Materials Literature
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Luminescent silicon clusters have been synthesized by the chemical vapor deposition of Si 2 H 6 into the α-cages of H 32 Na 24 Y zeolite. The synthetic process was monitored by FTIR, TGA-MS, and 29 Si and 1 H solid-state NMR spectroscopies. In the initial step at 100 °C, Si 2 H 6 reacts with the Brønsted acid sites to…
The kinetic studies of the crosslinking reaction of a nadic end-capped imide model compound, N,N′-(oxydi-3,4′-phenylene) bis(5-norbornene-2,3-dicarboximide), a bisnadimide, in thermal and microwave processes were investigated. The conversion of the endo isomer to exo isomer proceeds at a much lower temperature than th…
We have carried out ab initio molecular orbital calculations on a cluster of atoms containing five SiO 3/2 O - Na + units connected at the corners by siloxane bonds to investigate the structure and vibrational properties of sodium disilicate glass. The optimized structural parameters (mean Si−O, O−O, and Na−O bond dis…
The effect of surfactants on single-bubble sonoluminescence (SBSL) is studied theoretically based on the hot-spot model that a SBSL bubble collapses quasiadiabatically and that the quasi-thermal radiation is the origin of the light emission. Stottlemyer and Apfel [J. Acoust. Soc. Am. 102, 1418 (1997)] reported that th…
Polycrystalline indium-tin-oxide (ITO) thin films were prepared at an ambient temperature by irradiation of amorphous (a-) ITO with KrF excimer laser pulses of ≥40 mJ/cm 2 /pulse. Electrical resistivity of the specimen at ∼300 K decreased from 5.9×10 -4 Ω·cm to 2.7×10 -4 Ω·cm upon laser crystallization. Irradiation of…
The effect of grain size on the colossal magnetoresistance mechanism is analyzed. While the metal-insulator transition temperature ${T}_{R\mathrm{max}}$ is markedly affected by the grain size, the magnetic transition temperature ${T}_{c}$ is not sensitive to the grain size. It is found that the surface phonon plays an…
The electrostatic binding of the anionic probes pyrenetetrasulfonic acid (4-PSA) and 6-carboxyfluorescein (6-CF) to poly(allylamine hydrochloride) (PAH), poly(diallyldimethylammonium chloride) (PDADMAC), and DADMAC−acrylamide (AAM) copolymers in aqueous solution has been investigated by fluorescence spectroscopy. Bind…
Evidence is accumulating for the major influence of the identities of counterions on syntheses and properties of various heteropoly anions. An easy and convenient NMR method is presented for evaluating the extent of significant association between heteropoly tungstate species and monoatomic metallic counterions (e.g.,…
Raman spectroscopy of two types of kaolinites has been obtained at liquid nitrogen temperature (77 K) with the use of a Raman microprobe and a thermal stage. The Raman spectrum is characterized by the combination of the frequencies of the inner hydroxyl and the inner surface hydroxyl groups. The inner hydroxyl frequen…
The interfacial reinforcement between polypropylene (PP) and amorphous polyamide (aPA) has been investigated by in-situ reactive compatibilization. PP reactivity with aPA was introduced by melt blending a certain amount of maleic anhydride grafted polypropylene (mPP) with pure PP. The effects of the mPP content, bondi…
Photochromism has been studied for two comb-like liquid-crystalline copolymers (I) and (II) containing azobenzene chromophores in their side chains. In a smectic glass phase of both copolymers, upon short-time irradiation by UV light, long-living cis isomers are observed. Both copolymers manifest the photoinduced anis…
BACKGROUND AND PURPOSE: We recently described an image analysis technique based on the temporal correlation mapping (TCM) of injected contrast agents that can be used to distinguish the hemodynamic core and hemodynamic penumbra after focal ischemia. In this study we used this technique for the first time to investigat…
Experimental determination of both the short-time self-diffusion coefficient and the high-frequency viscosity are reported for model charge-stabilized dispersions. Despite the charged nature of the particles, we find that both quantities are insensitive to direct interparticle interactions. Quantitative agreement betw…
ADVERTISEMENT RETURN TO ISSUEPREVCommunicationNEXTSuperconductor−Insulator Transition Controlled by Partial Deuteration in BEDT-TTF SaltAtsushi Kawamoto, Hiromi Taniguchi, and Kazushi KanodaView Author Information Department of Physics, Ochanomizu University Bunkyo-ku, Tokyo 112-0012, Japan Department of Applied Physi…
A new method is proposed for the quantitative description of all perovskite structures, ABX 3 . It extends earlier work on the relationship between polyhedral volume ratio V A /V B and octahedral tilt angles [Thomas (1996 a ). Acta Cryst. B 52 , 16–31] by defining additional parameters, \Gamma_i, which describe the pl…
Grazing incidence synchrotron X-ray diffraction (GID) studies of Langmuir monolayers of several substances such as 2-monopalmitoyl-glycerol, 2-hexadecanol, and 2-hydroxypalmitic acid reveal diffraction patterns that indicate a disordered packing of alkyl chains. The diffracted intensity is distributed along a characte…
Thin films of metal oxides are finding an increasing application in electronic devices and components in both civil and defense-related areas. These materials can be deposited by a number of methods, each of which has its merits. However, metal organic chemical vapor deposition (MOCVD) offers the most flexible approac…
The weakly electric-dipole-allowed midinfrared excitations are studied in insulating single crystals of ${\mathrm{La}}_{2}{\mathrm{CuO}}_{4},$ ${\mathrm{Sr}}_{2}{\mathrm{CuO}}_{2}{\mathrm{Cl}}_{2},$ and ${\mathrm{Nd}}_{2}{\mathrm{CuO}}_{4}.$ These intrinsic excitations of the undoped ${\mathrm{CuO}}_{2}$ layers are lo…
The response equations governing nonequilibrium solvation in the continuum approach are derived and implemented for second order in response theory. Applications to a simple benchmark system consisting of a solvated water molecule are presented. We consider the role of nonequilibrium solvent configurations on the firs…
We report the synthesis of acidic (Zn/Al-POM) and basic (Mg/Al-POM and Mg/Ga-POM) materials by a general route previously demonstrated only for basic LDH materials. In each case, H(2)W(12)O(40)(6)(-) or PW(11)O(39)(7)(-) pillared materials with significant BET surface areas were obtained. Stringent control over the M(…