Materials Literature
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We investigated the critical voltage for electromigration (EM) in atomic-scale Cu nanojunctions by using EM spectroscopy. The critical voltage was determined to be 0.35 V from the peak of the obtained EM spectrum, which is close to the atom diffusion potential for clean Cu surfaces. It was also demonstrated that balli…
Abstract The molecular‐level response of RDX to hydrostatic compression was examined in a diamond anvil cell using Raman spectroscopy. The pressure‐induced alterations in spectral profiles of the CN stretching mode (886 cm−1) were studied up to 8.3 GPa. At pressures near 4.4 GPa, several changes of the CN stretching…
Abstract Octahedral Fe3O4microcrystals were synthesized using a triethanolamine‐assisted route under hydrothermal conditions. The chemical compositions and morphologies of the as‐prepared samples were characterized in detail by X‐ray diffraction (XRD) and scanning electron microscopy (SEM). During the hydrothermal pro…
The dynamic susceptibility ${\ensuremath{\chi}}^{\ensuremath{''}}(\ensuremath{\Delta}E)$, measured by inelastic neutron-scattering measurements, shows a broad peak centered at ${E}_{max}=15\text{ }\text{meV}$ for the cubic actinide compound ${\text{URu}}_{2}{\text{Zn}}_{20}$ and 7 meV at zone center and at the (1/2, 1…
Based on a generalized theory of charge transport in organic crystals we investigate the motion of polarons of arbitrary size. Within this theory, we analyze the influence of characteristic electronic, vibronic, and thermal energies and their role for the transport regimes. The polaron bandwidth is identified as the c…
The balance between the orbital and spin magnetic moments of ${\text{Sm}}^{3+}$ in the zero-moment ferromagnet ${\text{Sm}}_{0.974}{\text{Gd}}_{0.026}{\text{Al}}_{2}$ has been studied using x-ray magnetic circular dichroism (XMCD) at the $\text{Sm}\text{ }{M}_{4,5}$ edges. The difference in the XMCD multiplet structur…
Enzyme-catalyzed polycondensation for the synthesis of polyester prodrugs of ketoprofen was reported. Lipase acrylic resin from Candida antarctica (CAL-B) was used to synthesize the linear polyesters with pendent ketoprofen groups based on ketoprofen glycerol ester, poly(ethylene glycol), and divinyl sebacate. The pro…
Abstract As silicon has a large refractive index and low loss in infrared wavelengths, it becomes an important optical material that has been widely used for integrated photonics applications. In this paper, we present some of our recent experimental works on infrared two‐dimensional air‐bridged silicon photonic cryst…
PURPOSE: Delayed gadolinium-enhanced MR imaging of cartilage is used to quantify the proteoglycan loss in early osteoarthritis. It is assumed that T1 after Gd-DTPA administration in the near equilibrium state reflects selective proteoglycan loss from cartilage. To investigate the influence of the collagen network inte…
Abstract The release process of a water soluble, model drug (proxyphylline) with small, yet not negligible osmotic action, from silicone rubber (SR) matrices is presented. The kinetics of release for different initial loads of the drug is supplemented by measurements of the kinetics of the concurrent water uptake. To…
In this letter, we demonstrate the millimeter-wave power performance from N-polar GaN-based metal-insulator-semiconductor high-electron-mobility transistors. The device consists of a GaN spacer structure with an AlN barrier to reduce the alloy scattering. High Si doping in GaN without excessive surface roughening has…
We propose new strategy to facilitate the fabrication of conjugated polymer fiber with higher oriented structures, which focused on electrospinning of a blend solution of regioregular poly(3-hexylthiophene) (rr-P3HT) and poly(vinyl pyrrolidone) (PVP). SEM observation revealed that the blend system forms homogeneous co…
The reactions of nitrile complexes of the [Re(6)(μ(3)-Se)(8)](2+) core-containing clusters, [Re(6)(μ(3)-Se)(8)(PEt(3))(n)(CH(3)CN)(6-n)](2+) [n = 5 (1); n = 4, cis- (2) and trans- (3); n = 0 (4)], with organic azides C(6)H(5)CH(CH(3))N(3) and C(6)H(5)CH(2)N(3) produced the corresponding cationic imino complexes of the…
The room temperature photoinduced reactivity of liquid ethanol has been studied as a function of pressure up to 1.5 GPa by means of a diamond anvil cell. Exploiting the dissociative character of the lowest electronic excited states, reached through two-photon absorption of near-UV photons (350 nm), irreversible reacti…
In this paper, we have developed a simple sensitivity score, based on the relative population of solvent molecules near each residue, to analyze the detailed motions of both urea and water around the hen egg-white lysozyme protein (W62G mutant) during its early stage of urea-induced unfolding for a better understandin…
The interest in low-$Z$ superconducting analogs to ${\text{MgB}}_{2}$ has motivated a search for new high-pressure phases in metal boride systems. Phases of LiB have electronic features intermediate between those of ${\text{MgB}}_{2}$ and intercalated graphites, and are expected to exhibit superconductivity. A previou…
Abstract Thermites prepared from nanoparticles are currently the subject of growing interest due to their increased performances compared to classical micrometer‐sized thermites. Here, we studied the combustion behavior of energetic composite composed of Al and chromium (III) oxide (Cr2O3) as function of the oxide par…
Semiconducting${\rm TiO}_{2}\!\!-\!\!{\rm B}$nanowires were synthesized and their chemical sensor performance was studied. It was found that the${\rm TiO}_{2}\!-\!{\rm B}$nanowires exhibited a large and reversible change in electrical resistivity when exposed to trace vapor of nitroaromatic and nitroamine explosives.…
We present neutron inelastic-scattering results on the low-temperature magnetic state of the frustrated-hyperkagome compound ${\text{Gd}}_{3}{\text{Ga}}_{5}{\text{O}}_{12}$ gadolinium gallium garnet (GGG). Our neutron-scattering studies reveal a remarkable range of time scales. Short-range spatial correlations appear…
We present here a theoretical study of the phosphoryl transfer catalytic mechanism of protein kinase A, which is the best known member of the large protein kinase family. We have built different theoretical models of the complete PKA-Mg(2)-ATP-substrate system to explore the two most accepted reaction pathways, using…