Materials Literature
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This paper describes surface grafting of hyperbranched dendritic polyamidoamine, a new class of topological macromolecules, onto glass fiber for modification of the glass fiber surface. Glass fiber having surface amino groups as initiator sites was prepared by treatment of the glass fiber with 3-aminopropyltriethoxysi…
Brownian dynamics simulations have been carried out on a binary colloidal mixture of particles of two different diameters interacting via a Derjaguin-Landau-Verway-Overbeek potential. As the screening length is increased a transition from liquid to crystal (at a volume fraction $\ensuremath{\varphi}=0.2$) or a glassy…
In typical polymerizations of propene, the stereochemical structures of the resulting polymer depend on the replication probability (for meso placements) in two ways. Decrease in this probability decreases the overall isotactic content, but also decreases the average lengths of the isotactic sequences. New catalysts,…
The author looks back over a scientific career of almost 50 years spent mainly in research on liquid crystals (LCs) and carried out largely in University service and latterly for about five years in Industry. In this review, the development through its rapid escalation starting in the early 1970s and stemming from the…
A new method evaluating the fibril width and length of disintegrated bacterial cellulose was developed using optical and rheological analysis. During the early stages of the disintegration process, the bacterial cellulose particles formed loose fibrous aggregates, followed by cutting of the disintegrated fibrils that…
F. J. Feher, K. D. Wyndham and D. J. Knauer, Chem. Commun., 1998, 2393 DOI: 10.1039/A806684A
The 2E state lifetime of the C3 ion [Cr(fac-Me5-D3htrico-saneN6)]3+ is 235 µs in H2O and 1.5 ms in D2O at 298 K, the longest lifetimes yet reported for a saturated Cr(III)N6 chromophore at room temperature.
Lithium loss kinetics from polycrystalline Li x Ni 1–x O has been investigated in the temperature range 900-1500°C by measuring the time and temperature dependence of the weight and lattice constant change of the samples. At 900°C the rate of Li 2 O evaporation was controlled by lithium ion diffusion in Li x Ni 1–x O.…
The XPS spectra of Nordstrandite were collected with a VSW HA150 using monochromatic Al Kα x-radiation. Monochromatic radiation provides a distinct clarity to the peak structure in the valence band of Nordstrandite due to the absence of interfering x-ray satellites from the intense O 2s region. Variations in the inten…
To estimate micro-segregation with dendritic solidification, a common method using an integral profile method has been developed. We considered three cases; (1) no diffusion in the solid and finite diffusion in the liquid, (2) finite diffusion in the solid and complete diffusion in the liquid, and (3) finite diffusion…
Nitronyl nitroxide radicals bridged by olefinic spacers display strong intramolecular and antiferromagnetic exchange interactions, the magnitude of which depends on the length of the spacer and on steric crowding around the radicaloid subunits.
—Different amounts (5-20 wt% with respect to the solids content in the adhesive) of a hydrated magnesium/aluminum silicate (attapulgite) were added to solvent-based polyurethane (PU) adhesive formulations. The rheological, thermal, mechanical, surface, and adhesion properties of the filled PU adhesives obtained were m…
Magic-angle-spinning NMR spectroscopic studies ${(}^{27}\mathrm{Al})$ have been undertaken to probe the local structure of Al in Al-Te glasses and stoichiometric and nonstoichiometric crystalline Al-Te samples. The chemical-shift values obtained clearly indicate that there are two different Al environments in Al-Te gl…
The bearing rig tests performed in this study demonstrate superior bearing performance of Cronidur 30 steel over conventional bearing steels. In these tests the L10 life of Cronidur 30 steel as calculated by the DIN/ISO 281 method was 80 times the unfactored L10 life under full lubrication conditions. In boundary lubr…
Abstract Radiation decomposition and aerosol formation of various volatile organic compounds (VOCs) were examined to get information on a treatment of industrial off-gas. Model gases, air containing aromatic VOCs, chloroethenes and 1,2-dichloroethane, were sealed in batch reactors and irradiated with electron beam (EB…
Boron added to urea formaldehyde (UF) resin during manufacture of board from waste tea leaves was combined with a fire-retardant coating system containing boron to further reduce combustibility. Boric acid (BA) and borax (BX) were used as boron compounds separately or in a mixture of 5:1 (BA:BX, w/w) in aqueous soluti…
The purpose of this research was to monitor the migration of formaldehyde from a polyethylene glycol (PEG) fill into the gelatin shell of a soft elastic gelatin capsule (SEGC) using near-infrared (NIR) spectrophotometry. SEGCs were filled with five solutions of aqueous formaldehyde in PEG (0, 0.05, 0.10, 0.20, and 0.4…
The synthesis of carbohydrate surfactants bearing carbosilane, silane, polysilane and non-permethylated siloxane moieties is described. These surfactants consist of three structural elements: (1) a silicon-containing moiety, (2) a spacer and (3) a carbohydrate unit. Additionally two different types of mixed structures…
Severe plastic deformation (SPD) processing is widely used to control and refine the grain size of monolithic metals and alloys, with grain sizes of less than 100 nm produced in recent years. One particular SPD technique, severe plastic torsional straining, has been found to effectively consolidate both micrometre and…
The purpose of this paper is to search for bistable hydrocarbons for which the lowest singlet and triplet states are nearly degenerate in their substantially different equilibrium geometries, the two wells being separated by a significant energy barrier. For non-alternant hydrocarbons with fused odd-membered rings, tw…