Materials Literature
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In the principle of optical crystallography and crystal symmetry, it is found that at room temperature, the 0.67 PMN-0.33 PT crystals near the morphotropic phase boundary composition present not only a rhombohedral $3m$ phase but also a monoclinic m phase with various angles of polarization rotation, the third ferroel…
A model is proposed to explain temporal patterns of activity in a class of periodically exploding Strombolian-type volcanos. These patterns include major events (explosions) which follow each other every 10-30 minutes and subsequent tremor with a typical period of 1 second. This two-periodic activity is thought to be…
We study theoretically a binary system in which an attraction of unlike particles is combined with a type-independent soft core repulsion. The possible experimental implementation of the system is a mixture of DNA-covered colloids, in which both the repulsion and the attraction may be induced by DNA solution. The syst…
We investigate an $S=1/2$ two-leg spin ladder with a cyclic four-spin exchange interaction whose interaction constant is denoted by $J_4$, by using the density matrix renormalization group method. The interchain and the intrachain interaction constant are denoted by $J_{rung}$ and $J_{\rm leg}$, respectively and assum…
The preparation, type, and stability of emulsions of oil and water stabilized solely by spherical, monodisperse polystyrene latex particles of different size is described. Two types of behavior occur depending on whether particles remain intact (in the case of cyclohexane) or dissolve to give free polymer chains (in t…
Analysis of isothermal and nonisothermal crystallization kinetics of nylon 66 was carried out using differential scanning calorimetry (DSC). The commonly used Avrami equation and that modified by Jeziorny were used, respectively, to fit the primary stage of isothermal and nonisothermal crystallizations of nylon 66. In…
The results of dielectric measurements $(f=10 \mathrm{kHz}--400 \mathrm{MHz})$ of the natural mineral lawsonite are presented in the region of the ferroelectric transition ${(T}_{2}\ensuremath{\approx}124 \mathrm{K}).$ The dielectric behavior is characterized by a small value of the Curie-Weiss constant ${(C}_{\mathrm…
The mean-squared displacement (MSD) of a hard sphere and of a dumbbell molecule consisting of two fused hard spheres immersed in a dense hard-sphere system is calculated within the mode-coupling theory for ideal liquid-glass transitions. It is proven that the velocity correlator, which is the second time derivative of…
The reverse Monte Carlo RMC method has shown to be a useful tool for extracting structural properties from diffraction data of disordered systems, such as ion-conducting glasses. In this paper we investigate ion conduction in Ag-based superionic glasses by simple random-walk simulations based on the bond-valence infor…
The paper examines different definitions of the local atomic stress at zero temperature for homogeneous and inhomogeneous strain across an interface. It is shown that if inhomogeneous straining occurs within the range of interatomic interaction, then the interplanar concept (based on force balance) describes better th…
To assess the binding of individual amino acids to the principal calcium minerals found in human kidney stones, the adsorption of 20 amino acids on to calcium oxalate monohydrate, CaHPO4*2H2O, Ca3(PO4)2 and Ca5(PO4)3OH crystals was determined over the physiological urinary pH range (pH 5-8) in aqueous solutions. All a…
We have studied phthalocyaninatosilicon (SiPc) covalently linked to one nitroxide radical by the combined use of transient absorption and time-resolved electron paramagnetic resonance (TREPR) spectroscopies and succeeded in clarifying the relationship between the electron spin polarization (ESP), excited-state lifetim…
Resistivity, magnetoresistance, and M\"ossbauer effect of metallic spiral antiferromagnet ${\mathrm{SrFeO}}_{2.95}$ have been examined in the temperature range 4.5--300 K. A large negative magnetoresistance below 50 K is observed. We find hysteresis in resistivity in 0 and 9 T due to the coexistence of antiferromagnet…
ADVERTISEMENT RETURN TO ISSUEPREVCommunicationNEXTLight-Driven Catalysis within Dendrimers: Designing Amphiphilic Singlet Oxygen SensitizersStefan Hecht and Jean M. J. FréchetView Author Information Department of Chemistry, University of California Berkeley, California 94720-1460 Cite this: J. Am. Chem. Soc. 2001, 123…
Intramolecular Förster-type excitation energy transfer (FRET) processes in a series of first-generation polyphenylene dendrimers substituted with spatially well-separated peryleneimide chromophores and a terryleneimide energy-trapping chromophore at the rim were investigated by steady-state and time-resolved fluoresce…
Monte Carlo simulations combined with the embedded-atom method potential have been employed to investigate the microscopic process of the $\ensuremath{\Sigma}5$ tilt grain boundary sliding in aluminum. We have studied the atomic structures and the grain boundary sliding/migration energy profile at elevated temperature…
BaGa2Sb2 was obtained from a direct element combination reaction in a sealed graphite tube at 950 degrees C, and its structure was determined by single-crystal X-ray diffraction methods. It crystallizes in the orthorhombic space group Pnma (No. 62) with a = 25.454(5) A, b = 4.4421(9) A, c = 10.273(6) A, and Z = 8. The…
Ultrasmall CdS nanoparticles were prepared by the size-selective photoetching technique. The smallest size of the CdS nanoparticles was obtained by the irradiation with the monochromatic light having the wavelength of 365 nm, while the absorbance of CdS nanoparticles monotonically decreased, for the whole wavelength,…
Novel bolaamphiphiles, consisting of a biphenyl rigid core, polar 2,3-dihydroxypropoxy groups at each terminal end, and an additional long alkyl chain in a lateral position have been synthesized. The structures of these ternary block molecules were systematically changed by variation of the length and position of the…
A new tabulation of atomic form factors is discussed briefly, extending the validity of the isolated atom approximation and serving as a baseline for near-edge solid-state and XAFS investigations. This is detailed by Chantler [J. Phys. Chem. Ref. Data, (2000), 29, 597-1048] and is the latest component of the FFAST tab…