Materials Literature
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Selective exposure to visible light is used to permanently trim the resonant wavelengths of coupled ring-resonator filters and delay-lines realized on a chalcogenide As2S3 platform. Post-fabrication manipulation of the circuit parameters has proved an effective tool to compensate for technological tolerances, targetin…
We present measurements of the electronic properties of graphene using a repositionable micro four-point probe system, which we show here to have unique advantages over measurements made on lithographically defined devices; namely speed, simplicity and lack of a need to pattern graphene. Measurements are performed in…
XeF 2 treatment of aluminum and alumina surfaces is known to produce hydrophilic surfaces. There is however poor knowledge of the chemical nature of these surfaces. Using infrared absorption and X-ray photoelectron spectroscopy, the formation of highly hydrophilic AlF 3 and AlO x F y surface layers is identified upon…
A previously overlooked step of carbon nanotube (CNT) growth, incorporating C atoms into the CNT wall through the CNT-catalyst interface, is studied by density functional theory calculations. A significant barrier for incorporating C atoms into the CNT wall (∼2 eV for most used catalysts, Fe, Co, and Ni) is revealed a…
The chemical enhancement effects in surface-enhanced Raman scattering of p-aminothiophenol (PATP, it is also called p-mercaptoaniline or p-aminobenzenthiol) adsorbed on coinage metal surfaces with single thiol end or trapped into metal-molecule-metal junctions with both thiol and amino groups have been studied by dens…
Macroscopic molecular recognition observations were realized using polyacrylamide-based gels modified with α-cyclodextrin (α-CD), β-cyclodextrin (β-CD), 1-naphthylmethyl (1Np), and 2-naphthylmethyl (2Np) moieties, which are denoted as αCD(x)-gel, βCD(x)-gel, 1Np(y)-gel, and 2Np(y)-gel, where x and y indicate the mol %…
The excited-state properties of unsubstituted ortho-phenylene oligomers have been studied using TD-DFT. Calculations of vertical transitions at the helical ground-state geometries are in good qualitative agreement with the experimental UV-vis spectra. In the excited state, the spring-like compounds compress; for the l…
Future applications of discotic liquid crystals (DLCs) in electronic devices depend on a marked improvement of their conductivity properties. We present a study of 2,3,6,7,10,11-hexakishexyloxytriphenylene (HAT6) and show how local conformation, structural defects, and thermal motions on the picosecond time scale stro…
The self-assembly and gelating ability of a set of N-alkyl-(R)-12-hydroxyoctadecylammonium chlorides (NCl-n, where n = 0-6, 18 is the length of the alkyl chain on nitrogen) are described. Several are found to be ambidextrous (gelating both water and a variety of organic liquids) and very efficient (needing less than c…
The evolution of optical properties of two types of core/multishell nanocrystals (NCs)–type A (CdSe/CdS/Zn 0.5 Cd 0.5 S/ZnS) and type B (CdSe/CdS/Zn x Cd 1– x S/ZnS)—with an increase of shell thickness from 3.5 to 15.5 monolayers (MLs) has been studied. When the shell thickness was 9.5 MLs and more, the stability woul…
MicroRNAs (miRNAs) are small non-coding RNAs that play numerous important roles in physiology and human diseases. During animal development, many miRNAs are expressed continuously from early embryos throughout adults, yet it is unclear whether these miRNAs are actually required at all the stages of development. Curren…
Abstract Four types of drug nanoparticles (NPs) based on amphiphilic hyperbranched block copolymers were developed for the delivery of the chemotherapeutic doxorubicin (DOX) to breast cancer cells. These carriers have their hydrophobic interior layer composed of the hyperbranched aliphatic polyester, Boltorn ® H30 or…
A novel photoactivated artificial muscle model unit is reported. Here we show that organic/inorganic hybrid nanosheets reversibly slide horizontally on a giant scale and the interlayer spaces in the layered hybrid structure shrink and expand vertically by photoirradiation. The sliding movement of the system on a giant…
The effects of alkaline treatment and a compatibilizing agent on the tensile properties of sugar palm fibre-reinforced high impact polystyrene (HIPS) composites were studied. Two concentrations of an alkali solution (4% and 6%) and two percentages of a compatibilizing agent (2% and 3%) were used in this study. The alk…
It has been widely recognized that the combination of carbon nanotubes (CNTs) and low molar mass thermotropic liquid crystals (tLCs) not only provides a useful way to align CNTs, but also dramatically enhances the tLC performance especially in the liquid crystal display technology. Such CNT-tLC nanocomposites have ign…
ADVERTISEMENT RETURN TO ISSUEGuest CommentaryNEXTControlling Graphene Properties Through ChemistryYury GogotsiView Author Information Department of Materials Science and Engineering and A.J. Drexel Nanotechnology Institute, Drexel University, Pennsylvania 19104, United States[email protected]Cite this: J. Phys. Chem.…
Learning from the stabilization of protein structures, we combine aromatic-aromatic and electrostatic interactions to tailor the elasticity of supramolecular hydrogels. Specifically, calcium ions allow interfiber cross-links among the supramolecular nanofibers of small peptides that consist of multiple carboxylic acid…
A Au/SiO 2 sample was prepared by ammonia-assisted grafting using HAuCl 4 as a gold precursor. Gold on the sample evacuated at 673 K is essentially in metallic form: adsorption of CO at 100 K results in formation of Au 0 –CO species (IR band at 2122 cm –1 shifting to 2103 cm –1 at high coverage). Coadsorption of CO an…
Introduction: Pittosporum phylliraeoides is an endemic Australian plant historically used as a medicinal agent by indigenous Australians. P. phylliraeoides solvent extracts were tested for antibacterial and antifungal activities and toxicity in vitro. Results: All extracts displayed antibacterial activity in the disc…
We show that the strong coupling of pseudospin orientation and charge carrier motion in bilayer graphene has a drastic effect on transport properties of ballistic p-n-p junctions. Electronic states with zero momentum parallel to the barrier are confined under it for one pseudospin orientation, whereas states with the…