Materials Literature
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Crystallisation and recrystallisation are important unit operations in the pharmaceutical industry. In our experience cooling crystallisations are preferred to other ways of generating supersaturation because they are quicker to develop and provide better control of purity and polymorph and particle properties. There…
Abstract The focus of this work is the study of the thermal aging of high‐performance fibers used in the making of fire protective garments. Accelerated thermal aging tests were carried out on fabric samples made up of a blend of Kevlar® (poly p ‐phenylene terephthalamide) and PBI (poly benzimidazole) staple fibers, a…
In this contribution we provide a review and reformulation of perturbation theories (generalised van der Waals approaches) for the description of the fluid phase behaviour and orientational ordering transitions of thermotropic nematic liquid crystals. Free-energy functionals of the basic Onsager form are used as the p…
Graphene nanoflakes (GNFs) with average diameters of ∼30 nm have been prepared by a single-step oxidation procedure using single-wall carbon nanotube arc-discharge material and nitric acid. The GNFs are predominately single sheets containing a small number of internal defects. The edges are decorated with primarily ca…
The influence of crystal polymorphism on the three-phase structure of isotactic poly(1-butene) (PB-1) is discussed. Crystallization of PB-1 from the melt yields the tetragonal phase, known as form II. Upon storage, it spontaneously transforms to the trigonal form I. The chain motion within the crystalline parts varies…
The preparation of dynamically vulcanized TPU (thermoplastic polyurethane)/EVM (ethylene-vinyl acetate copolymer rubber) blends and the effect of two peroxide curing agents, DCP (dicumyl peroxide) and BIPB (bis(tert-butyl peroxy isopropyl)benzene) on the mechanical properties, hot air aging, and oil resistance were in…
Provision of an inert gas atmosphere with high-purity argon gas is recommended for preventing titanium castings from contamination although the effects of the level of argon purity on the mechanical properties and the clinical performance of Ti castings have not yet been investigated. The purpose of this study was to…
Two different solvent mixtures, chloroform/dimethylformamide (DMF) and chloroform/ acetone, in 60/40 v/v concentrations, were used to electrospin poly(D,L-lactic acid) (PDLLA). The influence of solvent type, solution concentration, and processing conditions on the morphology and properties of the electrospun mats was…
Molecular photoswitches have been used to investigate the possibility of nanostructured polar and nonpolar domains in ionic liquids (ILs). Two photochromic compounds, spiropyran (BSP) and spirooxazine (SO) were added to imidazolium based ionic liquids containing the anion [NTf2](-), and their photochromic behavior was…
Thermal behaviour and kinetics of dehydration in air of bassanite (calcium sulphate hemihydrate, CaSO40.5H2O) have been investigated in situ real-time using laboratory parallel-beam X-ray powder diffraction data. Thermal expansion has been analyzed between 303 and 383 K at increments of 5 K. The bassanite ! g-anhydrit…
In this work we investigate the effects of yarn diameter and gauge length on the statistical strength of yarns spun from carbon nanotubes (CNTs). Tensile tests are conducted on a large sample set of nanostructured CNT yarns. The data show that strength varies substantially and both strength and statistical dispersion…
Abstract IR, Raman and surface‐enhanced Raman scattering (SERS) spectra of sulfanilic acid sodium salt (SANA) were recorded and analysed. The vibrational wavenumbers were computed by the density functional theory method using the B3LYP/6–31G* basis and found to be in good agreement with the experimental values. The ef…
Lanthanide complexes of two tris(amide) derivatives of PCTA were synthesized and characterized. The relaxometric and luminescence properties of their lanthanide complexes were investigated as bimodal magnetic resonance (MR) and optical imaging agents. Luminescence studies show that one of the Tb(III) complexes dimeriz…
We measure systematically the intrinsic scaling behavior of dynamic hysteresis for Pb(0.9)Ba(0.1)(Zr(0.52)Ti(0.48))O(3) (PBZT) ferroelectric thin films with Pt electrodes on Si substrates, utilizing the Sawyer-Tower technique. For the as-prepared thin films of similar thickness and microstructure, over the low frequen…
Graphite oxide (GO)/polypyrrole (PPy) composites with high electrical conductivity have been prepared via in situ polymerization. The bonding structures of the resulting composites were characterized by ultraviolet (UV)-visible spectra and X-ray photoelectron spectroscopy (XPS), which indicate no significant chemical…
The orthorhombic perovskite, (La(1-x/2)Bi(x/2))(Fe(0.5)Cr(0.5))O(3) was investigated for 0≤x≤1. Its space group, Pnma, compatible with the disordering of iron and chromium in the B sites, confirms previous observations. More importantly this compound is found to be an uncompensated weak ferromagnet, with a very peculi…
A two-step magnetically assisted capillary action method is demonstrated as a facile technique to produce hollow carbon nanotubes filled with uniformly dispersed Fe3O4 nanoparticles (NPs). Template-assisted chemical vapor deposition (CVD) grown CNTs with average diameter 200-300 nm and length 5-6 microm were effective…
High-resolution studies of domain configurations in Langmuir-Blodgett films of ferroelectric polymer poly(vinylidene fluoride-trifluoroethylene), P(VDF-TrFE), have been carried out by means of piezoresponse force microscopy (PFM). Changes in film thickness and morphology cause significant variations in polarization pa…
For the first time, high surface area nanofibers were synthesized using aluminum isopropoxide monomer with acetic acid as the polycondensation agent in the green solvent, supercritical carbon dioxide (scCO(2)). It was found that the synthesis temperature, pressure, concentration, and acid/alkoxide ratio had a large ef…
Abstract A novel chitosan–anthraldehyde derivative film was prepared by the reaction of 79% deacetylated chitosan with 9‐anthraldehyde with a hydrogel by a solution casting method. The prepared chitosan derivative film was confirmed by ultraviolet–visible absorption spectroscopy of the absorption peak at 266 nm due to…