Materials Literature
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Straight curls: Conjugated polymers are aligned through the use of twining porphyrin oligomers (twimers), which act as helical “hosts” that twine around and are included within a single conjugated polymer. The resulting composites aggregate into relatively large 2D structures in the solid state and exhibit well-orient…
Pairing together planar material slabs with opposite signs for the real parts of their constitutive parameters has been shown to lead in the steady-state regime to interesting and unconventional properties that are not otherwise observable for single slabs, such as resonance, anomalous tunneling, transparency, and sub…
An automated crystal-mounting/alignment system has been developed at Lawrence Berkeley National Laboratory and has been installed on three of the protein-crystallography experimental stations at the Advanced Light Source (ALS); it is currently being implemented at synchrotron crystallography beamlines at CHESS, NSLS a…
A series of chromium-incorporated MSU-x mesoporous molecular sieves were synthesized under different templates, initial Si/Cr molar ratios, aging times, and temperatures in acid solution. The synthesis was performed by using sodium silicate, chromium nitrate, and nonionic poly(ethylene oxide) surfactant as the source…
The electrochemical impedance spectroscopy (EIS) technique was used for the study of the electrochemical behavior of an equiatomic NiTi alloy and an implant quality AISI 316 stainless steel type ASTM F138. Experiments were carried out using four different different test solutions: phosphate buffered saline (PBS), Dulb…
Abstract Summary: We used the dissipative particle dynamics method to simulate the self‐assembly of symmetric triblock copolymers of the type ABA. Depending on the volume fraction of the end blocks f A , several mesophases including lamellar, perforated lamellar, gyroid, hexagonal cylinders and bcc spherical micelles…
A new family of hexameric metallomacrocycles employing a functionalized bis(terpyridine) building block was prepared by both self-assembly and stepwise procedures capitalizing on terpyridine−metal(II)−terpyridine connectivity. Their structural composition was established by NMR, UV/vis, and mass techniques. Treatment…
Colloidal particles prepared by using the layer-by-layer technique are increasingly finding application in diagnostics, drug delivery, and sensing. Herein, we outline methods for applying three established techniques, confocal laser scanning microscopy (CLSM), flow cytometry, and differential interference contrast (DI…
The ACORN system was originally developed as a means of ab initio solution of protein structures when atomic resolution data were available. The first step is to obtain a starting set of phases, which must be at least slightly better than random. These may be calculated from a fragment of the structure, which can be a…
A homogeneous colossal magnetoresistance (CMR) effect at low temperatures has been found in a thin-film perovskite manganite Pr0.5Sr0.5MnO3. The transition is driven not by the spin alignment as in usual CMR in bulk samples but by the localization-delocalization transition switched by the change in the effective dimen…
A general approach is proposed for the synthesis of thermally stable and highly porous composite structures of metal oxide and silicate nanoparticles from aqueous solution of a metal salt and a suspension of Laponite clay. The formation of the mesoporous structure involves coupled processes: acid leaching of the Lapon…
We present here a facile route to the incorporation of gold nanoparticles (GNPs) with desired sizes into three-dimensionally ordered macroporous (3DOM) matrixes. Our route combined the first attachment of small GNPs to the silica colloidal crystal templates as precursors and their subsequent controlled growth by the i…
The aim of this work was to perform a systematic study about the effects induced by chitosan solution concentration and by chitin or glycerol incorporation on dense chitosan membranes with potential use as burn dressings. The membrane properties analyzed were total raw material cost, thickness, morphology, swelling ra…
Abstract Diblock star polymers were synthesized via atom transfer radical polymerization from a palladium porphyrin macroinitiator. The arms of the star polymers had an amphiphilic design, with the central Pd‐porphyrin surrounded by a relatively hydrophobic block of poly(butyl acrylate) and terminated by a hydrophilic…
An attractive target: Multiple porphyrin systems (see picture for example) are at the center of many synthetic efforts, and efficient strategies for preparing valuable building blocks for these polycycles are much sought after. Herein such a strategy for the synthesis of [1,2,3]triazolo[4,5-b]porphyrin building blocks…
Look through these films: The direct production of large-area SWCNT films with controlled thickness and, thus, transparency (see figure) is achieved via a simple chemical vapor deposition process. The resulting free-standing films show excellent turn-on fields for use in field-emission devices, they can be easily hand…
Gd(2)O(3):Eu(3+) nano-wire phosphors embedded in SBA-15 silica templates were synthesized using a combination of the sol-gel method and hydrothermal reactions followed by a sintering process at 1000 °C. The crystal structure of Gd(2)O(3):Eu(3+) was confirmed using x-ray diffraction. Observation using transmission elec…
Allyl chloride was epoxidized to epichlorohydrin with H 2 O 2 under solvent-free conditions in 94% selectivity using a new reversible supported catalyst, heteropolyphosphatotungstate/silanized silica gel. By the action of H 2 O 2 the heteropolyphosphatotungstate dissolves from the carrier surface and forms an active h…
Reactively evaporated TiO2 thin films were deposited on the glass substrate by electron beam heating technique. In the first stage evaporation rates are varied keeping substrate temperature fixed at 200 °C and oxygen flow rate at 9.0 sccm for all the samples. The deposition rates were varied from 0.12–0.20 nm/s with a…
It is difficult to judge objectively the amount and resolution limit of the anomalous signal present in diffraction data. While several criteria can be used for this purpose, the usefulness of these indicators varies and depends on factors such as the data redundancy, the accuracy of the estimation of intensities and…