Materials Literature
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Fluorescence micropatterns of rhodamine dye were fabricated in silica/titania sol−gel films by photogeneration of gold nanoparticles. Local reduction of Au(III) ions included in the film enabled us to selectively embed the particles using UV irradiation with a photomask, pulse laser shot, or AFM-assisted reaction. Flu…
Six crystal structures of the core domain of integrase (IN) from avian sarcoma virus (ASV) and its active-site derivative containing an Asp64 --> Asn substitution have been solved at atomic resolution ranging 1.02-1.42 A. The high-quality data provide new structural information about the active site of the enzyme and…
A theory is developed for the hydrodynamic interactions of surfactant-covered spherical drops in creeping flows. The surfactant is insoluble, and flow-induced changes of surfactant concentration are small, i.e. the film of adsorbed surfactant is incompressible. For a single surfactant-covered drop in an arbitrary inci…
Bulky, open assemblies, prepared from the sequential adsorption of oppositely charged polyelectrolytes (PE), could potentially be used as receptor matrixes in biosensing devices. We have examined the building of such structures onto gold surfaces from water-soluble cationic and anionic polyelectrolytes of different ch…
The new complexes 1,1‘-bis(5-(2,2‘-bithienyl))ferrocene ( 2 ) and 1,1‘-bis(5-(2,2‘:5‘,2‘ ‘-terthienyl))ferrocene ( 3 ) have been synthesized by coupling 1,1‘-bis(2-thienyl)ferrocene ( 1 ) with 2-bromothiophene and 5-bromo-2,2‘-bithiophene, respectively. The cyclic voltammograms of 1 − 3 contain a reversible Fe II/III…
We have examined the abilities of five structurally simple molecules to form thermoreversible gels with a variety of organic liquids. Each gelator is an acyclic alkane with one heteroatom. Of these, dioctadecylamine ( 2N ) is the most efficient gelator. At ≅3 wt % concentrations, it forms gels with alkanes, aromatic l…
Fourier transform infrared reflection absorption spectroscopy with the attenuated total reflection technique (ATR-FTIR), coupled with cyclic voltammetry (CV) measurement, is used to observe the oxidation process of adsorbed CO at Pt film sputtered on a silicon prism. The interesting bipolar shape of the linearly bonde…
The yield conditions for the gravitational displacement of three-dimensional fluid droplets from inclined solid surfaces are studied through a series of numerical computations. The study considers both sessile and pendant droplets and includes interfacial forces with constant surface tension. An extensive study is con…
Novel molecular electron donor−acceptor (DA) dyads, composed of a phytochlorin donor and a [60]fullerene acceptor, have been photochemically characterized. In these dyads, a pyrrolidine spacer group links the chlorin and the C 60 moieties covalently, forming a rigid dyad with a short and almost constant D−A distance.…
The synthesis of high-performance polymers requires a high level of control over the product9s morphology and hence its macroscopic properties. Kageyama et al . (page 2113) introduce a method that may make it easier to achieve such control over polymers made from simple starting materials. Nanoreactors within a mesopo…
In this paper, an organic−inorganic composite film of heteropolyanion was formed by attaching a Keggin-type heteropolyanion, SiW 12 O 40 4 -, on carbon electrode surface derivatized by 4-aminophenyl monolayer. The composite film thus grafted on carbon electrode surface has good stability because of the ionic bonding c…
The attachment of mesogens as end groups to hyperbranched polyglycerol (degree of polymerization 22-45; see schematic representation, the rigid mesogens are shown as rods and the flexible alkyl chains as lines) leads to liquid crystalline polymers with narrow polydispersity, whose liquid crystalline behavior is induce…
Nonlocal density functional theory (DFT) calculations were performed to analyze the di-σ, π, and atop chemisorption modes of maleic anhydride on the close-packed Pd(111), Re(0001), and pseudomorphic monolayers of Pd on Re(0001) [Pd ML /Re(0001)] and Pd on Mo(110) [Pd ML /Mo(110)] surfaces. The DFT-computed binding ene…
We present polarized two-photon excitation (TPE) spectra, including Zeeman data, for europium(III) in the elpasolites Cs 2 NaEuCl 6 and Cs 2 NaYF 6 :Eu 3+ . Approximately 80 and 60 levels of unambiguous symmetry have been assigned respectively in each compound up to 32 000 cm -1 with the aid of a one-electron crystal…
The effect of bulk viscosity on the evolution of the spatially flat Friedmann–Lemaitre–Robertson–Walker (FLRW) models in the context of open thermodynamical systems, which allow for particle creation, is analysed within the framework of Brans–Dicke (BD) theory. The BD field equations are modified with the incorporatio…
Malignant tumours often induce a fibroproliferative response in the adjacent stroma, characterized by increased expression of type I and type III procollagens. In normal tissues, fibrillar collagens normally undergo extensive intermolecular cross-linking that provides tensile strength to the tissue. Here we set out to…
The oxidative electron-transfer properties of several superphane complexes consisting of cyclopentadienylcobalt cyclobutadiene moieties linked by either three (compounds 1 and 4 ) or five (compounds 2 and 5 ) bridging methylene groups have been studied by experimental and theoretical methods. In both cases two separat…
While numerous fundamental studies have sought to elucidate the effect of a parent homopolymer on the morphological characteristics and mechanical properties of microphase-ordered block copolymer blends, few comparable efforts have extended such studies to concentrated copolymer solutions in the presence of a low-mola…
A single, amide-functionalized EDT-TTF core is expressed into markedly different and unprecedented stoichiometries and structures with contrasted collective electronic properties (uniform chain of spins versus two-dimensional metallic character) when associated with isosteric monoanions of different symmetries (Oh vs.…
Symmetry, dimensionality, and disorder play a pivotal role in critical phenomena. The atomic imaging capabilities of the scanning tunneling microscope were used to directly visualize the interaction between charge density oscillations and lattice defects in a two-dimensional charge density wave (CDW) system. Point def…