Materials Literature
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ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTCatalytic Engineering of Carbon NanostructuresNelly M. Rodriguez, Alan Chambers, and R. Terry K. BakerCite this: Langmuir 1995, 11, 10, 3862–3866Publication Date (Print):October 1, 1995Publication History Published online1 May 2002Published inissue 1 October 1995https://pubs…
We have performed a molecular dynamics computer simulation of a supercooled binary Lennard-Jones system in order to compare the dynamical behavior of this system with the predictions of the idealized version of mode-coupling theory (MCT). By scaling the time t by the temperature dependent \ensuremath{\alpha}-relaxatio…
Abstract Pulsed‐laser polymerization (PLP) in conjugation with molecular weight distribution (MWD) measurement has emerged as the method of choice for determining the propagation rate coefficient k p in free‐radical polymerizations. Detailed guidelines for using this technique (including essential internal consistency…
Abstract Numerous BuSnCl , Bu 2 SnCl , and Bu 3 SnCl‐initiated polymerizations of cyclo(tri‐methylene carbonate) (TMC) were conducted in bulk. In addition to the initiator, reaction time, temperature, and monomer/initiator (M/I) ratio were varied. Yields above 90% were obtained with all three initiators, but their rea…
Abstract The crystallization of the monotropic liquid crystal forming polyether, poly‐ n ‐nonyl‐4 4′‐biphenyl‐2‐chloroethane, was investigated using DSC calorimetry and polarizing optical microscopy. The principal theme was the nature of crystallization from the nematic liquid crystalline state, which in the monotropi…
Abstract The synthesis of high glass transition temperature ( T g > 300°C), amorphous, soluble, poly‐imide oligomers of controlled molecular weight endcapped with 4‐phenylethynylphthalic anhydride endcapping agent is described. The 4‐phenylethynylphthalic anhydride was employed to afford a higher curing temperature…
Abstract The polymer decoration method based on the vaporization and condensation‐crystallization of polyethylene (PE) upon the fold surface of polymer crystals has been widely used to study the chain folding behavior of the crystals. When this method was utilized to study solution‐grown high molecular weight poly (et…
The most important classes of heterogeneous catalytic reactions involving CO2 are examined: the incorporation of CO2 in the C–C, C–H, and C–N bonds with formation of carbonyl- and carboxyl-containing compounds and oxidation of other compounds by CO2. Reactions of the second class are more promising from the standpoint…
Abstract Polyimides with large aromatic rings were prepared from 3,6‐diaminocarbazole (CDA), N ‐ethyl‐3,6‐diaminocarbazole (ECDA), 2,7‐diaminofluorene (DAF), 2,7‐diaminofluorenon (DAFO), and dimethyl‐3,7‐diaminodibenzothiophene‐5,5‐dioxide (DDBT) with 2‐bis(2,4‐dicarboxyphenyl) hexafluoropropane dianhydride (6FDA) and…
Differential cross sections for electron elastic scattering in mercury have been measured over the incident electron energy range 9 to 25 eV and the angular scattering range 10 to 120 degrees . The cross sections have been normalized to the absolute value of Holtkamp et al. (1987) at 25 eV and 60 degrees . The integra…
The M 2,3 -M 4,5 N Coster-Kronig and the M 2,3 -NN Auger electron spectra from krypton have been measured using synchrotron radiation and electron beam excitation. By combining information from the different excitation methods, a large number of transitions have been identified. Intensity distributions between the lin…
By means of self-consistent semi-empirical LCAO calculations we study the itinerant magnetism of (Fe_{0.65}Ni_{0.35})_{1-y} Mn_y alloys for y between 0 and 0.22 at T=0 K, neglecting only the transverse spin components. We find that the magnetic behaviour is quite complicated on a local scale. In addition to ferromagne…
We perform first-principles calculations for the three multilayer systems (100)-Co_1/Cu_n, -NiCo_2Ni/Cu_n and -Co_4/Cu_n, and find from a comparison x of the results for system 2 and 3 that amplitude and phase of the exchange coupling are sensitive to the magnetic-slab/nonmagnetic-spacer interface. Moreover, we observ…
Abstract Two contrasting infrared spectroscopic techniques, Attenuated Total Reflectance (ATR) and PhotoAcoustic Spectroscopy (PAS), have been investigated as means for the determination of fluorocarbon polymer finishes on wool fabric. Based on the experimental conditions used, the results of the PAS method are more c…
This paper describes a new design for a field emission electron gun immersed in a magnetic- lens field. Its low aberration yields both a high brightness and a high emittance. A single-pole- like magnetic lens made a water-cooled pipe coil produces a magnetic flux density of 0.28 T at the emitter tip. The spherical abe…
The interactions due to the Coulomb force between the constituents of charge particle beam systems have long been explored, with emphasis on the effect of the axial component known as `Boersch effect'. Fewer attempts have been made to quantitatively describe the lateral effects, the bulk space charge effect, which can…
The lateral capillary interaction between two particles immersed in a spherical thin liquid film is investigated. The interfacial shape, the lateral capillary force and the interparticle energy are calculated by using the numerical solution of the linearized Laplace equation of capillarity. Orthogonal bipolar coordina…
A technique for fabricating submicron free-standing silicon pillars has been developed. The silicon pillars have a high packing density, and aspect ratios over 50:1 can easily be achieved. Photoassisted electrochemical etching in hydrofluoric acid is used to etch deep macropores in n-type silicon wafers which have bee…
We present molecular dynamics results for the existence of long-lived clusters near the glass transition in a two component, two-dimensional Lennard-Jones supercooled liquid. Several properties of this system are similar to a mean-field glass-forming liquid near the spinodal. This similarity suggests that the glass ``…
Metastable Ge1−yCy alloys were grown by molecular beam epitaxy as homogeneous solid solutions having a diamond lattice structure. The substrates were (100) oriented Si wafers and the growth temperature was 600 °C. We report on measurements of the composition, structure, lattice constant, and optical absorption of the…