Materials Literature
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Generation 7 (G7) poly(amidoamine) (PAMAM) dendrimers with amine, acetamide, and carboxylate end groups were prepared to investigate polymer/cell membrane interactions in vitro. G7 PAMAM dendrimers were used in this study because higher-generation of dendrimers are more effective in permeabilization of cell plasma mem…
Abstract Polyamide 6 (PA6)/clay nanocomposites were prepared using a single screw extruder with an ultrasonic die attachment. The die pressure and ultrasonic power consumption were measured at various clay concentrations. The structure and morphology of nanocomposites studied by X‐ray diffraction (XRD) and transmissio…
We report here the synthesis of a series of new photoaddressable linear−dendritic diblock copolymers composed of poly(ethylene glycol) (PEG) and the first four generations of dendritic aliphatic polyesters based on 2,2-bis(hydroxymethyl)propionic acid (bis-MPA) functionalized at the periphery with mesogenic and photoc…
The success of synthetic vascular grafts is largely determined by their ability to promote vital endothelial cell functions such as adhesion, alignment, proliferation, and extracellular matrix (ECM) deposition. Developing such biomaterials requires the design and fabrication of materials that mimic select properties o…
A novel microcapsule system composed of sodium cellulose sulfate (NaCS) and chitosan was prepared by layer-by-layer (LbL) self-assembly technique. As a potential drug delivery system, it had several advantages in biocompatibility and biodegradation due to its use of natural polysaccharides. Some parameters in the prep…
Abstract We use Hedin's GW framework to compute quasiparticle bands for group‐II monoxides in wurtzite (wz) structure. Modern hybrid density functional theory is applied to compute the starting electronic structure for the solution of the quasiparticle equation. We derive band parameters and effective masses for the t…
Trivalent patchy colloidal particles are synthesized using a two-step mu-contact printing method. First, one pole of a particle is modified, then the other. With the center portion of the particle left intact, the final chemical makeup consists of three distinct patches of different chemical composition whose relative…
We present the results of the fast electro-optic response of multiwalled carbon nanotubes (MWCNTs)-doped deformed helix ferroelectric liquid crystal (DHFLC). The fastening of the response in MWCNTs-doped DHFLC has been attributed to the decrease in rotational viscosity and increase in anchoring energy. The decrease in…
We report here on the synthesis and passivation of small (20-30 nm) aluminum nanoparticles using alkyl-substituted epoxides as capping agents. FTIR and 13C NMR spectroscopy indicate that the epoxides polymerize to form a polyether cap on the surfaces of the aluminum nanoparticles. Nanoparticles capped with epoxyhexane…
Zipper examined: Elegant unzipping procedures result in the clean opening of multiwalled carbon nanotubes, leading to graphene nanoribbons (see scheme). Since graphene exhibits outstanding electronic properties, this method may be important in the development of modern nanoelectronic applications.
We intended to combine the liposomal preparation and the layer-by-layer deposition to prepare a nanosized capsule. Chitosan (CHI) was deposited to form the cationic polymeric layer onto a negatively charged liposomal surface and further deposition was carried out using anionic polymers dextran sulfate (DXS) or deoxyri…
The inability to grow large well-ordered ultra high vacuum (UHV) graphene with a specific number of layers on SiC(0001) is well known. The growth involves several competing processes (Si desorption, carbon diffusion, island nucleation, etc.) and because of the high temperatures, it has not been possible to identify th…
The protection of silver nanoprisms against etching by the epitaxial deposition of a thin layer of gold in solution has been investigated. It has been found that at low Au/Ag ratios (approximately 0.08 to 0.17) a thin layer of gold is deposited on the edges of the nanoprisms as expected, but without the structural dam…
Eine simple Eintopfmethode liefert mit Arylthiolen beschichtete Silber-Nanopartikel mit intensiven, breiten nicht-plasmonischen optischen Eigenschaften. Die Synthese gelingt mit mehreren Arylthiolliganden, einschließlich wasserlöslicher 4-Mercaptobenzoesäure. Die Nanopartikel zeigen eine lineare Absorption, die breite…
Phase change materials involve the rapid and reversible transition between nanoscale amorphous $(a\text{\ensuremath{-}})$ and crystalline $(c\text{\ensuremath{-}})$ spots in a polycrystalline film and play major roles in the multimedia world, including nonvolatile computer memory. The materials of choice are alloys of…
A carboxyethyl substituted azacrown ether derivative (CSAE) was intercalated as a second host into a parent host of well-crystallized crystal of Mg−Al layered double hydroxide (MgAl-LDH) by a CSAE/NO 3 − ion-exchange reaction. The influence of intercalation temperature on the structures and compositions of CSAE−LDH na…
Zinc peroxide (ZnO 2 ) hollow spheres of 100−200 nm diameter were synthesized by a simple hydrothermal method by using H 2 O 2 and ZnO powder as reagents without the assistance of any surfactant. O 2 bubbles in situ generated by the decomposition of H 2 O 2 served as a soft template in the formation of ZnO 2 spheres.…
The convergent synthesis, electrochemical characterization, and photophysical studies of phthalocyanine-fullerene hybrids 3-5 bearing an orthogonal geometry (Chart ) are reported. These donor-acceptor arrays have been assembled through metal coordination of linear fullerene mono- and bispyridyl ligands to ruthenium(II…
An accurate description of spatial variations in the energy levels of patterned semiconductor substrates on the micron and sub-micron scale as a function of local doping is an important technological challenge for the microelectronics industry. Spatially resolved surface analysis by photoelectron spectromicroscopy can…
The growth window of multiferroic ${\text{BiFeO}}_{3}$ thin films is very small. Both temperature and oxygen pressure will affect the film quality and phase purity significantly. We demonstrate here that even within the window where phase pure ${\text{BiFeO}}_{3}$ thin films can be obtained, different oxygen partial p…