Materials Literature
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Abstract We demonstrate that alkylthiol‐capped gold nanoclusters doped into nematic liquid crystals (N‐LCs) with positive dielectric anisotropy give rise to an unprecedented dual alignment mode and electro‐optical response, which has a potential impact on current liquid crystal (LC) display technologies and N‐LC optic…
Exotic features of a metal/oxide/metal sandwich, which will be the basis for a drastically innovative nonvolatile memory device, is brought to light from a physical point of view. Here the insulator is one of the ubiquitous and classic binary-transition-metal oxides (TMO), such as ${\mathrm{Fe}}_{2}{\mathrm{O}}_{3}$,…
We investigate exciton spin memory in individual InAs/GaAs self-assembled quantum dots via optical alignment and conversion of exciton polarization in a magnetic field. Quasiresonant phonon-assisted excitation is successfully employed to define the initial spin polarization of neutral excitons. The conservation of the…
We consider the magnetic circular dichroism spectrum of a crystal with broken time-reversal symmetry in the electric-dipole approximation. Using the Kubo-Greenwood formula for the absorptive part of the antisymmetric optical conductivity, its frequency integral is recast as a ground-state property. We show that in ins…
Nanobeam electron diffraction and a series of dark field images techniques were used to investigate the deformation mechanisms of nanocrystalline (nc) Ni in response to in situ tensile deformation under transmission electron microscopy (TEM). The experiments exhibit the complete processes of individual grain rotation…
We study theoretically the quantum transport properties of the Dirac fermions with spin-orbit interactions (SOIs) in graphene by using the method of Schwinger proper time together with decomposition over Landau level poles and Kubo formula. The analytical expressions for both longitudinal and Hall conductivities are d…
We investigate the transition between the Cassie-Baxter and Wenzel states of a slowly evaporating, micron-scale drop on a superhydrophobic surface. In two dimensions analytical results show that there are two collapse mechanisms. For long posts the drop collapses when it is able to overcome the free-energy barrier pre…
Despite significant progress in synthesizing several new molecules and many promising single device demonstrations, wide range acceptance of molecular electronics as an alternative to CMOS technology has been stalled not only by controversial theories of a molecular device`s operation, for example the switching mechan…
Extending the recently-developed bond-order-length-strength (BOLS) correlation mechanism [Sun CQ, Prog Solid State Chem 2007, 35, 1-159] to the pressure domain has led to atomistic insight into the phase stability of nanostructures under the varied stimuli of pressure and solid size. It turns out that the competition…
A giant electromechanical d33 coefficient 110pC∕N is obtained in ferroelectric V-doped ZnO films, which is nearly one order of magnitude higher than that of undoped samples. It is considered that the switchable spontaneous polarization induced by V dopants and the accompanying relatively high permittivity should be re…
Therapeutic benefit in glial tumors is often limited due to low permeability of delivery systems across the blood-brain barrier (BBB), drug resistance, and poor penetration into the tumor tissue. In an attempt to overcome these hurdles, polyether-copolyester (PEPE) dendrimers were evaluated as drug carriers for the tr…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTComposites of Intrinsically Conducting Polymers as Sensing NanomaterialsDavid W. Hatchett and Mira JosowiczView Author Information Department of Chemistry, University of Nevada, Las Vegas, Nevada 89154-4003 and Department of Chemistry and Biochemistry, Georgia Institute of T…
Abstract Two bipyridine derivatives were synthesized and characterized, and their ability to act as sensors for carboxylates was evaluated by UV/Vis and fluorescence studies. The influence of the substituents of the thiourea groups on the stoichiometry of the resulting dicarboxylate complexes was established. Conforma…
The shape change associated with the phase transformation of PTFE at room temperature was measured under uniaxial compressive load in a specially designed dilatometer. The transformation is insensitive to cooling rate. Shape changes due to lattice variant shear were not found if the transformation occurs under an exte…
ZusammenfassungAm Modell einer festen Lösung von C35H70O in n-C36H74 wurde durch parallel geführte dielektrische und röntgenographische Experimente die Aktivierungsenergie des dielektrischen α-Prozesses (Flip-flop-Sprünge) und ihre Abhängigkeit von den Gitterkonstanten gemessen. Die Untersuchungen machen deutlich, daß…
Abstract As a part of long‐term project aimed at biomembrane mimicking polyurethanes (PU) with excellent biocompatibility and good mechanical properties, in this work, we report the surface and bulk properties of two series blends of fluorinated phosphatidylcholine polyurethanes (FPCPU) with poly(ether urethane)s (PEU…
The adsorption of tertiary butanol, 2,2,4-trimethylpentan-3-ol, and of di-isopropylether on silicas of different hydroxyl group densities has been studied by gravimetry and infrared spectroscopy. The adsorption of these molecules is entirely reversible. Isosteric heats and entropies of adsorption as well as infrared r…
We investigated the electronic and magnetic properties of thick films of molecular ${{\mathrm{Cr}}_{8}}$ and ${{\mathrm{Cr}}_{7}\mathrm{Ni}}$ antiferromagnetic rings by means of x-ray absorption spectroscopy and x-ray magnetic circular dichroism (XMCD). We determined the local symmetries, the electronic configuration,…
A nonequilibrium Ward identity (NE WI) connecting the scalar transport vertex correction with one-particle self-energy is derived using the global $\mathrm{U}(1)$ symmetry of the fermion nonequilibrium Green's functions (NGF). The nonperturbative derivation does not depend on the details of the many-body system. A ren…
The stress-strain relation for uniaxially stretched PE ist discussed on the base for theory of real molecular networks with the crystals taking as active fillers. Microstructure changes by solid state deformation of the crystals, their local melting and recrystallization. The solid state transformations influence the…