Materials Literature
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Starting from a multipole expansion of intra- molecular Coulomb interactions, we present configuration interaction calculations of the molecular energy terms of the hole configurations hu^m, m=2-5, of C60^{m+} cations, of the electron configurations t1u^n, n=2-4, of the C60^{n-} anions, and of the exciton configuratio…
The path probability method (PPM) in the tetrahedron-cactus approximation is applied to the Slater-Takagi model with dipole-dipole interaction for KH2PO4-type hydrogen-bonded ferroelectric crystals in order to derive a small dip structure in the real part of dynamical susceptibility observed at the transition temperat…
We examine the alignment of thin film diblock copolymers subject to a perpendicular electric field. Two regimes are considered separately: weak segregation and strong segregation. For weakly segregated blocks and below a critical value of the field, E c, surface interactions stabilize stacking of lamellae in a directi…
The effect of the addition of CeO 2 on the structural and textural properties of TiO 2 and TiO 2 −CuO samples calcined at different temperatures was analyzed. The structural and textural transformation when the temperature of calcination was varied was followed by X-ray diffraction, Raman spectroscopy, and N 2 adsorpt…
We prepared novel transition-metal (Ti, Ta, V) oxide fibers with chiral, helical, and nanotubular structures. The nanostructured metal oxide materials were provided by the sol-gel polymerization of metal alkoxides using chiral self-assemblies of organogelators as structure-directing agents. The chiral structures of th…
The effects of strain rate, temperature and stress triaxiality on strength and ductility are studied for the three structural steels Weidox 460 E, Weldox 700 E and Weldox 900 E. The material properties are obtained from three types of tensile tests: quasi-static tests with smooth and notched specimens, quasi-static te…
Brushes of poly(ε-caprolactone) are grown by ring-opening polymerization from initiators immobilized on gold surfaces with nanometer-scale topography. Control of the thicknesses of the brushes can be exploited to tune the effect of the underlying nanometer-scale topography on the orientations of supported liquid cryst…
Abstract Blends of isotactic (natural) poly(3‐hydroxybutyrate) (PHB) and poly(methyl methacrylate) (PMMA) are partially miscible, and PHB in excess of 20 wt % segregates as a partially crystalline pure phase. Copolymers containing atactic PHB chains grafted onto a PMMA backbone are used to compatibilize phase‐separate…
The behavior of a solution of equilibrium polymers (or living polymers) at an interface is studied, using a Bethe-Guggenheim lattice model for molecules with orientation dependent interactions. The density profile of polymers and the chain length distribution are calculated. For equilibrium polymers at a nonadsorbing…
Conventional reflective displays based on either color filter/polarizer or stacked color layers suffer from their marginal performance in terms of brightness, color, and cost. In this paper, we will present new full-color reflective display architecture: Electrically Tunable Color (ETC). In this display architecture,…
A simple synthetic route to a new poly(diallylammonium) salt functionalized by a styrene group is presented. This reactive polymer was employed for polyelectrolyte multilayer films using electrostatical layer-by-layer self-assembly, together with an inorganic polyanion, namely an exfoliated hectorite clay. To enhance…
Reaction enthalpies are calculated for the hydrogenation reactions of main group hydrides with the potential for multiple bonding, and thus the unsaturated character of these species is determined. In addition to the global minimum structures, which leave in some cases no hope for even a single E-E bond (E=Group 13, 1…
Abstract A pure unsaturated cyclic ester, 6,7‐dihydro‐2(3 H )‐oxepinone (DHO2), was prepared by a new synthetic route. The copolymerization of DHO2 with ϵ‐caprolactone (ϵCL) was initiated by aluminum isopropoxide [Al(O i Pr) 3 ] at 0 °C as an easy way to produce unsaturated aliphatic polyesters with nonconjugated CC…
One of the most important reactions used for room temperature vulcanization of elastomers, hydrosilylation, was investigated by end-linking samples of vinyl-terminated poly(dimethylsiloxane) (PDMS) with silanes having number-average functionalities of 3, 4, and 40−50. The reaction was monitored through SiH consumption…
We investigate the lateral diffusion of Human Serum Albumin−Fluorescein Isothiocyanate (HSA) adsorbed “on” or embedded “in” poly(sodium 4-styrenesulfonate)/poly(allylamine hydrochloride) (PSS/PAH) multilayers. Special attention is brought to the evolution of the diffusion coefficient with the surface HSA concentration…
A homologous series of guanidinium alkylbenzenesulfonates from ethyl to tetradecyl were synthesized and characterised. Their thermotropic polymorphism was investigated by polarizing optical microscopy, differential scanning calorimetry, and dilatometry. The structure of the smectic liquid crystal phases obtained at hi…
The power of supramolecular chemistry to solve problems in structural chemistry where conventional techniques such as NMR, UV, and IR spectroscopy failed is demonstrated in the differentiation of the syn- and anti-bis(capped porphyrin) isomers (obtained after condensation of a capped porphyrin monomer) by simple UV/Vi…
Transcription of organic templates into shapely inorganic materials is generally believed to occur because of charge or hydrogen bonding interactions between the template and the inorganic precursor; the formation of the inorganic material is always promoted by a catalyst present in solution. In this paper, we prove f…
The behavior of the third-order nonlinear dynamic dielectric susceptibility ${\ensuremath{\chi}}_{3}(\ensuremath{\omega})$ in relaxor ferroelectrics is investigated in the framework of the spherical random-bond--random-field model. It is shown that there are two distinct contributions to ${\ensuremath{\chi}}_{3}(\ensu…
Like spiral staircases connecting the floors of a building, twisted chiral organic “pillars” link hydrogen-bonded guanidinium sulfonate sheets and produce extended supramolecular helices (see picture) that wind through crystals with predictable three-dimensional architectures.