Materials Literature
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Diamond films with grain sizes in the range of 5-1000 nm and grain boundaries containing nondiamond carbon are deposited on a silicon substrate by varying the deposition parameters. The overall morphologies of the as-deposited diamond-nondiamond composite films are examined by scanning electron microscopy and atomic f…
Three series of R 2 MoO 6:Eu (R = La, Gd, and Y) phosphor powders were synthesized by using the sol−gel method, and then the powder was annealed at a gradually decreased temperature from 1200 to 700 °C. The structures and spectra of the as-prepared phosphors were characterized by powder X-ray diffraction and photolumi…
Hydrotalcites of the general formula Me 6 Al 2 (OH) 16 Cl 2 ·4H 2 O (Me = Mg, Ni, Zn, Co, and Mn) and Ca 2 Al(OH) 6 Cl·2H 2 O were prepared by the coprecipitation method. X-ray diffraction, thermal analysis, Fourier-transform infrared spectroscopy, and Raman scattering were employed to study the structural features of…
Polymerization of dimethylacrylamide (DMAAm) cross-linked with PEG diacrylate was studied using 1 H NMR both in situ in a semifrozen system and in a supercooled aqueous system. The amount of nonfrozen microphase, in which polymerization proceeds, is defined by the concentration of the starting monomers and the freezin…
We describe morphological variations in binary mixtures of a poly(styrene- b -2-vinylpyridine) diblock copolymer (SP) ( M w = 151K) and poly(4-hydroxystyrene)s ( M w = 8K, 14K, 52K) (H8, H14, H52) as a function of molecular weight of homopolymer H and as a function of blend ratio. Transmission electron microscopy reve…
We investigate chemical functionalization of graphene by carboxyl (COOH) groups using first principles computational methods. The binding energies and equilibrium geometries of COOH groups covalently attached to graphene clusters with no surface defects, Stone−Wales defects, and vacancies are examined in the framework…
A tridentate ligand ((2-methylimidazol-4-yl)methylidene)histamine (abbreviated as H(2)L(2-Me)), that is, the 1:1 condensation product of 2-methyl-4-formylimidazole and histamine, was used for the syntheses of a new family of iron(II) spin-crossover (SCO) complexes with the general chemical formulas [Fe(H(2)L(2-Me))(2)…
Ligand exchange on [Au 25 (SCH 2 CH 2 Ph) 18 − ] [TOA + ] is studied with two chiral ligands R / S -BINAS and NILC/NIDC in THF with induction of metal-based optical activity. Under the applied condition the ligand exchange is only partial, showing that also within a mixed ligand shell significant optical activity can…
Kohlenstoff-Sandwich: Nach der Polymerisation eines pyrrolhaltigen Tensids zwischen zwei Siliciumoxidschichten (siehe Bild; Pyrrolringe in Rot) und anschließendem Carbonisieren und Entfernen der Siliciumoxidtemplate entstehen ausgedehnte Graphen-Monoschichten. Unter milden Bedingungen sind so μm-große, reine Graphen-S…
We report on the synthesis of brushes of bottle-brushes of poly(2-oxazoline)s on polished glassy carbon (GC) substrates. First, homogeneous and stable poly(2-isopropenyl-2-oxazoline) (PIPOx) brush layers with thicknesses up to 160 nm were created directly onto GC by the self-initiated photografting and photopolymeriza…
Polymers derived from monomers with a variety of functionalities provide materials with a vast range of properties and applications. Worldwide research has recently developed a wide number of methods suitable for the preparation of polymeric materials of nanometric dimensions, in view of the fact that, at the nanoscal…
The mechanisms of noncoherent photon upconversion that involve triplet-triplet annihilation (TTA) in solution have been investigated for two model systems. ZnTPP (meso-tetraphenylporphine zinc) is used as the model visible light-absorbing metalloporphyrin because its S(1) fluorescence intensity can be used to monitor…
An ionic liquid (IL), 1-ally-3-methylimidazolium chloride (AmimCl), was used as cosolvent for cellulose and soy protein isolate (SPI) to prepare different compositions of cellulose/SPI blend films, which were coagulated under a nonsolvent condition. The structures of the blend films were investigated by Fourier transf…
A new solvothermal method has been developed for the synthesis of monodisperse SmVO4 and CeVO4 nanocrystals with controlled size and shape. The obtained materials were characterized by X-ray photoelectron spectroscopy (XPS), X-ray diffraction (XRD), transmission electron microscopy (TEM), and selected area electron di…
Terthienobenzene (TTB, 6) was prepared through a new, high yield route along with pi-extended derivatives 10 and 11. Electropolymerization of tris-EDOT derivative 11 results in a highly stable cross-linked conjugated polymer that shows polaron confinement between the TTB units as confirmed by UV-vis-NIR spectroelectro…
Abstract In this investigation, poly(methyl methacrylate) (PMMA) and poly(vinylidene fluoride) (PVDF) blends (w/w) were prepared in a Brabender (South Hackensack, NJ) plasticorder with a thermoplastic mixing chamber (type W60) preheated at 180°C. These blends were further converted into films by a conventional solutio…
Wormlike micelles are assemblies of amphiphilic molecules of intermediate mean curvature between spherical micelles and flat bilayer membranes, which often form in solutions of peptide amphiphiles (hydrophilic peptide modules conjugated to hydrophobic subunits). In an effort to better understand the factors controllin…
Hybrid composites of polypropylene (PP) reinforced with short sisal and glass fibers were prepared using twin-screw extruder, followed by injection molding in the presence and absence of maleic anhydride grafted PP (MAPP) as a coupling agent. The mechanical properties such as tensile strength, flexural strength, and i…
Atom transfer radical polymerization (ATRP) was used to produce a versatile drug delivery system capable of encapsulating a range of molecules. Inverse miniemulsion ATRP permitted the synthesis of biocompatible and uniformly cross-linked poly(ethylene oxide)-based nanogels entrapping gold nanoparticles, bovine serum a…
We apply mesoporous thin silica films with nanometer-sized pores as drug carriers and incorporate the widely used anticancer drug Doxorubicin. Through single-molecule based measurements, we gain mechanistic insights into the drug diffusion inside the mesoporous film, which governs the drug-delivery at the target-site.…