Materials Literature
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Arrays of heterojunctions of Ag nanowires and amorphous carbon nanotubes have been synthesized. These heterojunctions have ohmic current–voltage characteristics based on the general characteristics of electronic structures of amorphous semiconductors and may provide a wide base for the design of various ohmic contacts…
A series of novel core−shell organic−inorganic hybrid materials having polyamidoamine (PAMAM) dendrimer cores and polyhedral oligosilsesquioxane (POSS) shells were prepared. Compositional variety of these hybrids was achieved by varying the dendrimer generation and POSS content. Structures were confirmed by 1 H, 13 C,…
A Comment on the Letter by L. Z. Ruan, J. R. Sambles, and I. W. Stewart, Phys. Rev. Lett. 91, 033901 (2003).Received 19 February 2004DOI:https://doi.org/10.1103/PhysRevLett.93.109401©2004 American Physical Society
Abstract An Erratum has been published for this article in J. Polym. Sci. Part A: Polym. Chem. (2004) 42(22) 5845 New multiblock copolymers derived from poly(L‐lactic acid) (PLLA) and poly(ε‐caprolactone) (PCL) were prepared with the coupling reaction between PLLA and PCL oligomers with NCO terminals. Fourier transfo…
The effects of Er3+ concentration in ZrO2 on the red (680 nm) and green (545 nm) upconversion emission from Er3+ under near infrared radiation (NIR) excitation (at both 1438 and 962 nm) are presented. For the highest Er3+ concentration used, the red band is almost quenched under VIS (489 nm) excitation, whereas it is…
The controlled synthesis of silver microcrystals with novel morphologies, such as solid or multiholed single crystalline disks, flowerlike aggregates consisting of platelike petals, and dendritic crystals consisting of wide leaves, was realized by using the polysaccharide dextran as a crystal growth modifier. The effe…
The preparation of switchable, high-resolution (360 dpi) electrochromic pictures in sealed transparent and reflective cells is described. Viologens were inkjet printed, chemically amplified, and crosslinked on mesoporous TiO2 thick-film electrodes (see Figure). As a counter electrode, e.g., optically transparent and e…
In order to prevent local chronic inflammation due to biomaterials such as implants, surface coatings that are able to modulate inflammatory response have been developed. It is shown that polyelectrolyte multilayers containing alpha-melanocyte-stimulating hormone (α-MSH) can be advantageously used for this purpose. Th…
The mechanism of mass transport and the related crystallization in poly(ethylene terephthalate) (PET) were studied. Solvent-induced crystallization can occur during the transport process in PET at low temperature. The important effect of changing the surrounding medium to solvent molecules is to reduce the glass trans…
Abstract Kinetic data on the esterification of palmitic acid with isopropanol were obtained using homogeneous ( para ‐toluene sulfonic acid, p ‐TSA) and heterogeneous (zinc ethanoate coated on silica gel, ZnA/SG) catalysts in a batch reactor. The ZnA/SG catalyst was prepared using a sol–gel technique. The esterificati…
The Figure illustrates methane densities adsorbed at 303 K and 3.5 MPa in pores of lanthanide-nitrate-dispersed, single-walled carbon nanohorns (SWNHs). For reference, bulk methane density and methane density adsorbed in pores of as-grown SWNH are also depicted. A small amount of lanthanide-nitrate dispersion (0.1 mmo…
A series of Co thin films have been evaporated onto Si(100) and glass substrates. The Co thickness, t Co , ranges from 50 to 195 nm. The structural and magnetic properties have been investigated by x-ray diffraction, hysteresis curves, Brillouin light scattering and magnetic force microscopy (MFM) techniques. The Co t…
A new model for the evolution of multivariant martensitic microstructure in single crystals and polycrystals is developed. In contrast with Landau-Ginzburg models, which are limited in practice to nanoscale specimens, this new scale-free model is valid for length scales greater than 100 nm and without an upper bound.…
Porous poly(divinylbenzene) (DVB) resins have been prepared using suspension polymerization with toluene and an oligomer as coporogens. The oligomers investigated were poly(propylene glycol) 1000 (PPG 1000), poly(propylene glycol) 4000 (PPG 4000), and poly(dimethylsiloxane) (PDMS). The porogen was used in a 1/1 vol/vo…
A general and well-controlled process used to fabricate uniform metal nanotube arrays via a multi-step template replication and electrodeposition approach is reported. Each nanotube is highly ordered, uniform in wall thickness and diameter along the entire tube (see Figure).
A novel, innocuous method which utilizes carbon dioxide to fabricate optically transparent nanocellular polymeric materials using a fluorinated block copolymer as the template is reported. The CO2-soluble fluorinated blocks effectively localize CO2 in the nanoscopic domains. At 0 °C, with slow depressurization, the bl…
The manganese(II) ion has many favorable properties that lead to its potential use as an MRI contrast agent: high spin number, long electronic relaxation time, labile water exchange. The present work describes the design, synthesis, and evaluation of a novel Mn(II) complex (MnL1) based on EDTA and also contains a moie…
We present a method to compute the electrooptic tensor from first principles, explicitly taking into account the electronic, ionic and piezoelectric contributions. It allows us to study the non-linear optic behavior of three ferroelectric ABO_3 compounds : LiNbO_3, BaTiO_3 and PbTiO_3. Our calculations reveal the domi…
We report a novel atom extraction mechanism from the native substrate by means of a scanning tunneling microscope tip-crash on a Ag(111) surface at 5 K. Individual atoms are scattered on the surface when a silver coated tip is dipped into the substrate at low tunneling biases. Quantitative analyses reveal that the mec…
A tough non-woven material of single-walled carbon nanotubes (SWNTs) with an area of up to several tens of square centimeters (see Figure) has been prepared by a direct-floating chemical vapor deposition method followed by purification. The SWNT non-woven material exhibits an extremely high Young's modulus of ca. 0.4–…