Materials Literature
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Questions surrounding the spatial disposition of particles in various condensed-matter systems continue to pose many theoretical challenges. This paper explores the geometric availability of amorphous many-particle configurations that conform to a given pair correlation function g ( r ). Such a study is required to ob…
The use of cyclen (1,4,7,10-tetraazacyclododecane) as a blocking ligand enables assembly of the mixed-valence square complex [(cyclen)4Ru4(pz)4]9+ (pz = pyrazine). A crystal structure determination shows the molecule to possess a regular square geometry wherein each Ru atom has an equivalent coordination environment.…
Dinuclear manganese(II), cobalt(II), nickel(II), and copper(II) complexes bridged by pyrimidine and pyrazine derivatives, L[M(hfac)2]2 [L = 4,6-di(2-pyridyl)pyrimidine (DPPM), 2,3-di(2-pyridyl)pyrazine (DPPZ); M = Mn, Co, Ni, Cu; hfac = 1,1,1,5,5,5-hexafluoropentane-2,4-dionate], were synthesized and their magnetic pr…
Two novel A−B−A type amphiphilic triblock copolymers, namely poly( N -(2-hydroxypropyl)methacrylamide)- block -poly(ε-caprolactone)- block -poly( N -(2-hydroxypropyl)methacrylamide) (PHPMA- b -PCL- b -PHPMA) and poly( N -vinyl-2-pyrrolidone)- block -poly(ε-caprolactone)- block -poly( N -vinyl-2-pyrrolidone) (PVP- b -P…
The influence of gravity on the capillary forces and stabilities of pendular liquid bridges between spherical bodies is examined including the special case of a sphere and a flat surface. Previously, this has only been possible by measurement or calculation for a particular bridge system. In the current work, it is sh…
A novel type of hollow zeolite capsules has been fabricated through a facile route involving the vapor-phase transport (VPT) treatment of the silicalite-1 seeds precoated mesoporous silica (MS) spheres. The properties of the capsule interiors can be easily tailored by encapsulating desired guest species that have been…
We study the properties of heterostructures formed by two layers of diluted magnetic semiconductor separated by a nonmagnetic semiconductor layer. We find that there is a RKKY-type exchange coupling between the magnetic layers that oscilles between ferromagnetic and antiferromagnetic as a function of the different par…
LiBC, a semiconducting ternary borocarbide constituted of the lightest elements only, has been synthesized and characterized by x-ray powder diffraction, dielectric spectroscopy, and conductivity measurements. Utilizing an infrared microscope the phonon spectrum has been investigated in single crystals. The in-plane B…
Quantum computation in molecular magnets is studied by solving the time-dependent Schr\"odinger equation numerically. Following Leuenberger and Loss [Nature (London) $410,$ 789 (2001)], an external alternating magnetic field is applied to populate and manipulate a superposition of single-spin states in molecular magne…
The adsorption on silica wafers of a hyperbranched, high molecular weight polyethylenimine (PEI) was investigated using reflectometry. The pH and ionic strength dependence of PEI adsorption kinetics and that of the adsorbed amount were interpreted according to the complex balance of segment/segment and segment/surface…
We report the synthesis of open-ended MoS2 nanotubes and their application as the catalyst for methanation of carbon monoxide with hydrogen. Because the catalysis of the methanation reaction occurs at relatively low temperatures, such nanotubes may provide new solutions toward harnessing the environmental load caused…
Biology provides us with a unique set of self-assembled fibrillar networks in the form of amyloid fibrils, derived from the self-assembly of a number of peptides or misfolded proteins. These, in turn, are associated with a number of diseases such as Alzheimer's, Creutzfeldt−Jakob disease (CJD), and type II diabetes. R…
The unequivocal observation in the early 1980s of a new class of unnocupied surface states that are bound to the vacuum level of a variety of metal surfaces has led over the last two decades to an active area of research in condensed-matter and surface physics. We discuss the key ingredients of the theory of these so-…
A review is presented on the observation of the resonant Raman spectra from one isolated single wall carbon nanotube, focusing on the important structural information that is provided by single nanotube spectroscopy including the (n, m) determination of the individual tubes. The special sensitivity of the radial breat…
Shape Memory Alloys have been used in a wide variety of actuation applications. A bundled shape memory alloy cable actuator, capable of providing large force and displacement has been developed by United Technologies Corporation (patents pending) for actuating a Variable Area fan Nozzle (VAN). The ability to control f…
Abstract The mechanical and heat‐resistant properties of acrylonitrile–butadiene–styrene (ABS) binary and ternary blends were investigated. The relationship of compatibility and properties was discussed. The results show that poly(methyl methacrylate) (PMMA) and styrene–maleic anhydride (SMA) can improve the thermal p…
Ti/SiO 2 samples with different titanium contents were prepared by chemical vapor deposition (CVD) of TiCl 4 on silica gel in the temperature range 400−1100 °C. The resulting samples were used to catalyze the reaction of propylene with tert -butyl hydroperoxide (TBHP) to propylene oxide (PO). It was found that deposit…
The interaction of low-energy XeF 2 with Si(100)(2 × 1) has been studied and compared to that of F 2 . Helium atom diffraction, beam-surface scattering, and thermal desorption measurements are the major techniques used in this study. It is found that XeF 2 dissociatively chemisorbs with high probability solely on the…
Solubilities of terephthalaldehydic acid in water, acetic acid, chloroform, N, N -dimethylformamide, and N -methyl-2-pyrrolidone were determined by a static analytical method at temperatures ranging from 293.15 K to 371.15 K at atmospheric pressure. The Buchowski equation was used to correlate the solubility data with…
A large contrast ratio and rapid switching electrochromic(EC) polymer device which consists of laminated two-layer structure between two electrodes was proposed. The new design which only comprises an ITO coated glass electrode, a cathodic poly(3,4-propylenedioxythiophene) derivative (PProDOT-(CH<SUB>3$</SUB><SUB>2</S…