Materials Literature
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Quadratisch, praktisch, gut: Squarain-Rotaxane ähneln in ihren photophysikalischen Eigenschaften stark dem gängigen Cy-5-Fluorophor, sind jedoch viel lichtbeständiger und zeigen im aggregierten Zustand keinerlei Selbstlöschung. Sondenmoleküle mit Squarain-Rotaxan-Einheiten (siehe Beispiel) erwiesen sich als leistungsf…
The role of hither-to-fore unrecognized long-range hydrogen bonds between main-chain amide hydrogens and polar side chains on the stability of a well-studied (betaalpha)8, TIM barrel protein, the alpha subunit of tryptophan synthase (alphaTS), was probed by mutational analysis. The F19-D46 and I97-D124 hydrogen bonds…
Abstract Nonlinear optical material of L‐alaninium oxalate (LAO) has been synthesized and single crystals are grown by slow evaporation technique. The solubility data of LAO is determined in water. Single crystal X‐ray diffraction study showed that LAO belongs to orthorhombic system with a non‐centrosymmetric space‐gr…
Abstract The kinetics of the formation of lanthanide(III) complexes of the neutral ligand DOTAM differ considerably from those of DOTA and its derivatives, which contain negatively charged pendant groups. Formation of the complexes [Ln(DOTAM)] 3+ occurs upon direct encounter of the Ln 3+ ions and the fully deprotonate…
Abstract The crystalline material of acenaphthene picrate (ACP) was synthesized and the single crystals of the title compound grown by slow evaporation solution growth technique. The solubility of the complex compound was estimated using different solvents as chloroform, ethanol, (1:1) chloroform ‐ acetone mixture. Th…
Using grand canonical Monte Carlo simulations, we study the crystallization of colloidal hard spheres under gravity. More specifically, we investigate the nature of the freezing transition as a function of gravity and chemical potential of the hard spheres. We find a discontinuous freezing transition where several flu…
In this report, the photophysical properties of self-assembled [Cu(2)(5-OH-bdc)(2)L(2)](12) [where (5-OH-bdc)(2-) = 5-hydroxybenzene-1,3-dicarboxylate and L is a dimethyl sulfoxide, methanol, or water ligand] hydroxylated nanoballs (OH-nanoball) were examined in methanol using optical absorption and steady-state and t…
When dry Cd 2+ -exchanged zeolites Y are exposed to dry H 2 S under a rigorously anhydrous condition, CdS quantum dots (QDs) are formed in the supercages of zeolite−Y regardless of the loading levels of CdS from 0.01% to 32% and regardless of the Si/Al ratio of zeolite−Y between 1.8 and 2.5. The absorptions with the m…
The heat capacity and entropy of cubic and hexagonal $\mathrm{Sr}\mathrm{Mn}{\mathrm{O}}_{3}$ have been determined by relaxation calorimetry and by density functional theory. A main aim was to study the effect of temperature and thus entropy on the relative stability of corner versus face sharing of octahedra in perov…
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…