Materials Literature
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ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTSurface-enhanced Raman spectroscopyRobin L. GarrellCite this: Anal. Chem. 1989, 61, 6, 401A–411APublication Date (Print):March 15, 1989Publication History Published online22 September 2008Published inissue 15 March 1989https://pubs.acs.org/doi/10.1021/ac00181a001https://doi.…
The relationship between geometry and physical properties of aperiodic structures is investigated by considering the example of the tight-binding Schr\"odinger equation in one dimension, where the site potentials are given by an arbitrary deterministic aperiodic sequence. In a perturbative analysis of the integrated d…
We report exact results for two and three dimensional directed models of polymer chain adsorption–desorption transition in the presence of attracting substrate. A number of properties of this transition are evaluated explicitly. These include the phase diagram, the adsorption fraction and the monomer-density profile.…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTSURFACE-ENHANCED RAMAN SPECTROSCOPYCite this: Anal. Chem. 1989, 61, 6, 401A–411APublication Date (Print):March 15, 1989Publication History Published online30 May 2012Published inissue 15 March 1989https://doi.org/10.1021/ac00181a715RIGHTS & PERMISSIONSArticle Views327Altmetr…
Substantial changes in the radial distribution function of amorphous Si films have been observed in neutron-diffraction studies. The spectra indicate changes in short-range order associated with an \ensuremath{\sim}11% modification in the bond-angle distribution width. The results allow the first direct comparison of…
Tin-doped indium oxide (ITO) films have been deposited by RF sputtering an oxide target onto substrates held at different distances from the target surface. The deposition rate is constant up to a target-to-substrate distance of 3.5 cm and decreases with further increase in substrate distance, this distance being asso…
ABSTRACT A series of tests to describe the effect of numerous holes in casing on the mechanical crush resistance has been run in casing and in L-80 steel tube models. The tests were run with big holes and normal hole sizes for perforations in phasings of 0°, 180°, 120°, 90°, and 60°. Shot density was varied in the mod…
Very regularly coiled spring-like fibers of Si3N4 have been obtained from a gas mixture of Si2Cl6, NH3, and H2 at 1200 °C on a graphite substrate on which an iron impurity was painted. The spring-like fibers were amorphous Si3N4 with a circular cross section having a 0.5–1 μm thickness, 3–5 μm coil pitch, 10–15 μm coi…
A high-resolution neutron scattering study of ${\mathrm{Ni}}_{62.5}$${\mathrm{Al}}_{37.5}$ shows that the martensitic transformation is associated with a homogeneous distortion and a nearly seven-fold modulation of the cubic lattice which is predicted by an observed phonon anomaly above ${T}_{M}$. In the low-temperatu…
The resonance-enchanced multiphoton ionization (REMPI) technique was employed for detection of gas phase atomic hydrogen in the filament-asisted diamond growth environment. The H atom REMPI signal varied significantly with the reactant CH4/H2 fraction as well as with the filament temperature. We interpret these observ…
The magnetic field (H) dependences of the ultrasonic attenuation Δα(H) and the relative velocity ΔV(H) responses of 0.6 GHz Rayleigh-mode surface acoustic wave pulses in vacuum-evaporated, uniaxially anisotropic nickel thin films were measured and correlated with changes in the sample’s dc magnetoresistance Δρ(H). Rec…
In this Letter we study the evolution of a two-dimensional soap froth. We present experimental evidence for the existence of a limiting scale-invariant distribution of the number of sides in a bulk froth at long times. We also discuss the apparent failure of the hypothesis that all internal angles in a froth are 120\i…
Real time in-situ optical measurements play a vital role in the monitoring and control of thin film deposition and etching. Techniques include single and multiwavelength monitoring of the reflectance and/or transmittance of the coating substrate, in-situ ellipsometry, and spectroscopic diagnostics of the vapour specie…
We have made multiple replacements (alanine, arginine, cysteine, histidine, isoleucine, serine, tyrosine) of valine-75 in dihydrofolate reductase from Escherichia coli to examine the relative importance to protein folding of the position that is substituted and the specific character of the amino acid replacement. Val…
As simple model density functional Hamiltonian is shown to lead to a consistent static and dynamical theory of the structural glass transition where glassy metastable free-energy states play a key role. The crucial concept introduced is a probabilistic order parameter description that results when multiple solutions o…
Monodisperse distributions of 1.01 mu m and 2.88 mu m polystyrene microspheres in monolayers on the surface of water were used in a study of isothermal-expansion melting in two dimensions. The equation of state, defect structures, and the translational and orientational correlation functions were obtained from digitis…
There has emerged recently a new theoretical picture of the way in which patterns are formed in dendritic crystal growth and in the closely analogous phenomenon of viscous fingering in fluids. Some interesting questions that arise in connection with this theory include: How broad is its range of validity? How do we un…
Basic lead styphnate RD 1349 forms the primary explosive component of several high temperature fuzehead formulations and percussion primers. A study of its thermal decomposition under controlled conditions near its ignition temperature (521–525 K) shows that it decomposes very rapidly, following a second order autocat…
Reaction of 1,3,5-tris(dimethylamino)benzene (TDMAB ) with 1,2,3,4,5,6-hexacyanobenzene (HCNB) in acetonitrile solution gives - depending on the crystallization method - two different products: dark needles of a 1:1 (1) and black compact crystals with a metallic lustre of a 2:1 (2) charge transfer complex. 2 crystalli…
Abstract Novel poly(amide‐sulfonamide)s have been prepared by reacting terephthaloyl, isophthaloyl, and sebacoyl chloride with variously substituted dianilines containing preformed sulfonamide linkages. Inherent viscosities of the prepared polymers ranged from 0.19 to 0.58 dL/g. Despite low apparent viscosities, the p…