Materials Literature
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Abstract Our earlier paper (Jana, S.C.; Prieto, A. J Appl Polym Sci 2002, 86, 2159) on the development of natural fiber composites of high‐performance thermoplastic polymers described a new methodology for the manufacturing of composite materials of a high‐temperature thermoplastic polymer, poly(phenylene ether) (PPE)…
Although ATP is the most common phosphoryl group donor for kinases, some kinases from certain hyperthermophilic archaea such as Pyrococcus horikoshii and Thermococcus litoralis use ADP as the phosphoryl donor. Those are ADP-dependent glucokinases (ADPGK) and phosphofructokinases in their glycolytic pathway. Here, we s…
X-ray photoelectron spectroscopy (XPS) is used to probe the nanostructure of shell cross-linked micelles in the solid state. A novel ABC triblock copolymer was synthesized via atom transfer radical polymerization (ATRP) comprising quaternized nitrogen atoms in the relatively hydrophilic “A” block, cross-linkable hydro…
The formation of closed-compact multilamellar vesicles (referred to in the literature as the ``onion texture'') obtained upon shearing lamellar phases is studied using small-angle light scattering and cross-polarized microscopy. By varying the shear rate $\stackrel{\ifmmode \dot{}\else \textperiodcentered \fi{}}{\ensu…
Abstract A series of polyisophthalamides containing pendent phthalimido groups and flexible side spacers were prepared from four novel diacids and three commercial aromatic diamines. These polyamides were prepared in high yields and with high molecular weights by direct polycondensation with triphenyl phosphite and py…
Cyanide-bridged molecular squares of [Fe(II)(2)Cu(II)(2)(mu-CN)(4)(dmbpy)(4)(impy)(2)](ClO(4))(4).4CH(3)OH.C(6)H(6) (1) and of [Fe(III)(2)Cu(II)(2)(mu-CN)(4)(dmbpy)(4)(impy)(2)](ClO(4))(6).4CH(3)OH.4H(2)O (2) (dmbpy = 4,4'-dimethyl-2,2'-bipyridine; impy = 2-(2-pyridyl)-4,4,5,5-tetramethyl-4,5-dihydro-1H-imidazolyl-1-o…
Preparation of methylpseudoionones (precursors of methylionones) has been carried out by aldol condensation between citral and methyl ethyl ketone (Mek) using an amorphous aluminophosphate (ALPO), KF–Alumina and differently activated Al-Mg hydrotalcites as solid base catalysts. Activated hydrotalcites (calcined or cal…
Abstract Pyromellitic dianhydride (benzene‐1,2,4,5‐tetracarboxylic dianhydride) (1) was reacted with L ‐phenylalanine (2) in a mixture of acetic acid and pyridine (3 : 2) and the resulting imide‐acid [ N,N′ ‐(pyromellitoyl)‐bis‐ L ‐phenylalanine diacid] (4) was obtained in quantitative yield. The compound (4) was conv…
Abstract Different solvents used to determine the intrinsic viscosity and the viscometic constants, a and K , published in the literature for cellulose, were compared. The various parameters affecting the viscometric constants were also evaluated. The main conclusions obtained from the experimental data available in t…
The co-condensation of a tetraethoxysilane molecule on a neutral n-octylamine surfactant template is a convenient synthetic methodology for mesostructured material preparations. Distinct routes of template removal were investigated. The neutral surfactant was removed by calcination, hot solvent extraction, heating at…
Numerical self-consistent field (SCF) theory is used to study the equilibrium segregation of A/B gradient copolymers to the interface between immiscible A and B homopolymers. A generalized SCF theory is developed that allows arbitrary composition gradients to be investigated. The focus of this paper is on symmetric co…
Lanthanide complexes with the Schiff base axial macrobicyclic ligand L(1) react with Zn(II) nitrate in the presence of CaH(2) to yield Ln(III)-Zn(II) heterodinuclear cryptates with the formula [Ln(NO(3))(L(1)-3H)Zn](NO(3)).xH(2)O.yMeOH. The macrobicyclic receptor L(1) is an azacryptand N[(CH(2))(2)N=CH-R-CH=N-(CH(2))(…
The self-assembly of 5,10,15,20-tetra(4-pyridyl)-21H,23H-porphine (TPyP) on Au(111) electrodes was investigated. The adlayer structure was found to depend on the electrode potential. At positive potentials (>0.5V(SCE)), a disordered layer of TPyP is formed on the Au(111) electrode. STM images showed that the disordere…
The coordination−insertion ring-opening polymerization of ε-caprolactone was initiated from amine or hydroxyl groups spread over the surface of silica (ca. 30 nm) or cadmium sulfide (ca. 1.5 nm) nanoparticles, respectively. The initiation selectively occurred from the surface functional groups after activation into al…
The structure and chemistry of the $a[100]$ edge-dislocation core in ${\mathrm{SrTiO}}_{3}$ was investigated by high-resolution transmission electron microscopy and electron-energy-loss spectroscopy. The dislocation core is found to be compact, with only a slight dissociation on the {100} plane. This indicates that th…
Abstract The effect of nucleating agents on the crystallization behavior of poly(3‐hydroxybutyrate‐co‐3‐hydroxyvalerate) (PHBV) was studied. A differential scanning calorimeter was used to monitor the energy of the crystallization process from the melt and melting behavior. During the crystallization process from the…
The mechanical stability of SBA-15 mesoporous silicas has been assessed using powder X-ray diffraction; nitrogen, benzene, and n -heptane adsorption; and mercury porosimetry. SBA-15 was found to possess rather low mechanical stability as compared to other mesoporous materials, viz., MCM-41 and MCM-48. These results ca…
PREFACE.I: BASIC THERMODYNAMICS.1. Energy and the First Law of Thermodynamics.1.1. Fundamental Concepts.1.2. The First Law of Thermodynamics.1.3. The Enthalpy.2. The Entropy Concept.2.1. The Entropy Defined.2.2. The Second Law of Thermodynamics.2.3. Applications of the Entropy Concept.3. The Free Energy.3.1. Propertie…
Magnetic properties of high-quality Al-free nonsuperconducting GdBa_2Cu_3O_{6+y} single crystals grown by flux method have been studied. The magnetic anisotropy below the Néel temperature T_N~2.3K corresponds to the direction of Gd^{3+} magnetic moments along the tetragonal c-axis. At T < T_N clear indications of spin…
Quasicrystals can carry, in addition to the classical phonon displacement field, a phason displacement field, which requires a generalized theory of elasticity. In this paper, the third-order strain invariants (including phason strain) of icosahedral quasicrystals are determined. They are connected with 20 independent…