Materials Literature
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The lifetime of luminescence in NaCl:${\mathrm{Yb}}^{2+}$ crystals has been investigated using a streak-camera method. Two emission bands peaking at 400 and 432 nm (called bands I and II, respectively) are observed. In addition to a long lifetime of more than 0.3 ms previously observed for band II, it was observed tha…
The cells of the extreme thermophile Thermus thermophilus are surrounded by a regular layer (S-layer) built up by a protein with an apparent molecular mass of 100 kDa (P100). From purified membrane fractions, three different class of two-dimensional crystals can be obtained by following alternative extractive procedur…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTThermotropic liquid crystals in polypeptides with mesogenic side chains. 1Junji Watanabe and Toshihiko TominagaCite this: Macromolecules 1993, 26, 15, 4032–4036Publication Date (Print):July 1, 1993Publication History Published online1 May 2002Published inissue 1 July 1993htt…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTLiquid-crystalline polyethers based on conformational isomerism. 32. Effect of molecular weight on the phase behavior of linear and macrocyclic oligoethers and of linear polyethers based on 1-(4-hydroxy-4'-biphenylyl)-2-(4-hydroxyphenyl)butane and 1,10-dibromodecaneVirgil Pe…
Experiments have shown that there may be an optimal grain size which maximizes the toughness of polycrystalline ceramics. In this paper, we attempt to develop a theoretical model which can predict the effect of grain size on the toughness of ceramics. We assume that three principal mechanisms affect the toughness of t…
X-ray structure analyses of crystalline [NMe 4 ][B 5 O 6 (OH) 4 ] · nH 2 O with n ≈ 0.25-0.50 (1), [NEt 4 ][B 5 O 6 (OH) 4 ] (2), [NPhMe 3 ][B 5 O 6 (OH) 4 ] (3), and [pipH][B 5 O 6 (OH) 4 ] (4) reveal that these materials are novel clathrates with closely related three-dimensional host structures built up of hydrogen…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTReaction of aluminum hydride-triethylamine complex with selected organic compounds containing representative functional groupsJin Soon Cha and Herbert C. BrownCite this: J. Org. Chem. 1993, 58, 15, 3974–3979Publication Date (Print):July 1, 1993Publication History Published o…
Reduced no-load losses have resulted in increased susceptibility to ferroresonance of grounded wye-wye three-phase distribution transformers using five-leg silicon steel wound cores. The authors describe the results of an extensive test program which determined that overvoltages are directly related to the ratio of ca…
Abstract To better understand fabrics in dolomitized carbonates, aragonitic ooids were replaced with dolomite in laboratory experiments. Recent ooids from Cat Cay were reacted in a solution of 0.5 M MgCl 2 and 0.4 M CaCl 2 in Teflon-lined stainless steel bombs at 200 degrees C and equilibrium vapor pressure. X-ray dif…
α‐C 2 SH can be synthesized by hydrothermal treatment of lime and silicic acid for 2 h at 200°C. When heated to 390–490°C, α‐C 2 SH dissociates through a two‐step process to form an intermediate phase plus some γ‐C 2 S. This appears to be a new dicalcium silicate different from known dicalcium silicates—α, α′ L , α′ H…
Abstract The linear electro‐optic (Pockels) effect in a series of alkali metal acid phthalate crystals has been studied. Single electro‐optic coefficients r and r for sodium (NaAP), potassium (KAP) and rubidium (RbAP) acid phthalates have been measured by employing the modified Mach–Zehnder interferometric technique.…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTAminosilanes in organic synthesis. Preparation of new expanded porphyrin ligands and bimetallic transition-metal complexes. Crystal structure of a tetrapyrrole macrocycle dirhodium complexF. H. Carre, R. J. P. Corriu, Geng Bolin, J. J. E. Moreau, and C. VernhetCite this: Org…
The combined results of the present investigation of Nylon 5 and Nylon 9 and the previous investigation of Nylon 11 and Nylon 7 reveal that the odd-numbered nylons exhibit classic ferroelectric J-E and D-E hysteresis behavior at room temperature. In addition, the remanent polarization, P r, of Nylon 5 and Nylon 9 is f…
Abstract The reaction of [2.2]paracyclophane ( 1 ) with liquid bromine affords a 1:1 mixture of only two isomeric products, the pseudo‐para 2 and pseudo‐ortho tetrabromide 3 . The structure of the pseudo‐para isomer 2 has been determined by X‐ray structure analysis. Fourfold palladium‐catalyzed coupling with styrenes…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTHexaalkoxytricycloquinazolines: new discotic liquid crystalsSandeep Kumar, Ellen J. Wachtel, and Ehud KeinanCite this: J. Org. Chem. 1993, 58, 15, 3821–3827Publication Date (Print):July 1, 1993Publication History Published online1 May 2002Published inissue 1 July 1993https:/…
One of the most effective methods of controlling emissions of volatile organic compounds (VOCs) is also one of the most economical--adsorption, usually using activated carbon as the adsorbent. This process is cost-effective because it is typically able to recover many VOCs for reuse. A particularly common application…
The traditional approach used in modeling of composites reinforced by three-dimensional (3-D) braids is to assume a simple unit cell geometry of a 3-D braided structure with known fiber volume fraction and orientation. In this article, we first ex amine 3-D braiding methods in the light of braid structures, followed b…
Abstract This review presents a general picture of suspension, dispersion, and interfacial polycondensation processes employed for the preparation of beaded resins, dry powders, and high solid dispersions. The polymer systems covered include polyamides, polyesters, polycarbonates, polyurethanes, and phenol‐formaldehyd…
In high nitrogen stainless steels and nitrogen surface-doped Mo-containing alloys, nitrogen has been shown to enhance passivity. The mechanism of this apparent Mo–N synergism appeared to be twofold. First, the formation of stable surface nitrides affects a reduction in active dissolution, and, second, reactions betwee…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTUnexpected selectivity in the alkylation of polyazamacrocyclesWilliam J. Kruper Jr., Philip R. Rudolf, and Charles A. LanghoffCite this: J. Org. Chem. 1993, 58, 15, 3869–3876Publication Date (Print):July 1, 1993Publication History Published online1 May 2002Published inissue…