Materials Literature
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In the present work, the adsorption of human serum albumin (HSA) on commercially pure titanium with a titanium oxide layer formed in a H(2)O(2) solution (TiO(2) cp) and on TiO(2) sputtered on Si (TiO(2) sp) was analyzed. Adsorption isotherms, kinetic studies, and work of adhesion determinations were carried out. HSA e…
We have performed terahertz time-domain spectroscopy of carrier-doped nanoporous crystal 12CaO7Al2O3 showing the Mott variable range hopping at room temperature. The real part of the dielectric constant clearly demonstrates the nature of localized carriers. The frequency dependence of both the real and imaginary parts…
To prepare composite films from biopolymers with anti-listerial activity and moisture barrier properties, the antimicrobial efficiency of chitosan-hydroxy propyl methyl cellulose (HPMC) films, chitosan-HPMC films associated with lipid, and chitosan-HPMC films chemically modified by cross-linking were evaluated. In add…
We study Mode I crack propagation in amorphous material via a molecular dynamics simulation of a binary alloy with pairwise central-force interactions. We find that when the system is subjected to constant displacement after introduction of a seed crack, the crack does not propagate. This was found to be true both for…
A home made DSP-controlled scanning probe microscope (SPM) system has been developed and its utilization as a tool for lithography on nanometer scale is reported. User-friendly graphic interface allows to directly perform nanolithography importing a bitmap pattern on previously-imaged sample region, otherwise moving i…
The effects of high concentration of point defects in crystalline $\mathrm{Zr}\mathrm{Si}{\mathrm{O}}_{4}$ as originated by exposure to radiation, have been simulated using first principles density functional calculations. Structural relaxation and vibrational studies were performed for a catalog of intrinsic point de…
The dominant mechanism for creating large irreversible strain in atomic crystals is the motion of dislocations, a class of line defects in the crystalline lattice. Here we show that the motion of dislocations can also be observed in strained colloidal crystals, allowing detailed investigation of their topology and pro…
Based on first-principles calculations, we suggest a method for fabricating $p$-type ZnO with group-I elements such as Li and Na. With group-I dopants alone, substitutional acceptors are mostly self-compensated by interstitial donors. In ZnO codoped with H impurities, the formation of compensating interstitials is sev…
The RCSB Protein Data Bank (PDB) has a number of options for deposition of structural data and has developed software tools to facilitate the process. In addition to ADIT and the PDB Validation Suite, a new software application, pdb_extract, has been designed to promote automatic data deposition of structures solved b…
The perovskites and perovskite-related structures exhibit several features of technical as well as fundamental interest. Technically useful properties include oxide-ion conduction with/without electronic conduction, oxidation catalysis, ferroic displacements in classic and relaxor ferroelectrics, half-metallic ferroma…
The mass density of proteins is a relevant basic biophysical quantity. It is also a useful input parameter, for example, for three-dimensional structure determination by protein crystallography and studies of protein oligomers in solution by analytic ultracentrifugation. We have performed a critical analysis of publis…
Abstract The effects of γ‐radiation on a low‐density polyethylene (LDPE) were investigated by novel techniques, such as crystallization analysis fractionation and preparative fractionation, to analyze and compare their performance with other analytical procedures such as DSC, FTIR, and GPC. The LDPE was thus irradiate…
Abstract As new ionic organic species for second‐order non‐linear optical (NLO) materials, 4‐{[4‐(dimethylamino)phenyl]ethynyl}phenyltrimethylammonium iodide ( 1a ), 4‐{[4‐(dimethylamino)phenyl]butadiynyl}phenyltrimethylammonium iodide ( 2a ) and their derivatives with 4‐substituted benzensulfonate instead of iodide w…
The magnetoelastic coupling of epitaxial MnAs films on GaAs(001) has been investigated with a sensitive cantilever beam magnetometer. We find that even at $10\phantom{\rule{0.2em}{0ex}}\ifmmode^\circ\else\textdegree\fi{}\mathrm{C}$, i.e., very close to the combined structural and magnetic phase transition from $\ensur…
Recent advances in technology have allowed for the identification of complex protein mixtures in a rapid fashion. This report highlights the use of 2D gel electrophoresis, mass spectrometry, and database analysis to determine contaminating species of the Escherichia coli genome that are present during immobilized meta…
Abstract The effect of a sodium ionomer (ion.Na + ) on the compatibility of polypropylene (PP)/high‐barrier ethylene–vinyl alcohol copolymer (EVOH) blends was studied in terms of the thermal, mechanical, and optical properties and morphology. The rheological behavior, tensile tests, and morphology of the binary blends…
Abstract Poly( L ‐lactide) (PLLA) with terminal primary amino groups (PLLA‐NH 2 ) was synthesized and used to construct PLLA‐grafted pullulan (Pul‐ g ‐PLLA). It consisted of a hydrophilic carboxymethyl Pul (CM‐Pul) main chain and hydrophobic PLLA graft chains that were created through a direct coupling reaction betwee…
We offer an alternative explanation---a parametric instability---to explain the experimental results on electromechanical vibrations of carbon nanotubes. A vertical carbon nanotube, rooted in a metal base, acts like a cantilever of natural frequency of transverse vibration ${\ensuremath{\omega}}_{R}={(48\phantom{\rule…
Abstract Polylactic acid (PLA) is a biodegradable aliphatic polyester that is suitable for use in many fields related to medical treatment. This article reviews the glass transition temperature (T g ), the biodegradable rate of PLA blended with collagen (Col), and its mechanical properties through tensile, bending and…
Ternary indium (III) pyrophosphates with three-dimensional frameworks of MInP 2 O 7 (M = Na, K, Rb, Cs) have been found, and the crystal structures have been first reported in this paper. The optical and bonding properties were investigated in terms of the absorption and emission spectra, as well as the calculated ban…