Materials Literature
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We describe the synthetic route to ethylenediaminetetraacetic acid (EDTA) derivatives that can be attached to surface-exposed thiol functional groups of cysteine residues in proteins, via a methylthiosulfonate moiety that is connected in a stereochemically unique way to the C-1 carbon atom of EDTA. Such compounds can…
Abstract The growth and importance of medical and related health care and hygiene textile sectors are attributed to the improvement and innovations in both textile technology and medical procedures. The aim of this study was to examine some of the structural properties of pure poly(vinyl alcohol) (PVA) and hydroxyprop…
We report on the temperature dependence of magnetization, electrical resistivity, and specific heat for the Heusler-type ${\mathrm{Fe}}_{2\ensuremath{-}x}{\mathrm{V}}_{1+x}\mathrm{Al}$ alloys with compositions $\ensuremath{-}0.01\ensuremath{\leqslant}x\ensuremath{\leqslant}0.08$. The resistivity for a slightly $\mathr…
Atomistic simulations, confirmed by electron microscopy, show that dislocations in aluminum can have compact or dissociated cores. The calculated minimum stress (sigma(P)) required to move an edge dislocation is approximately 20 times smaller for dissociated than for equivalent compact dislocations. This contradicts t…
Abstract The water absorption of hemp fiber/unsaturated polyester composites was determined by immersing the samples in water or by exposing them to air with a relative humidity of 94%. The water absorption increased with increasing fiber content. By using images obtained with a magnetic resonance imaging (MRI) system…
The reduction of silver ions in formamide is shown to take place spontaneously at room temperature without addition of any reductant. The growth of Ag particles was found to be dependent on Ag+ ion concentration. In the absence of any stabilizer, deposition of silver film on the glass walls of the container takes plac…
Pyrolysis of poly(norbornenyldecaborane) that has been electrostatically spun provides a route to non-woven mats of boron-carbide/carbon ceramic nanofibers with narrow distributions and controllable dimensions (see Figure). This approach allows the fabrication of composite ceramic fibers with varying composition, whic…
A simple process was developed to prepare fluorescent nanocrystal–polymer complexes with flexible processability. From these complexes one may facilely fabricate macroscopic fluorescent bulk in different shapes and fluorescent microspheres. The Figure is a photoluminescene image of the resultant composites.
Liquid-feed flame spray pyrolysis allows the synthesis of 20 nm diameter hexagonal Y3Al5O12 nanopowders (see Figure) that show no evidence of a yttrium aluminum garnet (YAG) phase. The nanopowders can be easily formed into green bodies that sinter to the YAG phase at nearly full density. This novel material offers pot…
ADVERTISEMENT RETURN TO ISSUEPREVCommunication to the...Communication to the EditorNEXTUse of Xyloglucan as a Molecular Anchor for the Elaboration of Polymers from Cellulose Surfaces: A General Route for the Design of BiocompositesQi Zhou, Lionel Greffe, Martin J. Baumann, Eva Malmström, Tuula T. Teeri, and Harry Brum…
A plant pathogenic fungus, Fusarium oxysporum, can be used as a biological model system for the extracellular bioleaching of hollow spherical silica nanoparticles (see Figure) from sand. The room-temperature synthesis of oxide nanomaterials using microorganisms starting from potential waste materials could lead to eco…
The spontaneous polarization (Ps) and spontaneous strains (xi) in mechanically unclamped and surface charge compensated PbTiO3 nanocrystals were determined as a function of particle size in the range <150nm by differential scanning calorimetry and x-ray powder diffraction, respectively. Significant deviations f…
Inclusion interaction of highly densely PEO grafted polymer brushes with α-cyclodextrins (α-CDs) has been investigated in this study. The polymers grafted with poly(poly(ethylene oxide) macromonomers) were prepared through the “grafting from” approach by atom transfer radical polymerization (ATRP) of poly(ethylene gly…
The structural organization of Bombyx mori silk fibroin was investigated by infrared (IR) spectroscopy. To this aim, (AG)15 and other model peptides of varying chain length, containing tyrosine (Y), valine (V), and serine (S) in the basic (AG)n sequence were synthesized by the solid phase method and their spectroscopi…
We use extreme shear to create a dispersion of nanoscale droplets of silicone oil in an immiscible water phase containing an anionic surfactant sodium dodecylsulfate. Using centrifugal size fractionation, we obtain nanoemulsions having a well-defined average radius of a=75 nm. We measure the structure of concentrated…
General syntheses have been developed for meso-substituted porphyrins with one or two substituents in the 5,10-positions and no beta substituents. 5-Substituted porphyrins with only one meso substituent are easily prepared by an acid-catalyzed condensation of dipyrromethane, pyrrole-2-carbaldehyde, and an appropriate…
Thermoreversible organogels were prepared from carbamates with alkyl side chains of different lengths. Gelation was possible only up to an alkyl side chain length of 12 carbons, beyond which crystallization occurs, due to the dominant van der Waals interaction between the alkyl chains. This is in contrast to other alk…
We report a large tunneling anisotropic magnetoresistance (TAMR) in (Ga,Mn)As lateral nanoconstrictions. Unlike previously reported tunneling magnetoresistance effects in nanocontacts, the TAMR does not require noncollinear magnetization on either side of the constriction. The nature of the effect is established by a…
The isotropic property of amorphous calcium carbonate (ACC) is useful for the controlled synthesis of calcium carbonate based biomaterials. A simple and efficient strategy for the synthesis of monodispersed microspheres of ACC is reported using a low-temperature precipitation of calcium carbonate in the presence of ma…
Abstract Many speciality organic chemical products, such as pharmaceuticals are crystals that exhibit multiple morphological forms and habits that are of critical importance not only to the end use properties of the products, but also to their downstream processing, such as in filtration and handling and in transport…