Materials Literature
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High refractive aromatic polyimides (PIs) containing a thianthrene-2,7-disulfanyl moiety in their main chain have been developed. The PIs were prepared from a newly developed aromatic diamine 2,7-bis(4-aminophenylenesulfanyl)thianthrene (APTT) and several aromatic dianhydrides by a two-step polycondensation procedure.…
Recent theory and measurements of the velocity of current-driven domain walls in magnetic nanowires have re-opened the unresolved question of whether Landau-Lifshitz damping or Gilbert damping provides the more natural description of dissipative magnetization dynamics. In this paper, we argue that (as in the past) exp…
MnWO4 has attracted attention because of its ferroelectric property induced by frustrated helical spin order. Strong spin-lattice interaction is necessary to explain ferroelectricity associated with this type of magnetic order.We have conducted thermal expansion measurements along the a, b, c axes revealing the existe…
Although the existence of 13-atom icosahedral clusters in one-component close-packed undercooled liquids was predicted more than half a century ago by Frank, the existence of such icosahedral clusters is less clear in liquid alloys. We study the lowest-energy structures of 13-atom AxB13-x Lennard-Jones binary clusters…
Polypyrrole (PPy)-coated Ag composites were synthesized through an immiscible organic/inorganic biphasic system in the presence of polyvinylpyrrolidone (PVP). Highly dispersed PPy/Ag was obtained by using interface polymerization and controlling the reactive conditions. The presence of PVP could realize the effective…
Over the past two decades synchrotron facilities dedicated to the generation of x-rays for study of atoms, molecules and condensed matter have proliferated all over the world. As a result of the special properties of x-rays produced by these machines, there has been an enormous growth in the experimental possibilities…
Antibody conjugated quantum dots are an emerging technology for high-resolution labeling of biological systems. In this work we determined the number of functional antibodies (i.e., antibodies that are sterically available for functional binding to target proteins) conjugated to semiconductor quantum dots. This is cri…
We use ab initio methods to calculate the magnetic properties of vacancies in a graphitic boron nitride sheet ($g$-BN). By applying a full spin-polarized description to the system, we demonstrate that the nitrogen vacancy $({V}_{\mathrm{N}})$ or the boron vacancy $({V}_{\mathrm{B}})$ can induce spontaneous magnetizati…
Thermally driven devices based on double-walled carbon nanotubes are proposed in this paper. Molecular dynamics simulations show that large-amplitude axial oscillation can be effectively excited for the local van der Waals potential barrier, ${V}_{\mathrm{loc}}$, accessible by the thermal fluctuation. Besides the axia…
In this report we demonstrate a simple model for the motion of a vortex domain wall in a ferromagnetic strip of submicron width under the influence of an external magnetic field. The model exhibits three distinct dynamical regimes. In a viscous regime at low fields the wall moves rigidly with a velocity proportional t…
Novel cellulose hydrogels were synthesized through a "one-step" method from cellulose, which was dissolved directly in NaOH/urea aqueous solution, by using epichlorohydrin as crosslinker. Structure and properties of the hydrogels were characterized by using SEM, NMR, and water absorption testing. The hydrogels are ful…
We have shown recently (Binks, B. P.; Rodrigues, J. A.; Frith, W. J. Langmuir 2007, 23, 3626) that, for mixtures of negatively charged silica nanoparticles and cationic surfactant, oil-in-water emulsions are most stable to creaming and coalescence at conditions of maximum flocculation of particles by surfactant in aqu…
In recent years, the stability field of a monoclinic phase at the morphotropic phase boundary in lead zirconate titanate, $\mathrm{Pb}[{\mathrm{Zr}}_{1\ensuremath{-}x}{\mathrm{Ti}}_{x}]{\mathrm{O}}_{3}$, has been under discussion. In the present study, we investigated samples in the compositional range between $0.40\e…
Spectroscopy in Catalysis is an introduction to the most important analytical techniques that are nowadays used in catalysis and in catalytic surface chemistry. The aim of the book is to give the reader a feeling for the type of information that characterization techniques provide about questions concerning catalysts…
Flexible transparent conducting films with sodium dodecyl sulfate-dispersed singlewalled carbon nanotubes (SWCNTs) were prepared by a spray method and were further immersed in various acids. The film conductivity was enhanced by a factor of ∼4 with a negligible change in the transmittance in the visible range. This en…
The key challenge in experimental quantum information science is to identify isolated quantum mechanical systems with long coherence times that can be manipulated and coupled together in a scalable fashion. We describe the coherent manipulation of an individual electron spin and nearby individual nuclear spins to crea…
Cardiovascular disease remains the leading cause of death in the United States, claiming more lives each year than the next five leading causes of death combined (American Heart Association National Center for Health Statistics). Coronary heart disease caused more than 1 in every 5 American deaths in 2000 and required…
Borkoordinationsverbindungen mit einer dachartigen Morphologie (siehe Struktur) zeigen ein ungewöhnliches flüssigkristallines Verhalten mit einem Übergang (roter Pfeil) von einer nematischen Mesophase (ähnlich zu einigen Flüssigkristallen aus Bananenmesogenen; links) zu einer kompakten lamellaren Phase mit chiraler Or…
We have used adsorption isotherms to study ethane films on bundles of purified HiPco single-walled carbon nanotubes (SWNTs). We infer the existence of a possible phase transition in this system from a sudden change in the temperature dependence of the coverage interval corresponding to a feature present in the isother…
A simple constitutive model of shape memory alloys for analyses of tension—compression quasiplastic behavior is derived. Here, three martensitic variants are considered; namely, thermal-induced, tensile stress-induced, and compressive stress-induced martensitic variants. Reorientation from one variant to another varia…