Materials Literature
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A facile technique for fabrication of individually addressable, conducting polymer nanowire arrays of controlled dimension, high aspect ratio, and site-specific positioning using electrodeposition between electrodes in channels created on semiconducting and insulating surfaces that can be easily scaled up is reported.…
Ab initio calculations of the structural, electronic, and optical properties of CdSe nanoparticles are presented. The atomic structures of the clusters are relaxed both in vacuum and in the presence of surfactant ligands. In both cases, we predict significant geometrical rearrangements of the nanoparticle surface whil…
The temperature and electrical field dependent conductivity of $n$-type CdSe nanocrystal thin films is investigated. In the low electrical field regime, the conductivity follows $\ensuremath{\sigma}\ensuremath{\sim}\mathrm{exp}[\ensuremath{-}({T}^{*}/T{)}^{1/2}]$ in the temperature range $10<T<120\text{ }\text{…
The National Institute of Standards and Technology (NIST) has implemented a high bandwidth laser interferometer measurement system in a specialized metrology microscope. The purpose of the system is the certification of SEM magnification calibration samples by moving the sample under a finely focused stationary electr…
Abstract Differential scanning calorimetry, wide‐angle X‐ray diffraction, small‐angle X‐ray scattering, and transmission electron microscope are employed to study the microstructure of biaxially self‐reinforced high‐density polyethylene (HDPE) prepared in uniaxial oscillating stress field by dynamic packing injection…
The Haldane gap material $\mathrm{Ni}({\mathrm{C}}_{2}{\mathrm{H}}_{8}{\mathrm{N}}_{2}{)}_{2}{\mathrm{NO}}_{2}({\mathrm{ClO}}_{4})$ exhibits anomalies in its Knight shift, far infrared absorption and field-dependent gaps, which have been explained using the staggered g tensor that occurs due to the low crystal symmetr…
Abstract In order to develop a photocatalyst operating under visible light irradiation, silica gel-supported dihydroxo(tetraphenylporphyrinato)antimony (V) complex, [SbTPP(OH)2]+/SiO2, was prepared. The photocatalytic oxidation of cycloalkenes with oxygen molecule was performed on [SbTPP(OH)2]+/SiO2 particles under ir…
Abstract Crosslinked poly(4‐vinylpyridine‐ co ‐styrene) used as support for a immobilized oxomolybdenum complex was synthesized by radical polymerization. As crosslinking agent, 1,4‐divinylbenzene (DVB) was incorporated at 2, 4, and 6 mol %. Catalysts having similar MoO 2 (acac) 2 loading on different resins were obta…
Abstract To improve the mechanical properties of poly(vinyl chloride) (PVC), the possibility of combining PVC with elastomers was considered. Modification of natural rubber (NR) by graft copolymerization with methyl methacrylate (MMA) and styrene (St) was carried out by emulsion polymerization by using redox initiator…
Abstract New thermally stable conducting materials can be obtained by dispersing conducting carbon black into poly(4,4′‐diphenylether‐1,3,4‐oxadiazole) (POD–DPE) solution in NMP. The blend preparation process resulted in quite good dispersed composite and a relatively low percolation threshold (around 5 wt % of CB). T…
Abstract Novel biodegradable copolymers, poly(1,4‐dioxan‐2‐one‐ co ‐glycolide) [P(DON‐ co ‐GA)] containing a high proportion of 1,4‐dioxan‐2‐one (DON), were synthesized by copolymerizations of DON and glycolide (GA) at 120 °C for 16 h using stannous octoate as catalyst. Chemical composition and microstructural variati…
Abstract Uniaxial oscillating stress field by dynamic packing injection molding (DPIM) is well established as a means of producing uniaxially self‐reinforced polyethylene and polypropylene. Here, the effects on the mechanical properties of high‐density polyethylene (HDPE) in both flow direction (MD) and transverse dir…
Abstract A polystyrene‐modified natural rubber (SNR) with 80% degree of grafting was evaluated against natural rubber (NR) in their blends with polystyrene (PS). The rubber loading of the PS‐SNR and PS‐NR blends was varied from 5 to 20% by volume. At 10–15% rubber loading, the PS‐SNR blends were found to be approximat…
Abstract As‐cast films of poly(2,5‐benzimidazole) exhibit uniplanar orientation in which the planes of the aromatic rings lie parallel to the film surface. Upon doping with phosphoric acid, the original crystalline order is lost, but the doped film can be stretched to produce films with uniaxial orientation. After the…
Abstract Two bifunctional aldehydes (i.e., glyoxal and glutaraldehyde) are used as the crosslinking agents to improve paper wet strength in the presence of fully hydrolyzed poly(vinyl alcohol) (PVA) as a co‐reactant. These bifunctional aldehydes alone improve paper wet strength but diminish its folding endurance. The…
Abstract Conducting polyaniline (PANI) was synthesized in mesoporous silica SBA‐15. The investigations of XRD, N 2 adsorption–desorption, and IR spectra confirm the existence of polyaniline in the channels of SBA‐15 hosts. The impedance of PANI/SBA‐15 composites was studied at different relative humidity (RH) levels,…
Neutral oxygen vacancies in amorphous $(a\ensuremath{-})$ ${\mathrm{SiO}}_{2}$ and ${\mathrm{GeO}}_{2}$ as well as bulk $a\ensuremath{-}{\mathrm{SiO}}_{2}$ and $a\ensuremath{-}{\mathrm{GeO}}_{2}$ configurations have been investigated by using the first-principles pseudopotential method in order to elucidate the mechan…
Scatterometry is a novel optical metrology that has received considerable attention in the silicon industry in the past few years. Based on the analysis of light scattered from a periodic sample, scatterometry technology can be thought of as consisting of two parts known as the forward problem and the inverse problem.…
Relationships between taxonomic composition of shallow epilithic algal communities and nine environmental variables in 32 lakes of different trophic states in Ireland were explored using gradient analysis. A canonical correspondence analysis using four representative environmental variables, alkalinity (correlated wit…
Single-stranded DNA (ssDNA)-binding (SSB) proteins are uniformly required to bind and protect single-stranded intermediates in DNA metabolic pathways. All bacterial and eukaryotic SSB proteins studied to date oligomerize to assemble four copies of a conserved domain, called an oligonucleotide/oligosaccharide-binding (…