Materials Literature
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We have performed Monte Carlo simulations to reproduce the intrinsic viscosity corresponding to different generation of several types of dendrite molecules: polyamidoamine dendrimers with an ethylendiamine core, polypropylene-imine with a diaminobutane core, and monodendrons and tridendrons of polybenzylether. With th…
Crystal growth of inorganic materials, calcium carbonate, barium sulfate, and calcium oxalate, was studied in the presence of calix[4]arene additives functionalized with aspartic or glutamic acids at the lower rim. The additives were synthesized by reaction of the appropriate amino acid ester with 5,11,17,23-tetra- te…
To study molecules able to act as good "molecular wires", intramolecular electron transfer between two triphenylmethyl redox centers connected by bridges with different topologies and substituents have been studied in solution, both by UV-Vis-NIR and EPR spectroscopies. The synthetic methodology used allows a complete…
The interaction of streptavidin (SA) with a biotinylated surface has been of great interest in the development of an interfacial layer for protein immobilization based on self-assembled monolayers (SAMs) and polymeric layers. Here, we demonstrate the unique characteristics of protein-ligand interactions on dendrimer m…
In a series of ferroelastic urea inclusion compounds (UICs), in which domain reorientation occurs upon application of an external anisotropic force, introduction of a relaxive impurity that disrupts a specific hydrogen-bonding network transforms a plastic (irreversible) domain-switching process into one that exhibits…
Abstract In supramolecular systems, the interaction between different units modulates their photophysical properties. a) For platinum( II ) complexes with ligands that have extended π systems, π‐stacking and direct metal–metal interactions result in the formation of excimers with characteristically red‐shifted lumines…
We analyse the possible phase diagrams of a simple model for an associating liquid proposed previously. Our two-dimensional lattice model combines orientational ice-like interactions and `van der Waals' interactions which may be repulsive, and in this case represent a penalty for distortion of hydrogen bonds in the pr…
The subphase for the temperature range that lies in between $\mathrm{Sm}\text{\ensuremath{-}}{C}_{A}^{*}$ and the three-layer $\mathrm{Sm}\text{\ensuremath{-}}{C}_{A}^{*}(1∕3)$ subphase has been confirmed to exist using the measurements of electric-field-induced birefringence, optical rotation, and the characteristic…
Two new polymorphs of BiB3O6 were identified at low temperatures using boric acid as a flux. Unlike alpha-BiB3O6, which crystallizes in a noncentrosymmetric space group and, thus, shows exceptional nonlinear optical (NLO) properties, beta-BiB3O6 (I) and gamma-BiB3O6 (II) crystallize in the centrosymmetric space group…
Several paired, localized gap states were observed in semiconducting single-wall carbon nanotubes using spatially resolved scanning tunneling spectroscopy. A pair of gap states is found far from the band edges, forming deep levels, while the other pair is located near the band edges, forming shallow levels. With the h…
Abstract Two types of fluoride and oxide systems belonging to the heavy metal glass family have been studied. From absorption and emission spectra together with Judd–Ofelt analysis, spectroscopic parameters of Eu 3+ ions in both optical systems were evaluated and compared. The new oxide glassy system based on PbO–B 2…
The crystal structure and luminescence properties of hydrothermally grown crystals of Cs 3 EuSi 6 O 15 are reported. The structure consists of loop-branched vierer double chains of silicate with four-, six-, and eight-membered rings, which are connected via 10-membered rings at their interfaces to form a 3-D silicate…
Epitaxial ferroelectric-ferromagnetic field effect devices of PbZr0.52Ti0.48O3∕La0.7Sr0.3MnO3 (PZT∕LSMO) with narrow manganite channels (⩽7nm) show butterflylike hysteretic resistance modulations (ΔR) which are commensurate with strain variation from inverse piezoelectric effect of PZT. Based on the type of observed r…
We extend the analysis of a mean-field model for biaxial liquid crystals recently proposed by Sonnet et al. [Phys. Rev. E 67, 061701 (2003)]. In particular, we perform a bifurcation analysis of the equilibrium equations and derive the complete phase diagram. We show that two order parameters suffice to label all equil…
Random layer: Multicomponent organic solid solutions were obtained by treating equimolar mixtures of two or more aliphatic carboxylic acids with 1-naphthylmethylamine (NMA; see scheme). The single sharp XRD peaks of the crystalline products indicate specific pairing of alkyl groups between the NMA layers to form mixed…
The photochemical properties of a series of newly synthesized dendrimers, 4-6, having a 2-(2'-hydroxyphenyl)benzoxazole (HBO) core, were studied in benzene. The fluorescence quantum yields (Phi(f)) were determined to be 0.022, 0.030, and 0.038 for 4, 5, and 6, respectively, increasing in higher generation dendrimers.…
Abstract Quasi‐aligned Eu 2+ ‐doped wurtzite ZnS nanowires on Au‐coated Si wafers have been successfully synthesized by a vapor deposition method under a weakly reducing atmosphere. Compared with the undoped counterpart, incorporation of the dopant gives a modulated composition and crystal structure, which leads to a…
Abstract 6,11,16,21‐Tetraaryl‐3‐aza‐ m ‐benziporphyrin, an analog of 5,10,15,20‐tetraarylporphyrin with one of the pyrrole units replaced by a pyridine ring pointing outwards, linked at β,β′ positions, was formed by condensation of 3,5‐bis[phenyl(2‐pyrrolyl)methyl]pyridine, pyrrole and p ‐tolualdehyde catalyzed by TFA…
The mussel adhesive protein Mefp-1, under physiological conditions, presumably has a self-avoiding random walk conformation with helix-like or turned deca-peptide segments. Such a conformation may coil up under osmotic pressure induced by surrounding macromolecules. As a consequence, the orientation of the 3,4-dihydro…
The demagnetization process of an exchange-coupled hard/soft/hard magnetic system and its coercivity mechanism are investigated within a micromagnetic framework. The calculation reveals that the demagnetization is a three-step process: (i) it begins with the nucleation of a transition region, (ii) the subsequent evolu…