Materials Literature
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The material properties of lead zirconate titanate (PZT) ceramics for operation in the thickness mode at frequencies as high as 80 MHz are reported. Each of the ceramics tested showed a reduction in k (t) with increasing frequency. In a fine-grained PZT, values of k(t) as high as 0.44 were measured at 80 MHz. The effe…
The dielectric spectroscopy of lead magnesium niobate relaxor ferroelectrics has been investigated over the frequency range of 102 to 107 Hz. The imaginary component was found to become nearly frequency independent below a freezing temperature, and scaled to a phenomenological equation involving the Vogel-Fulcher rela…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTEffect of monomer structure and compressibility on the properties of multicomponent polymer blends and solutions. 2. Application to binary blendsJacek Dudowicz, Michele S. Freed, and Karl F. FreedCite this: Macromolecules 1991, 24, 18, 5096–5111Publication Date (Print):Septe…
Chemical reactions of and have been analyzed using chemical potential diagrams for the La‐Zr‐M‐O systems under a condition of . A vs. plot is appropriate for representing diffusion paths, because the layered arrangement of the reaction zone corresponds well to the geometrical configuration of stability polygons of rea…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTEffect of hydrogen bonding on the enthalpy of mixing and the composition dependence of the glass transition temperature in polymer blendsPaul C. Painter, John F. Graf, and Michael M. ColemanCite this: Macromolecules 1991, 24, 20, 5630–5638Publication Date (Print):September 1…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTSelf-assembly of porphyrins on nucleic acids and polypeptidesRobert F. Pasternack, Antonino Giannetto, Pamela Pagano, and Esther J. GibbsCite this: J. Am. Chem. Soc. 1991, 113, 20, 7799–7800Publication Date (Print):September 1, 1991Publication History Published online1 May 2…
ABSTRACT The glass transition dispersion in the mechanical spectrum was measured for polybutadienes of various vinyl content and for polyisoprene. The breadths of spectra were found to parallel the concentration of pendant vinyl groups on the main chain. Consistent with results on many other materials, the shape of th…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTPhotophysical investigation of similarities between starburst dendrimers and anionic micellesK. R. Gopidas, A. R. Leheny, G. Caminati, Nicholas J. Turro, and Donald A. TomaliaCite this: J. Am. Chem. Soc. 1991, 113, 19, 7335–7342Publication Date (Print):September 1, 1991Publi…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTNew polymers with large and stable second-order nonlinear optical effectsMai Chen, Luping Yu, Larry R. Dalton, Yongqiang Shi, and William H. SteierCite this: Macromolecules 1991, 24, 19, 5421–5428Publication Date (Print):September 1, 1991Publication History Published online1…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTHighly oxidation resistant inorganic-porphyrin analog polyoxometalate oxidation catalysts. 2. Catalysis of olefin epoxidation and aliphatic and aromatic hydroxylations starting from .alpha.2-P2W17O61(Mn+.cntdot.Br)(n-11) (Mn+ = Mn3+,Fe3+,Co2+,Ni2+,Cu2+), including quantitati…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTMolecular and supermolecular origins of enhanced electric conductivity in template-synthesized polyheterocyclic fibrils. 1. Supermolecular effectsZhihua Cai, Junting Lei, Wenbin Liang, Vinod Menon, and Charles R. MartinCite this: Chem. Mater. 1991, 3, 5, 960–967Publication D…
A hydrothermal method for preparing thin films of crystalline PZT was developed by controlling the rates of nucleation and crystal growth. This method consisted of two steps of hydrothermal reaction. The first step (nucleation process) was that in which the TiO 2 substrate reacted with the mixed solution of Pb and Zr…
Over the past decade and a half, analyses of the dynamics of fluids containing moving contact lines have specified hydrodynamic models of the fluids in a rather small region surrounding the contact lines (referred to as the inner region) which necessarily differ from the usual model. If this were not done, a singulari…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTThe electronic structure and second-order nonlinear optical properties of donor-acceptor acetylenes: a detailed investigation of structure-property relationshipsAlbert E. Stiegman, Eva Graham, Kelly J. Perry, Lutfur R. Khundkar, L. T. Cheng, and Joseph W. PerryCite this: J.…
The switching behavior of ferroelectric capacitors experiencing arbitrary time-dependent electric fields and arbitrary initial conditions is investigated both theoretically and experimentally. A general approach for modeling incomplete dipole switching in ferroelectric capacitors is used to derive equations describing…
ADVERTISEMENT RETURN TO ISSUEPREVArticleRecent advances in alkoxo and aryloxo chemistry of scandium, yttrium and lanthanoidsRam C. Mehrotra, Anirudh. Singh, and Upendra M. TripathiCite this: Chem. Rev. 1991, 91, 6, 1287–1303Publication Date (Print):September 1, 1991Publication History Published online1 May 2002Publish…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTElectrochemical polymerization of thiophenes in the presence of bithiophene or terthiophene: kinetics and mechanism of the polymerizationYen Wei, Chi Cheung Chan, Jing Tian, Guang Way Jang, and Kesyin F. HsuehCite this: Chem. Mater. 1991, 3, 5, 888–897Publication Date (Print…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTDesign and Applications of Highly Luminescent Transition Metal ComplexesJ. N. Demas and Β. A. DeGraffCite this: Anal. Chem. 1991, 63, 17, 829A–837APublication Date (Print):September 1, 1991Publication History Published online30 May 2012Published inissue 1 September 1991https…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTIn aqua synthesis of water-soluble poly(p-phenylene) derivativesThomas I. Wallow and Bruce M. NovakCite this: J. Am. Chem. Soc. 1991, 113, 19, 7411–7412Publication Date (Print):September 1, 1991Publication History Published online1 May 2002Published inissue 1 September 1991h…
Research News: The pores in a microporous membrane can act as templates for the synthesis of polymeric and metallic microtubules. The tubules thus produced (see Figure) have monodispersed diameters and lengths and potential applications ranging from drug‐delivery systems to microwave components and in electronic and o…