Materials Literature
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Polymeric carbon nanotube (CNT)−liquid crystal composites were prepared using single-walled CNTs (SWNTs) and a polymerizable surfactant (dodecyldimethylammonium ethyl methacrylate, DDAM). The pristine SWNTs were dispersed in a lyotropic liquid crystal (LC) of DDAM (70 wt % in water). The bare lyotropic LC of DDAM and…
Surface x-ray diffraction has been employed to quantitatively assess the surface structure of $\ensuremath{\alpha}{\text{-Cr}}_{2}{\text{O}}_{3}(0001)$ as a function of oxygen partial pressure at room temperature. In ultrahigh vacuum, the surface is found to exhibit a partially occupied double layer of chromium atoms.…
Abrikosov-Gor'kov work on pairbreaking in isotropic materials is generalized to anisotropic Fermi surfaces and order parameters. New scaling relations for states with a strong pairbreaking are found for the specific-heat jump $\ensuremath{\Delta}C\ensuremath{\propto}{T}_{c}^{3}$; for the penetration depth that deviate…
We investigate superconductivity in the compound FeSe(0.5)Te(0.5) and in its transition-metal-substituted derivatives Fe(1-x)TM(x)Se(0.5)Te(0.5), where x = 5% and the substituent ions studied were Mn, Co, Ni, Cu and Zn. Electronic and magnetic measurements indicate that doping with Mn or by Co acts respectively to cau…
Knife is the most commonly used single weapon in the UK, being 32% of the weapons used in violent incidents. Studies reveal that the majority (63.3%) of the knife-inflicted wounds were slash-type and could be disfiguring or life threatening if the blood vessels are ruptured. The stab-resistant armors currently availab…
Abstract A hybrid numerical–experimental approach is used to characterize the macroscopic mechanical behavior of polymeric foams. The method is based on microstructural characterization of foams with X‐ray computed tomography (CT) and conversion of the data to finite element (FE) models. The 2D models are created from…
Co films were selectively deposited as Cu capping layers by chemical-vapor-deposition technique. X-ray fluorescence spectroscopy determined the Co deposition selectivity as a function of the deposition temperature and substrate materials. The Co/Cu interfacial property was characterized and revealed no detectable oxyg…
Despite extensive effort, the drug target dihydrodipicolinate synthase (DHDPS) continues to evade effective inhibition. We used NMR spectroscopy to examine the substrate specificity of this enzyme and found that two pyruvate analogues previously classified as weak competitive inhibitors were turned over productively b…
To produce cellulose regenerated fibres with high mechanical properties at low cost, sugarcane bagasse was chosen as a cheap raw material. In this study, bagasse was dissolved in N-methylmorpholine- N-oxide (NMMO) 0.9 hydrate, and fibres were prepared by the dry jet-wet spinning method by using dilute water/NMMO mixtu…
Copper containing layered double hydroxides (LDHs) with less than 1 atom % Cu along with different cobivalent ions such as magnesium, zinc, nickel or cobalt at (Cu+M(II))/Al atomic ratio 3.0 were synthesized. Calcination of these materials offered mixed metal oxides (refereed here as CLDHs) without any discrete copper…
Abstract The anisotropic mechanical response of oriented polymer glasses is studied through simulations with a coarse‐grained model. Systems are first oriented by uniaxial compression or tension along an axis. Then the mechanical response to subsequent deformation along the same axis or along a perpendicular axis is m…
Abstract Ammonium polyphosphate (APP)/montmorillonite (MMT) nanocompounds were prepared. The crystal forms and morphologies of the nanocompounds were studied by XRD, FTIR, SEM, and TEM. The APP/MMT nanocompounds were applied to intumescent flame‐retarded polypropylene (PP) composites. The PP composites were studied by…
In this paper, we study a macroscopic system of electrically interacting metallic beads organized as a sequence along an annulus. A random mechanical shaking mimics the thermal excitation. We exhibit non-Fickian diffusion (single-file diffusion) at large time. We measure the mobility of the particles and compare it to…
Abstract We have proposed recently that the mechanical properties of nano‐filled elastomers are governed by the kinetics of rupture and re‐birth of glassy bridges which link neighboring nanoparticles and allow for building large rigid clusters of finite life‐times. The latter depend on parameters such as the temperatu…
Microscopic and spectroscopic techniques at near-atmospheric pressures have been used in recent years to investigate CO oxidation over Pt-group metals. New insights have been obtained that allow broadening of the understanding of this reaction beyond the ultrahigh vacuum regime where it is well-understood. However, ne…
Three sesquiterpenes, 3-O-(3’-acetoxy-2’-hydroxy-2’-methylbutyryl)cuauthemone (1), 4-O-acetylcuauthemone-3-O-angelate (2), 4-O-acetylcuauthemone 3-O-(2’-hydroxy-2’-methyl-3’-acetoxybutyrate) (3) and two flavones, 3’,4’,5,7-tetrahydroxy-3,6-dimethoxyflavone (4), 3’,5,6-trihydroxy-3,4’,7-trimethoxyflavone (5) were isola…
Abstract Polytetrafluroethylene (PTFE) composites filled with CeO 2 were prepared by powder processing technique. The PTFE is used as the matrix and the loading fraction of CeO 2 in the composite varied up to 0.6 volume fraction. The thermal conductivity and coefficient of thermal expansion were studied in relation to…
Abstract A comprehensive experimental study together with statistical analysis was performed to identify the optimal process conditions, materials selection, and curing system for the production of thermoplastic vulcanizates (TPVs) based on EPDM rubber and polypropylene. Two types of curing systems were studied togeth…
Abstract Rearrangement reactions between Ln(MQ) 3 and AE(MQ) 2 (MQ = 8‐quinaldinolate) at 200–300 °C in a 1,2,4,5‐tetramethylbenzene (TMB) flux afforded the homoleptic heterobimetallic complexes [Ln 2 AE(MQ) 8 ] (Ln = Eu, Gd, Tb, Er with AE = Mg; Ln = La, Eu with AE = Ca) and [Eu 3 Ba(MQ) 11 ] · 2TMB. From an attempt…
Besides the use of the most sophisticated equipment, accurate nanometrology for the most advanced CMOS processes requires that the physics of image formation in scanning electron microscopy (SEM) being modeled to extract critical dimensions. In this paper, a novel Monte Carlo simulation code based on the energy stragg…