Materials Literature
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Abstract Polypyrrole nanowires formed by polymerization of pyrrole on a DNA template self‐assemble into rope‐like structures. These ‘nanoropes’ may be quite smooth (diameters 5–30 nm) or may show frayed ends where individual strands are visible. A combination of electric force microscopy, conductive atomic force micro…
Protein stabilized, water soluble gold nanoparticles are essential for biomedicines and biotechnology. Bovine Serum Albumin (BSA) is one of the most abundant proteins. It has a remarkable ability of binding and transporting materials across cell membrane that makes it ideal for drug delivery and very useful for pharma…
Ordered nanostructures of meso-(4-cyanophenyl)-substituted Zn(II) porphyrin molecules are formed along step edges and specific directions of KBr(001). Short and long molecular wires, ringlike structures, and oriented multiwires (see image) are observed by high-resolution noncontact atomic force microscopy on insulatin…
Heating samples by microwave radiation is a particular example of the more general phenomenon where materials absorb energy from an external time-dependent field of an electric, magnetic, or mechanical nature. How this compares with conventional heating is a question of continued interest. Here, we show that the origi…
In the present study, we report a method for preparing a fluorescent thermosensitive hybrid material based on monodisperse, thermosensitive poly( N-isopropyl acrylamide) (PNIPAM) microgels covered with CdTe nanocrystals of 3.2 nm diameter. The CdTe nanocrystals were covalently immobilized on the surface of PNIPAM micr…
A light-controlled reversible binding switch based on photochromic 3H-naphtho[2,1-b]pyran is under development for studying cellular oscillatory calcium signals. The binding affinities of the closed and open forms of substituted naphthopyran 1 for Ca(2+), Mg(2+), and Sr(2+) in buffer were determined. The photochemical…
Graphene nanoribbons are formed from ultrathin electrospun poly(methyl methacrylate) (PMMA) nanofibers by electron beam irradiation. The number and width of the graphene sheets can be controlled precisely (see figure), providing a novel method of obtaining designed graphenes. This graphitization technique could be com…
The structural organization of sodium borophosphate glasses with composition (NaPO 3 ) 1− x (B 2 O 3 ) x (0.0 ≤ x ≤ 0.3) has been investigated by X-ray photoelectron spectroscopy (XPS), as well as single- and double-resonance 11 B and 31 P magic-angle spinning (MAS) nuclear magnetic resonance (NMR) spectroscopy. O-1s…
Nanosized silica and functionalized silica spherical particles have typically been made by complex methods, which were then used as template materials to fabricate nanostructured materials. However, in a simple one-step hydrolytic co-condensation process, we synthesized various sizes of nano/micro hard spheres of func…
The effect of surface trap states on band edge recombination in CdSe, CdS and CdS x Se 1− x alloy nanocrystals has been determined using fluorescence upconversion spectroscopy. These measurements reveal that there is both a size and composition dependence on the short-lived (τ 1 ) and long-lived (τ 2 ) components of f…
The present work reports the mobility of electronic charge carriers for well-defined TiO 2 . The mobility terms were determined by using the electrical conductivity for high-purity TiO 2, including both single-crystal and polycrystalline specimens. The concentrations of electronic charge carriers were derived from def…
We present a concept for reducing formation of fibrotic deposits by inhibiting self-assembly of collagen molecules into fibrils, a main component of fibrotic lesions. Employing monoclonal antibodies that bind to the telopeptide region of a collagen molecule, we found that blocking telopeptide-mediated collagen/collage…
Cobalt chains with lengths of up to 4−20 μm, self-assembled by flowerlike cobalt submicrospheres, have been synthesized at 200 °C for 4 h by a solvothermal method with the surfactant poly(vinyl pyrrolidone) (PVP). The average diameter of individual flowerlike submicrospheres is 700−900 nm, which are composed of compac…
The structure and morphology as well as the mechanism of formation of porous polyelectrolyte multilayers consisting of linear poly(ethylenimine) (LPEI) and poly(acrylic acid) (PAA) have been systematically investigated as a function of pH. The structures obtained exhibit dramatic differences with small changes in the…
A chiral optical negative-index metamaterial design of doubly periodic construction for the near-infrared spectrum is presented. The chirality is realized by incorporating sub-wavelength planar silver-aluminasilver resonators and arranging them in a left-handed helical (i.e., stair-step) configuration as a wave propag…
Transport in graphene nanoribbons with an energy gap in the spectrum is considered in the presence of random charged impurity centers. At low carrier density, we predict and establish that the system exhibits a density inhomogeneity driven two dimensional metal-insulator transition that is in the percolation universal…
Abstract Herein, we demonstrate an ammonia nitridation approach to synthesize self‐supported ordered mesoporous metal nitrides (CoN and CrN) from mesostructured metal oxide replicas (Co 3 O 4 and Cr 2 O 3 ), which were nanocastly prepared by using mesoporous silica SBA‐15 as a hard template. Two synthetic routes are a…
Biological production of silver nanoparticles by lixivium of sundried Cinnamomum camphora leaf in continuous-flow tubular microreactors was investigated. Properties of silver nanoparticles were examined by transmission electron microscopy (TEM), UV−vis spectroscopy, X-ray diffraction (XRD), and energy dispersive X-ray…
CVD Diamond can now be deposited either in the form of single crystal homoepitaxial layers, or as polycrystalline films with crystal sizes ranging from mm, μm or nm, and with a variety of growth rates up to 100s of μm h −1 depending upon deposition conditions. We previously developed a model which provides a coherent…
The development of a SERS substrate with high uniformity and sample-to-sample reproducibility is reported. Nanostructured poly(p-xylylene) films are prepared using an oblique-angle polymerization method, and SERS-active metals are deposited onto the nanostructured polymer by using thermal evaporation (see figure). The…