Materials Literature
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Komplett gekuppelt: Die Acylierung von Dimethylamin durch Kupplung mit Formaldehyd gelingt mit fast kompletter Selektivität bei niedriger Aktivierungsenergie und niedrigen Bedeckungen mit adsorbierten O-Atomen auf metallischem Gold. Der Sauerstoff erzeugt die aktivierte Zwischenstufe (CH3)2N(a), die das Carbonyl-Kohle…
A novel molecular phenomenon is predicted on the basis of trends identified in an ab initio density functional theory study of the electronic and geometric structure of the hexagonal shaped zigzag edged graphene hydrocarbon molecules C(6m(2) )H(6m)(m=2,...,10). Electrons in the interior organize to form a graphene cor…
Human hair is a complex nanocomposite fiber whose physical appearance and mechanical strength are governed by a variety of factors like ethnicity, cleaning, grooming, chemical treatments and environment. Characterization of mechanical properties of hair is essential to develop better cosmetic products and advance biol…
Abstract Single colloidal quantum dots (QDs) are increasingly exploited as triggered sources of single photons. This review reports on recent results on single photon sources (SPS) based on colloidal quantum dots, whose size, shape and optical properties can be finely tuned by wet chemistry approach. First, we address…
Electrochemical impedance spectroscopy was performed on low temperature solid oxide fuel cells with yttria-stabilized zirconia electrolytes and different electrode materials and morphologies. Three loops are seen in a Nyquist plot; the high frequency loop is attributed to the electrolyte and series resistance. The int…
We experimentally study the behavior of micrometer-sized prolate ellipsoidal particles dispersed in a nematic liquid crystal. The latter is an aqueous solution of rodlike micelles. When embedded into such a solvent, ellipsoids with small enough aspect ratios aggregate to form anisotropic structures oriented at an angl…
Alloy 22 (N06022) is a Ni–Cr–Mo alloy that offers an outstanding corrosion resistance in a wide variety of highly corrosive environments. In the present work, the general corrosion of alloy 22 in the passive and active states and the transition from passive and active states were studied in acidic chloride solutions a…
In situ x-ray diffraction and Raman scattering experiments using a diamond anvil cell revealed high-pressure forms of $\text{Bi}M{\text{O}}_{3}$ ($M=\text{Al}$, Ga, and In) under hydrostatic conditions at room temperature. Various perovskite-type structures are found in each compound under pressure up to 11 GPa. Howev…
The application of quantum dots (QDs) in various biomedical areas requires detailed studies of their toxicity. We report a new strategy for probing the biocompatibility of these nanocrystals, namely, a dynamic investigation of cellular uptake images, cell growth curves, metabolic activity changes, and apoptosis aspect…
This paper reports the effect of halogen substituents on the morphology of self-assembling phenazines. Asymmetrically substituted phenazines with decyloxy substituents and halogens (F, Cl, Br, and I) were prepared. Thermal properties were characterized with differential scanning calorimetry (DSC), while polarized opti…
Anaerobic biodegradation in sewage sludge of polyhydroxybutyrate (PHB) was investigated. Evolved gaseous carbon was measured to assess biodegradability according to ASTM D5210. Mass-loss experiments were performed to determine degradation kinetics. Changes in the polymer properties were investigated. The impact of a n…
High-κ dielectrics are intensively investigated as a replacement for in integrated nanoelectronics. In particular, for the next generation of dynamic random access memory metal–insulator–metal capacitors, the Ta- and Nb-based oxides are among the most interesting candidates that display a relatively large dielectric c…
Porous silica microspheres have wide applications in various areas. It has been a challenge to produce uniform silica microspheres with tunable pore size. In this study, uniform porous silica microspheres were synthesized using a modified Stöber method. Cetyltrimethylammonium bromide (CTAB) was used as a cationic surf…
We have found that bent-core liquid crystalline materials show exceptionally large intrinsic flow birefringence in their isotropic liquid phase. This effect is more than 100 times larger than typical values measured for low molecular weight liquid crystals. The specific flow birefringence (i.e., normalized by the flow…
The syntheses, crystal structures, and magnetochemical characterization are reported for two new Mn clusters, [Mn(7)O(3)(OH)(3)(O(2)CBu(t))(7)(dmhmp)(4)] (1) and [Mn(12)O(7)(OH)(OMe)(2)(O(2)CPh)(12)(dmhmp)(4)(H(2)O)] (2). They were obtained from the use of 2-(pyridine-2-yl)propan-2-ol (dmhmpH), a more bulky version of…
Docetaxel (DTX) is one of the most effective antineoplastic drugs. However, its current clinical administration, formulated in tween80, causes serious side effects. This study is focused on preparation and evaluation of poly(lactide-co-glycolide) nanoparticles (NPs) containing DTX to remove tween80. Drug encapsulation…
A periodic dependence on the Au segment length is observed for the electric field at the nanogap of long-segment Au nanostructures. An optimized geometry of these platforms leads to an intense surface-enhanced Raman scattering (SERS) signal at the nanogap (see picture). Information about molecular transport and vibrat…
Highly stable photoluminescent (PL) nanocomposite multilayers including quantum dots (see picture) were prepared using a nucleophilic substitution reaction. The assembly of functional nanoparticles in a nonpolar solvent can allow selective deposition and induce a hydrophobic surface with a water contact angle above 11…
Abstract Substoichiometric spinel cobalt ferrite octahedra were prepared by using a versatile coprecipitation/air oxidation method in a low‐temperature aqueous system without any surfactants and directing agents. The microstructure, magnetic and microwave electromagnetic properties of the resultant products as functio…
The static polarizability alpha and first hyperpolarizability beta tensors of crystalline urea and the corresponding first-(chi((1))) and second-(chi((2))) susceptibilities are calculated and compared to the same quantities obtained for the molecule by using the same code (a development version of CRYSTAL), basis set,…