Materials Literature
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Amphiphiles are molecules which have both hydrophilic and hydrophobic parts. In water- and/or oil-like solvent, they self-assemble into extended sheet-like structures due to the hydrophobic effect. The free energy of an amphiphilic system can be written as a functional of its interfacial geometry, and phase diagrams c…
Here we report the first synthesis of Dy(OH)(3) nanotubes by facile hydrothermal treatment of bulky Dy(2)O(3) crystals. Dy(OH)(3) nanotubes were calcined to produce Dy(2)O(3) nanotubes. Ho(OH)(3) and Ho(2)O(3) nanotubes were also obtained by the same method. The growth of nanotubes occurred through a dissolution-recry…
The apparent contact angle of a drop on a rough surface is often modeled using either Wenzel's or Cassie's formulas. Previous experiments are not conclusive regarding which formula to use and when. This information is critical in designing a superhydrophobic substrate for applications in microscale devices. A drop on…
The epidermis of the amphibious mudskipper fish, Boleophthalmus pectinirostris, consists of three layers: the outermost layer, middle layer and stratum germinativum. The outermost layer consists of polygonal cells or rather flattened cells arranged in one to eight layers. In between these cells, round small cells and…
A quantitative relationship is established between the electro‐optic performance (reflectivity, transmittance, threshold field, response time) of a polymer‐stabilized liquid‐crystal and the network morphology of the cholesteric textures (see Figure). By analysis of independent preparation series, varying curing temper…
Abstract Reaction of the low‐spin complex [Ni(dsdm)] with Fe 2 CO 9 results in the unique trinuclear cluster [Ni(dsdm){Fe(CO) 3 } 2 ]. NMR spectroscopy shows that the structure is diamagnetic, and, moreover, that the complex is stable in solution and C 2 ‐symmetric. The X‐ray structure reveals short distances between…
Abstract The complex [Cp* 2 Mo 2 O 5 ] (Cp* = η 5 ‐C 5 Me 5 ) and its electrochemical reduction products in acetic acid/acetate‐buffered (pH = 4.0) water/methanol solutions were investigated by combined electrochemical (EC) flowcell and on‐line electrospray ionization mass spectrometry (ESI‐MS). Mono‐, di‐, tri‐, and…
The polydentate N-donor ligand 2,4,6-tris(3,5-dimethylpyrazol-1-yl)-1,3,5-triazine (Me(2)-TpzT) has been used to synthesize the new palladium derivatives Pd(R)(2)(Me(2)-TpzT), R = C(6)F(5), 1; R = m-C(6)ClF(4), 2. In the case of complex 2, four different atropisomers have been detected at low temperature. The new comp…
We succeeded in observing ferromagnetic (FM) microdomains in the phase-separated state found in Cr-doped ${\mathrm{Nd}}_{0.5}{\mathrm{Ca}}_{0.5}{\mathrm{MnO}}_{3}$ by low-temperature Lorentz microscopy. The presence of the FM microdomains with the size of 20--30 nm were found in ${\mathrm{Nd}}_{0.5}{\mathrm{Ca}}_{0.5}…
Arrays of TiO 2 nanopillars have been prepared by photochemically etching a TiO 2 single crystal that had been previously imprinted with a corresponding array of dimples using SiC molds. The pillars have a high aspect ratio (see scanning electron microscopy (SEM) image in Figure) and the method is simple and suitable…
The unusual magnetotransport properties of manganites are widely believed to be caused by mixed-phase tendencies and concomitant percolative processes. However, dramatic deviations from ``standard'' percolation have been unveiled experimentally. Here, a semiphenomenological description of Mn oxides is proposed based o…
Abstract A new and highly reproducible method to obtain mesostructured titania materials is introduced in this contribution. The mesostructured titania is obtained by employing self‐assembled structures of non‐ionic alkyl‐poly(ethylene oxide) surfactants as templates. The materials are produced without additional solv…
We numerically analyze the scaling behavior of experimentally accessible dynamical relaxation forms for networks modeled through finite Sierpinski-type lattices. Previous work has established unequivocally for such lattices that in the Rouse picture both the mechanical and the dielectric relaxation forms scale in freq…
The effects of confinement on the director field configurations are studied for a spherical particle immersed in a nematic liquid crystal. The liquid crystal is confined in a cylindrical geometry and the particle is located on the axis of symmetry. A finite element method is used to minimize the Frank free energy for…
Bi 3.25 La 0.75 Ti 3 O 12 (BLT) thin films were grown on Pt/Ti/SiO2/Si and on LaNiO3 (LNO) buffered Pt/Ti/SiO2/Si substrates using sol-gel processing. Scanning electron micrographs showed the BLT films are composed of peg-like or platelet-like grains depending upon annealing temperature and the substrate type. Large p…
Hollow spheres of mesostructured lead titanate, denoted as PTM-1, have been prepared via a combined oil-in-water emulsion mediated and neutral amine supermolecular templated route. The variety of reaction temperatures and KOH concentrations indicates hollow spheres can be formed under a very critical condition. The st…
3,3'-Dimethoxy-2,2'-bipyrrole (1) and 4,4'-dimethoxy-2,2'-bipyrrole (2) were obtained in short sequences and good yields from N-benzyl-3-hydroxypyrrole-2,4-dicarboxylic acid. The key intermediate leading to 1 is an N-benzyl-3-methoxypyrrole, which is dimerized by lithiation and oxidation with NiCl(2). The formation of…
Due to its large surface area and strongly attractive potential, a bundle of carbon nanotubes is an ideal substrate material for gas storage. In addition, adsorption in nanotubes can be exploited in order to separate the components of a mixture. In this paper, we investigate the preferential adsorption of ${\mathrm{D}…
Temperature dependent optical spectra are reported for $\ensuremath{\beta}\mathrm{\text{\ensuremath{-}}}{\mathrm{N}\mathrm{a}}_{0.33}{\mathrm{V}}_{2}{\mathrm{O}}_{5}$. The sodium ordering transition at ${T}_{\mathrm{N}\mathrm{a}}=240\text{ }\text{ }\mathrm{K}$ and, in particular, the charge ordering transition at ${T}…
Colloidal ZnSe nanocrystals are coated with a ZnS shell and are investigated by means of time-resolved photoluminescence spectroscopy. These nanocrystals are stable against photooxidation and have photoluminescence quantum efficiencies around 15% even months after the synthesis. Recombination processes are investigate…