Materials Literature
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The total biological synthesis of CaCO 3 crystals of the metastable vaterite polymorph at room temperature by simple protein-mediated reaction of aqueous Ca 2+ ions with the CO 2 generated during the root growth from germinating chickpea ( Cicer arietinum ) seeds is described. Highly stable vaterite crystals of spheri…
On binding to human serum albumin (HSA), the Eu(III) luminescent emission enhancement of a complex containing a binaphthyl chromophore enables the determination of binding constants, showing no chiral discrimination for the (R)- (K= 8200 +/- 810 M(-1)) and (S)-enantiomers (K= 7710 +/- 460 M(-1)).
The first incorporation of quinacridone, a technologically important organic electroluminescent emitter, into dendrimers increases solubility, decreases aggregation, retards heterogeneous electron transfer, and enhances luminescence in condensed phases (powders and thin films).
Water is a unique liquid, many of whose properties are critical for the continued support of life. In living systems, essential water-related phenomena occur in restricted geometries in cells, and at active sites of proteins and membranes or at their surface. The stability of biological systems is controlled by the su…
High-capacity sulfur dioxide absorbents based on manganese oxide octahedral molecular sieves (OMS) have been identified. These materials are based on MnO 6 octahedra sharing faces and edges to form various tunnel structures (2 × 2, 2 × 3, 2 × 4, 3 × 3) differentiated by the number of octahedra on a side. The SO 2 capa…
The intercalation of hexacyanoferrate(III) in chloride-hydrotalcite was studied as a function of the composition of the equilibrated aqueous phase, the relevant solution variable being the ratio (C(Fe(CN)(6)(3-))(1/3)/C(Cl)-. The isotherm shows that the exchange is markedly nonideal and reveals the segregation of two…
Measurements of magnetization M ( T , H ), heat capacity C ( T ), NMR lineshift K ( T ) and linewidth Δ( T ), neutron scattering S ( Q , ω, T ) and broadband dielectric spectroscopy (ω, T ) provide experimental evidence of the different orbital ground states in the cubic sulfur spinels under investigation. In all comp…
Two polypyridyl ruthenium complexes containing either a terminal pyridine or phenanthroline group have been used to coat silver nanoparticles and control their size depending on the Ag/[RuII] ratio.
Carbon nanotube thin films with ordered structures have been developed from a highly concentrated suspension of nanotubes; this is shown to be an attractive approach to fabricating electrodes for high power density supercapacitors.
The one-electron oxidation of N,N′,N″,N‴-tetraneopentyl-2,5-diamino-1,4-benzoquinonediimine 3 has been carried out using Ag(I) as an oxidising agent and led to the formation of the postulated nitrogen-based radical cation B. This unstable species can evolve by following two competing pathways, either a hydrogen atom a…
Proton controlled intramolecular PET from an aniline moiety to a squaraine chromophore, attached to podand chains is reported, which to our knowledge is the first example where a squaraine dye is involved as an electron acceptor in an intramolecular PET process, and has implication in the design of PET based sensors.
The synthesis of perylene and terrylene chromophores carrying a single poly(ethylene oxide) chain is presented. These chromophores reveal a strong solvatochromic behavior: High fluorescence in nonpolar solvents and weak fluorescence in polar solvents which is mainly attributed to aggregation. Therefore, such chromopho…
The fabrication of organic–inorganic hybrid nanotubes organized into concentric layers is described. Self-assembly of glycolipids inside the confined nanospace of hollow cylindrical silica nanotubes produced a hybrid nanotube consisting of two concentric layers, one of silica and one of lipid. Addition of glucopyranos…
The crystal structure of Ba2LaTi2Nb3O15 was determined using high resolution powder neutron diffraction data collected at 100 K and 400 K. Both structures, refined in space groups P4bm (100 K) and P4/mbm (400 K), are closely related tetragonal tungsten bronzes with Ba in large 15-coordinate sites, La in 12-coordinate…
Chlorins/oxochlorins bearing distinct patterns of substituents are valuable compounds in bioorganic and materials chemistry. Treatment of a 5,10-diaryl-substituted chlorin or oxochlorin with TFA-d(1) resulted in selective deuteriation of the remaining meso positions (15, 20) rather than any of the beta-pyrrolic positi…
The non-emissive supramolecular assembly of urea end-capped oligo(p-phenylenevinylene) flourophores turned strongly emissive in the presence of tetrabutylammonium flouride which has implications in the anion controlled design of supramolecular architectures with tunable emission properties.
Oilfield formation damage by scale formation can occur when two incompatible brine streams are mixed. A common method for preventing scale formation is the use of chemical scale inhibitors such as aminotri(methylene phosphonic acid) (ATMP). Scale inhibitors are injected and retained in the reservoir by adsorption and/…
The energies of zinc-blende and rocksalt structures FeN and CoN were calculated as function of lattice constant using the local density approximation and generalized gradient approximation density functional methods and the linear muffin-tin orbital band-structure method. The zinc-blende structure is found to be prefe…
We derive an expression for the free energy of the blends of block copolymers expressed as a functional of the density distribution of the monomer of each block. The expression is a generalization of the Flory−Huggins−de Gennes theory for homopolymer blends and also a generalization of the Ohta−Kawasaki theory for the…
Mesostructured thin films of CeO2, ZrO2and CeO2–ZrO2 mixed oxides with highly crystalline pore walls and ordered arrays of mesopores were obtained by a straightforward fabrication process employing evaporation-induced self-assembly (EISA) and a well-designed temperature treatment, taking advantage of a novel type of a…