Materials Literature
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Abstract Porous nickel oxide (NiO) nanofibers, structured with and composed of linearly oriented NiO nanoparticles, were synthesized via a simple method using a solution containing ethanol, H2O, NiCl2, and P123 (Pluronic P123, a triblock copolymer H(OCH2CH2)20(OCH(CH3)CH2)70(OCH2)20OH). By adjusting the concentration…
We introduce a phase field model which permits the study of the morphological evolution of second phase particles coherently precipitated from the mother phase in elastically stressed alloys. The model has three field variables: the concentration of solute atoms, the displacement field, and the phase field. These fiel…
Two different cellulosic substrates in the form of powders and regenerated fibers were surface modified with different isocyanates in a heterogeneous organic medium. Two of these isocyanates also bore alkenyl functions which were used as a means of copolymerization in subsequent reactions involving common monomers. Th…
Two new thorium chalcophosphates have been synthesized by the reactive flux method and characterized by single-crystal X-ray diffraction, diffuse reflectance, and Raman spectroscopy: Cs4Th2P6S18 (I); Rb7Th2P6Se21 (II). Compound I crystallizes as colorless blocks in the triclinic space group P1 (No. 2) with a = 12.303(…
The hydrogen sorption capacity of arc-synthesized single-walled carbon nanotubes (SWNTs) was studied using a specially built high-pressure rig coupled to a Toepler pump capable of directly measuring the desorbed volumes of gas. The samples studied were prepared using the arc-evaporation method and were as-produced SWN…
The C amount and the structure of the $\mathrm{S}\mathrm{i}(001)\mathrm{\text{\ensuremath{-}}}c(4\ifmmode\times\else\texttimes\fi{}4)$ surface is studied using scanning tunneling microscopy (STM) and ab initio calculations. The $c(4\ifmmode\times\else\texttimes\fi{}4)$ phase is found to contain $1/8$ monolayer C (1 C…
Synthesis of multi-walled carbon nanotubes in high yield using Mm based AB2 alloy hydride catalysts and the effect of purification on their hydrogen adsorption properties, Shaijumon, M M, Rajalakshmi, N, Ryu, Hojin, Ramaprabhu, S
We present a novel route to prepare pH-dependent nanostructures from highly ordered thin films of poly(styrene)- block -poly(2-vinylpyridine)- block -poly( tert -butyl methacrylate) triblock terpolymers. Using a polymer-analogous reaction, we modify the chemical nature of the block components without altering the over…
We investigate ambipolar to unipolar transition by the effect of ambient air on the carbon nanotube field-effect transistor. A unipolar transport property of the double-walled nanotube field-effect transistor and its conversion from ambipolar behavior are observed. We suggest that adsorptions of oxygen molecules, whos…
The geometrical and chemical structure of the $\mathrm{CoAl}(111)$ surface is investigated by quantitative low-energy electron diffraction and calculations applying density functional theory. The stacking sequence of the top four atomic planes is $\mathrm{Al}\text{\ensuremath{-}}\mathrm{Co}\text{\ensuremath{-}}\mathrm…
Quantitative convergent-beam electron diffraction (QCBED) experiments allow absolute scale measurements of low-order structure factors with very high accuracy. In this paper, eight low-order structure factors for copper measured by QCBED have been combined with the higher-order gamma-ray structure factors in order to…
Large fullerenes and carbon-coated metal nanoparticles that are formed during the synthesis of carbon nanotubes have been functionalized by the addition of alkyl radicals and isolated by extraction into chloroform. The soluble, functionalized fullerenes have been isolated from raw single-wall carbon nanotube (SWNT) ma…
A novel one-pot procedure starting from the corresponding M(acac)3 x nH2O, metal-free phthalocyanine H2Pc', and naphthalonitrile in the presence of DBU in n-octanol has been developed to prepare heteroleptic (naphthalocyaninato)(phthalocyaninato) rare earth double-decker complexes. A series of six sandwich compounds w…
The interaction of Zn-polar and O-polar ZnO surfaces with atomic hydrogen produced by a remote rf plasma source is investigated in situ and in real time using spectroscopic ellipsometry. It is found that the reactivity of ZnO with atomic hydrogen depends on polarity. The interaction of O-polar surfaces with atomic hyd…
Semiconducting carbon nanotubes (CNT) have gained immense popularity as possible successors to silicon as the channel material for ultra high performance field effect transistors. On the other hand, their metallic counterparts have often been regarded as ideal interconnects for the future technology generations. Owing…
The defect effect on hydrogen adsorption on single-walled carbon nanotubes (SWNTs) has been studied by using extensive molecular dynamics simulations and density functional theory (DFT) calculations. It indicates that the defects created on the exterior wall of the SWNTs by bombarding the tube wall with carbon atoms a…
Oxygen permeability data, vital parameters for understanding and modeling the thermooxidative degradation of polymers, have been determined for various elastomers. Using a novel experimental setup, oxygen permeability through sheet materials was measured for elevated temperatures up to 225 °C. Under these conditions o…
Short, natural fibers belonging to the species Hildegardia populifolia were reinforced in styrenated polyester matrix. The mechanical properties of these polymer composites such as tensile modulus, compression strength at first deformation, flexural modulus, and izod impact strength were determined. The effect of alka…
An amphiphilic ABA triblock copolymer was synthesized using poly(2-ethyl-2-oxazoline) (PEtOz) as hydrophilic block [A] and poly(dimethylsiloxane) (PDMS) as hydrophobic block [B]. The cationic ring-opening polymerization of 2-ethyl-2-oxazoline was initiated by benzyl chloride in the presence of NaI. PEtOz–PDMS–PEtOz wa…
A technique is described that allows the staining and subsequent visualization of polymers that contain the phosphorylcholine (PC) group. These materials are useful as bulk materials or coatings for the fabrication of medical devices. The staining method employs rhodamine 6G, which can be simply and rapidly applied to…