Materials Literature
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Abstract Voltammetric and spectrophotometric measurements of poly(3,3″‐dipentoxy‐3′‐dicyanoethenyl‐2,2′:5′,2″‐terthiophene) (polyCN) films, in connection with other experimental evidence, reveal a normal oxidative, but a peculiar reductive behavior consisting of trapping of the negative charge during the cathodic scan…
Using an effective simplified continuum model for diblock copolymers, surfactants, and liquid crystals, the response of lamellar systems upon dilation and compression along the layer normal is investigated by large-scale parallelized dissipative particle dynamics like stabilized molecular dynamics simulation. We demon…
This paper presents the shear responses and interfacial rheology of photosensitive monolayers. Langmuir films of a fatty acid containing an azobenzene moiety that can undergo trans-cis photoisomerization have been investigated for their structural and dynamical properties. The cis conformation produces a structureless…
Supercritical CO 2 plasticization of semicrystalline poly(vinylidene fluoride) (PVDF) was investigated by measuring linear dilation as a function of temperature (75−130 °C) and pressure (138−670 bar) using a linear variable differential transformer (LVDT). The robustness of the LVDT technique allows the study of CO 2…
In this work we compare the relaxation properties of pure dehydrated glycerol with those of the glycerol usually studied (the glycerol sample which is not specially protected from water absorption). We show that the dielectric spectroscopy can distinguish between the different structures and dynamics of these two kind…
High-resolution electrical resistance R and $dR/dT$ measurements have been done in the (giant magnetocaloric) orthorhombic ${\mathrm{Gd}}_{5}({\mathrm{Si}}_{0.1}{\mathrm{Ge}}_{0.9}{)}_{4}$ compound to study their evolution through more than 50 thermal cycles between 300 K and 10 K. A detailed characterization of R and…
The Suzuki cross-coupling methodology provides a facile synthetic approach for the modular preparation of meso-tetraaryl cofacial bisporphyrins anchored by xanthene and dibenzofuran. This synthetic method furnishes cofacial bisporphyrin templates with enhanced steric and electronic protection from mu-oxo formation and…
We describe the synthesis, characterization, and lithographic performance of positive-working chemically amplified photosensitive polybenzoxazoles (PSPBOs) composed of partially tert -butoxycarbonyl (t-BOC) protected hyperbranched poly( o -hydroxyamide)s (HB-tbocPHAs) and diphenyliodonium 9,10-dimethoxyanthracene-2-su…
We report on the results of x-ray fluorescence measurements of ${\mathrm{CrO}}_{2}$ thin film, which show half-metallic electronic structure. The experimental finding that the elastically scattered radiation observed in Cr ${L}_{2,3}$ x-ray emission spectra is more prominent in ${\mathrm{CrO}}_{2}$ than in metallic Cr…
Fluorinated ansa substituted cyclophosphazenes endo-FcCH(2)P(S)(CH(2)O)(2)[P(F)N](2)(F(2)PN) [Fc = ferrocenyl] (1) and exo-FcCH(2)P(S)(CH(2)O)(2)[P(F)N](2)(F(2)PN) (2) readily transform to the spirocyclic compound [FcCH(2)P(S)(CH(2)O)(2)PN](F(2)PN)(2) (3) not only in the presence of CsF but also with non-fluorinated b…
Electrogenerated films of polyaniline were studied by potential steps in acetonitrile solutions to check for the presence of compaction, relaxation, and diffusion processes giving like-nucleation chronoamperograms such as those described by the electrochemically stimulated conformational relaxation (ESCR) model. This…
We present Monte Carlo simulations of discotic molecules using the Gay-Berne potential with shape $(\ensuremath{\kappa})$ and energy $({\ensuremath{\kappa}}^{\ensuremath{'}})$ anisotropies. Following the previous work of Bates and Luckhurst [J. Chem. Phys. 104, 6696 (1996)] at $\ensuremath{\kappa}=0.345,$ ${\ensuremat…
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…