Materials Literature
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Theoretical calculations on undefected nanoscale materials predict impressive mechanical properties. In this review we summarize the status of experimental efforts to directly measure the fracture strengths of inorganic and carbon nanotubes and discuss possible explanations for the deviations between the predicted and…
Two series of WO(x)/TiO(2) catalysts, containing W surface densities up to 4.4 W atoms/nm(2), were prepared by pore volume impregnation of two different supports, titanium oxyhydroxide (amorphous) or titanium oxide (crystallized, 100% anatase). The influence of W surface density and the nature of the support on the su…
We have investigated the synthesis of lead‐magnesium‐niobate–lead‐titanate perovskite powder using high‐energy milling of the constituent oxides. The compositions of the crystalline and amorphous phases as a function of milling time were determined with X‐ray powder diffraction using a Rietveld refinement. The perovsk…
A series of new soluble, thermally stable polymers that contain phenylthiourea and azo groups in the polymer backbone were synthesized from a novel bisphenol and diacid chlorides. The novel bisphenol containing phenylthiourea and azo groups was synthesizedinthreesteps. In the first step, 4,4‘-bis(thiourea) biphenyl (B…
A new method for evaluating the elastic–plastic properties of ceramics from room temperature up to the onset of creep based on Hertzian indentation testing is proposed. Indentation stress–strain curves are compiled for representative alumina and zirconia ceramics at prescribed temperatures. Deconvolution of the indent…
Extended conjugated chromophores containing (porphinato)zinc components that exhibit large optical polarizabilities and hyperpolarizabiliites are incorporated into amphiphilic 4-helix bundle peptides via specific axial histidyl ligation of the metal. The bundle's designed amphiphilicity enables vectorial orientation o…
Using a variety of computational techniques, I investigate how the self-assembly of complex mixtures can be guided by surfaces or external stimuli to form spatially regular or temporally periodic patterns. Focusing on mixtures in confined geometries, I examine how thermodynamic and hydrodynamic effects can be exploite…
Magnetic Fe nanoparticles less than 1 nm have been successfully filled in single-walled carbon nanotubes (SWNTs), and their magnetic properties are characterized by means of SQUID measurements in the temperature range of 5-300 K.
Abstract DSC (differential scanning calorimetry) is one of the most commonly applied thermal stability testing methodologies in reactive chemicals hazard evaluation. This is certainly because of many factors, including the relative low cost of the equipment, rapid turnaround time of experiments, small sample size, eas…
Carbon nanotube electrochemical transistors integrated with microfluidic channels are utilized to examine the effects of aqueous electrolyte solutions on the electron-transport properties of single isolated carbon nanotubes. In particular, pH and concentration of supporting inert electrolytes are examined. A systemati…
Novel selenidoantimonate compounds [M(dien)2]2Sb4Se9 [M = Mn (1), Fe (2)], [Co(dien)2]2Sb2Se6 (3), and [Ni(dien)2]2Sb2Se5 (4) (dien = diethylenetriamine) were solvothermally synthesized and characterized. The unique features of compounds 1-3 are the mixed-valent anionic structures constructed by the Sb(III)Se3 trigona…
Large plate‐like Na 0.5 Bi 0.5 TiO 3 (NBT) templates have been successfully synthesized from bismuth layer‐structured ferroelectric Na 0.5 Bi 4.5 Ti 4 O 15 (NBIT) particles by the topochemical method. Because of the highly anisotropic structure, plate‐like NBIT particles were first synthesized by the molten‐salt proce…
Polymer multilayered films were assembled onto planar and particle substrates by the alternate adsorption of oppositely charged polyelectrolytes. Removal of the template from the coated melamine formaldehyde (MF) particles yields hollow polyelectrolyte capsules. The changes in morphology and chemical structure of the…
We report on the deposition of nanoparticles onto polymeric surfaces by use of a multiple hydrogen bonding interaction. Main interest concerned the preparation of statistical copolymers with a defined number of interactions within the side chain, thus enabling control of the number of supramolecular interactions prese…
Relative permittivities ranging from 12 to 100 were obtained from porous titania. Relative permittivities from 8 to 30 were obtained from porous calcium magnesium titanates. Porosity was introduced as microporosity by partial sintering, as 15 μm diameter spherical pores with porogens, and by fabrication of a microcell…
We present a rare‐earth‐doped ZnO ceramic with nonohmic electrical properties. Analysis of the microstructure and composition indicates that the ceramic is composed of the main phase of ZnO and the second phase of rare‐earth oxides (e.g., Dy 2 O 3 , Pr 6 O 11 , Pr 2 O 3 ). The average grain size is markedly increased…
In an effort to improve polymer thermal conductivity (TC), Ultem TM 1000 was compounded with nano-fillers of carbon allotropes. As-received and modified multiwalled carbon nanotubes (MWCNTs), vapor-grown carbon nanofibers (CNF) and expanded graphite (EG) were investigated. Functionalization of MWCNTs was performed to…
Stacked cone carbon nanotubes (SC-CNT) with a BET surface area of ∼280 m 2 /g were used as the support medium to prepare Pt catalysts for partial dehydrogenation of tetralin and decalin to produce pure hydrogen and naphthalene. The results show that for dehydrogenation of tetralin at 240 °C, 1.0 wt % Pt/SC-CNT is more…
Ultra‐high purity alumina was sintered in hydrogen at temperatures ranging from 1325° to 2020°C. Normal grain growth was maintained in all samples and grain boundary mobilities were measured. The data represent the most complete measure of intrinsic grain boundary mobility for alumina grain growth currently available.…
We present a study of tetraphenylporphyrin composites formed with single-walled carbon nanotubes (SWNTs). Stable porphyrin/SWNT composite solutions were obtained by non-covalent bonding between the carbon nanotubes and conjugated tetraphenylporphyrin molecules. Transmission electron microscopy reveals porphyrin molecu…