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Abstract Hot‐stage polarized light microscopy suggests that bulk hydroxypropylcellulose (Hercules Klucel E) is a cholesteric liquid crystal. Rheological measurements indicate this system exhibits shear viscosities similar to those of polyolefin melts except that it has a yield value comparable to suspensions. Birefrin…
Silicon dioxide films have been deposited by reacting silane and nitrous oxide in a parallel‐plate, radial flow, plasma reactor. Deposition parameters (temperature, power, and gas composition) have been systematically varied, and the films characterized by measuring the infrared spectra, deposition rate, density, etch…
Abstract The synthetic route to polyetherimides by displacement of nitro‐groups from disubstituted bis‐imides by the dianion of bisphenols are described. The prepration of bis‐imides and bisphenol dianions, their polymerization, and some of the properties of the polymers are presented in detail. The 13 C‐NMR spectra o…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTSilicon-29 CP/MAS NMR studies of methylchlorosilane reactions on silica gelDean W. Sindorf and Gary E. MacielCite this: J. Am. Chem. Soc. 1981, 103, 14, 4263–4265Publication Date (Print):July 1, 1981Publication History Published online1 May 2002Published inissue 1 July 1981h…
The crystal structure of avian pancreatic polypeptide (aPP), a 36-residue polypeptide with some hormonal properties, has been determined by using single isomorphous replacement and anomalous scattering to 2.1-A resolution. The phases were extended to 1.4-A resolution by using a modified tangent formula. The molecule c…
Abstract: SUMMARY: Many phyllosilicate minerals gain greatest mechanical stability on sedimentation by orienting themselves parallel to bedding. Loss of water during the initial stages of compaction also promotes or enhances such a preferred alignment. If the mineral is then buried in the absence of tectonic stress, s…
A new approach is presented for understanding the frequency and flux density dependence of eddy current losses in polycrystalline and amorphous soft magnetic materials by introducing an experimentally derived parameter which is thought to be proportional to the number of active domain walls. The relationship among edd…
Abstract The orientation of nematic liquid crystals (LC) by monolayers of suitable amphiphilic compounds on solid substrates has been studied by systematic experiments using polarizing microscopy, magnetic Freedericksz‐transition, and contact angle measurements. Orientation is influenced mainly by the following parame…
In heat exchange equipment, fouling biofilm formation causes a significant energy loss by increasing heat transfer resistance. This paper describes experiments which quantify the influence of fouling biofilms on heat transfer resistance under controlled laboratory conditions. Experimental results compare well with a r…
The fracture toughnesses of fused SiO 2 and float glass were measured at high temperatures. In both glasses, low‐temperature regions of elastic fracture were identified and correlated with the elastic moduli and their temperature dependence. A viscous flow contribution to the fracture toughness was identified in the f…
Advanced sintering techniques for consolidation of Si 3 N 4 powders in the presence of an oxygen‐rich liquid phase(s) require high temperatures and usually high nitrogen pressures. A stability diagram is constructed for Si 3 N 4 as a function of the partial pressures of nitrogen (P N2 ) and silicon (P Si ). High P N2…
Abstract The spin‐lattice relaxation times T 1 of the oxygen‐17 isotope in light and heavy water have been measured at 13.56 MHz in the temperature range 457 K to 238 K and up to pressures of 250 MPa. Below 300 K all isotherms exhibit maxima of T 1 which become most pronounced at the lowest temperatures measured. A ma…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTUse of the Jahn-Teller theorem in inorganic chemistryJeremy K. BurdettCite this: Inorg. Chem. 1981, 20, 7, 1959–1962Publication Date (Print):July 1, 1981Publication History Published online1 May 2002Published inissue 1 July 1981https://pubs.acs.org/doi/10.1021/ic50221a003htt…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTDerivatives of heteropolyanions. 3. O-alkylation of Mo12PO403- and W12PO403-W. H. Knoth and R. L. HarlowCite this: J. Am. Chem. Soc. 1981, 103, 14, 4265–4266Publication Date (Print):July 1, 1981Publication History Published online1 May 2002Published inissue 1 July 1981https:…
Abstract The goal of this series of reports is to develop rapid computational procedures for determining the rearrangement of fibers that occurs during the molding of continuous fiber composite components for flat layups. This report considers the shaping of a cloth into a hemisphere. /the numerical procedure develope…
The photovoltaic properties of p-Zn3P2/n-ZnO heterojunction solar cells prepared by sputter deposition of ZnO on Zn3P2 substrates are reported. An active-area power conversion efficiency of ∼2% has been obtained. The experimental results are discussed on the basis of an interface recombination model. The interface pla…
Fretting corrosion of stainless-steel round hole plates and spherical head screws was studied using a simulator that produced a rocking motion of the heads in the plate holes. Experiments were run for 7 days, with the simulator producing 1 oscillation/s for 16 h/day. Fretting corrosion was studied in 0.9% NaCl and in…
A rational function approximation for magnetization curves and hysteresis loops is presented. This approximation leads to Rayleigh relations and the law of approach to saturation as limit forms. Furthermore, the magnetic permeability and the magnetic energy density is computed. Finally, this analysis is applied to com…
Reduction of Pt/Ti02 at 573 K leads to the formation of a Ti3+ ESR signal, which disappears after a subsequent evacuation at 573 K. Readmission of hydrogen at room temperature makes the signal reappear.Such a reversibility is not observed when reduction takes place at 773 K.These observations are explained by a spillo…
The solid‐state reactions occurring in the system PbO‐TiO 2 ‐ZrO 2 were investigated using constant heating rates up to 1000°C. DTA, dilatometric length changes, and XRD analysis were used for characterization. PbO and TiO 2 reacted exothermally to form the product PbTiO 3 with a large volume expansion between 450° an…