Materials Literature
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We study the contour (or contact) line of a large water puddle floating on an organic liquid substrate. The line tension 𝒯 is a two-dimensional analogue of surface tension. We manipulate the line through a vertical metallic rod. (i) When stretched by a horizontal force f, the line makes a kink characterized by an angl…
The Vilsmeier reaction is one of the important reactions in the organic photoconductor industry, and quantitative information of thermal hazards of the reaction is needed for process control and safety. In this report, the thermal hazards of Vilsmeier reaction are investigated, and heats of reaction are measured using…
The photoinitiated bulk polymerization of liquid crystalline thiolene monomers based on a phenyl benzoate core was investigated and the structure of the corresponding polymers analyzed. We show that polymerization occurs substantially in bulk, and can be initiated on demand by UV-irradiation. The liquid crystalline th…
Two methods are presented and exemplified for the characterization of self-organizing microporous polymer film surfaces via optical microscopy/image analysis. The first concerns the distribution of the pore diameters as measured by applying the Gini coefficient, which gives quantification to the degree of irregularity…
The synthesis and characterization of various thiophene-based bent-rod liquid crystals are reported, and the effects of varying lateral dipole and core desymmetrization upon mesophase behavior are described. Incorporation of desymmetrized core 7 into the molecular framework was found to have very different consequence…
Parallel three-helix bundle metalloproteins incorporating C-terminal thiol groups have been designed to orient vertically on a gold(111) surface. A small area of pre-assembled octadecanethiol was exchanged with the proteins under the action of an AFM tip. The resulting “nanografted” metalloprotein was imaged at low ap…
Methyl esters 2, 3, and 5 of corallistins B, C, and E, respectively, isolated from the Coral Sea demosponge Corallistes sp., were successfully synthesized by the MacDonald method (for corallistin B ester) and via a,c-biladiene cyclization (for corallistins C and E esters). In order to compare with the 1 H-NMR data rep…
The synergistic effect due to the application of ultrasound on the photocatalytic degradation of phenol and chlorophenols was demonstrated in the presence of Hombikat TiO 2 suspensions in our sonophotocatalytic reactor. A noticeable enhancement of the reaction rate was found when ultrasound was combined with the photo…
Aging of solutions of chitosan varying in degree of acetylation (DA) and degree of dissociation (alpha) was studied using two techniques. The first concerned potentiometric experiments performed during 3 days on solutions having the same concentration of amino groups (5.2% < DA < 70.6% and 0 < alpha < 1.1). The presen…
Intermolecular carbon nanotube junctions were formed through amide linkage of amino functionalized multiwall carbon nanotubes and [Ru (dcbpy)(bpy)2](PF6)2, an inorganic metal complex. Nanotube interconnects were visualized using atomic force microscopy. Absorption and emission spectroscopy showed significant changes b…
Uniform and small-diameter single-walled carbon nanotubes (SWNTs) have been produced using identical molecular nanoclusters containing Fe and Mo atoms with a defined molecular formula and a specific structure as catalysts in a chemical vapor deposition method. The average diameter of the SWNTs produced in these experi…
Heterocyclic unit 2 containing complementary donor-donor-acceptor (DDA) and acceptor-acceptor-donor (AAD) hydrogen bonding arrays at an angle of about 60 degrees was designed to self-assemble into a hexamer. To investigate whether this unit could self-assemble dendrimers, the 2,8-diamino-2-N-ethylpyrimido-(4,5-b)(1,8)…
Porous alumina membranes are commercially available and have been widely used in recent nanoscale research, for example, as templates in nanowire fabrication through electrodeposition. In this report, we present a new use for porous alumina membranes in the fabrication of alumina nanotubes/nanowires desired in electro…
In-situ rheo-SAXS (small-angle X-ray scattering) and rheo-WAXD (wide-angle X-ray diffraction) studies were carried out to investigate the nature of shear-induced precursor structures in isotactic polypropylene (iPP) melt at 165 °C, near its nominal melting point. Immediately upon the cessation of shear, SAXS patterns…
In this study, we fabricated new spherical silica templates with submicrometer sized solid cores containing an encapsulated Au nanoparticle surrounded by a mesoporous shell structure. Hollow spherical carbon and polymer capsules, containing gold nanoparticles, were synthesized using these silica templates. The resulti…
Chemical vapor deposition (CVD) is the most promising synthesis route for economically producing large quantities of carbon nanotubes. We have developed a low-cost CVD process for the continuous production of aligned multiwall carbon nanotubes (MWNTs). Here we report the effects of reactor temperature, reaction time,…
X-ray powder diffraction experiments were performed at pressures up to 14 GPa and at room temperature. The orthorhombic lattice was retained at pressures up to 10 GPa. Above 10 GPa, however, a broad glassy background developed. The lattice constants, a , b , c , and the orientation angle at 2.72 GPa are 5.845, 5.220,…
The pressure dependence of the Curie temperatures of the Fe 2 P-type intermetallic compounds MnRhP, MnRhAs and MnRhAs 0.6 P 0.4 was investigated up to 8 GPa. For MnRhAs both the Curie temperature T C and the temperature T t of the transition from AF I to the canted state increased with pressure. However, T t decreased…
The catalytic effects of copper-based alloys in diamond growth have been investigated. A single crystal of diamond has been obtained by the temperature gradient method (TGM), using Cu–Mn–Co and Cu–Co alloys as catalysts. It was found that the melted Cu–Mn–Co and Cu–Co alloys show low viscosity. The eutectic temperatur…
The paper develops a one-dimensional magneto-elastic model of a magnetostrictive fiber actuated polymer matrix composite material which accounts for a strong viscoelastic response in the polymer matrix. The viscoelastic behavior of the composite polymer matrix is modeled with a three parallel Maxwell element viscoelas…