Materials Literature
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Can magnetic interactions between single-molecule magnets (SMMs) in a crystal establish long-range magnetic order at low temperatures deep in the quantum regime, where the only electron spin fluctuations are due to incoherent magnetic quantum tunneling (MQT)? Put inversely: can MQT provide the temperature dependent fl…
Recently, a novel, neural-networks-based method, the DFT-NEURON method, was developed to improve the accuracy of first-principles calculations and was applied to correct the systematic deviations of the calculated heats of formation for small-to-medium-sized organic molecules (Hu, L. H.; Wang, X. J.; Wong, L. H.; Chen…
Far infrared spectra of 14 commonly used explosive samples have been measured by using Fourier Transform Infrared Spectroscopy (FTIR) and THz Time-Domain Spectroscopy (THz TDS). New absorption resonances between 20 cm<sup>-1</sup> and 650 cm<sup>-1</sup> are reported. Below 20 cm<sup>-1</sup>, no clear absorption reso…
The preparation and properties of [Mn(4)O(3)(O(2)CPh-R)(4)(dbm)(3)] (R = H, p-Me, p-OMe, and o-Cl; dbm(-) is the anion of dibenzoylmethane) single-molecule magnets (SMMs) with virtual C(S) symmetry are reported. They were prepared by controlled potential electrolysis in 26-80% yields. The structures comprise a distort…
We studied the mechanism of CO oxidation on O-covered Pt(111) surfaces during CO exposure by means of time-resolved near edge x-ray absorption fine structure spectroscopy. Two distinct reaction processes were found to occur sequentially; isolated O atoms and island-periphery O atoms contribute to each process. Combina…
Here, we present a strategy whereby a water-soluble tricycloquinazoline ( TCQ ) core is generated by hydrolysis of the corresponding nonionic hexaacetate, presenting itself as a potential (discotic) mesogen. The in situ generated core fragment was then used as a hexaanionic building block (or tecton) for assembly into…
The influence of gravity on a suspension of sterically stabilized colloidal gibbsite platelets is studied. An initially isotropic-nematic biphasic sample of such a suspension develops a columnar phase on the bottom on prolonged standing. This phenomenon is described using a simple osmotic compression model. We perform…
Thin polyimide layers have been patterned via a μ-rubbing process that can induce the homogeneous planar alignment or erase the previous alignment history of liquid crystals (LCs) that it comes into contact with. The Figure shows optical micrographs of two patterned polyimide substrates with LCs sandwiched between the…
The thermal conductivity of a Y-junction carbon nanotube with a (14,0) trunk splitting into two (7,0) branches has been investigated using a molecular dynamics approach. It has been found that the thermal conductivity of the Y-junction nanotube is less than that of a corresponding straight (14,0) nanotube, due to latt…
The ruthenium(II) porphyrin fluorophore complexes [Ru(TPP)(CO)(Ds-R)] (TPP = tetraphenylporphinato dianion; Ds = dansyl; R = imidazole (im), 1, or thiomorpholine (tm), 2) were synthesized and investigated for their ability to detect nitric oxide (NO) based on fluorescence. The X-ray crystal structures of 1 and 2 were…
The copper metalation into the hexaphyrins is accompanied by large structural changes to give four complexes exhibiting gable structures and varying antiferromagnetic couplings.
The temperature/pressure phase diagram for ${(\mathrm{TMTTF})}_{2}{\mathrm{SbF}}_{6}$ is determined using $^{13}\mathrm{C}$ NMR spectroscopy. At ambient pressure, a transition to a charge-ordered (CO) state occurs at ${T}_{\mathrm{CO}}=156\phantom{\rule{0.3em}{0ex}}\mathrm{K}$, and antiferromagnetic (AF) order is obse…
Tin dioxide nanoparticle suspensions were synthesized at room temperature by the hydrolysis reaction of tin chloride (II) dissolved in ethanol. The effect of the initial tin (II) ion concentration, in the ethanolic solution, on the mean particle size of the nanoparticles was studied. The Sn 2+ concentration was varied…
The first noncentrosymmetric potassium templated borogermanate, K(2)[Ge(B(4)O(9))].2H(2)O, has been solvothermally synthesized and characterized by IR, SEM, powder X-ray diffraction (PXRD), TGA, energy dispersive spectroscopy (EDS), single crystal X-ray diffraction, and second harmonic generation (SHG) activity, respe…
Hydrogen adsorption isotherms at 77, 87, and 298 K have been measured on three samples of single-wall carbon nanotubes. The highest adsorption capacity (1.58 wt % at 77 K, 1.15 wt % at 87 K, and 0.02 wt % at 298 K) at atmospheric pressure has been observed in a chemically activated sample (activated with KOH), which h…
The physical and chemical properties of bulk Ce(1-x)Tb(x)O(2) and Ce(1-x)Tb(x)O(y) nanoparticles (x<or =0.5) were investigated using synchrotron-based x-ray diffraction (XRD), x-ray adsorption near edge spectroscopy (XANES), Raman spectroscopy (RS), and first-principles density-functional (DF) calculations. DF results…
The glycomonomer methyl 6- O -methacryloyl-α- d -glucoside was prepared by lipase-catalyzed transesterification of vinyl methacrylate with methyl α- d -glucoside in dry acetonitrile. The desired 6- O regioisomer was obtained in good yield and its structure confirmed by 1 H− 1 H and 1 H− 13 C correlation NMR spectrosco…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTNew Trends in the Synthesis of π-Electron Donors for Molecular Conductors and SuperconductorsJun-ichi Yamada, Hiroki Akutsu, Hiroyuki Nishikawa, and Koichi KikuchiView Author Information Department of Material Science, Graduate School of Material Science, University of Hyogo…
Recycling size exclusion chromatography (RSEC) provides a high-resolution technique for the analysis and separation of materials based on size. We show here the application of this method to gold nanocrystals stabilized by thiols. Alternate recycling is more effective at separating nanomaterials as compared to closed-…
Particles of micrometer to nanometer size often aggregate to form branched structures. Such materials include metals and metal oxides as well as biological and polymeric materials (considering the persistence length as a primary unit). Characterization of such structures is difficult since they typically display disor…