Materials Literature
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We have observed concentration dependent exfoliation of single-walled carbon nanotubes dispersed in solutions of the synthetic peptide nano-1. As the nanotube concentration is reduced, the bundle diameters tend to decrease before saturating at <2.0 nm for concentrations below 6 x 10(-3) mg/mL. The fraction of individu…
α-Rhombohedral (α-rh) boron is the most stable polymorph of elemental boron at low temperatures and exhibits p-type semiconductive properties. Although α-rh boron has some voids of sufficient size in its structure, it does not accept alkali metals as donor dopants. An n-type or metallic α-rh boronlike material so far…
Abstract A novel efficient blue-green-emitting phosphor, LiBaPO4:Eu2+, was prepared by solid-state reaction method. Its excitation band is extending from 250 to 450 nm, which is adaptable to the emission band of near-ultraviolet (NUV) LED chips (350–420 nm). Upon 348-nm light excitation, the phosphor exhibits a strong…
We have investigated three-dimensional (3-D) architectures–microspheres and radial structures–based on biopolymer-assisted self-assembly from one-dimensional ZnO nanorods . The developed method is simple, rapid and cost-effective and can be used for self-assembly of different complex superstructures . A possible model…
Hydrated vanadium pentoxide (V 2 O 5 · n H 2 O) nanorod arrays with diameters of ∼200 nm and lengths of more than 5 μm have been synthesized via template-based physical wetting of V 2 O 5 sols. The V 2 O 5 · n H 2 O nanorod arrays were characterized by scanning electron microscopy, X-ray diffraction, and high-resoluti…
The solution structure and the aggregation behavior of stiff polymer−peptide nanofibers, self-assembled from well-defined poly(ethylene oxide)−peptide conjugates are described. Aqueous solutions at different concentrations of core−shell nanofibers were investigated by cryo-fixation transmission electron microscopy ( c…
Core-shell nanocapsules intended to be used as drug scavengers were prepared using a surfactant mixture containing octadecyltrimethoxysilane (OTMS) as a reactive amphiphile, to form spherical templates. A siloxane shell was grown on the surface of the templates by reacting tetramethoxysilane (TMOS) with the silanol gr…
Unlike octadecyl-tethering hemicyanine (HC-18), nonyl-tethering hemicyanine (HC-9) entered the hydrophobic channels of silicalite-1 with a very small preference to the inclusion with the alkyl part first. Accordingly, while the degree of uniform orientation (DUO) of HC-18 in the channels was 0.67, that of HC-9 was onl…
An efficient living ring-opening polymerization (ROP) of a permethoxylated epsilon-caprolactone [(OMe)CL] catalyzed by yttrium(III) isopropoxide was developed for the synthesis of degradable protein-resistant polymers [P(OMe)CL]. The lactone monomer was efficiently prepared from a reduced sugar, D-dulcitol. Kinetic st…
Dye-tagged metal nanoparticles are of significant interest in SERS-based sensitive detection applications. Coating these particles in glass results in an inert spectral tag that can be used in applications such as flow cytometry with significant multiplexing potential. Maximizing the SERS signal obtainable from these…
We combine experimental observations with ab initio calculations to study the reversible hydrogenation of single-wall carbon nanotubes using high boiling polyamines as hydrogenation reagents. Our calculations characterize the nature of the adsorption bond and identify preferential adsorption geometries at different co…
Functionalized gold nanoparticles have been prepared in an organic solvent by a two-phase reduction method in ethyl acetate and water using bis(6-hydroxyhexyl) disulfide bis(2-bromoisobutyl) ester, bis(6-acetyloxyhexyl) disulfide, and bis(5-carboxypentyl) disulfide bis(pentafluorophenyl) ester as stabilizing ligands.…
Crystal structures of quaternary Li−B−N−H phases were determined using NPD data on the isotopically labeled samples. These phases and the end members LiNH2 and LiBH4 all can be viewed as three-dimensional frameworks consisting of corner- and face-shared {Li[BH4−]n[NH2−]4-n} tetrahedra, n = 0–4, with a general chemical…
The surface of polyhydroxybutyrate (PHB) storage granules in bacteria is covered mainly by proteins referred to as phasins. The layer of phasins stabilizes the granules and prevents coalescence of separated granules in the cytoplasm and nonspecific binding of other proteins to the hydrophobic surfaces of the granules.…
The temperature dependence of the deviations from bulk behavior in ultrathin polymer films is demonstrated. The validity of a model aiming to rationalize the influence of interfacial interactions on the structural relaxation of polymers has been experimentally verified. The polymer layers at the very interface with th…
Because of conflicting reports and unrealistic literature values, a systematic study of the surface energy of chitin, chitosan, and their respective monomeric counterparts was carried out using contact angle measurements on films and pellets, before and after different purification procedures. All the commercial sampl…
A detailed study of the dynamical and structural aspects of the cold crystallization behavior of highly flexible poly(dimethylsiloxane)(PDMS) is presented. In order to understand the complete behavior, before, under and after crystallization, a wide range of experimental techniques have been employed. A particular emp…
Randomly deposited or partially aligned electrospun nylon-6 nanofibers were prepared by using a rotating collector with linear velocity from 0 to 900 m/min, and their molecular orientation was characterized with polarized Fourier-transform infrared (FT-IR) spectroscopy. At a linear velocity of 0 m/min, electrospun nyl…
ZnO nanotree arrays were successfully grown in large scale using a one-step facile method. Their branches and trunks display a special orientation relationship and the new interface structure is revealed. They exhibit significantly enhanced photocatalysis when compared to P25 and nonbranched micro/nanorods.
We report a new way of producing microcapsules consisting of a shell of aggregated colloids (also referred to as colloidosomes) using aqueous phase-separated polymer solutions (water-in-water emulsions) as a template. The extremely low interfacial tension of the template allows the production of reversible colloidosom…