Materials Literature
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Fully reconfigurable hydrophobic–hydrophilic surfaces were achieved by reversibly adsorbing and removing avidin from a hydrophobic self-assembled monolayer. The adsorption process was characterized using surface plasmon resonance, while contact angle measurements were used to monitor the resulting wetting behavior. Th…
Previous Brownian dynamics (BD) simulations identified specific basic residues on fructose-1,6-bisphophate aldolase (aldolase) (I. V. Ouporov et al., Biophysical Journal, 1999, Vol. 76, pp. 17-27) and glyceraldehyde-3-phosphate dehydrogenase (GAPDH) (I. V. Ouporov et al., Journal of Molecular Recognition, 2001, Vol. 1…
The results of transmission electron microscopy and thermoluminescence (TL) studies in silica samples containing Fe and Cu nanosized particles show an important enhancement of their TL response when compared with known reports for pure silica samples. The effect of surface electronic states in the nanoparticles, inter…
The reaction between the arginine's guanidino group and α-dicarbonyl functionalities was used to develop a novel surface modification chemistry. The first modification step consists of the electrostatic adsorption of a poly- l -arginine layer onto ionizable alkanethiol modified gold surfaces. The strongly basic charac…
An outstanding example of structural diversity and complexity is found in the compounds with the general formula ABi(3)Q(5) (A = alkali metal; Q = chalcogen). gamma-RbBi(3)S(5) (I), alpha-RbBi(3)Se(5) (II), beta-RbBi(3)Se(5) (III), gamma-RbBi(3)Se(5) (IV), CsBi(3)Se(5) (V), RbBi(3)Se(4)Te (VI), and RbBi(3)Se(3)Te(2) (…
Electron paramagnetic resonance (EPR) measurements on pure polycrystalline CaCu 3 Ti 4 O 12 have been performed and are discussed within a crystal-field approach. A symmetric signal centred at g = 2.15 is observed for T >25 K, with no evidence of hyperfine structure. At this temperature an antiferromagnetic transition…
We report the synthesis of monomers, dimers, trimers, and oligomers of triple-decker (TD) complexes bearing S-acetylthio groups at the termini: AcS-(TD)(n)()-SAc. Each TD was of type (Pc)Eu(Pc)Eu(Por), where H(2)Pc = tetra-tert-butylphthalocyanine and H(2)Por is a meso-tetraarylporphyrin bearing functional groups at t…
Adequately substituted porphyrins can participate in pericyclic reactions as dienes, dienophiles, dipolarophiles and as 1,3-dipoles. They also show interesting dipolar 1,5-electrocyclizations and cheletropic reactions with carbenes. All these different types of reactivity have been exploited in order to synthesize new…
The segregation of native defects and Bi impurities to a high-angle grain boundary in ZnO is studied by first-principles calculations. It is found that the presence of Bi(Zn) increases the concentration of native defects of acceptor type in the grain boundary. This leads to the formation of a Bi(Zn)+V(Zn)+O(i) interfa…
Recently developed versatile biodegradable polymeric biomaterial offer new therapeutic options in numerous medical fields. Biocompatibility is a crucial requirement for the biomedical application of biomaterials, including the sterilization of these materials with the use of accepted protocols. Ethylene-oxide (EO) and…
Nonquasiparticle states above the Fermi energy are studied by first-principle dynamical mean field calculations for a prototype half-metallic ferromagnet NiMnSb. We present a quantitative evaluation of the spectral weight of this characteristic feature and discuss the possible experimental investigation (Bremsstrahlun…
Titanium and its alloys are the most suitable materials for structural biomaterials among metallic biomaterials. Nowadays, Pure Ti and Ti-6Al-4V ELI are the most widely used in the biomedical fields. However, for replacing failed hard tissue, the strength of pure Ti is not sufficient. For Ti-6Al-4V ELI, V has been poi…
Broadband dielectric spectroscopy is employed to investigate the molecular dynamics of cis-1,4-polyisoprene (PI) in thin layers down to thicknesses comparable with the chain extension. The segmental and the normal mode dynamics of the PI chains is found not to depend on the layer thickness. Additionally, a novel confi…
The crystal structure of the Escherichia coli lactose permease at 3.5 A with a bound substrate has been reported recently. The structure reveals the sugar-protein contacts, which include hydrophobic stacking between the galactopyranosyl ring of substrate and the indole side chain of Trp-151, as proposed previously. Th…
Metallic nanowires composed of nickel and gold as well as bimetallic nickel−gold nanowires were fabricated via templated electrodeposition in nanoporous alumina membranes. Gold surfaces were functionalized with alkanethiols with terminal hexa(ethylene glycol) groups (EG 6 ), while nickel surfaces were functionalized w…
Several types of six-armed, metal tris(bipyridine) core dendrimers were synthesized. Bis-4,4'-alkoxy bipyridine dendrons were prepared and employed to make tris(bipyridine) dendrimers. Although the ruthenium-centered and iron-centered dendrimers displayed quasi-reversible cyclic voltammetry, the analogous cobalt-cente…
Using X-ray scattering complemented by microscopic methods, we studied the alignment of a semicrystalline polymer isotactic polystyrene by crystallization in a high magnetic field (7 and 11 T). As reported previously, strong orientation of crystalline chain segments perpendicular to the magnetic field can be achieved.…
Structure and magnetic transitions were investigated by x-ray diffraction and Mössbauer spectroscopy in LaFe 13− x Si x compounds with x = 1.6, 2.0 and 2.6. With increasing Si content, the La–Fe interatomic distance decreased while the average Fe–Fe distance increased. These changes affect the structural stability and…
Abstract Hetero‐bimetallic Fe(II) alkoxide/aryloxides were evaluated as initiators for the ring‐opening polymerization of rac ‐lactide. [(THF)NaFe(O t Bu) 3 ] 2 ( 1 ) and [(THF) 4 Na 2 Fe(2,6‐diisopropylphenolate) 4 ] ( 2 ) (THF = tetrahydrofuran) both polymerized lactide efficiently at room temperature, with complex…
A series of cyano-bridged heterotrimetallic complexes [CuL](2)Ln(H(2)O)(2)M(CN)(6).7H(2)O have been synthesized by the reactions of CuL (L(2)(-) = dianion of 1,4,8,11-tetraazacyclotradecane-2,3-dione), Ln(3+) (Ln = Gd or La), and [M(CN)(6)](3)(-) (M = Co, Fe, or Cr). X-ray diffraction analysis reveals that these compl…