Materials Literature
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We report results of 11B NMR and susceptibility measurements on the quasi 2D frustrated dimer spin system SrCu2(BO3)2 under high pressure. At 2.4 GPa and in a magnetic field of 7 T, NMR lines split with decreasing temperature in two steps. A gradual splitting below T=30 K breaking the four-fold symmetry of magnetic re…
We report here the synthesis of water soluble Mn 2+ -doped CdS nanocrystals in which it has been possible for the first time to obtain a distinct Mn 2+ d -related emission well-separated from the defect state emissions. By varying the reaction temperature systematically, we establish 55 °C as the optimum temperature t…
The structural organization of sodium borophosphate glasses with composition (Na 2 O) 0.4 [(B 2 O 3 ) x (P 2 O 5 ) 1 - x ] 0.6 (0.0 ≤ x ≤ 1.0) has been investigated by 11 B and 31 P magic-angle spinnning (MAS) NMR spectroscopy. Spectral deconvolutions and established chemical shift trends yield a detailed quantitative…
Nanomaterials, with dimensions in the 1-100 nm range, possess numerous potential benefits to society. However, there is little characterization of their effects on biological systems, either within the environment or on human health. The present study examines cellular interaction of aluminum oxide and aluminum nanoma…
The solidification pressure of Daphne 7373, which is widely used as a pressure medium in high pressure studies, was examined at room temperature. Using a new generation clamp-type pressure cell, we found that Daphne 7373 solidifies at 2.2 GPa at room temperature. This is exactly on the natural extrapolation of the mel…
The development of nanoparticulate contrast agents is providing an increasing contribution to the field of diagnostic and molecular imaging. Such agents provide several advantages over traditional compounds. First, they may contain a high payload of the contrast-generating material, which greatly improves their detect…
Analysis of the Raman Stokes peak position and its shift has been frequently used to estimate either temperature or stress in microelectronics and microelectromechanical system devices. However, if both fields are evolving simultaneously, the Stokes shift represents a convolution of these effects, making it difficult…
The phase behavior of ABC triblock copolymer melts is studied by self-consistent-field theory (SCFT). We focus on “nonfrustrated” triblocks, in which the Flory−Huggins interaction parameter χ AC between the end blocks is significantly larger than that between the middle and either end block, i.e., χ AC ≫ χ AB ∼ χ BC .…
For the study of crystal formation and dynamics, we introduce a simple two-dimensional monatomic model system with a parametrized interaction potential. We find in molecular dynamics simulations that a surprising variety of crystals, a decagonal, and a dodecagonal quasicrystal are self-assembled. In the case of the qu…
In a recent paper Sai {\it et al.} [1] identified a correction $R^{dyn}$ to the DC conductance of nanoscale junctions arising from dynamical exchange-correlation ($XC$) effects within time-dependent density functional theory. This quantity contributes to the total resistance through $R=R_{s}+R^{dyn}$ where $R_{s}$ is…
We reply to the comment by Jung, Bokes, and Godby (arXiv:0706.0140) on our paper Phys. Rev. Lett. 94, 186810 (2005). We show that the results in their comment should not be taken as an indication that the viscosity corrections to the conductance of real nanoscale structures are small. A more accurate treatment of the…
We present magnetic and tunnel transport properties of (Ga,Mn)As/(In,Ga)As/(Ga,Mn)As structure before and after adequate annealing procedure. The conjugate increase of magnetization and tunnel magnetoresistance obtained after annealing is shown to be associated to the increase of both exchange energy $Δ$$_{exch}$ and…
Abstract Micas incorporate a wide variety of elements in their crystal structures. Elements occurring in significant concentrations in micas include: Si, IV Al, IV Fe 3+ , B and Be in the tetrahedral sheet; Ti, VI Al, VI Fe 3+ , Mn 3+ , Cr, V, Fe 2+ , Mn 2+ , Mg and Li in the octahedral sheet; K, Na, Rb, Cs, NH 4 , Ca…
Individual multiwalled boron nitride nanotubes of different diameters (40−100 nm) were bent inside a 300 kV high-resolution transmission electron microscope (TEM) using a new fully integrated TEM−atomic force microscope (AFM) piezodriven holder under continuous recording of force−piezodisplacement curves. The tubes we…
Cancer nanotechnology is currently under intense development for applications in cancer imaging, molecular diagnosis and targeted therapy. The basic rationale is that nanometer-sized particles, such as biodegradable micelles, semiconductor quantum dots and iron oxide nanocrystals, have functional or structural propert…
A facile dual-templating approach is demonstrated to prepare hierarchically ordered macro-/mesoporous carbons. Monodispersed silica colloidal crystals are used as a hard template, amphiphilic triblock copolymer PEO−PPO−PEO as a soft template, and soluble resols as a carbon source. The procedure involves packing and ag…
An important challenge in developing ultra-sensitive surface enhanced Raman spectroscopy (SERS) platforms lies in the creation of nanoscale hot spots, locations where the electromagnetic field is greatly concentrated. Even when this is successful, finding these hot spots is a difficult task. We describe a novel chemic…
We modeled the response of superconducting nanowire single-photon detectors during a photodetection event, taking into consideration only the thermal and electrical properties of a superconducting NbN nanowire on a sapphire substrate. Our calculations suggest that heating which occurs after the formation of a photo-in…
Abstract We investigated the optical properties of colloidal-synthesized ZnO spherical nanoparticles prepared from 1-octadecene (OD), a mixture of trioctylamine (TOA) and OD (1:10), and a mixture of trioctylphosphine oxide (TOPO) and OD (1:12). It is found that the green photoluminescence (PL) of samples from the mixt…
Abstract Transparent conductive Sn‐doped β‐Ga 2 O 3 single crystal with high crystallinity was successfully fabricated as a substrate for the growth of GaN‐based compounds. Sn‐doped β‐Ga 2 O 3 single crystals were grown using a floating zone (FZ) method, and the properties of electrical conductivity, optical transmitt…