Materials Literature
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It is shown that hydrodynamic interactions between non-Brownian, non-spherical, sedimenting particles give rise to an increase in the number of neighbouring particles in the vicinity of any given particle. This result suggests that the suspension is unstable to particle density fluctuations even in the absence of iner…
The effects of a forced flow on dendritic growth rate are studied theoretically. By using a solvability condition, one determines the eigenvalue C=${\ensuremath{\rho}}^{2}$V/${\mathrm{Dd}}_{0}$ as a function of the velocity of the forced flow in the two-dimensional model. Even in the presence of crystalline anisotropy…
(1989). SURFACE MODIFICATION OF POLYESTER BY ALKALINE TREATMENTS. Textile Progress: Vol. 20, No. 2, pp. 1-26.
Polarized and unpolarized neutron measurements have been performed on ${\mathrm{LaCoO}}_{3}$ in a temperature range between 10 and 295 K. A drastic decrease in the magnetic cross section is observed below 150 K. This is the first concrete experimental evidence for the temperature-induced magnetic moment of Co ions in…
A two-dimensional system of hard cyclic hexamers is shown to display an anomalous (negative) Poisson ratio in a high-density crystalline phase. The anomaly can be reproduced qualitatively by a simple free-volume (FV) approximation. The FV approximation and a lattice model indicate the crucial role of broken mirror sym…
X-ray powder patterns obtained from three different types of 35–40 Å CdSe nanoclusters are analyzed. We simulate the effects of thermal fluctuations, stacking faults, surface reconstructions, and bond compressions on powder patterns of CdSe clusters using the Debye formula. We find that the spectra of capped and annea…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTCharacteristics of the surface-induced orientation for symmetric diblock PS/PMMA copolymersThomas P. Russell, G. Coulon, V. R. Deline, and D. C. MillerCite this: Macromolecules 1989, 22, 12, 4600–4606Publication Date (Print):December 1, 1989Publication History Published onli…
The organization of apatite crystals and collagen fibrils in mineralized turkey tendon has been studied by electron microscopy and electron diffraction. To minimize artifactual distortions the tissue was examined, for the first time, as isolated fibrils in an aqueous environment of vitreous ice, as well as in conventi…
Abstract Poly(3‐hexylthiophene) (PT6), poly(3‐octylthiophene) (PT8), poly(3‐decylthiophene) (PT10) and poly(3‐dodecylthiophene) (PT12) were synthesized by electrochemical and chemical polymerization. Investigation of these polymers by means of gel permeation chromatography indicates that the polymers prepared from the…
Dielectric and pyroelectric properties of relaxor ferroelectric in the (1-x) Pb(Mg1/3Nb2/3)O3-xPbTiO3 solid solution series have been investigated. The dielectric constant (K) and loss of poled and unpoled ceramic samples were determined. The pyroelectric coefficient and the spontaneous polarization were measured by t…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTPhotochemistry of azobenzene-containing polymersG. Sudesh Kumar and D. C. NeckersCite this: Chem. Rev. 1989, 89, 8, 1915–1925Publication Date (Print):December 1, 1989Publication History Published online1 May 2002Published inissue 1 December 1989https://pubs.acs.org/doi/10.10…
Symptomatic vascular disease involving blood vessels smaller than 6 mm internal diameter constitutes the majority of vascular disease cases. In many cases the only correction for the condition is vascular reconstruction, or bypass surgery. The only adequate replacement for these vessels at the present time are autolog…
Measurements of the dynamic modulus and internal friction of ultra-high-purity aluminium were performed during irradiation with fast electrons at 5.7 K (or 60 K) and subsequent anneals, using a vibrating strip system. The salient result is that the introduction of point defects on the existing dislocations during irra…
Pulses of 193 nm radiation from an ArF laser with energies exceeding 0.5 J/cm2 have been shown to modify 40–60 nm thick layers of {100} and {110} oriented diamond surfaces. These layers exhibit highly anisotropic electrical and optical properties which have principal in-plane axes along the 〈110〉 directions. The minim…
Abstract Plasam polymerization of hydrocarbon/sulfure dioxide mixtures, C 2 H/SO 2 , C 2 H 4 /SO 2 , and CH 4 /SO 2 mixtures, was investigated to obtain thin films containing sulfonic acid groups. Plasma polymerization of C 2 H 2 /SO 2 and C 2 H 2 /SO 2 mixtures gave filmlike products but that of the CH 4 /SO 2 mixtur…
I n situ mass spectral measurements of gas composition at the substrate surface were made during filament-assisted diamond growth. The input gases were various mixtures of CH4, O2, and H2 chosen in order to discern the effects of oxygen addition on diamond formation and growth. The gas phase chemistry was modeled as a…
Crystallization of lysozymes induced by temperature lowering has been monitored by dynamic light scattering from the onset of supersaturation to the growth of protein crystals up to a noticeable size (150–200 μm). The apparent size of the scatterers was found to increase up to a maximum value as supersaturation procee…
Band-structure calculations of CrS, CrSe, Cr 3 Se 4 and CrSb are presented. Together with the accompanying results for the chromium tellurides, these calculations give a coherent picture of the changes in the electronic structure caused by anion substitution and by introduction of cation vacancies. The importance of t…
Electronic band-structure calculations are presented for the ferromagnetic compounds CrTe, Cr 3 Te 4 and Cr 2 Te 4 and Cr 2 Te 3 . In these compounds the Cr3d-Te5p covalency and the Cr3d(z 2 )-Cr3d(z 2 )-overlap along the c axis are the most important interactions. The magnetic polarisation of Te is parallel to the Cr…
The surface forces apparatus technique was used for measuring the adhesion, deformation, and fusion of bilayers supported on mica surfaces in aqueous solutions. The most important force leading to the direct fusion of bilayers is the hydrophobic interaction, although the occurrence of fusion is not simply related to t…