Materials Literature
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Abstract The influence of relative humidity (RH) during the film preparation on the surface morphology and on the material distribution of the resulting technical polymer blend films consisting of poly (methyl methacrylate) (PMMA) and poly (vinyl butyral) (PVB) is investigated by atomic force microscopy. Both pure pol…
The spectral width, or $\ensuremath{\gamma}$ value, of the Raman excitation profile for single-wall carbon nanotubes is calculated by evaluating the lifetime of the carriers. The calculated results for the $\ensuremath{\gamma}$ values are compared with the experimental spectral width of the Raman excitation profile. T…
Structure, photoabsorption, and excited states of a covalently bonded porphyrin-fullerene dyad H(2)P-O34-C(60) are studied using DFT and TD-DFT approaches. Charge transfer from the donor (porphyrin) to the acceptor (fullerene) and the excited-state geometrical relaxation are of special interest. An analysis of differe…
The R ‐curve and stress–strain behaviors in a variety of ferroelastic polycrystalline ceramic compositions are investigated and compared. These include soft and hard compositions of Pb(Zr,Ti)O 3 , Na 0.5 Bi 4.5 Ti 4 O 15 , PbNb 2 O 6 , PbTiO 3 , and Pb(Mg 1/3 Nb 2/3 )O 3 –Pb(Zr,Ti)O 3 . The fracture toughness enhancem…
We present an EPR study of two Gd(III) complexes in aqueous solution at multiple temperatures and EPR frequencies. These two complexes, [Gd(TPATCN)] and [Gd(DOTAM)(H(2)O)](3+), display remarkably sharp lines (i.e. slow transverse electron spin relaxation) in comparison with all complexes studied in the past, especiall…
Interactions of succinic acid (SUC) with the {104} cleavage faces of calcite show a strong preference in crystallographic directions. In situ atomic force microscopy revealed that the morphology of etch pits on the crystal surfaces experienced a transition from the common rhombus to a hexagon upon the introduction of…
The effects of RuO(x) structure on the selective oxidation of methanol to methyl formate (MF) at low temperatures were examined on ZrO(2)-supported RuO(x) catalysts with a range of Ru surface densities (0.2-3.8 Ru/nm(2)). Their structure was characterized using complementary methods (X-ray diffraction, Raman and X-ray…
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…