Materials Literature
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Structural degradation of nanocrystalline ZnO films was observed with an increase in films thickness. Nanocrystalline epitaxial thin film with thickness of ∼170nm changed to polycrystalline ∼900nm with an increase in deposition time. Surface morphology revealed an average grain size of 30–50nm. Spatial correlation mod…
Abstract The self‐assembly of a metallo‐supramolecular PS‐[Ru]‐PEO block copolymer, where ‐[Ru]‐ is a bis ‐2,2′:6′,2″‐terpyridine‐ruthenium(II) complex, in thin films was investigated. Metallo‐supramolecular copolymers exhibit a different behavior as compared to their covalent counterparts. The presence of the charged…
Adaptive and amphiphilic poly(N,N-dimethylamino-2-ethyl methacrylate-graft-poly[epsilon-caprolactone]) co-networks (netP(DMAEMA-g-PCL)) were synthesized from a combination of controlled polymerization techniques. Firstly, PCL cross-linkers were produced by ring-opening polymerization (ROP) of epsilon-CL initiated by 1…
We report the effects of gate bias sweep rate on the electronic characteristics of ZnO nanowire field-effect transistors (FETs) under different environments. As the device was swept at slower gate bias sweep rates, the current decreased and threshold voltage shifted to a positive gate bias direction. These phenomena a…
Adsorbed or grafted polymers are often used to provide steric stabilization of colloidal particles. When the particle size approaches the nanoscale, the curvature of the particles becomes relevant. To investigate this effect for the case of cylindrical symmetry, I use a classical fluids density functional theory appli…
The magnetostatic interactions between carbon nanotubes filled with magnetic particles have been experimentally and theoretically studied. By making nanotubes uniformly magnetized, one eliminates the attraction caused by periodicity of nanoparticles in magnetic chains. The discreteness of individual nanoparticles in t…
Meisenheimer complexes are important intermediates in Nucleophilic Aromatic Substitution Reactions (S(N)Ar). They are formed by the addition of electron rich species to polynitro aromatic compounds or aromatic compounds with strong electron withdrawing groups. It is possible to distinguish two types of Meisenheimer or…
Novel photolabile protecting groups based on the 2-(2-nitrophenyl)propoxycarbonyl (NPPOC) group with a covalently linked thioxanthone as an intramolecular triplet sensitizer exhibit significantly enhanced light sensitivity under continuous illumination. Herein we present a detailed study of the photokinetics and photo…
Using lipids (N-acyl amino acids) and 3-aminopropyltriethoxysilane as structure- and co-structure-directing agents, mesoporous silicas with four different morphologies, that is, helical ribbon (HR), hollow sphere, circular disk, and helical hexagonal rod, were synthesized just by changing the synthesis temperature fro…
Abstract BACKGROUND: Microencapsulation technology promises new applications such as intelligent microstructures, phase change materials and self‐healing composites. Microcapsule synthesis and characterization have been researched extensively; however, the well‐known polymerization between epoxy resins and carboxylic…
Scratching the surface: Atomic force microscopy has been utilized to study the surface of zeolite L (see AFM image of the hexgonal face of a crystal). Correlations between nanometer high features and the structural units have been determined, with the smallest unit protruding from the surface corresponding to a single…
Abstract Alternating copolymers of glycolic (G) and lactic (L) acid were prepared by the condensation of the preformed dimers: L L G and L rac G. By size exclusion chromatography (THF, PS standards), poly(L L G) exhibited a molecular weight ( M n ) of 15.6 kg mol −1 , with a weight average molecular weight ( M w ) of…
The growth of wurtzite ZnO on cubic MgO (001) substrates by molecular beam epitaxy is reported. ZnO epilayers exhibit the nonpolar m-plane orientation based on x-ray diffraction and transmission electron microscopy analysis. Comparative studies of ZnO grown by pulsed laser deposition on MgO (001) result in preferred g…
The influence of carbon on the structural, magnetic, and magnetocaloric properties of LaFe11.2Co0.7Si1.1Cx compounds was investigated. The Curie temperature increases with increasing the carbon content. The maximum magnetic entropy changes under a magnetic field change of 5T are about 14.5, 9.8, and 8.3J∕kgK for x=0.1…
Relying on first-principles calculations within density functional theory and on an analytical model for the electronic structure, we present an overview of specific electronic and structural features of polar ultrathin films. MgO(111) unsupported films of finite thickness are chosen as a generic system, in order to e…
Two-dimensional electron gases in semiconductors have found use in applications such as optoelectronics, high-power radio-frequency and magnetoelectronic devices. The ability to grow heterostructures of oxides exhibiting similar effects is a significant step towards the fabrication of all-oxide devices. Here, we give…
We construct an efficient methodology for calculating wormlike chain statistics in arbitrary D dimensions over all chain rigidities, from fully rigid to completely flexible. The structure of our exact analytical solution for the end-to-end distribution function for a wormlike chain in arbitrary D dimensions in Fourier…
We discuss the crystallographic and chemical basis of the perovskite family (ABX(3)) of oxides that are used in different thin film applications. Starting with the original structure we extend our scope to several modifications. Basic parameters like the ionic radii, the tolerance factor, the occupation of the oxygen…
The electronic properties of the high spin mononuclear MnII complexes [Mn(tpa)(NCS)2] (1) (tpa=tris-2-picolylamine), [Mn(tBu3-terpy)2](PF6)2 (2) (tBu3-terpy=4,4',4''-tri-tert-butyl-2,2':6',2''-terpyridine) and [Mn(terpy)2](I)2 (3) (terpy=2,2':6',2''-terpyridine) with an N6 coordination sphere have been determined by m…
Thin film transistors (TFTs) of indium oxide (In2O3) and tin oxide (SnO2) were fabricated on SiO2 gate dielectric using reactive evaporation process. Structural investigation of the films revealed that In2O3 films were polycrystalline in nature with preferred (222) orientation and SnO2 films exhibited amorphous nature…