Materials Literature
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The orientation behavior of liquid crystal networks having the Sm C A structure stabilized by H-bonds has been studied. The mesogenic groups formed by hydrogen bonds generate a layered structure of the polymer. The hydrogen bonds are responsible for the elastic properties of the liquid crystal polymer network and the…
ADVERTISEMENT RETURN TO ISSUEPREVCommunication to the...Communication to the EditorNEXTInfrared Bands Sensitive to the Chain Packing Mode in the Crystalline δ, δe, and γ Forms of Syndiotactic PolystyreneAkiko Yoshioka and Kohji TashiroView Author Information Department of Macromolecular Science, Graduate School of Sci…
Electron-beam-stimulated deposition and etching has been investigated as a clean, alternative method for nanoscale selective processing. Depositions using W(CO)6 and hydrocarbon sources have yielded efficient and selective electron-beam deposits. Primarily fluorine-based precursors have been used to etch a variety of…
The dynamics of weld solidification were observed in situ using a laser welding process on transparent organic materials systems. Succinonitrile was used to simulate a pure metal system and succinonitrile with 1.2 wt. % acetone was used to simulate an alloy system. Observed weld pool shapes in succinonitrile were in g…
Metallic zinc nanowires are synthesized by evaporating ZnO powder mixed with graphite in an NH3 flowing carrying gas environment. The majority of the as-synthesized zinc nanowires are single crystalline and free from structural defects, whereas a small portion of the nanowires consists of single-crystalline Zn nanorod…
Neutron reflectivity was used to characterize the structure of end-grafted deuterated poly(dimethylsiloxane) ( d- PDMS) brushes on SiO x wafers exposed to liquid and supercritical carbon dioxide (CO 2 ). The solvent quality was tuned continuously over a large range from ideal gas conditions to a near-ϑ solvent by vary…
Unexpectedly high-longitudinal piezoelectric coefficients have recently been reported in c-axis oriented Pb(Zr,Ti)O3 thin films with morphotropic phase boundary composition [Fu et al., Appl. Phys. Lett. 80, 3572 (2002)]. Our analysis and experimental results show that, in comparison with other methods commonly used to…
From the water - methanol solution of Cu(II) - LN - [Ni(CN)4]2- (1:2:1) (LN = N, N-dimethylethylenediamine (dmen); N,N'-dimethylethylenediamine (bmen); N,N,N',N'-tetramethylethylenediamine (tmen) ) were isolated three new compounds: Cu(dmen)2Ni(CN)4 (CDNC), Cu(bmen)2Ni(CN)4 (CBNC) and Cu(tmen)Ni(CN)4 (CTNC). The resul…
Eight poly(aryl) ether dendritic wedges attached to the periphery of a phthalocyanine significantly decreases self-association of these chromophores in solution and the condensed state.
Intercalation of methylene blue into K 4 Nb 6 O 17 single crystals was investigated for the construction of hybrid materials with three-dimensional anisotropy. By the reaction of K 4 Nb 6 O 17 with a methylene blue aqueous solution in the presence of propylamine, methylene blue/K 4 Nb 6 O 17 intercalation compounds we…
Abstract We highlight the self‐similar features of the frequency‐dependent (absolute) reflection coefficient of a dielectric Cantor prefractal obtained by applying the well‐known Cantor‐set construction to the optical (rather than physical) layer lengths. The referred properties are first obtained using an exact chara…
Pretilt angle measurable by using the conventional crystal rotation method is limited to about 0°–20° and 70°–90°. We propose a method by which we can measure the pretilt angle by using the crystal rotation method even if the pretilt angle is between 20° and 70°. In this method, the determination of a pretilt angle is…
We numerically study a nondisordered lattice spin system with a first order liquid–crystal transition, as a model for supercooled liquids and glasses. Below the melting temperature the system can be kept in the metastable liquid phase, and it displays a dynamic phenomenology analogous to fragile supercooled liquids, w…
The electronic structures and interface properties of the TiO2/Cu2S interface have been in situ studied after each growth step by x-ray and ultraviolet photoelectron spectroscopy. The p-doped Cu2S films (BEVBM=0.1 eV) were grown on the highly n-doped chemical vapor deposition prepared TiO2 (BEVBM=3.4 eV) films by ther…
We show that the near surface structure of lamellar ABC triblock copolymer mesostructures can deviate considerably from the “ideal” surface anticipated from the bulk structure of the material. Varying the molecular architecture and the surface energy difference between the respective blocks, we show that such surface…
Abstract The influence of the electron beam modification of a dual‐phase filler on the dynamic mechanical properties of styrene‐butadiene rubber (SBR) is investigated in the presence and absence of trimethylol propane triacrylate or triethoxysilylpropyltetrasulfide. Electron beam modification of the filler results in…
The hexagonally perforated layer (HPL) phase in a polystyrene- b -poly(ethylene oxide) (PS- b -PEO) diblock copolymer was systematically studied by small-angle X-ray scattering (SAXS) in reciprocal space and transmission electron microscopy (TEM) in real space. Detailed crystallographic analyses revealed that the shea…
Negative index of refraction materials have been postulated for many years but have only recently been realized in practice. In the microwave region these materials are constructed of rings and wires deposited on a dielectric substrate to form a unit cell. We have constructed, experimentally characterized, and simulat…
Ferromagnetic behavior of GaN doped with Mn (Ga1−zMnzN) grown by the ammonothermal and chemical transport methods is discussed in terms of a second phase (ferromagnetic one) produced during the growth process. The reference manganese nitride samples grown by the same method as (Ga,Mn)N reveal room-temperature ferromag…
The electronic structure and structural stability of the technologically interesting material NaAlH4 are studied using an ab initio projected augmented plane-wave method for different possible structure modifications. We predict that α-NaAlH4 converts to β-NaAlH4 at 6.43 GPa with a 4 % volume contraction. Both modific…