Materials Literature
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Abstract Herein we report on the synthesis and properties of a new electron donor featuring an aromatic system to which four guanidino groups are attached, namely, 1,4,5,8‐tetrakis(tetramethylguanidino)naphthalene (ttmgn). The molecule is a double proton sponge with an asymmetric N–H ··· N bridge being formed in the p…
Abstract We have measured polarized Raman spectra of MnWO 4 single crystals at low temperatures, and studied the temperature dependence of the various phonon modes. From our Raman studies of the MnWO 4 , a new transition temperature, ∼180 K, was found. We have completely assigned the symmetries of the 18 observed Rama…
We synthesized a series of 1,4,7,10-tetraalkyltetracenes using a new 2,6-naphthodiyne precursor and 2,5-dialkylfurans as starting materials (alkyl=methyl to hexyl). Surprisingly, the solid-state color of the tetracenes ranges through yellow, orange, and red. Both yellow and red solids are obtained for the butyl deriva…
Nanoparticles (NPs) can offer many advantages over traditional drug design and delivery, as well as toward medical diagnostics. As with any medical device or pharmaceutical drug intended to be used for in vivo biomedical applications, NPs must be sterile. However, very little is known regarding the effect of steriliza…
The lanthanide binuclear helicate [Eu(2)(L(C2(CO(2)H)))(3)] is coupled to avidin to yield a luminescent bioconjugate EuB1 (Q = 9.3%, tau((5)D(0)) = 2.17 ms). MALDI/TOF mass spectrometry confirms the covalent binding of the Eu chelate and UV-visible spectroscopy allows one to determine a luminophore/protein ratio equal…
In this paper, we report the structural and compostional variation of Ce 2 Zr 2 O 7 pyrochlore under a controlled oxidation/reduction process. On oxidation Ce 2 Zr 2 O 7 transforms to Ce 2 Zr 2 O 8 via an intermediate lattice at Ce 2 Zr 2 O 7.5 . Crystal structures of the Ce 2 Zr 2 O 7, Ce 2 Zr 2 O 7.5, and Ce 2 Zr 2…
Crystalllization of silver ions to nanosized particles by cell filtrates from live and dead cell filtrates Aspergillus oryzae var. viridis ( A. oryzae var. viridis ) through bioreduction process was assessed. Strong plasmon resonance of silver nanoparticles was observed around 435 nm. Transmission electron microscopy…
The mechanism behind the steep slowing down of molecular motions upon approaching the glass transition remains a great puzzle. Most of the theories relate this mechanism to the cooperativity in molecular motion. In this work, we estimate the length scale of molecular cooperativity xi for many glass-forming systems fro…
Spider silk is an interesting biomaterial for medical applications. Recently, a method for production of recombinant spider silk protein (4RepCT) that forms macroscopic fibres in physiological solution was developed. Herein, 4RepCT and MersilkTM (control) fibres were implanted subcutaneously in rats for seven days, wi…
In this paper, we report on the synthesis of nanostructured rare earth oxides (Sm 2 O 3, Gd 2 O 3, Dy 2 O 3 ) via a facile benzyl alcohol based nonaqueous sol−gel process followed by calcination at moderate temperature. During the synthesis, rare earth acetylacetonates were used as the precursors. The resulting sample…
Abstract A novel approach to chemically functionalize multiwalled carbon nanotubes (MWCNTs) for making advanced polymeric nanocomposites with liquid crystalline polymers (LCPs) is presented. In this approach, two types of chemical moieties (i.e., carboxylic and hydroxyl benzoic acid groups) are selectively introduced…
Abstract The bonding and crystalline structures of oil‐fried fly ash collected from a power plant were analyzed by using Raman spectroscopy and X‐ray diffraction (XRD), respectively. These carbon powders underwent a series of annealing treatment for graphitization and crystallization. In Raman spectra, the refined, un…
The physics of heat conduction in layered, anisotropic crystals is probed by measurements of the cross-plane elastic constant ${C}_{33}$ and thermal conductivity $\ensuremath{\Lambda}$ of muscovite mica as a function of hydrostatic pressure. Picosecond interferometry and time-domain thermoreflectance provide high-prec…
Zeolite Y has a wide range of industrial applications as an ion exchanger, a sorption agent, a molecular sieve, and a catalyst due primarily to its excellent structural stability, large and accessible pore volume, high activity, high resistance to nitrogen compo unds, and high regenerability.1In particular, proton-exc…
Controlled deposition of graphene single layers is demonstrated by use of a Langmuir–Schaefer approach and oxidized graphene as a starting material (see image). The transferred films consist of a 90% single-layer graphene showing typical bipolar behavior and a mobility of 12 cm2 V−1 s−1 in the metallic regime. Very la…
We describe the facile synthesis of stable gold nanoparticle clusters densely functionalized with DNA (DNA-AuNP clusters) using dithiothreitol and monothiol DNA and their thermally reversible assembly properties. The size of the clusters exhibits a very narrow distribution and can be easily controlled by adjusting the…
The selective catalytic reduction of NO x with ammonia over an Fe−zeolite catalyst was investigated experimentally and a transient kinetic model was developed. The model includes reactions that describe ammonia storage and oxidation, NO oxidation, selective catalytic reduction (SCR) of NO and NO 2, formation of N 2 O,…
Air sensitive copper nanoparticles have been stabilized using a water soluble aminoclay matrix. The aminoclay shows remarkable permselective behaviour allowing only the ionic species to diffuse through it and react with copper nanoparticles. It blocks the neutral molecule oxygen, thereby stabilizing the copper nanopar…
A versatile sol−gel method for the synthesis of multimetallic layered double hydroxides (LDHs) is presented. The success of this method is due to the accurate control over crucial synthesis parameters, which are thoroughly analyzed, and to the complexation of metallic precursors in order to equalize their hydrolysis a…
Axons of the adult central nervous system exhibit an extremely limited ability to regenerate after spinal cord injury. Experimentally generated patterns of axon growth are typically disorganized and randomly oriented. Support of linear axonal growth into spinal cord lesion sites has been demonstrated using arrays of u…