Materials Literature
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The phase separation of ultrathin polymer-blend films of polystyrene and polybutadiene on microcontact printed alkanethiol patterns with hydrophobic and hydrophilic end groups $(\ensuremath{-}{\mathrm{CH}}_{3}$ and -COOH) is investigated by atomic force microscopy. Simulations suggest that the phase-separation morphol…
The hydrogenation of ethylene, 1-butene, and 1,3-butadiene has been used as a probe reaction in an attempt to monitor any possible changes in catalytic behavior induced by supporting nickel on different types of graphite nanofiber support materials. This study is designed to compare the catalytic behavior of the metal…
Voronoi and Delaunay tessellations are applied to pattern recognition of atomic environments and to investigation of the nonlocal order in molecular-dynamics (MD)-simulated materials. The method is applicable also to materials generated using other computer techniques such as Monte Carlo. The pattern recognition is ba…
ADVERTISEMENT RETURN TO ISSUEPREVCommunication to the...Communication to the EditorNEXTLarge-Area Domain Alignment in Block Copolymer Thin Films Using Electric FieldsP. Mansky, J. DeRouchey, T. P. Russell, J. Mays, M. Pitsikalis, T. Morkved, and H. JaegerView Author Information Polymer Science and Engineering Departme…
A strong correlation between the logarithm of the secondary \ensuremath{\beta}-relaxation time, ${\mathrm{log}}_{10}[{\ensuremath{\tau}}_{\ensuremath{\beta}}{(T}_{g})],$ and the Kohlrausch exponent, $(1\ensuremath{-}n),$ or the fragility index $m$ of the primary \ensuremath{\alpha}-relaxation correlation function $\ma…
Magnetic circular dichroism (MCD) of a ferromagnetic diluted magnetic semiconductor Ga1−xMnxAs films was measured to clarify their electronic structure. Strong enhancement of MCD by Mn substitution indicated a strong sp–d hybridization. The p–d exchange interaction was concluded to be antiferromagnetic, which was in c…
We present the results of two studies: (1) a comparison of force−distance ( F − D ) profiles obtained by atomic force microscopy (AFM) and the surface forces apparatus (SFA) for a poly(2-vinylpyridine)−polystyrene (PVP−PS) brush in good solvent; (2) a series of F − D profiles for a poly(4- tert -butylstyrene)−sodium p…
An in-situ monitoring method was used to observe the initiation sites and the processes of pitting corrosion in aluminum alloy 2024-T3 (UNS A92024) in real time. These observations complemented more detailed information about composition and distribution of constituent particles, pre-and post-corrosion surface morphol…
The alloys with composition of SmCo7−xZrx(x=0–0.8) were synthesized and characterized in the temperature range of 10–1273 K and at fields up to 5 T. The experimental results show that a small amount of Zr substitution can contribute to a stabilization of the TbCu7 structure, and improve magneto-anisotropy Ha from 90 k…
The specific heat $C(T)$ of ${\mathrm{ZrW}}_{2}{\mathrm{O}}_{8}$ is measured from 1 to 300 K. Below 50 K, $C(T)$ is dominated by an Einstein term of energy $\ensuremath{\Elzxh}{\ensuremath{\omega}}_{0}\ensuremath{\approx}5\mathrm{meV}$, which represents 6.5% of the total lattice degrees of freedom. This concentration…
Abstract The SEM, XRD, FFIR and DTA analyses of different size-fractions of clay material from sandstone reservoirs which have experienced a large range of burial conditions have been used to examine the different steps of the depth-related kaolinite-dickite reaction. Dickite progressively replaced kaolinite within a…
Lewis acid−base interactions between anions and iodine-containing neutral molecules have been utilized in order to accomplish multicomponent molecular conductors with supramolecular assemblies. In the presence of diiodoacetylene (DIA), p -bis(iodoethynyl)benzene ( p BIB), and/or tetraiodoethylene (TIE), several cation…
ADVERTISEMENT RETURN TO ISSUEPREVCommunication to the...Communication to the EditorNEXTBiologically Derived Conducting and Water Soluble PolyanilineLynne A. Samuelson, Althea Anagnostopoulos, K. Shridhara Alva, Jayant Kumar, and Sukant K. TripathyView Author Information Science and Technology Directorate, U.S. Army Na…
ADVERTISEMENT RETURN TO ISSUEPREVCommunicationNEXTRational Design of Benzyl-Type Protecting Groups Allows Sequential Deprotection of Hydroxyl Groups by Catalytic HydrogenolysisMatthew J. Gaunt, Jinquan Yu, and Jonathan B. SpencerView Author Information University Chemical Laboratory, Lensfield Road, Cambridge, CB2 1EW…
A method for the fabrication of luminescent Si nanoclusters in an amorphous SiO2 matrix by ion implantation is reported. We have measured the dose (concentration of excess Si atoms) and annealing time dependence of the photoluminescence of Si nanoclusters in SiO2 layers at room temperature. The samples were fabricated…
Quantum dots are man-made “droplets” of charge that can contain anything from a single electron to a collection of several thousand. Their typical dimensions range from nanometres to a few microns, and their size, shape and interactions can be precisely controlled through the use of advanced nanofabrication technology.
Macroporous materials with highly uniform pores in the range 50 nm to 20 μm and of any desired porosity up to 90% can be produced using the method introduced here—emulsion templating. The Figure shows an extremely porous poly(acrylamide) gel, one of the many types of materials that can be synthesized using this versat…
The application of carbon nanotubes in biology is promising owing to their many unique and favorable properties, from high tensile strength and high electrical conductivity to the ability to be wet by water. The use of nanotubes for the immobilization and visualization of DNA and proteins is illustrated. For example,…
The durability of two water-repellents for granitic stonework was determined. Weathered and sound samples of granites widely used in building construction and restoration in Galicia (NW Spain) were treated with water repellents of known efficacy, and then subjected to two artificial weathering tests: prolonged exposur…