Materials Literature
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We have studied the effect of the polymer tilt angle for pretilt angle generation in nematic liquid crystal, 4-cyano-4 ′ -n-penthylbiphenyl (5CB) on rubbed polyimide surfaces. The polymer tilt angle was determined by measuring induced optical retardation produced in rubbed polyimide (PI) surfaces by rubbing. We sugges…
In a discrete phenomenological description of tilted smectic phases, the order parameter, which describes the magnitude and the direction of the tilt of the molecules, is defined for each smectic layer. The free energy expansion in terms of order parameter takes into account interactions between nearest and next neare…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTThe Bare and Acetylene Chemisorbed Si(001) Surface, and the Mechanism of Acetylene ChemisorptionQiang Liu and Roald HoffmannCite this: J. Am. Chem. Soc. 1995, 117, 14, 4082–4092Publication Date (Print):April 1, 1995Publication History Published online1 May 2002Published inis…
Controlled studies of the effect of moisture content on the corrosivity of toward common materials of construction were performed. Coupons of EP316L stainless steels, two types of stainless steel welds, and Hastelloy C‐22 were exposed to containing 0.5, 10, 100, and 1000 ppm moisture. The coupons were exposed to for 1…
Abstract Non‐isothermal TG curves for four samples of polyvinyl nitrate (PVN), having 15.71%, 14.95%, 13.34% and 11.76% nitrogen contents, were obtained at 5°C/min heating rate. The weight loss of PVN samples depends directly on their % N and occurs in three or more temperature zones. For PVN with 15.71% N (max 15.73%…
Knowledge of the kinetics of phenolic resin pyrolysis is critical to the accurate modeling of ablatives used in rocket nozzle and re-entry environments. Most employ thermogravimetry to study this phenomena. Nearly all of the previous studies on ablative materials have utilized fairly slow heating with respect to the u…
Summary The initial results of the first dedicated confocal scanning laser microscopy (CSLM) study of fluid inclusions in quartz are presented. CSLM imaging of a large inclusion shows the quartz crystal to contain numerous small (< 1 μm), highly reflective inclusions arranged along planes in at least two directions…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTEffect of Pretreatment on Surface Area, Porosity, and Adsorption Properties of a Carbon BlackNalini Krishnankutty and M. Albert VanniceCite this: Chem. Mater. 1995, 7, 4, 754–763Publication Date (Print):April 1, 1995Publication History Published online1 May 2002Published ini…
Using a combination of biochemical, physical, and genetic techniques, we have shown that the umpA gene of Escherichia coli is allelic with the lgt (phosphatidylglycerol:prolipoprotein diacylglyceryl transferase) of Salmonella typhimurium. These genes are essential for the viability of the respective organism and exhib…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTCrystalline Homopolymer-Copolymer Blends: Poly(tetrafluoroethylene)-Poly(tetrafluoroethylene-co-perfluoroalkylvinyl ether)J. Runt, L. Jin, S. Talibuddin, and C. R. DavisCite this: Macromolecules 1995, 28, 8, 2781–2786Publication Date (Print):April 1, 1995Publication History…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTPolyoxometalate-Diphosphate Complexes. 3. Possible Intermediates in the Molybdate-Catalyzed Hydrolysis of Pyrophosphate. The Structure of Hexamolybdomethylenediphosphonate, [(O3PCH2PO3)Mo6O18(H2O)4]4-Uli Kortz and Michael T. PopeCite this: Inorg. Chem. 1995, 34, 8, 2160–2163…
Abstract Intercalation complexes of a Hungarian kaolinite were prepared with hydrazine and potassium acetate. The thermal behavior and decomposition of the kaolinite-potassium acetate complex was studied by simultaneous TA-EGA, XRD, and FTIR methods. The intercalation complex is stable up to 300°C, and decomposition t…
Decarbonization of resin‐bonded magnesia‐graphite refractories, as one of the most important parameters for brick lining performance in service, has been studied kinetically in the temperature range from 1000° to 1400°C in air, where carbon burnout by oxygen is the dominant decarbonizing mechanism. The rate of carbon…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTPhase Behavior of Blends of Poly(ethylene glycol) and Partially Neutralized Poly(acrylic acid)Xinya Lu and R. A. WeissCite this: Macromolecules 1995, 28, 9, 3022–3029Publication Date (Print):April 1, 1995Publication History Published online1 May 2002Published inissue 1 April…
Raman experiments have been carried out on single crystals of ${\mathrm{BaTiO}}_{3}$ as a function of pressure up to 3.5 GPa across the ferroelectric (tetragonal) to paraelectric (cubic) phase transition. The unusual features in the Raman spectra associated with the interference effects due to coupling of the three ${…
The trapping of charges in hard dielectric materials has been recently described [G. Blaise, IEEE Trans. Electr. Insul. EI-28, 437 (1993)] on the basis of the polaron concept. A local increase of the internal energy of the medium Up∼5–10 eV results from the polarization around a trapped charge. The relaxation of the l…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTReliable Measurements of the Nylon 6 Glass Transition Made Possible by the New Dynamic DSCYash P. Khanna, William P. Kuhn, and William J. SichinaCite this: Macromolecules 1995, 28, 8, 2644–2646Publication Date (Print):April 1, 1995Publication History Published online1 May 20…
Localization due to space structure, rather than due to randomness, is investigated by studying the usual tight-binding model on the Sierpinski gasket. Some exact results are obtained from the decimation--renormalization-group method. It is surprising that there exist an infinite number of extended states on the Sierp…
Various types of molecular bearings have recently been proposed in the growing nanotechnology literature. Using novel molecular dynamics methods, we have simulated several model graphite bearings. The bearings varied in size from inner shafts of between 4 and 16 A in diameter, up to 120 A in length, and outer cylinder…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTSynthesis, Structure, and Spectroscopic Properties of Bismuth Citrate Compounds and the Bismuth-Containing Ulcer-Healing Agent Colloidal Bismuth Subcitrate (CBS). 4. Crystal Structure and Solution Behavior of a Unique Dodecanuclear Cluster (NH4)12[Bi12O8(cit)8](H2O)10Eiji As…