Materials Literature
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Multiwalled BN nanotubes are grown from nickel boride catalyst particles by chemical vapor deposition at 1000−1100 °C using borazine, B3N3H6, as the precursor. This precursor is generated in situ from molten salt that forms from mixtures of (NH4)2SO4, NaBH4, and Co3O4 at 300−400 °C. The BN nanotubes have concentric-tu…
In this paper characterization of the biomechanical properties of human skin in vivo is studied both experimentally and by numerical modeling. These properties can be important in the evaluation of skin condition (e.g. aging) as well as skin disorders. Methods: In this study we focus on the static behavior of the derm…
[structure: see text] Host-guest complexes of a new open-ended cavitand show unprecedented stabilities. Simultaneous binding in the cavity and at the metalloporphyrin affects both the kinetics and the thermodynamics of caviplex formation.
Direct evidence of a new phase transition at T CO = 100.6 K in the organic quasi-one-dimensional (TMTTF) 2 AsF 6 salt has been obtained from conductivity and dielectric permittivity measurements. This phase transition is assigned to a charge-ordered state (4 k F charge density wave of Wigner type) due to charge-induce…
Low-field magnetic properties of ceramic La 1- x Ca x MnO 3 (0⩽ x ⩽0.4) are investigated between T = 5 and 310 K. The paramagnetic-ferromagnetic transition is observed in all the samples. The dependence of the Curie temperature, T C , on x is described within a model of spin polarons associated with electronic localiz…
Electrocrystallization of 1,1,2-trichloroethane solutions of the redox-active secondary amide, 3-methylamido-3‘,4‘-ethylenedithiotetrathiafulvalene (EDT-TTF-CONHMe 1 ) in the presence of n -Bu 4 NF supported on silica gel afforded a mixed-valence chloride salt, formulated ( 1 ) 2 [Cl·H 2 O] from elemental analysis and…
Poly(ethylene oxide) (PEO)/poly(methyl methacrylate) (PMMA) blends were prepared by casting from either chloroform or benzene solvents. After casting from solvents, all samples used in this study were preheated to 100°C and held for 10 min. Then, the solvent effect on the crystallization behavior and thermodynamic pro…
Styrene–butadiene latexes were prepared in the absence of an emulsifier using a redox initiator Fe(NO3)3/H2O2. Their positive charge was supplied by comonomer N,N-diethyl aminoethyl methacrylate. At a given styrene–butadiene ratio (60/40) the particle size depends on the concentration of the comonomer and initiator. T…
The transition between nanometre-scaled diamond and graphite as well as the corresponding thermodynamic functions are discussed based on the temperature-pressure phase diagram of carbon including the contribution due to surface effects. As a result, the equilibrium transition size between diamond and graphite as a fun…
The Tool−Narayanaswamy−Moynihan (TNM) equation for the temperature ( T ) and fictive temperature ( T f ) dependence of the relaxation time in glassy materials is compared with the usual nonlinear form of the Adam−Gibbs (AG) equation. It is shown that the relationship derived between the Narayanaswamy parameter x and t…
The coefficient of thermal expansion of the Si-O bond has been obtained from neutron total scattering measurements of five different phases of silica, with value (2.2±0.4) × 10 -6 K -1 . This value is smaller than values obtained by conventional x-ray diffraction measurements corrected for rigid-body thermal motion. T…
A segregated feed model linked to the population balance, which includes micromixing and mesomixing effects together with crystallization and agglomeration kinetics, is proposed for scaling up reactive precipitation processes. The model is solved using kinetic parameters extracted from laboratory-scale experiments tog…
The UV-laser (308 nm)-induced decomposition and ablation of polyimide (Kapton) was studied using diffuse reflectance infrared Fourier transform (DRIFT) spectroscopy. The samples were prepared with a special technique (SiC substrates) allowing analysis of surface species of the laser-treated polymer. The first step of…
Polyimide–silica (PI–SiO2) hybrids with a nanostructure was obtained using the nonaqueous sol–gel process by polycondensation of phenyltriethoxysilane in a polyamic acid solution. Self-catalyzed hydrolysis of phenyl-substituted akoxysilane and modification on the polyimide structure are applied and result in highly co…
We have performed an ab initio investigation for a series of boron compounds, BP, BAs, and BSb, and have compared their structural and electronic properties with those of c-BN. The calculations are performed using a plane-wave expansion within the local density approximation and the pseudopotential approximation. Resu…
The linear trinuclear compound Co 3 (dpa) 4 Cl 2 ( 1; dpa = di(2-pyridyl)amide anion) crystallizes from CH 2 Cl 2 solution in two forms simultaneously, namely, an orthorhombic form 1 ·CH 2 Cl 2 and a tetragonal form 1 ·2CH 2 Cl 2 . The three linearly arranged cobalt atoms in 1 are supported by four dpa ligands in a sp…
In this study, chitosan microspheres and sponges were prepared and characterized for diverse biomedical applications successfully. The chitosan microspheres were obtained with a “suspension crosslinking technique” in the size range of 30–700 μm. The stirring rate of the suspension medium and the chitosan/acetic acid r…
Dimensional stability of fiber board from lignocellulosic materials is a prime concern for efficient utility of the product. A number of methods have been used to improve the dimensional stability. These include the application of coating, oil, and wax treatments and chemical modification of lignocellulosic materials.…
We present a theoretical model of the "isostructural" γ-αphase transition in Ce which is based on quadrupolar interactions due to coupled charge density fluctuations of 4f electrons and of conduction electrons. Conduction electrons are treated in tight-binding approximation. The γ-αtransition is described as an orient…
Thin films of Pr0.7Ca 0.3MnO3, Nd-0.5Ca0.5MnO3 and Nd0.5Sr0.5MnO3 have been fabricated. by pulse laser deposition. Magnetic and electrical transport properties of these films were compared with their bulk solids. All the films grow in (101) direction on LaAlO3(100). Electrical transport measurements carried out with a…