Materials Literature
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The main component of natural teeth was determined many years ago as calcium phosphate, mostly in the form of hydroxyapatite with different crystallites. In the past, the method used in tooth crystal investigation has been mainly powder X-ray diffraction analysis, but this method has its drawbacks, i.e. the destructio…
Abstract An interesting class of materials is mesoporous organosilica materials containing a bridging, organic group along the pore‐surface. Such materials are prepared from silsesquioxane precursors of the type (R′O) 3 Si‐R‐Si(OR′) 3 where R is the bridging organic group of interest, in combination with a lyotropic p…
We report a simple method to prepare biodegradable polymer−amphiphile complexes by solution mixing of poly(propylene carbonate) (PPC) with octadecanoic acid (OA). The complexes were characterized by combination of thermogravimetry analysis (TGA), differential scanning calorimetry (DSC), wide-angle X-ray diffraction (W…
Cu (I) and Ag (I) complexes of the fluorinated triazolate ligand [3,5-(C3F7)2Tz](-) have been synthesized using the corresponding metal(I) oxides and the triazole. They form pi-acid/base adducts with toluene, leading to [Tol][M3][Tol] ([Tol]=toluene; [M3]={[3,5-(C3F7)2Tz]Cu}3 or {[3,5-(C3F7)2Tz]Ag}3) type structures.…
By using first-principle molecular dynamics within density functional theory, we study the structural properties of amorphous $\mathrm{Ge}{\mathrm{Se}}_{2}$ at a temperature $T$ of $300\phantom{\rule{0.3em}{0ex}}\mathrm{K}$. For each property, a statistical average is obtained from six independent partial averages tak…
A Gaussian chain model of poly (styrene)−poly (isoprene) (PS−PI) block copolymer with a dissipative particle dynamics (DPD) simulation was employed to study the formation of specific characteristic structures such as body-centered-cubic (BCC), hexagonal packed cylinders (HPC), ordered bicontinuous double diamond (OBDD…
Phase II: Eine neue Methode der Zweiphasenpfropfung an der Grenzfläche einer Pickering-Emulsion führt zur Bildung von Janus-Kolloiden (siehe Schema; ATRP: Atomtransferradikalpolymerisation), aus denen sich durch bevorzugtes Wachstum eines Materials in spezifischen Bereichen des ursprünglichen Kolloids Janus-Kompositko…
The oxidation of the platinum (111) single crystal surface and the formation of platinum dioxide have been studied by in situ surface x-ray diffraction and x-ray reflectivity. At an oxygen partial pressure of 500 mbar and at temperatures from 520 to 910 K, the experiments disclose the growth of two atomic layers of a…
The hydrothermal formation of mixed nanoscale W/Mo-oxides with the hexagonal tungsten bronze (HTB) structure has been investigated by in situ EDXRD (energy dispersive X-ray diffraction). Compared to the binary oxide systems, they display intermediate kinetics with a nucleation-controlled mechanism dominated by the slo…
Natural polymers are a very interesting matrix to obtain solid polymeric electrolytes (SPE). The principal advantage comes from their particularly interesting biodegradation properties due to the natural origin and also very low cost and good physical and chemical properties. These polymers contain heteroatoms in thei…
Organic field-effect transistors are important applications of thin films of molecular materials. A variety of materials have been explored for improving the performance of organic transistors. The materials are conventionally classified as p-channel and n-channel, but not only the performance but also even the carrie…
The polarized reflectivity spectra of $\mathrm{Cd}\mathrm{Mo}{\mathrm{O}}_{4}$ single crystals with a scheelite structure and of $\mathrm{Cd}\mathrm{W}{\mathrm{O}}_{4}$ with a wolframite structure are measured in the $3--30\phantom{\rule{0.3em}{0ex}}\mathrm{eV}$ range by using synchrotron radiation. The spectra of opt…
Using a combined experimental and theoretical approach, we show that a thin RhO 2 oxide film forms on a Pt 25 Rh 75 (100) surface at elevated oxygen pressures and temperatures prior to the bulk oxidation. By the use of in situ surface x-ray diffraction under realistic CO oxidation reaction conditions, we show that the…
Abstract The morphological and rheological properties of thermoplastic elastomer nanocomposites (TPE nanocomposites) were studied using different viscosities of polypropylene (PP) and ethylene‐propylene‐diene monomer (EPDM) rubber content (20, 40, 60 wt%). The components, namely EPDM, PP, Cloisite 15A, and maleic anhy…
A 4f−3d heterometallic polymeric coordination compound [{Dy(hfac) 2 (CH 3 OH)} 2 {Cu(dmg)(Hdmg)} 2 ] n ([Dy 2 Cu 2 ] n; H 2 dmg = dimethylglyoxime; Hhfac = 1,1,1,5,5,5-hexafluoropentane-2,4-dione) was synthesized, and the X-ray crystallographic analysis shows that the structure is isomorphous to the known ferrimagneti…
Platinum-group metals and noble metals play an important role in catalysis, for total oxidation as well as for partial oxidation reactions. Only in recent years have advances in microscopic, spectroscopic and computer simulation techniques made it possible to investigate the interaction of oxygen with metallic substra…
Abstract Cationic conjugated polymers (CCPs) with different charge densities are synthesized via Suzuki polymerization. The CCPs show similar optical properties in aqueous solutions but obvious difference in fluorescence resonance energy transfer (FRET) to Texas Red‐labeled single‐stranded DNA (ssDNA‐TR). Both CCP and…
Surfaces that respond to pH and UV stimuli are fabricated from self-assembled monolayers (SAMs) of a malachite green derivative on a rough surface (see figure). The wetting properties of the SAMs exhibit an uncommon response to pH and UV illumination, and range from superhydrophobicity to superhydrophilicity.
Heterogeneous oxidation catalysis on ruthenium: bridging the pressure and materials gaps and beyond, Assmann, J, Narkhede, V, Breuer, N A, Muhler, M, Seitsonen, A P, Knapp, M, Crihan, D, Farkas, A, Mellau, G, Over, H
Three new coordination polymers [Cu5(N3)10(en)2]n (1), [Cu6(N3)12(en)4]n (2), and [Cu4(N3)8(en)4]n (3) have been synthesized in a controlled manner by treatment of a 1:2 mixture of Cu(NO3)2 and NaN3 with varying amount of ethylenediamine (en). Single-crystal structure analyses clearly indicated that the puckered Cu4 b…