Materials Literature
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A series of 1‘-substituted 6-nitro-3‘,3‘-dimethylspiro(2 H -1-benzopyran-2,2‘-indoline) compounds ( 3 − 8 ) of different functionality were synthesized, and the rate of thermal decay was measured in polar and nonpolar solvents and in two organogels. A significant retardation of the decay rate was observed for spiropyr…
To seek new potential materials for hydrogen storage, an arc-discharge method was employed to prepare nanosized nickel(or cobalt)/graphite composites, in which the nickel (or cobalt) particles were highly dispersed in a carbon matrix with particle size between 20 and 70 nm (or 5−20 nm). Quantitative TPD measurements s…
A simple laser ablation method has been employed for the synthesis of β-Ga 2 O 3 nanowires. The as-synthesized products were characterized by X-ray powder diffraction (XRD), transmission electron microscopy (TEM), and room-temperature photoluminescence. The synthesized β-Ga 2 O 3 nanowires have diameters of 15−50 nm a…
ADVERTISEMENT RETURN TO ISSUEPREVCommunication to the...Communication to the EditorNEXTSpectroscopic Characterization of a New Type of Conducting Polymer−Clay NanocompositeG. M. do Nascimento, V. R. L. Constantino, and M. L. A. TemperiniView Author Information Departamento de Química Fundamental, Instituto de Química,…
Three crystal forms of acetaminophen were prepared and characterized using a newly developed high-throughput crystallization platform, CrystalMax. The platform consists of design software, robotic sample dispensing and handling, and high-throughput microanalytics and is capable of running thousands of crystallizations…
High-surface-area materials of various different compositions can be synthesized by a route involving impregnation of activated carbons with concentrated metal salt solutions and subsequent calcination to burn off the carbon material. This route allows the synthesis of a wide variety of different metal oxides, either…
Block copolymer reduces particle size in immiscible polymer−polymer blends by suppressing droplet coalescence and by aiding droplet breakup through reduced interfacial tension. In this paper we separated coalescence from breakup and studied suppression of coalescence by block copolymers in a model blend composed of po…
Polylactide (PLA) is a biodegradable polyester formed by the ring-opening polymerization of lactide, the cyclic dimer of lactic acid. Many of the physical properties of PLA are influenced by the amount and distribution of the R and S stereocenters in the polymer chain. NMR spectroscopy is the most common technique use…
We report a method to measure the composite coloration efficiency of organic electrochromic polymers at 95% of the total optical density change measured at λ max . This practical method is useful for the comparison of organic polymers as well as inorganic electrochromic oxides and for gaining insights into the reasons…
A vertically aligned carbon nanotube (CNT) array is fabricated as a nanoelectrode platform for biosensor development. Prior to chemical functionalization, metal catalyst particles at the ends of CNT are removed and the closed ends are opened. We find that the oxidative treatment for generating the chemical functional…
D-Aminoacylases catalyze the hydrolysis of N-acyl-D-amino acids into D-amino acids with the aid of zinc ions. The first D-aminoacylase crystal from Alcaligenes faecalis has been obtained in hanging drops at pH 5.6 by the vapour-diffusion method using 30% polyethylene glycol 4000 as precipitant. It belongs to space gro…
The monophosphate tungsten bronzes $({\mathrm{PO}}_{2}{)}_{4}({\mathrm{WO}}_{3}{)}_{2m}$ form family of two-dimensional metals which exhibit charge density wave (CDW) instabilities. These materials are generally built by the regular stacking of $(a,b)$ layers in which chains made of segments of m ${\mathrm{WO}}_{6}$ o…
Crystals of porcine pancreatic elastase can be derived by soaking in high-molarity bromide solutions. These crystals, either in a glycerol-based cryoprotectant solution or in paraffin oil, can be subsequently pressurized under a xenon atmosphere to incorporate xenon. When paraffin oil is used, a larger number of bromi…
The 46 kDa xylanase from the Antarctic microorganism Pseudoalteromonas haloplanktis is an enzyme that efficiently catalyzes reactions at low temperatures. Here, the crystallization of both the native protein and the SeMet-substituted enzyme and data collection from both crystals using synchrotron radiation are describ…
The structure of the endoglucanase A from Clostridium thermocellum CelA was re-solved by three-wavelength MAD. Experimental phases were obtained in the resolution range 25-1.0 A. Various structure-solution approaches were tested in order to quantify the contribution of each wavelength. Two-wavelength MAD phasing was s…
The least path criterion or least path length in the context of redundant basis vector systems is discussed and a mathematical proof is presented of the uniqueness of indices obtained by applying the least path criterion. Though the method has greater generality, this paper concentrates on the two-dimensional decagona…
High-temperature investigations of the compound CsH(PO 3 H) (or CsH 2 PO 3, cesium hydrogen phosphite) revealed that this material undergoes a transition, with an onset of 137 °C, to a phase of high proton conductivity. The transition is accompanied by a large heat of transformation, Δ H = 58 ± 2 J/g (12.4 ± 0.4 kJ/mo…
Using deuteron nuclear magnetic resonance (NMR) and dynamic light scattering, we study the orientational order and dynamics of a BL038-5CB liquid-crystal mixture in a holographic polymer dispersed liquid-crystal material (HPDLC) as used for switchable diffractive optical elements. At high temperatures, where the liqui…
The static and dynamic structures of human lysozyme at seven different temperatures ranging from 113 to 178 K were investigated by normal-mode refinement of the cryogenic X-ray diffraction data collected from a single crystal. Normal-mode refinement decomposes the mean-square fluctuations of protein atoms from their a…
The overwhelming majority of tilted smectic liquid crystals exhibit synclinic (Sm-C) ordering (a uniform tilt direction in all smectic layers) rather than anticlinic (Sm-C(A)) ordering (a tilt direction that alternates from layer to layer). We propose that polar molecular-scale fluctuations of the interface between sm…