Materials Literature
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We observe ultrafast 1P-to-1S intraband relaxation in PbSe and CdSe nanocrystals (NCs) that have distinct energy spectra. While ultrafast dynamics in CdSe NCs has typically been interpreted in terms of electron-hole energy transfer, this mechanism is not active in PbSe NCs because of sparse densities of states in the…
Abstract A new and thorough examination of secondary electron (SE) yield as a function of primary energy ( E PE ) and atomic number Z for the 44 elements in the database is made. The principles of the semiempirical universal law for the SE yield are described and a template for Monte Carlo (MC) simulation is produced…
We employ ab initio molecular dynamics to simulate the response of hydrogenated amorphous silicon to light exposure (Staebler-Wronski effect). We obtain improved microscopic understanding of PV operation, compute the motion of H atoms, and modes of light-induced degradation of photovoltaics. We clarify existing models…
Spin wave equations in the non-equilibrium precessing state of a ferromagnetic system are found. They show a spin-wave instability towards growing domains of stable magnetization. Precession of the uniform magnetization mode is described by the Landau Lifshitz equation with the exponentially growing in time effective…
Structure and Dynamics of Disordered Matter Models of Disordered Structures General Concepts and Physical Properties of Disordered Matter Supercooled Liquids and the Glass Transition Mode Coupling Theory Further Models for Glassy Dynamics Dynamical Heterogeneities Gels Driven Systems.
The electron-transfer process from an H-terminated diamond (001) surface to an acidic water adlayer, leaving an induced p-type doping in the carbon layers, has been studied using first-principal density functional theory (DFT). The effect of various oxygen-containing species adsorbed to the surface (in the form of an…
Abstract Oriented dense thin films of LDHs may be grown on sulfonated polystyrene substrates with the (00l) direction of the LDH platelets perpendicular to the surface of the substrate.
Assembly of the type I procollagen molecule begins with interactions among the C-pro alpha1(I) and C-pro alpha2(I) domains. The C-propeptide domains themselves have subdomains of distinct structures. The important questions are where chain association begins and the basis of the chain selectivity which leads to the pr…
Abstract Ethylenediamine tetraacetic acid (EDTA) and 1,10-phenanthrorine (phen) were covalently attached to the 5′ and 3′ ends of two different oligonucleotides (ODNs), respectively. The sequences of the ODN conjugates were designed to contiguously hybridize on the target DNA with their auxiliary units facing each oth…
Amylose films blended with chitosan, which were free from additives such as acid, salt, and plasticizer, were prepared by casting mixtures of an aqueous solution of an enzymatically synthesized amylose and that of water-soluble chitin (44.1% deacetylated). The presence of a small amount of chitin (less than 10%) incre…
We demonstrate the use of molecular recognition to control the spatial distribution of guest molecules within block copolymer films. Block copolymers bearing recognition units were combined with complementary and noncomplementary molecules, and the extent of segregation of these molecules into the different domain typ…
Nanocomposite crystals, (Ag)(x)(Ag(2)S)(y) with x < y, are synthesized in micellar media. The generation of Ag clusters on Ag(2)S nanocrystals is attributed to the reduction of mobile Ag(+) ions in the Ag(2)S nanocrystals by sulfur derivatives. The proportions in the composite material can be modulated by electron bea…
We have correlated the Raman intensities of out-of-plane modes of nickel porphyrins with the nonplanar deformations of specific symmetries, i.e., static normal coordinate deformations (SNCDs) expressed in terms of irreducible representations of the unperturbed D(4h) point group. The model porphyrins Ni(II) octaethylte…
Two new chiral liquid crystals containing a well-known mesogenic cholesteryl group and an azobenzene moiety connected with a short flexible carbonyldioxy spacer and a polar carbonyl unit in a terminal chain were designed and synthesized. A sequence of very interesting mesophases were observed. Their reversible photore…
Organic−inorganic hybrids containing exfoliated nanosheets with a perovskite-related structure have been prepared from an n -decoxy derivative of an ion-exchangeable layered perovskite, HLaNb 2 O 7 · x H 2 O (HLaNb) or HCa 2 Nb 3 O 10 · x H 2 O (HCaNb), silanol-terminated poly(dimethylsiloxane) (PDMS), and tetramethox…
A computational search for low-energy crystal structures of 5-fluorocytosine was performed in conjunction with a manual crystallization screen to determine whether solid forms other than the known monohydrate structure could be discovered. The predicted low-energy structures were based on a hydrogen-bonded ribbon, whi…
Polyelectrolyte multilayer capsule reactors (PEMCRs) for the synthesis of two types of nanoparticles were prepared. The tunable PEMCRs containing two different functional groups that can be used to synthesize two types of nanoparticles simultaneously and to control the composition of two types of nanoparticles within…
This work emphasizes the important role of the synthetic parameters in the structure of the polymeric material obtained in the aniline polymerization. The polymers formed by the oxidative polymerization of aniline by copper(II) ions in acidic aqueous solution, acetonitrile/water medium, and also copper(II) acetate com…
We report on the synthesis, structural characterization, physical properties, and lasing action of two organic dyes, Rhodamine 6G (Rh6G) and Pyrromethene 597 (PM597), incorporated into new hybrid organic-inorganic materials, where the organic component was either poly(2-hydroxyethyl-methacrylate) (PHEMA) or copolymers…
Abstract Single-walled carbon nanotubes (SWNTs) were well dispersed in both water and organic solvent by the use of fullerodendron as a dispersant. A C60 moiety at the focal point of dendron plays a crucial role in the dispersing process, because dendron having an anthracene unit at the focal point can not disperse SW…