Materials Literature
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A nano-polycrystalline diamond was synthesized from graphite by direct conversion under high pressure. The nano-polycrystalline diamond consists of nanosized diamond grains oriented in random directions and has higher toughness and more isotropic mechanical properties than the single-crystal diamond. We generated the…
A ceramic body with hierarchical meso–macro‐porosity was prepared by depositing a mesoporous silica coating on the walls of a macroporous silicon oxycarbide (SiOC) foam. Scanning electron microscopy, transmission electron microscopy, and small‐angle X‐ray scattering revealed that a uniform mesoporous coating was depos…
Ti $K$ edge x-ray absorption near-edge structure (XANES) measurements across the pressure induced ferroelectric--paraelectric phase transition in $\mathrm{Pb}\mathrm{Ti}{\mathrm{O}}_{3}$, a prototypical ferroelectric perovskite, are reported. A quantitative analysis of the XANES allows us to obtain the relative local…
A combined experimental and theoretical study of the photophysical properties and excited-state dynamics of semiconducting single-wall carbon nanotubes (SWNTs) is reported. Steady-state and time-resolved fluorescence data as a function of temperature are explained on the basis of a manifold of four low-lying singlet e…
Using both numerical simulations and an approximate analytical theory we describe a flexoelectric-induced instability in a thin nematic liquid crystal layer with asymmetric boundary conditions subjected to an applied electric field. The dependence of the threshold value of the electric field on principal material para…
By in situ energy-dispersive X-ray absorption spectroscopy (EDXAS) and X-ray diffraction (XRD), we analyzed the evolution of niobium in a MgH 2 /Nb 2 O 5 system based on high-energy ball milling during hydrogen cycling. The high time resolution of the EDXAS method allowed us to monitor fast sample changes during this…
We studied the oxidation of Cu(410) using x-ray photoemission spectroscopy performed with synchrotron radiation. We demonstrate that a hyperthermal ${\mathrm{O}}_{2}$ molecular beam is an efficient tool to fabricate Cu oxide thin films at room temperature (RT) and even lower temperatures. At RT, mainly ${\mathrm{Cu}}_…
Time-dependent density-functional theory/localized density matrix method (TDDFT/LDM) was developed to calculate the excited state energy, absorption spectrum and dynamic polarizability. In the present work we generalize it to calculate the dynamic hyperpolarizabilities in both time and frequency domains. We show that…
Small-diameter synthetic vascular grafts of expanded poly(tetrafluoroethylene) (ePTFE) polymer concern one of the most common alternatives for the replacement of diseased vessels. However, high failure rates arise especially due to the lack of endothelial cells (ECs). EC seeding was developed to build a monolayer on t…
The linear-type heterometallic tetramers, [Mn(III)(2)(5-MeOsaltmen)(2)M(II)(2)(L)(2)](CF(3)SO(3))(2) x 2H(2)O (MII = Cu, 1a; Ni, 2a), where 5-MeOsaltmen(2-) = N,N'-(1,1,2,2-tetramethylethylene) bis(5-methoxysalicylideneiminate), and H(2)L = 3-{2-[(2-hydroxy-benzylidene)-amino]-2-methyl-propylimino}-butan-2-one oxime,…
This article deals with evolution of packed foodstuff quality with time of storage. The transport of small volatile molecules (flavor compounds, water vapor, and gases) into and through flexible food packaging materials is reviewed, as well as their multiple transfers. Sorption, diffusion, and permeation phenomena are…
Many-body effects in solids are ultimately related to the correlation among electrons, which can be probed by double photoelectron emission. We have investigated the electron pair emission from a Cu(111) surface upon photon absorption. We are able to observe for the first time the full extension and shape of a depleti…
A combination of broadband dielectric $({10}^{\ensuremath{-}2}\phantom{\rule{0.3em}{0ex}}\mathrm{Hz}--{10}^{9}\phantom{\rule{0.3em}{0ex}}\mathrm{Hz})$ and specific heat $({10}^{\ensuremath{-}3}\phantom{\rule{0.3em}{0ex}}\mathrm{Hz}--2\ifmmode\times\else\texttimes\fi{}{10}^{3}\phantom{\rule{0.3em}{0ex}}\mathrm{Hz})$ sp…
For the treatment of vascular disease, the major cause of death in Western society, there is an urgent need for tissue-engineered, biocompatible, small calibre artery substitutes that restore biological function. Vascular tissue engineering of such grafts involves the development of compliant synthetic or biomaterial…
X-ray absorption (XAS) and core level photoelectron spectroscopy are versatile tools to site selectively study the unoccupied density of states and bonding environment. Hence, they are widely applied to study single-wall carbon nanotubes (SWCNTs) as archetypes of one-dimensional solids. However, their van Hove singula…
Nanocomposite oxides of Ce x Zr 1- x O 2 dispersed over alumina (Al 2 O 3 ), silica (SiO 2 ), and titania (TiO 2 ) have been synthesized by a deposition coprecipitation method. The physicochemical characterization was carried out by X-ray diffraction (XRD), Raman spectroscopy, high-resolution electron microscopy (HREM…
Calming the radicals: Aminyl radicals may one day be useful oxidation catalysts if their thermodynamic instability can be overcome, for example, through complexation with a metal. The semiquinone–anilino-radical and catechol–anilino-radical complexes 1 and 2 have now been prepared and the anilino-radical character of…
The half-Heusler compounds ErPdSb and YPdSb were studied by means of x-ray diffraction, magnetic susceptibility, electrical resistivity, magnetoresistivity, thermoelectric power, Hall effect, thermal conductivity, and specific heat measurements, performed in the temperature range $1.5--300\phantom{\rule{0.3em}{0ex}}\m…
Abstract Metallopolymere haben sich in den letzten Jahrzehnten zu einem ergiebigen Forschungsgebiet entwickelt. Besonders die Polyferrocenylsilan(PFS)‐Chemie hat sich dabei rasant entwickelt. Nach Entdeckung der thermischen Ringöffnungspolymerisation (ROP) von Sila[1]ferrocenophanen konnten Polyferrocenylsilane bald a…
Pure and Nb‐substituted CaCu 3 Ti 4− x Nb x O 12+ x /2 (CCTO, x =0, 0.02, 0.1, 0.2, 0.4) ceramics were prepared by a conventional solid‐state sintering, and their electric and dielectric properties were investigated using an impedance analyzer. A single‐phase CCTO was obtained up to x =0.2 Nb substitution and the latt…