Materials Literature
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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.
Three color states and a large luminance change at intermediate potentials are the key features of a new alkylenedioxypolythiophene, in which two polymeric strands are linked by a spiro(bis-dioxacycloheptene) unit (see Figure). The seven-membered rings are quite flexible and allow coplanarity of both strands. The poly…
Three-coordinate 1 ∶ 1 and 1 ∶ 2 compounds of copper(I) halides with tricyclohexylphosphine have been synthesised and characterized by single crystal X-ray structure determinations, 63Cu NQR spectroscopy, solid state 31P CPMAS NMR spectroscopy, and low frequency vibrational spectroscopy. The 1 ∶ 1 compounds crystalliz…
The application of a Genetic Algorithm, for optimising the geometry of aluminium clusters with 21-55 atoms bound by the many-body Murrell-Mottram potential, is described. In this size regime, a number of different structural motifs are identified--face-centred cubic, hexagonal close packed, decahedral and icosahedral…
Direct decomposition of NO to N2 by rare earth oxides prereduced with H2 was studied. CeO2 and Pr6O11 prereduced at 773 K, in which many oxygen anion vacancies exist, decomposed NO to N2 at 673 K. The addition of Pt accelerated the dissociation of NO to N2. The amount of NO decomposed to N2 and N2O by Pt supported on…
A cholesteric mixture based on a menthyl-containing copolymer, photosensitive chiral dopant, mesogenic diacrylate, and photoinitiating agent has been prepared. The mixture shows a selective light reflection in the visible light spectral region. The action of UV irradiation (313 or 365 nm) on the planar-oriented films…
Helices auf Helices: Nanohelices aus polykristallinem Cadmiumsulfid (siehe elektronenmikroskopische Aufnahme) wurden durch Mineralisation in Gegenwart eines selbstorganisierten Templats hergestellt, das die Gestalt eines verdrillten Bandes aufweist. Die korkenzieherförmige Morphologie der anorganischen Helices resulti…
“Nanosecond” electrochemistry is used to study acoustically emulsified mixtures of aqueous electrolyte and smaller quantities of heptane. Significant current spikes of microsecond duration are observed under potentiostatic conditions and attributed to the impacting of heptane droplets onto the electrode surface. The p…
Poly(ethylene glycol) containing surfactant molecules were modified with titanium alkoxides. These surfactants were used in the synthesis of mesostructured silica−titania mixed metal oxide thin films serving two different functions: (a) as a structure-directing agent and (b) as a moderator of the hydrolysis rate of th…
The amphiphilic shape-persistent macrocycle 1 containing four phenol-OH groups as polar side groups and four hexyloxy groups as nonpolar side groups in an adaptable arrangement was recrystallized from solvents of different polarity. X-ray crystallography reveals that the conformation of the macrocycle is solvent depen…