Materials Literature
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Amorphous fluorocarbon polymer films (a-C:F) have been grown by plasma enhanced chemical vapor deposition from a new precursor, namely perfluoro-octane (C8F18) vapor. The dielectric and insulating properties of the films have been assessed by means of capacitance–voltage and current–voltage characteristics, breakdown…
Abstract Summary: The polymerization and copolymerization of 3( S )‐isopropylmorpholine‐2,5‐dione (IPMD) and D , L ‐lactide (DLLA) were carried out in the presence of Porcine pancreatic lipase type II (PPL) as a catalyst at 100 °C for 168 h. Homopolymers and random copolymers of various compositions were obtained with…
N-Propargylamide-terminated peptide-based macromonomers with a degree of polymerization ranging from 4 to 40 were synthesized by the polymerization of gamma-benzyl and gamma-stearyl-L-glutamate-N-carboxy anhydrides initiated with propargylamine. The macromonomers took an alpha-helical structure, which was confirmed by…
Polycarbonate membranes with one pore only are created by the track-etching technique. The shape and size of the pore are determined by the type of etchant as well as by the temperature and etching time. The dynamics of single-pore formation during etching is investigated to determine the breakthrough time and the tra…
Abstract The physicochemical and electrocatalytic behaviors of eight multi‐iron Wells−Dawson sandwich‐type polyoxometalates were studied with specific emphasis on the Fe III centers. Magnetization measurements were used to identify and quantify the antiferromagnetic interactions between the edge‐sharing Fe III units.…
Abstract Summary: Poly( ε ‐caprolactone)‐polyglycolide‐poly(ethylene glycol) monomethyl ether random copolymers were synthesized from ε ‐caprolactone ( ε ‐CL), glycolide (GA) and poly(ethylene glycol) monomethyl ether (MPEG) using stannous octoate as catalyst at 160 °C by bulk polymerization. The copolymers with diffe…
Abstract In response to growing environmental concerns, we attempted to develop switchgear without using SF 6 gas. In our research, we used compressed air and pure N 2 as an electrical insulation gas, because of their low global warming potential. In this paper, we examined the impulse breakdown and impulse partial di…
Abstract The d 5 high‐spin Mn II half‐sandwich complexes [Mn(C≡CR)(MeC 5 H 4 )(tmeda)] (R = SiMe 3 2 ; Ph 3 ; t Bu 4 ; C≡CSiMe 3 5 ; C≡CPh 6 ; tmeda = N , N , N′ , N′ ‐tetramethylethylenediamine) were prepared by the reaction of [Mn(MeC 5 H 4 ) 2 (tmeda)] ( 1 ) with 1 equiv. of the corresponding acetylene or the trime…
Solubilities of seven imidazoles (1 H- imidazole, 2-methyl-1 H- imidazole, benzimidazole, 2-methylbenzimidazole, 2-phenylimidazole, 4,5-diphenylimidazole, and 2,4,5-triphenylimidazole) in organic solvents (dichloromethane, 1-chlorobutane, toluene, and 2-nitrotoluene) have been measured using a synthetic method and liq…
Bombyx mori silk fibroin fiber is a fibrous protein produced by the silkworm at room temperature and from an aqueous solution whose primary structure is highly repetitive. In this study we analyzed the structural characteristics of native peptides, derived from B. mori silk fibroin, with formic acid treatment using hi…
Protein crystallization is a subject in which the commonplace “more an art than a science” still survives, and in which crystallization and crystallography are still synonyms. One of the major hindrances has been the lack of thermodynamic and kinetic parameters required for efficient crystallization design. In this ar…
The aggregation rate was determined for the < 0.2 microm size fraction of kaolinite (KGa-2) using simultaneous static and dynamic light scattering at pH 9.5. It was found that method suggested by Holthoff et al. [Langmuir 1996, 12, 5541] is suitable for determination of the absolute aggregation rate constant of a clay…
Thermally stable materials with low dielectric constant ( k <3.9) are being hotly pursued. They are essential as interlayer dielectrics/intermetal dielectrics in integrated circuit technology, which reduces parasitic capacitance and decreases the RC time constant. Most of the currently employed materials are based on…
A specimen-based macroscopic constitutive model of shape memory alloys for unidirectional loading, which is simple yet accurate and has a physical background, was derived from a grain-based microscopic model. To consider the inner hysteresis loops of a stress?strain?temperature relationship, a new inner loop model cal…
Numerous bacteria and mammalian cells harbor two enzymes, phosphopentomutase (PPM) and 2-deoxyribose 5-phosphate aldolase (DERA), involved in the interconversion between nucleosides and central carbon metabolism. In this study, we have examined the presence of this metabolic link in the hyperthermophilic archaeon, The…
Abstract Polysilsesquioxanes were prepared through the acid‐catalyzed hydrolytic polycondensation of triethoxy(methyl)silane, triisopropoxy(methyl)silane, or triisobutoxy(methyl)silane and subjected to dip coating to form coating films. The film formation depended on the polarity and crystallinity of the substrate, an…
An electrochemical sensor design for selective NO detection is presented based on a polyoxometalate (POM) cluster immobilized on an electrode through a polyelectrolyte matrix. It is suggested that the POM can electrocatalyze the reduction of NO. The reduction current is proportional to the NO concentration in the inve…
We theoretically investigate the photonic band structure of one-dimensional superlattices composed of alternating layers of right-handed and left-handed materials (RHM and LHM). The dispersion curves are mainly studied by assuming that the dielectric permittivity and magnetic permeability are constant in each layer. I…
Abstract Summary: In this present study, the in situ fabrication of a microfibrillar composite based on poly(ethylene terephthalate) (PET), polyethylene (PE), and carbon black (CB) is attempted. PET and CB were first melt mixed. The CB/PET compound and PE were subsequently melt extruded through a slit die and then hot…
Density-functional calculations have been performed to investigate the mechanism of dehydroxylation in both cis- and trans -vacant pyrophyllite. In agreement with predictions from experiment, calculations show that both form a trans -vacant dehydroxylated structure, with aluminum in trigonal-bipyramidal coordination a…