Materials Literature
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Heavy metal tungsten alloys have replaced lead and depleted uranium in many munitions applications, due to public perception of these elements as environmentally unsafe. Tungsten materials left in the environment may become bioaccessible as tungstate, which might lead to population exposure through water and soil cont…
In surfactant-induced, pseudomorphic transformations of submicrometer-sized nonporous spheres to mesoporous silica spheres, the surface morphologies of the products depend on the solvent used during the initial Stöber synthesis. After hydrothermal transformations employing cetyltrimethylammonium bromide (CTAB) as a su…
Dilatometry experiments on low- and high-density amorphous ices up to 0.30 GPa are presented together with powder x-ray diffraction data. Repeated isobaric heating and cooling cycles reveal three competing processes: irreversible (micro)structural relaxation, reversible relaxation, and (irreversible) crystallization.…
We present an inherently reproducible route to realizing high-performance SERS substrates by exploiting a high-throughput top-down/bottom-up fabrication scheme. The fabrication route employs self-assembly of amphiphilic copolymers to create high-resolution molds for nanoimprint lithography (NIL) spanning entire 100 mm…
Undulated carbon nanofiber arrays displaying a reflectance peak due to the periodic structure are prepared by thermolysis of a poly(furfuryl alcohol) precursor in a porous silicon photonic crystal template. The carbon/silicon composites act as optical sensors for organic vapors and are up to ten times more sensitive t…
The solubility equilibrium of clopidogrel hydrogen sulfate (Form I) was set up without the nucleation of Form II, as the nucleation rate of Form II is very slow under the low supersaturation. Using the laser monitoring technique, solubilities of clopidogrel hydrogen sulfate (Form I) in ethanol, 1-propanol, 1-butanol,…
A scalable synthesis of swallow-tailed quaterrylene diimides (STQDIs) and a method for the solution processing of sparingly soluble quaterrylene diimide (QDI) thin films are described. The pressure-assisted thermal cleavage of swallow tails yields crystalline QDI layers with electron mobility up to 0.088 cm(2) V(-1) s…
Fluorine-19 magnetic resonance methods offer advantages for molecular or cellular imaging in vivo due to the absence of radioactivity, lack of naturally occurring background signal, and the ability to easily combine measurements with anatomical MRI. Previous studies have shown that (19) F-MRI sensitivity is limited to…
Chloride to carbonate substitution in AFm phase of general formulae [Ca 2 Al(OH) 6 ]·[Cl 1− x ·(CO 3 ) x /2 ·(2+ x /2)H 2 O] (or 3CaO·Al 2 O 3 ·(CaCl 2 ) 1− x ·(CaCO 3 ) x ·(10+ x )H 2 O written in cement notation) has been characterized by studying 12 powdered samples synthesized at 25° and at 85°C. The existence of…
This study compares the synthesis and structure of poly(oleic diacid- co -glycerol) that results by using immobilized Candida antarctica Lipase B (Novozym 435, N435) and dibutyl tin oxide (DBTO) as catalysts. By using N435 catalysis and an oleic diacid to glycerol molar ratio of 1.0:1.0, the resulting polyester number…
Non-invasive ammonia sensors are attractive alternatives for the diagnoses of a variety of chronic diseases such as liver cirrhosis and renal failure. A low cost pentacene-based organic thin film transistor (OTFT) fabricated by a novel and simple process was demonstrated to be highly sensitive and specific for ammonia…
The vibrational properties of double-walled carbon nanotubes (DWNTs) is investigated by high-pressure resonance Raman scattering up to 30 GPa in two different pressure-transmitting media (PTM): paraffin oil and NaCl. The protection effect on the outer tube during compression is verified .The collapse of DWNTs is exper…
Graphene wires have been fabricated from large-area multilayer graphene sheets grown by chemical vapor deposition. As the methane concentration increases, a larger percentage of thicker graphene layers are grown. The multilayer graphene sheets have an average thickness of 10-20 nm with sheet resistances between 500 an…
The dynamical characteristics of ring and linear polyethylene (PE) molecules in the melt have been studied by employing atomistic molecular dynamics simulations for linear PEs with carbon atom numbers N up to 500 and rings with N up to 1500. The single-chain dynamic structure factors S ( q, t ) from entangled linear P…
A versatile solid-phase approach to sequence-defined polyamidoamines was developed. Four different Fmoc-polyamino acid building blocks were synthesized by selective protection of symmetrical oligoethylenimine precursors followed by introduction of a carboxylic acid handle using cyclic anhydrides and subsequent Fmoc-pr…
This study reports on the encapsulation efficiency of proteins in dextran sulfate/poly-L-arginine-based microcapsules, fabricated via layer-by-layer assembly (LbL). For this purpose, radiolabeled proteins are entrapped in CaCO(3) microparticles, followed by LbL coating of the CaCO(3) cores and subsequent dissolving of…
Thermoelectric properties of dense bulk polycrystalline ${\mathrm{In}}_{4}{\mathrm{Se}}_{3\ensuremath{-}x}$ ($x$ $=$ 0, 0.25, 0.5, 0.65, and 0.8) compounds are investigated. A peak dimensionless thermoelectric figure of merit ($\mathit{ZT}$) of about 1 is achieved for $x$ $=$ 0.65 and 0.8. The peak $\mathit{ZT}$ is ab…
Motivated by recent experimental data (Sepioni, M.; et al. Phys. Rev. Lett. 2010, 105, 207-205), we have studied the possibility of forming magnetic clusters with spin S > (1)/(2) on graphene by adsorption of hydrogen atoms or hydroxyl groups. Migration of hydrogen atoms and hydroxyl groups on the surface of graphene…
Alles muss raus: Die renale Clearance Glutathion-beschichteter lumineszierender Goldnanopartikel (GS-AuNPs) von 2 nm Größe war 10- bis 100-mal höher als die nichtlumineszierender AuNPs ähnlicher Größe mit einem Überzug aus Bis(p-sulfonatophenyl)phenylphosphan und Cystein. Die Ausscheidung der Partikel im Urin wurde Rö…
We report a first-principles study of structural and phase stability in three different structures of perovskite-types KMgH(3) according to H position. While electronic and optical properties were measured only for stable perovskite-type KMgH(3), our calculated structural parameters are found in good agreement with ex…