Materials Literature
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Despite intensive research on the encapsulation of metal nanoparticles into carbon clusters deposited by arc discharge, the detailed pathways of the formation of these novel forms of materials remain unclear. The growth of a rich variety of morphologies is not well understood. Studies are reported here on the growth p…
We characterize the time dependence of the frequency-dependent dielectric susceptibility of glycerol following quenches to low temperature. For quenches to temperatures not far below the glass-transition temperature, the spectral shape and position during equilibration closely approximate those of equilibrium spectra…
Bone marrow stromal cells, progenitor cells involved in repair of bone and cartilage, can potentially provide a source for autologous skeletal tissue engineering. We investigated which factors were required to induce in vitro differentiation of avian bone marrow stromal cells into three-dimensional cartilaginous and b…
The synthesis and reactivity of a wide range of titanium benzamidinates is described. Addition of 0.5 equiv of Me 2 Mg to the dichloride L 2 TiCl 2 (L = PhC(NSiMe 3 ) 2 ) in Et 2 O yields the chloro−alkyl derivative L 2 Ti(Me)Cl in good yield. The addition of 2 equiv of PhCH 2 MgCl to the dichloride affords thermally…
Spider minor ampullate silk is a strong non-elastic deformably stretchable silk used in web formation. This silk from Nephila clavipes is composed of two proteins, MiSp 1 and 2, whose transcripts are 9.5 and 7.5 kb, respectively, as determined by Northern blots. Both MiSp proteins are organized into a predominantly re…
Surface-sensitive and polarization-dependent near-edge X-ray absorption fine structure (NEXAFS) measurements clearly reveal a preferred in-plane and out-of-plane orientation of phenyl and C O groups at the surface of rubbed polyimide films. The unidirectional molecular alignment at the surface is argued to provide the…
We have done molecular-dynamics simulations of ${\mathrm{Fe}}_{1\ensuremath{-}x}{\mathrm{Ni}}_{x}$ employing a semiempirical model. We present a phase diagram of the martensite-austenite transition temperatures as a function of the Ni concentration which is in good agreement with experimental observations. In addition…
The templated synthesis of mesoporous materials using surfactant templates has been known since 1992. The discovery reported here, that non-surfactant organic molecules, e.g., optically active organic compounds such as D-glucose, also act as templates for the formation of mesoporous silica materials with large surface…
Silane pretreatments were investigated as environmentally friendly replacements for the existing chromating processes. The objective was to compare the corrosion protection properties of various silanes. The corrosion inhibiting action of silane films on iron was examined in 3% sodium chloride (NaCl) solutions. Coatin…
The films of random copolymers of ( R )-3-hydroxybutyric acid with different hydroxyalkanoic acids such as ( R )-3-hydroxypentanoic acid, ( R )-3-hydroxyhexanoic acid, 4-hydroxybutyric acid, 6-hydroxyhexanoic acid, and ( S, S )-lactide were prepared by the melt-crystallized method at various crystallization temperatur…
The principles of crystal engineering have been used to design a family of structures with potential as octupolar nonlinear optical (NLO) materials. The major aim in such an exercise, a carry-over of molecular symmetry into the crystal, is possible with a retrosynthetic approach. An appropriate choice of precursor tri…
The structure of thallium dicyanoargentate(I) has been determined crystallographically. The crystal structure shows an Ag-Ag distance of 3.11 Å. This is the shortest Ag-Ag distance reported for any silver dicyanide salt whose crystal structure has been determined. Raman spectra of the compound show four nu(C)(-)(N) pe…
We have investigated the magnetic-field-induced phase transitions of ${R}_{1\ensuremath{-}x}{\mathrm{Ca}}_{x}{\mathrm{MnO}}_{3}$ ($R=\mathrm{Pr}$ and Nd, $x=0.50,$ 0.45 and 0.50, 0.45, 0.40) by measurements of magnetization, magnetoresistance, and magnetostriction utilizing a nondestructive long-pulse magnet (generati…
In open atmosphere the two phases containing fluorine, C11A7∙CaF2 and 3CA∙CaF2, laying in the CaO-CaO∙Al2O3-CaF2 were synthesized. The synthesis of the 3CA∙CaF2 at 1.100°C was possible without loss of F, when the stoichiometric mixture of CA and CaF2 was pressed into tablets and was applied vacuum, avoiding in such a…
We evaluated the efficacy of two water-repellents applied to three types of granitic rock widely used in building construction and restoration in Galicia (NW Spain). The depth of penetration of the water-repellents was determined by measuring capillary absorption by the treated rock. The efficacies of the water-repell…
Criteria about concrete Strength Resistance of DRILLED STANDARDIZED specimens have been considered and occasionally explained by several authors in some of their work, but there is no publication devoted to the full extent of the subject,, reason why we are trying to put together results/ideas, expose them, and briefl…
Solid state synthesis associated to X-ray diffraction and free lime analysis have been carried out to determine proper conditions (chemical compositions, optimum time and temperature of burning) under which phosphatic belitic clinker is elaborated. Raw meals, at low lime saturation factor and added phosphate, can form…