Materials Literature
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We have studied the photoexcited carrier relaxation dynamics in the Kondo insulator SmB6 and the heavy fermion metal YbAgCu4 as a function of temperature and excitation level. The dynamic response is found to be both strongly temperature dependent and nonlinear. The data are analyzed with a Rothwarf-Taylor bottleneck…
The investigation of small size embedded nanostructures, by a combination of complementary anomalous diffraction techniques, is reported. GaN Quantum Dots (QDs), grown by molecular beam epitaxy in a modified Stranski-Krastanow mode, are studied in terms of strain and local environment, as a function of the AlN cap lay…
The response of polar nanoregions (PNR) in the ferroelectric relaxor $\mathrm{Pb}[{({\mathrm{Zn}}_{1∕3}{\mathrm{Nb}}_{2∕3})}_{0.92}{\mathrm{Ti}}_{0.08}]{\mathrm{O}}_{3}$ subject to a [111]-oriented electric field has been studied by neutron diffuse scattering. Contrary to classical expectations, the diffuse scattering…
Transparent polymers were reinforced by bacterial cellulose (BC) nanofibers, which are 10×50nm ribbon-shaped fibers. They exhibited high luminous transmittance at a fiber content as high as 60 wt %, and low sensitivity to a variety of refractive indices of matrix resins. Due to the nanofiber size effect, high transpar…
We have investigated the growth of antiferromagnetic Mn3N2(001) on MgO (001) by molecular beam epitaxy and scanning tunneling microscopy . The images show smooth terraces and atomic steps. On some of the terraces a unique and new reconstruction is seen, resolved as square Mn tetramers in a c(4x2) structural arrangemen…
We study how confining the equilibrium hard-sphere fluid to restrictive one- and two-dimensional channels with smooth interacting walls modifies its structure, dynamics, and entropy using molecular dynamics and transition-matrix Monte Carlo simulations. Although confinement strongly affects local structuring, the rela…
Let's twist again: Transcription of molecular chirality from common stereogenic centers to amplified supramolecular chirality during the coassembly of gel-forming π-conjugated molecules by inverted helicity results in the formation of longitudinally fused M and P helices. This “sergeants and soldiers” approach to coas…
A strictly heterodinuclear Cu-Tb complex [LCu(O(2)COMe)Tb(thd)(2)] made with a Schiff base L, thd, and monomethylcarbonate ligands [L(2-) = N,N'-2,2-dimethylpropylenedi(3-methoxysalicylideneiminato); thd = tetramethylheptanedionato] behaves like a single-molecule magnet. The monomethylcarbonate ligand, which appears d…
Playing the platinum card: By means of a self-organization process at low temperature in organic solvent, porous platinum nanoparticles of excellent dispersity have been prepared. The particles are obtained as flowerlike arrays (see TEM image), and their porosity was shown to be similar to other mesoporous Pt systems.…
Abstract Nanocomposites of chitosan and nanoclays (MMT‐Na + and Cloisite 30B) were prepared by solvent casting. The structural properties, thermal behaviors, and mechanical properties were characterized using X‐ray diffraction (XRD), transmission electron microscopy (TEM), atomic force microscopy, differential scannin…
We present results of an ab initio density-functional theory study of three bismuth-based multiferroics, $\mathrm{Bi}\mathrm{Fe}{\mathrm{O}}_{3}$, ${\mathrm{Bi}}_{2}\mathrm{Fe}\mathrm{Cr}{\mathrm{O}}_{6}$, and $\mathrm{Bi}\mathrm{Cr}{\mathrm{O}}_{3}$. We disuss differences in the crystal and electronic structure of th…
Polyaniline nanofibers are shown to form spontaneously during the chemical oxidative polymerization of aniline. The nanofibrillar morphology does not require any template or surfactant, and appears to be intrinsic to polyaniline synthesized in water. Two approaches--interfacial polymerization and rapidly-mixed reactio…
The cover picture illustrates redox‐promoted self‐assembly of an eight‐residue cyclic D , L ‐α‐peptide bearing four 1,4,5,8‐naphthalenetetracarboxylic diimide side chains into electronically delocalized peptide nanotubes hundreds of nanometers in length. The background picture was derived from an atomic force microsco…
We show that electron wave functions in a quasi-two-dimensional conductor in a parallel magnetic field are always localized on conducting layers. In particular, wave functions and the electron spectrum in a quantum limit, where the sizes of quasiclassical electron orbits are of the order of nanoscale distances between…
We have measured the decay of local conductance in single-wall carbon nanotubes directly using conductance imaging atomic force microscopy. The decay lengths were in the range from $190\phantom{\rule{0.3em}{0ex}}\mathrm{nm}$ to well over $3\phantom{\rule{0.3em}{0ex}}\ensuremath{\mu}\mathrm{m}$. There are strong indica…
The large tunneling anisotropic magnetoresistance of a ferromagnetic p++-(Ga,Mn)As∕n+-GaAs Zener-Esaki diode is shown in a perpendicular magnetic field over a large temperature and voltage range. Under an applied bias, the tunnel junction transparency is modified, allowing one to continuously tune anisotropic transpor…
Complexation of 3-nitronyl-nitroxide-substituted pyrazolate (pzNN) and 3-imino-nitroxide-substituted pyrazolate (pzIN) with nickel(II) gave [Ni3(pzNN)6] and [Ni3(pzIN)6], respectively. They were practically isomorphous and characterized as a linear trinuclear structure with neighboring nickel ions triply bridged by py…
Compact expressions are derived for the maximum operating frequency of carbon nanotube field-effect transistors. The expressions are shown to be applicable over wide ranges of physical properties, parasitic resistances, and gate biases. The utility of the expressions is demonstrated by their prompting of a conservativ…
In this work, the fabrication technique for micropatterns of a colloidal assembly on a gold-patterned electrode surface using electrophoretic deposition is described. It was found that the micropatterns of a colloidal assembly were preferentially deposited onto the gold pattern region, when a gold patterned indium tin…
Structural modification of nanosized diamonds (ND) irradiated with 100 keV 15 N ions for various doses was investigated using transmission electron microscopy (TEM) and Raman spectroscopy. Raman active modes showing a long-range order of diamond were observed for samples dosed with 10 15 cm −2 . However, the formation…