Materials Literature
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The effect of uniaxial stress along the c axis on the metal–insulator transition of VO2 has been studied in the form of epitaxial thin films grown on TiO2 (001) and (110) substrates. A large reduction in the transition temperature TMI from 341 K for a single crystal to 300 K has been observed in the film on TiO2 (001)…
A long-standing limitation of first-principles calculations of substitutional alloy phase diagrams is the difficulty in accounting for lattice vibrations. A survey of the theoretical and experimental literature seeking to quantify the effect of lattice vibrations on phase stability indicates that they can be significa…
Phase separation and thermal crystallization of SiO/SiO2 superlattices results in ordered arranged silicon nanocrystals. The preparation method which is fully compatible with Si technologies enables independent control of particle size as well as of particle density and spatial position by using a constant stoichiomet…
Using density functional theory implemented within the generalized gradient approximation, a new non-magnetic insulating ground state of solid oxygen is proposed and found to be energetically favored at pressures corresponding to the $ε$-phase. The newly-predicted ground state is composed of linear herringbone-type ch…
Single crystalline films of bismuth-substituted ferrite garnets have been synthesized by the liquid phase epitaxy method where GGG substrates are dipped into the flux. The growth parameters are controlled to obtain films with in-plane magnetization and virtually no domain activity, which makes them excellently suited…
A theoretical model for magnetooptic imaging is presented. The model gives a detailed description of the magnetooptic indicator and the optical imaging system, where the intensity at the detector plane is described by a set of diffraction integrals. To demonstrate the applicability of the model, some issues concerning…
We investigate detection of magnetic data using magnetooptical indicators with in-plane magnetization. A simple model for the magnetooptical detection system is presented. We find that the signal to noise ratio changes strongly with the bit size, the polarization noise and the distance between the magnetic carrier and…
Formation of a solid solution of Cd 1 - y Mn y S nanocrystals is demonstrated using EXAFS (extended X-ray absorption fine structure).
We investigate the spinodal decomposition of a polymer mixture, at both critical and off-critical compositions, using atomic force microscopy. Phase separation in the bulk is imaged using tapping mode on the surface of microtomed samples. The generated surface profiles, revealed in height images, are analyzed accordin…
A novel approach for photochemical definition of distinct, basic color, emission areas in thin polymeric films is introduced. Two-color, blue and green, fluorescence imaging is demonstrated using an amino diphenylhexatriene derivative that upon protonation shows sizable shifts in both absorbance and fluorescence spect…
Anionic and cationic block copolymers containing different fractions and chain lengths of poly(ethylene glycol) (PEG) blocks were synthesized and characterized. Polyelectrolyte complex (PEC) formation between these copolymers and homopolyelectrolytes and the stability of these complexes in salt solutions were studied…
A light scattering turbidity method has been employed to measure the dimensionless colloidal osmotic compressibility of carefully characterized model athermal colloid (silica)−polymer (polystyrene) suspensions. Mixture thermodynamics is controlled by purely repulsive, hard sphere interactions between the particles whi…
Adsorption/desorption of water in the mesoporous material MCM-41 was observed with neutron diffraction. Results obtained with a H 2 O/D 2 O mixture contrast-matched to the host material unambiguously show that the pores are fully hydrated in the presence of excess water. During desorption carried out by air-drying a s…
[reaction: see text] An unsymmetrical analogue of 3,4-ethylenedioxythiophene (EDOT) has been synthesized by transetherification of 3,4-dimethoxythiophene. Electropolymerization leads to a stable electroactive polymer with electrochemical and electronic properties intermediate between those of the two symmetrical paren…
Self-assembled (SA) films of octadecyltrichlorosilane were patterned by exposure to X-rays in air through a mask to produce chemically patterned surfaces. The irradiated regions of the SA films underwent surface chemical modification from nonpolar, hydrophobic surfaces to polar, hydrophilic surfaces. The degree of che…
The degradation of polystyrene in various Lewis acids [aluminum chloride, ferric chloride, boron triflouride etherate, and tin(IV) chloride] at different temperatures (75−125 °C) has been studied in this work. The evolution of the molecular weight distribution (MWD) has been modeled using continuous distribution kinet…
ADVERTISEMENT RETURN TO ISSUECommunication to the...Communication to the EditorNEXTThin-Film Differential Scanning Calorimetry: A New Probe for Assignment of the Glass Transition of Ultrathin Polymer FilmsM. Yu. Efremov, J. T. Warren, E. A. Olson, M. Zhang, A. T. Kwan, and L. H. AllenView Author Information Material S…
Microporous manganese oxides have been prepared by nonaqueous sol−gel reactions involving tetrabutylammonium (TBA) or tetraethylammonium (TEA) permanganate and methanol in the presence of alkali cation dopants. Layered birnessite-type materials were obtained for Na + and K + dopants in a 0.5:1 reactant ratio with mang…
A new class of triarylpyridinio-derivatized [4'-(p-phenyl)(n)]terpyridyl ligands, R(1)(2)R(2)TP(+)-(p)(n)tpy, was designed as a novel category of electron-acceptor (A)-substituted proto-photosensitizing molecules. The first elements of this versatile family of ligands (i.e., n = 0, 1 and R(1) = R(2) = H), H(3)TP(+)-tp…
Monolayers of a predominantly hydrophobic poly(styrene)- b -poly(ethylene oxide) copolymer (7% PEO by mass) were transferred to a silicon substrate using the Langmuir−Blodgett method. The films were imaged using atomic force microscopy, and three types of features were observed in various proportions: dots (circular a…