Materials Literature
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ADVERTISEMENT RETURN TO ISSUEPREVCommunicationNEXTNoncovalent Formation of Polyglycine II-Type Structure by Hexagonal Self-Assembly of Linear Polymolecular ChainsToshimi Shimizu, Masaki Kogiso, and Mitsutoshi MasudaView Author Information Department of Organic Materials National Institute of Materials and Chemical Res…
An aqueous‐based system (Si‐Al 2 O 3 ‐Y 2 O 3 ‐Fe 2 O 3 ) for processing sintered reaction‐bonded silicon nitride (SRBSN) was investigated with an emphasis on chemical control of suspension component interactions. Chemical stability and dispersion properties of a commercial silicon powder were characterized using elec…
The high-temperature creep resistance in Al2 O3 is improved greatly by ZrO doping. Zirconium ions are found to be segregated in Al O grain boundaries. The activation energies for creep in high-purity Al2 O3 and ZrO-doped Al O are - estimated to be 430 and 650 kJ mol1, respectively. The grain boundary diffusivity of Al…
Liquid-liquid phase separation and crystallization (or solid-liquid phase separation) both occur in protein solutions. By adopting egg-white lysozyme for a model system, we compared two types of diagrams, a phase diagram of the liquid-liquid phase separation and a morphological diagram of protein crystals. By superimp…
In this paper we extend the dynamic mean-field density functional method, derived from the generalized time-dependent Ginzburg-Landau theory, to the mesoscopic dynamics of compressible polymer liquids. We discuss and compare different classes of compressibility models: exactly incompressible, the Helfand's harmonic pe…
We demonstrate thermoreversible gelation of a conductive polymer, i.e., rubber-like melt processible electrically conducting compounds. Combination of viscoelastic and electrical conductivity measurements suggests network formation in the gel state and gel melting at elevated temperatures. The gels have been prepared…
Reaction of the tris-chelating hexadentate podand ligand tris[3-(2-pyridyl)pyrazol-1-yl]hydroborate (Tp(Py)) with [Cu(MeCN)(4)][PF(6)] affords [Cu(I)(3)(Tp(Py))(2)][PF(6)] (1), which was crystallographically characterized. 1.(MeCN)(2): C(52)H(44)B(2)Cu(3)F(6)N(20)P, orthorhombic, Pna2(1); a = 24.592(7), b = 16.392(5),…
Molecule‐based magnets with high ordering temperatures T c (above room temperature) include some mixed‐oxide hexacyanometallates. The example studied here, Cr 2.12 (CN) 6 · ½ H 2 O (the Figure shows its crystalline and amorphous phases), is shown to have T c equals; 260 K and exhibit negative (reverse) magnetization.…
The new spin transition compound [Fe(II)(DPEA)(NCS)(2)], where DPEA [(2-aminoethyl)bis(2-pyridylmethyl)amine] is a new tetradentate ligand, has been synthesized, and its structure, magnetic properties, and Mössbauer spectra have been investigated. The crystal structure has been determined by X-ray diffraction at 298 K…
A Ru(II) complex ( Ru ) containing as ligands a tridentate 4‘-p-tolyl-2,2‘:6‘,2‘‘-terpyridine (ttpy) and a tridentate 2,6-bis(4‘-phenyl-2‘-quinolyl)pyridine (bpqpy) has been covalently linked to a porphyrin module ( PH 2 ) to obtain a PH 2 − Ru dyad. The corresponding PZn − Ru dyad has then been obtained by metalation…
We present a theory whose goal is to account for the recent exciting hysteresis experiments on the spin cluster crystal Mn 12 -acetate that indicate the occurrence of spin tunneling. We have found the tunneling probability P for the tunneling of spin from one spin state into another at a spin level crossing in respons…
We describe a synthetic method for the formation of surfactant-templated periodic mesoporous silica thin films. The films, when deposited between 0.22 < t/t gel < 0.67, are crack-free, consist of aggregated submicrometer particles, each of which contains the familiar honeycomb arrangement of 30−40 Å diameter channels,…
The effect of partial substitution on the hydrogen storage properties of Mg 2 Ni was investigated. It was found that as a result of substitution of Mg with a more electronegative element (Al or Mn), absorption of hydrogen easily occurs at lower temperature. The alloy powder prepared with a mechanical grinding method w…
We demonstrate how to construct dynamic phase diagrams for complex fluids that undergo transitions under flow, in which the conserved composition variable and the broken-symmetry order parameter (nematic, smectic, crystalline, etc.) are coupled to shear rate. Our construction relies on a selection criterion, the exist…
Biofiltration is a popular method for removing volatile organic compounds (VOCs). One promising medium for biofilters is biomass encapsulated gel beads. Like any other biodegradation system, oxygen concentration is an important factor affecting microbial activities in gel beads and thus the VOC removal efficiency. Thi…
High-performance composites were made of knitted fabrics using weft insertion. The stitch was formed by means of thermoplastic yarns (PA6 or PETP); the weft yarns were E-or S2-glass yarns. These fabrics were very flexible and well-suited to produce doubly curved components. Then eight layers of these fabrics were pres…
Fran Ertl; Procedure Modification of AOAC Official Method 962.17, Volatile Oil in Spices, Journal of AOAC INTERNATIONAL, Volume 80, Issue 4, 1 July 1997, Pages
Abstract The dilute‐solution behavior and liquid crystal formation of cellulose tris(3,5‐dimethylphenylcarbamate) (CTDC) in 1‐methyl‐2‐pyrrolidone (NMP) at 25°C are discussed by summarizing our recent studies, and its molecular characteristics are compared with those of cellulose tris(phenylcarbamate) (CTC) in the sam…
In this study a block oriented modelling technique was introduced in order to simulate the intermittent drying technology process. First, the relevant blocks of the parameters concerning to drying air and the properties of material to be dried were developed. These blocks were then used to set up the full modell of a…
Binary systems of ketones and aldehydes as proton acceptors with different donors were investigated. The existence of different hydrogen bonded liquid crystalline associates was proven by the induction of the smectic A phase as well as by IR-spectroscopic measurements.