Materials Literature
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The effects of epoxy resin addition to a standard acrylate-based holographic polymer dispersed liquid-crystal mixture are investigated. Different resin concentrations are used and we show how the presence of the resin results in transmission gratings characterized by negligible scattering, polarization independent beh…
The electro-optic behaviour of polymer-stabilized polar smectic liquid crystals is studied in detail before and after photo-polymerization of a bifunctional monomer in the fluid SmA* and SmC* phases. We investigate the effect of a stabilizing, phase-separated polymer network on the electro-optic performance of smectic…
We report on recent progress in the production and the deposition on surfaces of dielectric materials of self-assembled metallic nanoparticle systems able to organize into branched networks. We emphasize the interest of these new objects for tailoring novel near-field optical properties that could be the basis for opt…
Electronic structures of faulted nanosystems are of particular technological relevance because realistic large scale synthesis of nanostructures inevitably leads to defects of one form or the other. In this work, we determine the atomic and electronic structures of carbon nanotubes (CNTs) with two of the major types o…
Time-resolved measurements of the magnetization reversal in single crystals of ${\mathrm{Mn}}_{12}\mathrm{Ac}$ in pulsed magnetic fields, at magnetic field sweep rates from $1.5\text{ }\text{ }\mathrm{kT}/\mathrm{s}$ up to $7\text{ }\text{ }\mathrm{kT}/\mathrm{s}$, suggest a new process that cannot be scaled onto a de…
A compliant terpolymer made of hexylmethacrylate (HMA), methylmethacrylate (MMA), and methacrylic acid (MAA) intended for use in small diameter vascular graft applications has been developed. The mechanical properties and in vitro biostability of this terpolymer have been previously characterized. The goal of this inv…
Porous silicon layers were prepared by electrochemical etching of p-type single-crystal Si (c-Si) of varying dopant concentration resulting in gradually changing morphology and nanocrystal (wall) sizes in the range of 2–25nm. We used the model dielectric function (MDF) of Adachi to characterize these porous silicon th…
Alpha-amino-epsilon-caprolactam (ACL) racemase (ACLR) from Achromobacter obae catalyzes the interconversion of l- and d-ACL. ACLR belongs to the fold-type I group of pyridoxal 5'-phosphate (PLP) dependent enzymes. In this study, the first crystal structures of a fold-type I racemase are solved for the native form and…
Magnetic and magnetocaloric properties of the intermetallic compound TbAgAl have been investigated. Temperature dependence of magnetization data revealed that TbAgAl exhibits magnetic ordering at 59 K and possesses competing ferromagnetic-antiferromagnetic interactions, which leads to the formation of Griffiths-like p…
Vertically aligned carbon nanotube turfs (VACNTs), consisting of entwined, nominally vertical carbon nanotubes, are being proposed for use as electrical and thermal contact materials. Issues in their implementation include high contact resistance, the van der Waals interactions of carbon nanotubes, and a low temperatu…
Close-packed nanoparticle monolayer films have been assembled at the water/toluene interface, and they can be transferred onto various hydrophilic solid substrates. The method involves adding alcohol and then toluene (when the dispersant is itself alcohol, only toluene was added) into a hydrophilic nanoparticle disper…
Novel molecular ecological techniques were used to study changes in microbial community structure and population during degradation of polylactide (PLA)/organically modified layered silicates (OMLS) nanocomposites. Cloned gene sequences belonging to members of the phyla Actinobacteria and Ascomycota comprized the most…
Two substrates were coated with a mixture containing two polyamic acids. One of the polyamic acids has an alkyl side chain and ordinarily is used for vertical liquid crystal alignment. The other polyamic acid does not have a side chain and ordinarily is used for planar liquid crystal alignment. The substrates were bak…
The effect of annealing on the miscibility and phase behavior of Sorona {poly(trimethylene terephthalate), PTT} and bisphenol A polycarbonate (PC) blends was examined. These blends exhibited heterogeneous phase-separated morphology and two well-spaced glass transition temperatures (Tgs) indicating immiscibility. The S…
The purpose of this study was to prepare and characterize a three-dimensional scaffold consisting of porous nonwoven silk fibroin net/nano-apatite composite. The silk fibroin net was mineralized with apatite by alternative soaking in calcium and phosphate solutions. The scaffold exhibited a porous microstructure with…
Protein-resistant polyurethane (PU) surfaces were prepared by surface-initiated simultaneous normal and reverse atom transfer radical polymerization (s-ATRP) of poly(oligo(ethylene glycol) methacrylate) (poly (OEGMA)). Oxygen plasma treatment was employed for initial activation of the PU surface. The grafted polymer c…
Single-crystalline Y(OH) 3 nanowires were synthesized from Y 2 O 3 powder by a simple acetic acid assisted hydrothermal method under near neutral conditions. The nanowires show unusual, bundle-like morphology with diameter of 20−50 nm and aspect ratio of 600−2000. It is found that the presence of acetic acid and its c…
Abstract Längere Schaltwellenlängen und gute photochemische Ausbeuten und Stabilitäten des cis ‐Isomers in reduzierenden wässrigen Umgebungen kennzeichnen 4,4′‐Diamido‐substituierte Azobenzole mit 2,2′‐Aminoalkyl‐Substituenten. Die Produkte eignen sich zur Photosteuerung biomolekularer Strukturen in zellulären Umgebun…
Gold nanoclusters stabilized by poly(N-vinyl-2-pyrrolidone) (Au:PVP) promote the oxidation of benzylic ketones, including auto-oxidation-type bond-cleavage reactions and α-hydroxylation, under ambient conditions. The catalyst accelerates the formation of an α-peroxide intermediate, from which bond cleavage spontaneous…
An industrial cylinder Ni-based catalyst, LaNiO x /ZSM-5 (ϕ = 3 mm), was prepared by a sol−gel method, and its catalytic performance was investigated for CH 4 /CO 2 reforming reaction not only in laboratory scale but also in pilot plant scale. The result revealed that the conversion of CH 4 and CO 2 was 97% and 94%, r…