricated by one-step hydrothermal reaction of a mixture solution of TiO 2 anatase powder and a Sn-porphyrin, trans -dihydroxo[5,10,15,20-tetrakis( p -tolyl)porphyrinato]tin(IV) [SnTTP], and they were found to be well-crystalline trititanate (H 2 Ti 3 O 7 )-type multilayered nanofib…
Calculations have been made for single-walled zigzag ( n ,0) carbon nanotubes containing substitutional nitrogen impurity atoms using ab initio density functional theory. It is found that the formation energies of these nanotubes depend on the tube diameter, as do the electronic properties, and that they show periodic…
The surface tension of polymers in a supercritical fluid is one of the most important physicochemical parameters in many engineering processes, such as microcellular foaming where the surface tension between a polymer melt and a fluid is a principal factor in determining cell nucleation and growth. This paper presents…
AIMS: Clusters of nanoparticles may significantly improve the sensitivity of diagnostics and the safety and efficacy of therapeutic nanotechnologies in medicine. We report methods for the formation of nanoparticle clusters and for monitoring their accumulation in cancer cells. METHODS: The accumulation of gold nanopar…
Recently there has been a strong interest in the area of defect formation in ordered structures on curved surfaces. Here we explore the closely related topic of self-assembly in thin block copolymer melt films confined to the surface of a sphere. Our study is based on a self-consistent field theory (SCFT) model of blo…
The influence of different compositional modifications on the magnetic entropy change and refrigerant capacity of Finemet, Nanoperm, HiTperm, and bulk amorphous alloys is presented. For all the studied alloys, the field dependence of the magnetic entropy change exhibits a quadratic dependence in the paramagnetic regim…
We have recently validated a macromolecular prodrug strategy for improved cancer chemotherapy based on two features: (a) rapid and selective binding of thiol-reactive prodrugs to the cysteine-34 position of endogenous albumin and (b) acid-sensitive promoted or enzymatic release of the drug at the tumor site [Kratz, F.…
Highly crystalline rectangular palladium nanoparticles have been successfully synthesized via the reduction of K 2 PdCl 4 by ascorbic acid in the presence of a surfactant, cetyltrimethylammonium bromide, under room temperature and trisodium citrate is a key factor for high yield of nanocubes and nanorods. The average…
The interaction, or wetting, of long aligned carbon nanotube (CNT) forests with off-the-shelf (no solvent added) commercial thermoset polymers is investigated experimentally. A technique for creating vertically aligned CNT composite microstructures of various shapes is presented. The effective wetting of the forests,…