Materials Literature
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This review summarizes the recent advances that have been performed on self-assembled inorganic systems, especially on helical systems, metallo-exoreceptors and on architectures formed from multiple components. In addition, applications as well as the perspectives for these designed systems are also discussed.
First examples of post-polymerization functionalization of poly(3,4-ethylenedioxythiophene) (PEDOT) derivatives are reported using tetrathiafulvalene (TTF) as a redox sensitive probe. EDOT derivatives bearing ω-iodo-alkyl or ω-iodo-polyether chains attached at the ethylenedioxy bridge have been electropolymerized and…
We have fabricated refractive sapphire microlenses and characterized their properties for what we believe to be the first time. We use thermally reflown photoresist lenslet patterns as a mask for chlorine-based dry etch of sapphire. Pattern transfer to the mechanically hard and chemically inert sapphire substrate is m…
Abstract Synthesis, structural characteristics, and optical and electrochemical properties of various meso–meso-linked porphyrin arrays were described. The AgI-salt-promoted meso–meso coupling reaction of 5,15-diaryl and 5,10,15-triaryl ZnII-porphyrins is advantageous in light of its high regioselectivity as well as i…
Abstract To find feasibility of identifying nucleotides at the single-molecule level, we implemented Raman imaging and spectroscopy of adenine molecules adsorbed on Ag colloidal nanoparticles. Surface enhanced Raman scattering (SERS) of adenine molecules showed an intermittent on-and-off behavior called “blinking”. Th…
In order to preserve the conditions for an environmentally safe machine, at present the selection of materials for the structural components of fusion reactors is made not only on the basis of adequate mechanical properties, behaviour under irradiation, and compatibility with other materials and cooling media, but als…
Novel 1,3,5-tris(oligothienyl)benzenes have been synthesized by an efficient and very easy trimerization reaction and their optimized three-dimensional geometry has been determined by semiempirical computations. Their electrochemical behavior has been investigated; their electropolymerization with 2,2′-bithiophene led…
Abstract The mechanical performance of natural fiber reinforced polymers is often limited owing to a weak fiber‐matrix interface. In contrast, melamine‐formaldehyde (MF) resins are well known to have a strong adhesion to most cellulose containing materials. In this Paper, nonwoven flax fiber mat reinforced and particu…
Diamond powders of different sizes were compressed at pressures up to 2.5 GPa and heated up to 1700 K. Extent of partial graphitization was estimated from x-ray diffraction and Raman scattering. For example, in the presence of water, at p=2.0 GPa and T=1473 K about 22% of diamond was converted into graphite. The rate…
We have designed and implemented an electrostatic lens that magnifies the images of an existing velocity map imaging apparatus up to a factor of 20. The lens can be used to vary the magnification while keeping the field strength in the interaction region constant. For the region of interest where magnification is requ…
Abstract The kinetics of the hydration of magnesia to produce magnesium hydroxide is described by a kinetic model with no diffusive contribution, including an additional resistance to the reactive flux due to the transient variation of the porosity of the material during reaction. The proposed model has been applied t…
Cellosyl is a bacterial muramidase from Streptomyces coelicolor. Similar to other lysozymes, the enzyme cleaves the beta-1,4-glycosidic bond between N-acetylmuramic acid and N-acetylglucosamine units, but it also exhibits a beta-1,4-N,6-O-diacetylmuramidase activity. The latter enables Cellosyl to degrade the cell wal…
Catalytic effects were investigated on the direct nitridation of silicon granules, impregnated with 0.125–2.0% by mass of calcium, yttrium, iron, copper, silver, chromium, or tungsten, in a stream of nitrogen with 10% hydrogen, using a tubular flow reactor operated at temperatures ranging from 1200° to 1390°C. Calcium…
ADVERTISEMENT RETURN TO ISSUEPREVCommunication to the...Communication to the EditorNEXTStructure of Poly(ferrocenyldimethylsilane) in Electrospun NanofibersZhihao Chen, Mark D. Foster, Wensheng Zhou, Hao Fong, Darrell H. Reneker, Rui Resendes, and Ian MannersView Author Information Department of Polymer Science, The U…
The functional behaviour of a model macromolecule (fibrinogen) adsorbed at the nanofabricated solid-liquid interface was found to be strongly influenced by the local topographic structure of the interface. Protein molecules bound at topographically structured surfaces (either chemically homogeneous or heterogeneous 40…
This is an electrochemical study of the Ni(II) and Cu(II) complexes of a series of β -octahalogeno- meso -tetrakis( p -X-phenyl)porphyrins, M[Y 8 T( p -X-P)P] (M = Ni, Cu; Y = Cl, Br; X = CH 3, H, F, Br, COOMe, CF 3, NO 2 ). We have analyzed the oxidation and reduction potentials by means of the Hammett equation. The…
The paper discusses the theory of quantum effects in incipient and low-temperature ferroelectrics and its application to the description of some phenomena observed in SrTiO3, KTaO3, and solid solutions based on these compounds. Two approaches are considered, namely, the Barrett theory in the framework of the single-io…
Abstract Nontronite and microbes were detected in the surface layers of deep-sea sediments from Iheya Basin, Okinawa Trough, Japan. Nontronite, an Fe-rich smectite mineral, was embedded in acidic polysaccharides that were exuded by microbial cells and electron microscopy showed that the nontronite layers were apparent…
The microwave performance of a diamond metal-semiconductor field-effect transistor (MESFET) is reported for the first time. MESFETs with a gate length of 2-3 μm and a source-gate spacing of 0.1 μm were fabricated on the hydrogen-terminated surface of an undoped diamond film grown by microwave plasma chemical vapor dep…
The forces between layers of poly(ethylene oxide) (PEO), of molecular weights M = 37 × 10 3 (PEO37) and M = 112 × 10 3 (PEO112) adsorbed onto smooth, curved solid (mica) surfaces across the good solvent toluene have been determined using a surface force balance (SFB). The SFB used is capable of measuring both normal i…