Materials Literature
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There is great interest in using single-walled carbon nanotubes (SWNTs) as nanoscale probes and sensors in biological electronics and optical devices because the electronic and optical properties of SWNTs are extremely sensitive to the surrounding environments. A well-controlled modification of SWNT surfaces may provi…
A pH above 9.0 was essential for the formation of wurtzite zinc oxide (ZnO) in aqueous solution systems. The addition of complexing agents to decrease the deposition rate was required for the direct growth of ZnO on the surface of substrates through heterogeneous nucleation. The nucleation of the crystals was promoted…
Electrospun fibers were produced using a variety of solvents to investigate the influence of polymer/solvent properties on the fiber surface morphology. Electrospinning is a novel processing technique for the production of fibers with diameters in the range of a few nanometers to tens of micrometers. We have been able…
PbSeTe-based quantum dot superlattice structures grown by molecular beam epitaxy have been investigated for applications in thermoelectrics. We demonstrate improved cooling values relative to the conventional bulk (Bi,Sb)2(Se,Te)3 thermoelectric materials using a n-type film in a one-leg thermoelectric device test set…
We report a technique devised to evaluate the effects of partial proteolysis on the mechanical characteristics of acellular non-cross-linked fibrin clots. The destruction technique applies coaxial tension on mechanically preconditioned cylindrical molded clots and measures the number of mechanical failures vs the tota…
Diffusion has a central role in protein crystal growth both in microgravity conditions and on ground. Recently several reports have been focused on the importance to use the generalized Fick's equations in n-component systems where crystals grow. In these equations the total flux of each component is produced by the o…
Two crystallographic forms of lysozyme nitrate are known, namely monoclinic and triclinic. Having previously determined the temperature dependence of the solubility of the monoclinic form (0.2 M NaNO (3) solutions at pH = 4.5) [Legrand et al. (2001). J. Crystal Growth 232, 244-249], we focus here on the solubility of…
In a classical vapor diffusion crystallization, the protein solution is mixed in a 1:1 ratio with the reservoir solution, containing one or more precipitant species, after which the two are placed in an enclosed chamber. As the vapor pressure is lower for the reservoir solution, due to its higher solute concentration,…
We calculate the lattice phonons and the electron-phonon coupling of the organic superconductor $\ensuremath{\kappa}\ensuremath{-}(\mathrm{B}\mathrm{E}\mathrm{D}\mathrm{T}\ensuremath{-}\mathrm{T}\mathrm{T}\mathrm{F}{)}_{2}{\mathrm{I}}_{3},$ reproducing all available experimental data connected to phonon dynamics. Low-…
The vanadium dioxide (VO2) thin film, usually employed as an infrared detector, exhibits hysteresis in its resistance-temperature characteristic. Considering a polycrystalline VO2 thin film as a composite medium, containing semiconducting and metallic microcrystals, the well- known effective-medium approximation theor…
The influence of an external field acting differently on the two constituents of a binary colloidal mixture performing Brownian dynamics is investigated by computer simulations and a simple theory. In our model, half of the particles (A particles) are pulled by an external force ( A ) while the other half (B particles…
We developed a method to visualize the curved surfaces of valence band dispersion by a display-type spherical mirror analyzer. The π and σ band “surfaces” of graphite measured and displayed three dimensionally contain fruitful information compared to the conventional band dispersion “curves” along a certain direction…
Epitaxial (Al,Ga,Mn)As films were prepared by low-temperature molecular-beam epitaxy and their magnetic properties were investigated. The Mn composition was fixed at approximately 0.05 while Al composition was varied up to 0.30. The results of magnetization and transport measurements for high Al composition samples sh…
Ferrohogbomite-2 N 2 S is a polysomatic hogbomite-group mineral composed of two nolanite modules ( N ) and two spinel modules ( S ) where the spinel modules have ideally hercynite composition. Ferrohogbomite has been described in the literature for a long time but was not distinguished from magnesiohogbomite and simpl…
Abstract The vibrational spectra of palladium phthalocyanine (PdPc) evaporated thin solid films are reported, including the resonance Raman scattering, surface‐enhanced resonance Raman scattering (SERRS) and SERRS mapping of the film surface using micro‐Raman spectroscopy with 633 nm laser radiation. SERRS of PdPc was…
A molecular theory to determine thermodynamic properties of isotropic and nematic phases of liquid crystals is proposed, based on a “convex peg” model and semiempirical PM3 (Parametrized Method 3) calculations. The Helmholtz-free energy of the molecular system, a convex hard core within an encircling spherical square-…
The ability of dextran (513 000 Da) with pendant acetaldehyde groups to increase the wet strength of filter paper was evaluated as a function of the aldehyde content, impregnation pH, and temperature. The impregnation of filter paper with dextran aldehyde increased the wet tensile strength. By contrast, neither dextra…
The nucleation of horse spleen ferritin (HSF) crystals on substrates was investigated using a new modification of the double pulse technique. The influence of three different structureless substrates (glass, glass covered by methyl groups and poly-L-lysin template) on the nucleation was studied. The boundaries in the…
By using a supersaturation gradient along a protein solution contained in a glass capillary tube, we modified the classical double pulse technique, thus substantially accelerating the procedure of measurement of nucleation parameters. Data for the number of crystal nuclei, n vs nucleation time, t, were obtained for he…
The electronic structures of charged carbon nanotube cluster models were calculated with the density-functional-theory (DFT) method. With the increasing number of extra electrons, (a) a potential barrier is formed near the tube wall; its height increases and the width at the highest occupied molecular-orbital (HOMO) l…