Materials Literature
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Strain can affect the morphology of a crystal surface, and cause modifications of its reconstruction even when weak, as in the case of mechanical bending. We carried out calculations of strain-dependent surface free energy and direct bending simulations demonstrating the change of incommensurate reconstruction in Au(1…
Abstract Proposed single molecule surface‐enhanced Raman scattering (SM‐SERS) mechanisms are discussed and problems in SM‐SERS of biological molecules are pointed out. It is unlikely that the single molecule signals can be explained exclusively by electromagnetic (EM) ‘hot spots’ in fractal structures or in narrow gap…
This contribution explores the relation between molecular second hyperpolarizabilities (gamma) and molecular architecture in phenylacetylene dendrimers using the semiempirical molecular orbital method, that is, INDO/S method. The orientationally averaged gamma of a large-size phenylacetylene dendrimer, which is compos…
Colloidal gold nanocrystals have been used to develop a new class of nanobiosensors that is able to recognize and detect specific DNA sequences and single-base mutations in a homogeneous format. At the core of this biosensor is a 2.5-nm gold nanoparticle that functions as both a nano-scaffold and a nano-quencher (effi…
Abstract The synthesis by plasma and characterization of aniline–pyrrole bilayer polymers doped in situ with iodine were studied. The objective was to study the electrical conductivity of thin films composed of alternating layers of different polymers. The results indicated that the plasma technique is capable of form…
The molecular conductor ${\ensuremath{\beta}}^{\ensuremath{'}}\ensuremath{-}({\mathrm{CH}}_{3}{)}_{4}\mathrm{As}[\mathrm{Pd}(\mathrm{dmit}{)}_{2}{]}_{2}$ (dmit=1,3-dithiol-2-thione-4,5-dithiolate) is a two-dimensional system based on the dimer structure. At low temperature, this system is a Mott insulator under ambien…
The role of an initiator (perfluorooctane sulfonyl fluoride, PFOSF) in the polymerization of 1,3,5-trivinyl-1,3,5-trimethylcyclotrisiloxane (V 3 D 3 ) by hot-filament chemical vapor deposition has been demonstrated. Use of the initiator allows rapid deposition of films at significantly lower filament temperatures. Pol…
Hybrid materials constituted by polypyrrole doped with the polyoxometalate (POM) anion [SiCr(H 2 O)W 11 O 39 ] 5- were electrogenerated from acetonitrile solutions. The electrochemical behavior of the hybrid films was studied by cyclic voltammetry in three different electrolytes formed by two anions and two cations, d…
The compounds N -phenyl-4-(10-methoxy-9-anthracenylethynyl)phthalimide ( 1 ), N -phenyl-4-(4-methoxy-1-naphthylethynyl)phthalimide ( 2 ), and N -phenyl-4-(4-benzonitrileethynyl)phthalimide ( 3 ) were synthesized to probe the effect(s) of electronic subsituents on the thermal curing of aryl−ethynyl end-capped oligomers…
Polytetrafluoroethylene (PTFE) thin films were prepared from pressed powder pellets via pulsed laser deposition by using ArF (193 nm) excimer laser. The applied laser fluences were in the 1.6-10 J cm -2 range, the substrate temperature was varied between 27°C and 250°C and post-annealing of the films was carried out i…
Stress relaxation dynamics in a series of star/linear 1,4-polybutadiene blends with fixed star-arm molecular weight M a, variable linear polymer molecular weight M L, and variable star polymer volume fraction φ s are investigated. Storage and loss moduli, G ‘(ω) and G ‘ ‘(ω), obtained from small amplitude oscillatory…
This paper presents a general method for fitting interatomic potentials to partial pair correlation functions that can be obtained from diffraction experiments on pure materials or alloys. We apply this new approach to the specific case of embedded atom method-type interatomic potentials and demonstrate that it can be…
The relationship between the breakdown electric field E B (electric field corresponding to the current density 1 mA cm -2 ) and thickness d for three types of Zinc oxide (ZnO) varistors were investigated. The geometric dimensional effect, observed in these varistors, is referred to as the responsible parameter for the…
Gels of syndiotactic polystyrene with different solvents have been compared to clathrates. Wide-angle X-ray diffraction results using toluene (good solvent for sPS) and decalin (relatively poor solvent for sPS) show that the structure of the crystalline junctions of the gels is similar to that of the clathrate δ-phase…
Abstract The aim of this research was to explore the effect of shear‐controlled orientation injection molding (SCORIM) on polybutene‐1 (PB‐1). This article describes the methods and processing conditions used for injection molding and discusses the properties of the moldings. Both conventional and SCORIM have been use…
Vanadium-substituted mesoporous molecular sieves (MCM-41) were prepared and the effects of water concentration, anti-foaming agent addition, pH adjustment, and Si/surfactant mole ratio were investigated. The hydrothermal and mechanical stability were tested for the pH-adjusted sample (Si/surfactant = 3.67 and 7.34). C…
Electron spin resonance (ESR) measurements were performed on nitrogen-free diamond films grown by chemical vapor deposition and on diamond single crystals, irradiated by ${}^{17}\mathrm{O}$ ions and annealed in the temperature range $100--1400\ifmmode^\circ\else\textdegree\fi{}\mathrm{C}.$ For those annealed in the ra…
An amorphous $2\mathrm{CdO}\ensuremath{\cdot}{\mathrm{GeO}}_{2}$ thin film with a band gap of 3.4 eV can be converted from an insulator (conductivity $\ensuremath{\sim}{10}^{\ensuremath{-}9}{\mathrm{S}\mathrm{}\mathrm{cm}}^{\ensuremath{-}1})$ into a degenerate semiconductor $(\ensuremath{\sim}{10}^{2}{\mathrm{S}\mathr…
A large number of new liquid crystals incorporating the 2,5-disubstituted thiophene ring have been prepared and their mesomorphic behaviour studied in order to systematically investigate the correlation between the molecular structure and mesomorphism of thiophene derivatives with different shapes, polarisability and…
Thermoplastic vulcanizates (TPVs), as prepared by dynamic vulcanization, are blends in which cross-linked rubber particles are finely dispersed in a thermoplastic matrix. The reported nylon-6/EPDM TPVs show significant strain recovery behavior, even though the matrix consists of semicrystalline nylon-6, which deforms…