Materials Literature
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This paper discusses the optimization of the solvent evaporation process to produce double-walled (DW) microspheres in a single-step. Five process variables were studied: polymer solution concentration, polymer weight ratio, polymer solution volume ratios, encapsulation temperature, and air flow rate across the top of…
Hybrid materials made from polydimethylsiloxane and zirconium oxo species have been synthesized. They exhibit a high degree of homogeneity and dispersion for Zr/Si molar ratios ranging between 0.2 and 0.9. These hybrid materials show good mechanical integrity and transparency. They have been characterized by 29 Si, 17…
T. L. Morkved, B. R. Chapman, F. S. Bates, T. P. Lodge, P. Stepanek and K. Almdal, Faraday Discuss., 1999, 112, 335 DOI: 10.1039/A809169B
The synthesis of novel dendrimers with various functional cores, including those of the porphyrin macrocycle, has been a very active area of research. Phthalcyanine (Pc), a close relative of porphyrin, and its derivatives form one of the most studied classes of functional organic materials. The author briefly summariz…
films have been grown by laser ablation on (100) oriented Si and GaAs substrates. Optimal growth of was obtained at a substrate temperature of 450 C in a molecular oxygen atmosphere of Torr. X-ray measurements show these films to be (111) oriented, with the growth direction random in the plane of the film. The introdu…
Two strategies have been employed in the construction of multiporphyrin arrays; the principles are illustrated by a seven-porphyrin array consisting of two three-porphyrin dendrons coordinated to a single ruthenium(II) porphyrin, and by a six-porphyrin array containing three ruthenium(II) porphyrinmonomers coordinated…
Silica-supported rare earth oxide catalysts (Ln/SiO2; Ln=La, Ce, Pr, Sm, Eu, Tb, Yb and Y), loading amounts of which were 3.4 mmol g (support)-1, were characterized by α-pinene isomerization, temperature-programmed desorption (TPD), Fourier transform infrared (FTIR), X-ray diffraction (XRD), X-ray absorption fine stru…
The initial energy deposition stage of the thermoluminescent (TL) process is investigated. A coupled ion-electron Monte Carlo (MC) transport code developed for LiF considering its solid-state nature is used to obtain radial dose distributions for incident proton and helium ions at several energies. Models which relate…
A remarkable co-crystallization in which two neutral clusters, Ag8(Se)[Se2P(OPri)2]6 and Ag6[Se2P(OPri)2]6, superimpose along the three-fold axis in the trigonal lattice and share a common Ag6[Se2P(OPri)2]6 unit, is reported.
A lyotropic lithium triflate-silicate liquid crystal is utilized as a supramolecular template for a ‘one-pot’ synthesis of a novel ionically conducting nanocomposite material, denoted meso-SiO 2 -C 12 (EO) 10 OH-LiCF 3 SO 3 , in the form of a film or monolith. In this structure Li + ions interact, in a crown ether-lik…
An odd–even effect is observed in the CD spectra of a homologous series of aggregated optically active poly(3,4-dialkoxythiophene)s, suggesting a helical packing of polymer chains into chiral superstructures, similar to that of the cholesteric liquid crystalline phase.
The microscopic short time dynamics of glass-forming materials seen by quasielastic neutron scattering, dynamic light scattering, high frequency dielectric relaxation and molecular dynamics simulation in the picosecond region show the existence of the primitive relaxation, , for , where is the cross-over time of the c…
Density functional theory (DFT) is used to study model ferryl species of cytochrome P-450 and horseradish peroxidase (HRP), as well as of the product complex due to oxidation of H2 by the P-450 species (1–4 and 7). The ferryl species studied include neutral and cation radical states of the porphyrin, as well as high-…
Poly(ortho esters) based on 3,9-diethylidene-2,4,8,10-tetraoxaspiro[5.5]undecane, 1,10-decanediol, and 1,10-decanediol dilactate were prepared and their hydrolysis in phosphate buffer at 37 °C and pH 7.4 was determined as a function of time. Specifically, kinetics of polymer weight loss, polymer molecular weight chang…
In this paper, we discuss the utility of thin film deposition as a synthetic approach to the realization of new oxide materials. Thin film deposition has been shown previously to be well suited to stabilizing both highly metastable phases and superlattices having unique atomic order which are not attainable via classi…
Grafted adsorbing polymers are investigated with the Scheutjens−Fleer self-consistent field model. The surface pressure of such systems is calculated numerically and semiquantitative agreement is found with experimental surface pressure isotherms of PS−PEO diblock copolymers at the air/water interface. Scaling relatio…
Two equilibrium intermediates have previously been observed in the urea denaturation of the alpha subunit of tryptophan synthase (alphaTS) from Escherichia coli, an eight-stranded beta/alpha barrel protein. In the current study, a series of amino-terminal fragments were characterized to probe the elementary folding un…
Polyphenylene dendrimers and dendrons can be obtained using [2 + 4]cycloaddition and Knoevenagel cyclocondensation in a convergent approach.
The effect of fatigue on the electrical properties of sol-gel derived ferroelectric barium titanate (BaTiO3) thin films have been investigated. At room temperature, the resistivity, breakdown field, dielectric constant (ε), and loss tangent (tan δ) decreases after fatigue while the coercive field increases. Fatigue al…
The electron spin density distribution at hydrogen atoms of 4-hydroxyimino-2,2,6,6-tetramethylpiperidin-1-yloxyl (4-hydroxyimino-TEMPO), which has recently been shown to act as a molecular ferromagnet at low temperature, was determined in the crystalline phase on the basis of the temperature dependence of the Fermi co…