Materials Literature
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In ${\mathrm{Mn}}_{2}{\mathrm{Sb}}_{1\ensuremath{-}x}{\mathrm{Sn}}_{x}$ $(0<x<~0.4)$ compounds, a metamagnetic transition from antiferromagnetic to ferrimagnetic can be induced by an external field, with which a giant magnetoresistance (GMR) effect is associated. The largest GMR ratio of 60% for ${\mathrm{Mn}}_{…
I. Introduction 42 II. Carbons: Types, Classification, Precursors, and Preparation 45 A. Types of Carbon Solids 45 B. Precursors 77 C. Manufacture of Porous Carbons: A Molecular Perspective 81 III. Experimental Information 96 A. Diffraction Techniques 98 B. High-Resolution Transmission Electron Microscopy 108 C. Gas A…
A method to control the hydrophobicity and dielectric constant of mesoporous silica films for ultralow- k applications is described. Several surfactants have been used as sacrificial materials in (organo)silicate matrixes, prepared from tetraethoxysilane and methyltrimethoxysilane. To elucidate the relation between th…
We have carried out a thorough investigation of bonding and energetics in two different class of heteroatomic clusters viz. single impurity based LinSn (n⩽9) clusters and mixed aluminum-based binary clusters Al4X4 (X=Be, Mg, B, Si). We employ first principle Born–Oppenheimer molecular dynamics within the framework of…
Novel gold nanoparticles bearing cationic single-chain, double-chain, and cholesterol based amphiphilic units have been synthesized. These nanoparticles represent size-stable entities in which various cationic lipids have been immobilized through their thiol group onto the gold nanoparticle core. The resulting colloid…
Abstract In this work, we explore the high‐temperature phase stability of isolated, alumina‐coated zirconia nanocrystals with a goal of understanding how interfacial energy affects phase stability. Isolated tetragonal and hydrous amorphous zirconia colloids were synthesized and coated with alumina through the hydrolys…
The small-molecule glass former methyl tetrahydrofuran (MTHF) was investigated using dielectric spectroscopy, spin-lattice relaxometry, multidimensional stimulated-echo nuclear magnetic resonance techniques, and field gradient diffusometry. We show experimentally that MTHF nicely fits into the pattern of related small…
A theoretical study of the lithium intercalated Li x V 2 O 5 system has been performed using a dual approach, based on ab initio calculations and experimental data. Two main aspects have been investigated: the atomic structure of each phase and the voltage of a lithium battery with a positive electrode made of Li x V…
Hybrid clay-organic monolayers prepared using the Langmuir−Blodgett (LB) method are examined by polarized infrared attenuated total reflection spectroscopy (ATR), polarized grazing angle infrared reflection absorption spectroscopy (IRRAS), and atomic force microscopy (AFM). These spectra represent the first reported I…
A new series of SrCo 0.4 Fe 0.6 - x Zr x O 3 - δ (0 ≤ x ≤ 0.2) and SrCo 0.95 - x Fe x Zr 0.05 O 3 - δ (0.1 ≤ x ≤ 0.8) oxides were synthesized by the solid-state reaction method. The incorporation of Zr and its effect on the crystal chemistry, oxygen permeation, and structural stability of SrCo 0.4 Fe 0.6 - x Zr x O 3…
Fluctuation effects in symmetric diblock copolymer melts are quantitatively examined with the first direct comparison between Monte Carlo simulations and mean-field theory where both are performed on the same identical model. The simulations provide the most conclusive evidence to date that fluctuations transform the…
Fast-MAS 1 H NMR is used to probe the structure and dynamics of the adsorbed water and polymer components in polyelectrolyte multilayer (PEM) films and the bulk polyelectrolyte complex (PEC). The films, ranging in size from a single layer to 5 bilayers, consist of poly(diallyl dimethylammonium chloride), PDADMAC, and…
TiO 2 −SiO 2 binary oxides of low Ti content promoted photocatalytic epoxidation of propene by molecular oxygen. By catalytic runs and UV spectra, it was revealed that the isolated tetrahedral Ti species on the TiO 2 −SiO 2 samples are active for the photoepoxidation of propene, while the aggregated titanium oxide spe…
We describe laser-induced growth and deposition of gold and silver nanoparticles for use as surface-enhanced Raman scattering (SERS) substrates. The nanoparticles form at a glass surface in contact with an aqueous solution with metal ions and a reducing agent if the interface is illuminated with visible laser light. T…
Abstract Using thin films of a cholesteric mixture of acrylates 2 and 3 doped with the chiroptical molecular switch ( M )‐ trans ‐ 1 , photocontrol of the reflection color between red and green is possible. This doped liquid‐crystal (LC) film can be used for photoinduced writing, color reading, and photoinduced lockin…
Ga(1-x)In(x)N(y)As(1-y) is a promising material system for the fabrication of inexpensive "last-mile" optoelectronic components. However, details of its atomic arrangement and the relationship to observed optical properties is not fully known. Particularly, a blueshift of emission wavelength is observed after annealin…
A detailed theoretical study of carbon nanotube (NT) forest growth by chemical vapor deposition is given, including (i) ballistic mode of carbon species impingement into the NT surface, (ii) the carbon diffusion over NT surface and through the metal nanoparticle, and (iii) the temperature drop at the NT tip occurring…
Abstract Electrochemical polymerization in the strong Lewis acid, boron trifluoride ethylether (BFEE), has been used to prepare electrochromic polythiophene (PTh) and its derivatives: poly(3‐methylthiophene) (PMeTh), poly(3‐bromothiophene) (PBrTh), and poly(3,4‐dibromothiophene) (PDBrTh). The polymerization processes…
Effects of x-ray irradiation on the crystal structure and the electrical resistance were examined at low temperatures for the insulating phase of spinel compound CuIr2S4. We found that the resistance decreases by more than five decades by irradiation at 8.5 K. The structural change from triclinic to tetragonal was obs…
Extending to continuous potentials a cleaving wall molecular dynamics simulation method recently developed for the hard-sphere system [Phys. Rev. Lett. 85, 4751 (2000)], we calculate the crystal–melt interfacial free energies, γ, for a Lennard-Jones system as functions of both crystal orientation and temperature. At t…