Materials Literature
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New dual mesogens, with α-methylstilbene and p-substituted azobenzene as main chain and side chain, respectively, and containing liquid crystalline polyphosphates, were synthesized. The pendant azobenzene units were unsubstituted or substituted with F, Cl, and Br atoms. All the polymers were synthesized by solution po…
The synthesis and characterization of single-wall carbon nanotubes (SWNTs) from simple catalytic precursors at 900 °C from methane and hydrogen is demonstrated. The catalyst precursor is comprised of iron nitrate and a commercially available siloxane polymer solution and is applied to various substrates via spin coati…
Models of Fe−zeolites have been used to study the dissociation of N 2 O, with and without the presence of ammonia. From Density Functional Theory calculations, the mechanism and energetics of N 2 O decomposition paths are presented and discussed. The influence of ammonia is analyzed. The results obtained for a single…
According to the group representation theory, we derive the character formulae of representation-matrices of the physical property tensors for the one-dimensional (1D) quasicrystals. Based on this, we have calculated the numbers of independent components of representation-matrices for thermal expansion coefficient ten…
Six series of new liquid crystalline materials with an azo group (N=N) located in different parts of the mesogenic core of the molecule have been synthesized and their physical properties studied. The chiral segments of these materials are based on alkoxypropionate or alkyllactate units. It has been found that lateral…
Abstract Summary: Degradation of a polymer in a reactor by the degrading agent(s) follows a distinct pattern, primarily influenced by structural integrity and reactor environment. This distinct pattern is recorded in the changes in the evolved molecular weight distribution (MWD) or polymer chain length distribution (P…
In Part II of this two-part study, system simulations and experimental correlations of a Shape Memory Alloy (SMA) based vibration isolation device (briefly described in Part I) has been presented. This device consists of layers of preconstrained SMA tubes undergoing pseudoelastic transformations under transverse dynam…
Particulate drug carriers offer unique opportunities to improve tumor therapy through several different mechanisms. Liposomes may (1) assist in formulation of poorly-soluble therapeutic agents, (2) provide a slow-release vehicle to achieve pharmacokinetic profiles that maximize the therapeutic index, or (3) behave as…
In this work, the effect of pseudoelastic response of shape memory alloys (SMAs) on passive vibration isolation has been investigated. This study has been conducted by developing, modeling, and experimentally validating a SMA-based vibration isolation device. This device consists of layers of preconstrained SMA tubes…
Electrostatic force microscopy was used to determine that single CdSe quantum rods (QRs) have a permanent polarization surface-charge density, an unexpected observation for supposedly well-shaped particles. The surface charge results from a slight angle between the QR sides and the direction of internal electric polar…
Perinones derivatives are industrially important pigments that exhibit shades in the solid state from red to bordeaux. Two representative derivatives are trans and cis isomers characterized by a clean reddish shade of orange (Pigment Orange 43) and bluish red (Pigment Red 194), respectively. The color generation mecha…
this paper a nonlinear stress-based controller is designed to position a singledegreeof-freedom shape memory alloy (SMA) actuated manipulator. A three-part model was constructed based on the dynamics/kinematics of the arm, the thermomechanical behavior of SMAs, and an assumed heat transfer model consisting of electric…
Abstract Polyamide‐6/silica nanocomposites were prepared via an in situ polymerization route using silicic acid as the precursor of silica, which was extracted from water glass. Scanning electron microscopy observations showed that the silica particles were well dispersed in the polyamide‐6 matrix on the nanometer sca…
An element-selective investigation of magnetism on carbon in the vicinity of Fe atoms in a C/Fe multilayer is reported. We utilize resonant magnetic reflectivity of circularly polarized synchrotron radiation which allows us to distinguish unambiguously the local magnetism on carbon from that on Fe through individual c…
A series of 1,3,4-oxadiazole-based liquid crystals bearing different polar substituents (n-NPO-X, where X=Me, OMe, Cl, F, CN, and NO2) at the phenyl 4-position have been synthesized and characterized. These angular oxadiazole-based liquid crystals, which are composed of asymmetric cores containing naphthalene units, e…
A novel conjugate of a polysaccharide and a Gd(III) chelate with potential as contrast agent for magnetic resonance imaging (MRI) was synthesized. The structure of the chelate was derived from H5DTPA by replacing the central pendant arm by a phosphinic acid functional group, which was covalently bound to the polysacch…
High-temperature ion mobility measurements have been performed for alpha-helical Ac-A15K+H+ and globular Ac-KA15+H+ peptides. The alpha-helical and globular conformations do not melt into random coils as the temperature is raised. Instead, both conformations survive to the point where the peptide signals vanishes due…
Abstract The synthesis, characterisation, X‐ray single crystal structures and magnetic properties of three new basal‐apical μ 2 ‐1,1‐azide‐bridged complexes [CuL 1 N 3 ] 2 ( 1 ), [CuL 2 N 3 ] 2 ( 2 ) and [CuL 3 N 3 ] 2 ( 3 ) with very similar tridentate Schiff‐base blocking ligands {HL 1 = N ‐[2‐(ethylamino)ethyl]sali…
We describe a new aligning technique that yields uniform planar or tilted orientation of a nematic liquid crystal at different organic and inorganic substrates. The method is based on the oblique irradiation of an aligning substrate with a partially collimated flux of accelerated plasma. The sheet-like plasma flux is…
Atomic force microscopy is used to investigate the possibility of cavity formation during crack growth in silicate glasses. Matching areas on both fracture surfaces were mapped and then compared. For silica glass, and soda-lime-silicate glass, the fracture surfaces matched to a resolution of better than 0.3 nm normal…