Materials Literature
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Using high resolution solid state (15)N and (2)H spectroscopy and longitudinal relaxometry we have studied the tautomerism of porphycene in the solid state, corresponding to a double proton transfer in two cooperative hydrogen bonds. The tautomerism is degenerate above 225 K but the degeneracy is lifted below this tem…
Cubic MgxZn1?xO thin films (x = 0.70) were grown on quartz substrates by radio frequency magnetron sputtering and a metal?semiconductor?metal structured photodetector was fabricated based on the film. The photodetector exhibited a dominant response peak at about 225?nm with a cutoff wavelength at about 230?nm, which l…
We derive an analytical expression showing that the fragility of a supercooled liquid is a result of (i) a thermodynamic term depending on change in configurational entropy and (ii) a kinetic term depending on change in the nonexponentiality or "stretching" of the relaxation function, as quantified by the exponent bet…
The mechanical behavior of segmented block copolymers is studied by unraveling the deformation mechanisms on both a macroscopic and a molecular level. Small-angle X-ray scattering and infrared dichroism are used to study the deformation of a thermoplastic elastomer with bisureidobutylene hard segments (PCLU4U) contain…
The effects of the incorporation of group-III (B and Al), group-IV (C and Ge), and group-V (N and P) impurities on the formation energies, electronic density of states, optical absorption spectra, and radiative lifetimes of Si nanocrystallites of different shape and with diameters up to 2 nm are studied by means of an…
Magnetoliposomes consist of vesicles composed of a phospholipid membrane encapsulating magnetic nanoparticles. These systems have several important applications, such as in MRI contrast agents, drug and gene carriers, and cancer treatment devices. For all of these applications, controlling the number of encapsulated m…
N-type ZnO/SiOx/n-type crystalline silicon isotype heterojunctions (HJs) have been prepared by magnetron sputtering. Native and thermal oxides were employed as the interlayer between the Si substrate and the ZnO film. Transmission electron microscopy and x-ray photoelectron spectroscopy revealed that an oxide layer wa…
We perform computational modeling studies to explore the properties of functionalized Mg−Al layered double hydroxides (LDHs). Using molecular dynamics (MD) simulations we study the intercalation of C 8 H 17 SO 3 − sulfonate into a Mg:Al 2:1 LDH system for which the experimental data have recently been reported ( J. Ph…
Very large scale patterned single-walled carbon nanotube (SWNT) networks were fabricated using a newly developed template guided fluidic assembly process. A mechanism for SWNT assembly and their control is described here. To maximize the directed assembly efficiency of SWNTs toward a wafer level SWNT deposition, Si or…
The intercalation process of acid-treated montmorillonite clays by a cationinc surfactant (decyltrimethylammonuium) from a hydroxide solution was affected by the temperature of acid activation. Although the cation exchange capacity of the treated clay at 90 degrees C (0.74 mequiv g(-1)) was lower compared to that trea…
The preparation of a novel carbohydrate lactone is reported, in excellent yield, from d-gluconolactone; ring-opening polymerization of the lactone yields a functionalized cyclic aliphatic polyester.
Finding lead-free ceramics with good piezoelectric properties is nowadays one of the most important challenges in materials science. The (K, Na, Li)(Nb, Ta, Sb)O 3 system is one of the most promising candidates as a lead-free ceramic for transducer applications and is currently the object of important research work. I…
It takes a lot of trouble to measure and calibrate the sensitivity of ultra-high-frequency couplers which are set in various gas-insulated switchgears (GIS). This paper is related to the approach of calculating the attenuation of the electromagnetic (EM) wave due to the partial discharge propagating through insulators…
A new improved pulsed spray pyrolysis technique (PSPT) was employed to deposit a vanadium oxide (V 2 O 5 ) thin film from a methanolic vanadium chloride precursor onto glass and conducting F : SnO 2 coated glass substrates.The structural, morphological, electrical, optical and spectroscopic properties of the film depo…
Azobenzene derivatives modified with dithiolato-bipyridine platinum(II) complexes were synthesized, revealing their highly extended photoresponses to the long wavelength region as well as unique photocontrollable tristability. The absorptions of trans-1 and trans-2 with one azobenzene group on the dithiolene and bipyr…
We describe a new type of optically controlled liquid crystal alignment layer that demonstrates unprecedented performance. It consists of an aminoazobenzene-type material with a very simple molecular structure, which is derived from methyl red by a one-step synthesis. We have devised a method of forming covalently att…
This article describes the linking propensity of the sulfite encapsulated polyoxovanadate (POV) anion, [As(8)V(14)O(42)(SO(3))](6-), with aqua-lanthanide complex cations [Ln(H(2)O)(6)](3+) in a controlled wet synthesis resulting in a series of organic free metal-oxide-based materials [{Ln(H(2)O)(6)}(2)As(8)V(14)O(42)(…
A facile, scalable, and low-cost gas-treatment method for selectively etching semiconductor single-walled carbon nanotubes (SWNTs) is developed. Using SO3 gas as the etchant at a temperature of 400 °C, semiconductor SWNTs can be selectively and efficiently removed, and after this gas treatment samples enriched with me…
Poly[(D,L-lactide)-co-glycolide] nanoparticles coated with polyethyleneimine on their surface were prepared by an emulsification-solvent evaporation method and subsequently surface modified by LBL assembly. The assembly of poly(acrylic acid) and polyethyleneimine on a planar substrate and on the PLGA nanoparticles was…
Gallium-67 labeled superparamagnetic iron oxide nanoparticles ([ 67 Ga]-SPION were prepared and evaluated for their altered biodistribution in normal rats. Superparamagnetic iron oxide nanoparticles (SPION) with narrow size distribution were synthesized by a co-precipitation technique using ferrous salts at Fe 3+ /Fe…