Materials Literature
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Structural, optical, and chemical properties of the WO x −ZrO 2 nanometric system were investigated using Raman spectroscopy, high-resolution transmission electron microscopy (HRTEM), and UV−visible diffuse reflectance. From diffuse reflectance spectroscopy, the absorption profile of the species in which WO x was pres…
Nanoscale shells of ZrO 2 were deposited onto size-selected, aerosolized Si nanoparticles by chemical vapor deposition (CVD). The CVD precursor was nitronium pentanitratozirconate (ZN, [NO 2 ][Zr(NO 3 ) 5 ]), which has been used previously to deposit ZrO 2 films on silicon wafers. Silicon nanocrystals were synthesized…
Absorption, light emission, and upconversion properties of Tm2+-doped CsCaI3 and RbCaI3 single crystals are presented and compared. Both compounds show multiple emissions after excitation at 21834 cm(-1) between 10 and 300 K. Besides sharp 4f-4f transitions around 8800 cm(-1), five and three broad 4f-5d emission bands…
Abstract Metastable VO2 nanorods, designated as VO2(B) with diameters of 80–250 nm were synthesized via a PEG-assisted hydrothermal approach. The samples were characterized by X-ray diffraction (XRD), field emission scanning electron microscopy (FESEM), and transmission electron microscopy (TEM) methods. The electroch…
A series of Schiff-based rod−coil molecules possessing thermotropic liquid-crystalline (LC) character have been prepared whereas a sugar-based moiety was introduced to the chain end of the molecules so as to create chiral amphiphiles for self-assembly. The self-assembly of the chiral Schiff-based rod−coil amphiphiles…
Abstract Summary: Two different types of biodegradable polyester composites, PLLA fiber‐reinforced PCL and PCL/PLLA blend films were prepared at PCL/PLLA ratio of 88/12 (w/w), together with pure PCL and PLLA films. Their enzymatic degradation was investigated by the use of Rhizopus arrhizus lipase and proteinase K as…
A group of new hyperbranched poly(aminoarylene)s ( hb -PAAs) were prepared by the copolycyclotrimerizations of diynes 1 − 3 and triyne 4 with monoynes 5 and 6 catalyzed by TaBr 5 and CpCo(CO) 2 − h ν. hb -PAAs with high molecular weights ( M w up to 26600) were obtained in high yields (up to 93%). Whereas the hb -PAAs…
The synthesis and crystal structure of a mixed valent manganite CaMn 3 O 6, equivalent to Ca 2/3 Mn 2 O 4, are reported, along with the magnetic properties. The structure was determined using electron diffraction and high-resolution transmission electron microscopy and refined from X-ray and neutron powder diffraction…
Electroless deposition of gold onto chemically functionalized carbon nanofibers leads to high-density nucleation of metal nanoparticles. These eventually form a highly textured coating, encapsulation the nanofibers. The gold-coated nanofibers show interfacial capacitances more than 10 times higher than those of the ba…
A novel organic−inorganic hybrid mesoporous iron oxophenyl phosphate has been synthesized by using supramolecular assembly of sodium dodecyl sulfate molecules. X-ray diffraction, transmission electron microscopic studies, and N 2 adsorption data indicated the wormhole-like disordered mesostructure in this sample. The…
Abstract Summary: Organic‐inorganic nanocomposite hybrid coatings were prepared through a dual‐cure process involving cationic photopolymerization of a hyperbranched epoxy functionalized resin and subsequent condensation of an alkoxysilane inorganic precursor. All the formulations investigated gave rise to photocured…
We report the entrapment of horseradish peroxidase and quantitative encapsulation of glucose oxidase within silica nanoparticles by utilizing an amine-terminated dendritic template. Our improved strategy employs a water-soluble biomimetic template which is able to catalyze the condensation of Si(OH)(4) to silica nanop…
Abstract Summary: In this work, silver nanoparticles were embedded in electrospun organic/inorganic composite nanofibers consisting of PAN and TiO 2 through photocatalytic reduction of the silver ions in silver nitrate solutions under UV irradiation. The morphology and diameter of PAN/TiO 2 composite nanofibers could…
The reaction of [ReIVCl4(ox)]2- and fully solvated Ni2+ ions in a MeCN/i-PrOH mixture affords the heterotetranuclear complex (NBu4)4[Ni{ReCl4(ox)}3] where the rhenium precursor acts as a bidentate ligand toward the nicke(II) ion through the oxalate group. The mixed 3d-5d species exhibits intramolecular ferromagnetic c…
We report results from a computational study of laterally tethered nanorod "shape amphiphiles". Our simulations predict that the model nanorods self-assemble into stepped-ribbon-like micelles, a centered rectangular stepped-ribbon phase, and two structurally different liquid crystalline bilayer phases: one in which th…
Recent studies have demonstrated that carbon, in the form of diamond, can be functionalized with molecular and/or biomolecular species to yield interfaces exhibiting extremely high stability and selectivity in binding to target biomolecules in solution. However, diamond and most other crystalline forms of carbon invol…
Photocrosslinked nanogels with a hydrophobic core and hydrophilic shell are successfully fabricated with the goal of obtaining a biocompatible and biodegradable drug carrier for hydrophobic anticancer drugs. These nanogels are composed of amphiphilic triblock copolymers, poly(D,L-lactic acid)/poly(ethylene glycol)/pol…
This report describes the fabrication and electroless plating of regular porous and pincushion-like polymer structures prepared by self-organization. Honeycomb-patterned films were prepared by simple casting of polymer solution under applied humid air and pincushion structures by peeling off the top layer of the forme…
We describe the design, construction, calibration, and operation of a relatively simple differential capacitive dilatometer suitable for measurements of thermal expansion and magnetostriction from 300 K to below 1 K with a low-temperature resolution of about 0.05 angstroms. The design is characterized by an open archi…
A first principles density functional based linear response theory (the so called Density Functional Perturbation theory \cite{dfpt}) has been combined separately with two recently developed formalism for a systematic study of the lattice dynamics in disordered binary alloys. The two formalisms are the Augmented space…