Materials Literature
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The different species formed when gaseous formaldehyde is dissolved in aqueous medium are investigated by a 13 C NMR flow-through technique and the spectra of commercial aqueous formaldehyde solutions containing methanol completely interpreted. 13 CH 2 O was used to study the crosslinking reaction with gelatin which…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTThermal degradation of aromatic-aliphatic polyethers. 1. Direct pyrolysis-mass spectrometryG. Montaudo, C. Puglisi, E. Scamporrino, and D. VitaliniCite this: Macromolecules 1986, 19, 3, 870–882Publication Date (Print):March 1, 1986Publication History Published online1 May 20…
Abstract This paper presents some experimental data on inverse relaxation exhibited by yarns spun from cotton, polyester, viscose rayon, and jute fibers. Inverse relaxation (IR) is the building up of tension in a viscoelastic material that has been allowed to recover a part of the initial extension it is subjected to.…
The physical and chemical properties of carbon films, about 0.5 mu thick, deposited at low temperature (40-200 degrees C) by a new physical vapour deposition technique are presented, in comparison with those of pyrolytic carbon normally used in biomedical devices. Several analytical techniques have revealed that the t…
Two new C21 steroidal constituents, named otophylloside A(IV) and otophylloside B(V), have been isolated from the roots of Cynanchum otophyllum Schneid, whose structures have been analysed in this paper by using X-ray crystallography and spectrometric data (UV, IR, 1H- and 13C-NMR, MS) and chemical reaction. They were…
The absorptive capacities of 4 commercially available tear test strips were determined and compared with 5-mm X 40-mm strips of #41 filter paper. Significant differences in the absorption of water over a given time interval were found in 3 of the groups tested. Major inconsistencies were found only within 1 lot of tea…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTRadical mechanism for the decomposition of diethyl[2,3,7,8,12,13,17,18-octaethylporphyrinato(2-)]ruthenium. Determination of the metal-carbon bond dissociation energyJames P. Collman, Lisa. McElwee-White, Penelope J. Brothers, and E. RoseCite this: J. Am. Chem. Soc. 1986, 10…
Abstract Baghdadite, a new calcium zirconium silicate mineral has been found in melilite skarn in contact with banded diorite, from the Qala-Dizeh region, NE Iraq. Electron microprobe analysis yielded: SiO 2 = 29.26, ZrO 2 = 27.00, TiO 2 = 2.11, Fe 2 O 3 = 0.11, Al 2 O 3 = 0.03, MgO = 0.05, CaO = 41.44, Na 2 O = 0.02,…
A Fourier-transform absorption spectrum of the three silicium isotopes of silane in natural abundance have been recorded from 840 to 1040 cm −1 . The line width is 3 × 10 −3 cm −1 and the absolute accuracy is estimated to be about 2 × 10 −4 cm −1 for non-saturated and non-overlapped lines. The analysis of this spectru…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTTime-resolved light scattering studies on kinetics of phase separation and phase dissolution of polymer blends. 4. Kinetics of phase dissolution of a binary mixture of polystyrene and poly(vinyl methyl ether)Jiro Kumaki and Takeji HashimotoCite this: Macromolecules 1986, 19,…
Slowly sinking particles exchange mass with their liquid environment if dissolution processes within the particles maintain a surface concentration excess or deficiency χ 0 of a soluble substance above background. If the exchange is controlled by diffusion in the liquid phase, the total mass loss is proportional to χ…
Abstract not Available.
Abstract Four solid phases of CH3NH3I named as α′, β′, δ, and ε were studied by the temperature dependence of 1H spin-lattice relaxation time T1 and 1H spin–spin relaxation time T2 (for ε) at several NMR frequencies, and of 1H NMR second moment. Phase transitions were studied by means of differential thermal analysis…
By doping Li2CO3, Na2CO3, B2O3 and Bi2O3 into PLZT 8/65/35, the diffuse phase transition is enhanced and the sintering temperature is lowered. In order to balance out the charge fluctuations caused by doping, a R-a-R3+b pair doping is adopted. Low temperature coefficient of capacitance (TCC) of the doped PLZT 8/65/35…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTKinetics and reaction pathways of methanol oxidation on platinumR. W. McCabe and D. F. McCreadyCite this: J. Phys. Chem. 1986, 90, 7, 1428–1435Publication Date (Print):March 1, 1986Publication History Published online1 May 2002Published inissue 1 March 1986https://pubs.acs.o…
Results are reported of light scattering and dielectric measurements on solutions of 4-n-pentyl-4′-cyanobiphenyl (5CB) and 4-n-pentyl-4′-cyanobicyclo-hexane (5CCH). Correlation factors g 1 and g 2 are deduced from the measurements, and are discussed in terms of a model for molecular association. It is concluded that a…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTHydrophilic-hydrophobic interpenetrating polymer networks (IPN's) synthesized under high pressure. 1. Morphology, dynamic mechanical properties, and swelling behavior of polyurethane-polystyrene IPN'sJae Heung Lee and Sung Chul KimCite this: Macromolecules 1986, 19, 3, 644–6…
The enhanced fracture toughness due to stress‐induced transformation can be explained from two viewpoints: (1) the increase can be attributed to the need to supply a work of transformation, or (2) the transformation can be considered to result in internal stresses which oppose crack opening. Experimental results for m…
The bicarbonate ion has been implicated as a causative agent in iron chlorosis induced by high moisture in calcareous soils. Our studies have demonstrated a correlation between soil solution bicarbonate and chlorosis in soybeans in fields in western Minnesota and under growth chamber conditions. In the growth chamber…
Abstract Previously we reported differences in nutrient availability of desert grassland soils under mesquite [ Prosopis juliflora (Schwartz) DC] trees and adjacent open areas. In a related study conducted at that same time (1967), several mesquite trees were removed to measure shading effects. Since then about half o…