Materials Literature
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Novel chitosan-based polymeric networks were synthesized and characterized by FTIR, UV and C13 NMR. A naturally occurring crosslinking reagent—genipin, which has been used in herbal medicine and in the fabrication of food dyes, was used to prepare crosslinked chitosan hydrogel. The heterocyclic compound of genipin cro…
Most fire retardant nanocomposites are made from layered silicates and organic polymers, a variety of methods are used in their synthesis. The mechanism for the fire retardancy of these composites is generally considered to be due to the structure of the char formed during combustion, which enables the char to thermal…
Rotating ring‐disk collection experiments and stripping voltammetry have been used to detect Cu ions generated by dissolution of the Al 2 CuMg intermetallic compound in aqueous chloride solutions. Cu ions are generated under open‐circuit conditions (open‐circuit potential − 0.930 V SCE ), or by slight anodic or cathod…
Adsorption of NO and its co-adsorption with oxygen on TiO2 (Degussa P-25) were studied by FTIR spectroscopy. It was found that NO adsorption results in its disproportionation to NO− (1170 cm−1), N2O22− (1335 cm−1) and nitrates (1650–1550 and 1240–1220 cm−1). The nitrate bands develop with time and coordinated NO (ca.…
The story of the outset of the concept of immortal polymerization is presented. Immortal polymerization is the polymerization that gives polymers with a narrow molecular distribution, even in the presence of a chain transfer reaction, because of its reversibility, which leads to the revival of the polymers once dead,…
A two-dimensional model for quantitative evaluation of the effect of convective and diffusive substrate transport on biofilm heterogeneity was developed. The model includes flow computation around the irregular biofilm surface, substrate mass transfer by convection and diffusion, biomass growth, and biomass spreading.…
The photoelectrochemical properties of electrodeposited in aqueous solutions were investigated. The material showed long term stability under illumination at negative potentials. The diffusion length of electrons in the as‐deposited material was of the order of 10–100 nm. We did not observe photocathodic reduction of…
The use of plant fibers as a reinforcement in polyester matrices requires the issue of compatibility between the two phases to be addressed. Because plant fibers present hydrophilic surfaces and polyesters are generally hydrophobic, poor fiber–matrix dispersion and wetting of the fibers by the matrix may result. As a…
A simple, cost effective method for producing carbons with high mesopore contentis presented. The effect of the ratio of activating agent (ZnCl2) to carbon precursor (coconut shell) on pore size is investigated as is the nitrogen adsorption isotherm of these carbonaceous materials at 77 K. The mesoporosity is substant…
During the last few years, porphyrins and metalloporphyrins have attracted widespread attention as chromophores for studies in circular dichroism (CD), an indispensable chiroptical tool for monitoring chiral interactions. This review summarizes the multifaceted properties of porphyrins and metalloporphyrins, powerful…
Highly ordered, hydrothermally stable, caged cubic mesoporous silica structures (Imm) with unusually large pore size (120 Å) have been synthesized by using hydrophobic poly(butylene oxide) containing triblock PEO–PBO–PEO copolymer as a structure-directing agent.
In the last 10 years, the use of intravenous contrast media in magnetic resonance (MR) has become well-established clinical practice. Contrast media provide critical additional diagnostic information in many instances. The gadolinium chelates constitute the largest group of MR contrast media and are considered to be v…
This paper presents a review of models used to describe the properties of fouling resistant surfaces, i.e. the relationship between molecular structure and resistance to adsorption/adhesion of biological moieties. In particular, the well established 'physical' school of thought, mostly based on ideas stemming from the…
The performance of coated and bonded aluminium relies heavily upon its surface chemistry and hence characterization of the aluminium surface is important. A method to quantify the hydroxide concentration at aluminium oxide/hydroxide surfaces by curve fitting the O 1s peak is developed and tested in this paper. Pseudob…
Sonoluminescence, the transduction of sound into light, is a phenomenon that pushes fluid mechanics beyond its limit. An initial state with long wavelength and low Mach number, such as is realized for a gas bubble driven by an audible sound field, spontaneously focuses the energy density so as to generate supersonic m…
In situ surface X‐ray diffraction was used to identify the detailed structure of the passive film that forms on (000)− and (110)‐oriented iron single crystals in a borate buffer solution at +0.4 V vs. mercurous sulfate reference electrode, a high passive potential. The passive film is a new phase: a spinel with a full…
The effects of crystallinity (xc) on the hydrolysis of high molecular weight poly(L-lactide) (PLLA) films in a phosphate-buffered solution at 37°C was investigated by gel permeation chromatography, tensile testing, differential scanning calorimetry, scanning electron microscopy, and polarizing optical microscopy. The…
The thermal conductivity of boron nitride and aluminum nitride particle epoxy-matrix composites was increased by up to 97% by surface treatment of the particles prior to composite fabrication. The increase in thermal conductivity is due to decrease in the filler-matrix thermal contact resistance through the improvemen…
Reported here is a study of the pattern of lattice curvature near the interface of deformed high-purity aluminium (99.9999%) bicrystals of specified crystallographic character (large-angle random). Curvature data are obtained from electron back-scattering diffraction pattern observations using orientation imaging micr…
The purpose of this paper is to review the current processing and resultant properties of standard Nitinol wire for guide-wire applications. Optimised Ti-50.8at%Ni wire was manufactured according to industry standards by precise control of the composition, cold work and continuous strain-age annealing. Mechanical prop…