Formation and Decomposition Kinetic Studies of Calcium Zincate in 20 w / o KOH
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Effect of quenching temperature on the structure of isotactic polypropylene films
Films of isotactic polypropylene (iPP) were quenched at different temperatures. Wide-angle x-ray diffractograms for these samples show the presence of the smectic form of iPP at low quenching temperatures and the appearance of mono-clinic form on increasing the thickness of the substrate and the quenching temperature.…
Comparison of Phosphosilicate Glass Films Deposited by Three Different Chemical Vapor Deposition Methods
Properties of phosphosilicate glass (PSG) films deposited by the plasma chemical vapor deposition (CVD), low‐pressure CVD, and atmospheric CVD methods are compared. Stress behavior of plasma PSG films is almost the same as that of low‐pressure PSG films. The stress values change from compressive to tensile with increa…
Collagen at interfaces I. In situ collagen adsorption at solution/air and solution/polymer interfaces
Collagen was isolated from rat tail tendons and acetylated with 1-14C acetic anhydride. In situ adsorption of this collagen from a buffer solution (pH = 2.7) was measured at the interfaces to air, polyethylene and polyethylene grafted with poly(maleic acid), respectively. The kinetics of adsorption were recorded for a…
Collagen fibrillogenesis in the presence of lanthanides.
Following removal of most of the telopeptide regions with pepsin, bovine dermal collagen gelled more slowly to form fibrils with a weak banding pattern. The reduction in gelling rate reflected an increase in the length of the nucleation phase and a lower rate of turbidity increase during the growth phase; the activati…
A Chemical Decontamination Process for Decontaminating and Decommissioning Nuclear Reactors
Five chemical decontamination processes have been developed for nuclear reactor applications. One of these processes is the cerium decontamination process (CDP). This method uses a cerium acid reagent to rapidly decontaminate surfaces, obtaining decontamination factors in excess of 300 in 6 h on pressurized water reac…
Monocrystal elastic constants of NbC
Using ultrasonic methods at ambient temperatures, for niobium carbide we determined the monocrystalline elastic stiffnesses: C11, C12, and C44 in Voigt’s contracted notation. From these, we calculated the quasi-isotropic (polycrystalline) elastic constants and the elastic Debye characteristic temperature. Results deri…
Ion implantation effects in alkali-borosilicate glasses
Complex alkali-borosilicate glasses are being studied, and used, as media for radioactive waste encapsulation. The effects of radiation from α-decay processes on the physical properties of such glasses is of interest. The energy deposited in the glass by such decay processes can be simulated by ion implantation. We ha…
Phylogenetic relationships and classification of monoraphid diatoms based on phenetic and cladistic methodologies
A review of previously published hypotheses concerning phylogenetic relationships in the diatom family Achnanthaceae is presented. Data for characters such as valve ultrastructure, chloroplast number and morphology, and sexual reproduction for the genera Cocconeis, Achnanthes and Rhoicosphenia and their purported bira…
Influence of hydrophobic particles on the foaming of aqueous surfactant solutions
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTInfluence of hydrophobic particles on the foaming of aqueous surfactant solutionsMichael P. AronsonCite this: Langmuir 1986, 2, 5, 653–659Publication Date (Print):September 1, 1986Publication History Published online1 May 2002Published inissue 1 September 1986https://pubs.ac…
Kinetics of Ion Exchange on Clay Minerals and Soil: II. Elucidation of Rate‐limiting Steps
Abstract Kinetics of K + adsorption were investigated on kaolinite, a Chester loam soil and vermiculite using static, stirred, and vortex batch techniques. The objective of this study was to elucidate the rate‐limiting steps for K + adsorption on the clay minerals and soil. We hypothesized that it is possible under la…
Annealing of the β‐modification of polypropylene
Abstract Expressive memory effect has been proven in the course of the annealing of the β‐modification of polypropylene (β‐PP). The character of the structural changes taking place in β‐PP during annealing strongly depends on the thermal history. In dependence on the thermal history βα or ββ‐recrystallization takes pl…
On the nature of bleaching of amorphous Ge30S70 films
The irreversible photobleaching of amorphous Ge30S70 films is found to depend on the air pressure during exposure. This is most probably a result of photo-oxidation and/or hydrolysis of the layers. The appearance of a Ge-O-Ge vibrational band in the infrared transmission spectra of exposed layers clearly indicates the…
Histochemical and ultrastructural evidence for the function of the labiate process in the movement of centric diatoms
Movement in a centric diatom, Actinocyclus subtilis, is reported here for the first time. The movement is directional and strong circumstantial evidence from histochemistry and electron microscopy supports the proposal that motility is achieved by the production of mucopolysaccharides through the labiate processes.
Differential Cross-Sections for One- and Two-Electron Capture by Highly Charged Ions (N 7+ , O 7+ , O 8+ , Ne 7+ , Ne 8+ ) at Low keV Energies
This letter reports the first measurements of differential cross-sections (DCS) for one- and two-electron capture by highly charged ions at low keV energies. These measurements have been achieved using a new type of spectrometer with a design based on a two-dimensional position-sensitive detector. A comparison of the…
Dilation of polyethylene by sorption of carbon dioxide
Abstract The dilation of low‐density polyethylene accompanied by the sorption of CO 2 was measured by microscopy under pressures up to 50 atm at temperatures from 25 to 55°C. The dilatometry measurement, which is also applied to the determination of the thermal expansion coefficient, is directly performed by a catheto…
Some Effects of Structure, Composition and Cure on the Water Absorption and Glass Transition Temperature of Amine‐cured Epoxies
Abstract The effect of structure, composition, and cure on the water absorption and T g of amine‐cured epoxies was investigated. Water absorption is considered to depend on the polar group concentration and type, and on the amount of free volume in the polymer network. The contribution of polar groups in terms of thei…
Determination of metal particle size of highly dispersed rhodium, iridium and platinum catalysts by hydrogen chemisorption and EXAFS
Determination of metal particle size of highly dispersed Rh, Ir, and Pt catalysts by hydrogen chemisorption and EXAFS
The Eu(III) ion as luminescent probe: Laser-spectroscopic investigation of the metal ion sites in an 18-crown-6 complex
The structure of [Eu(NO3)2(18-6)]3[Eu(NO3)6] has been probed by high-resolution excitation and emission spectra at 77 and 4.2 K. The compound contains centrosymmetric [Eu(NO3)6]3− ions with D2h, C2h, or Ci symmetry and three types of complex [Eu(NO3)2(18-6)]+ cations with D2 symmetry slightly distorted towards C2v. Th…
Suppression of platelet activity on microdomain surfaces of 2‐hydroxyethyl methacrylate‐polyether block copolymers
Block copolymers constructed from chains of poly(2-hydroxyethyl methacrylate) (PHEMA) and either poly-ethyleneoxide (PEO) or poly-propyleneoxide (PPO) were synthesized. These block copolymers exhibited microdomain structure. Platelet adhesion on their surfaces was investigated by a column elution method to examine the…