University of Greenwich

About: University of Greenwich is a education organization based out in London, United Kingdom. It is known for research contribution in the topics: Population & Context (language use). The organization has 3749 authors who have published 9958 publications receiving 234340 citations.

Effect of Cosolvents and Cosolutes upon Aggregation Transitions in Aqueous Solutions of the Poloxamer F87 (Poloxamer P237): A High Sensitivity Differential Scanning Calorimetry Study

Abstract: The effects of a number of different cosolvents and cosolutes upon the micellization of the oxyethylene/oxypropylene/oxyethylene block copolymer F87 (P237; 70% oxyethylene and 30% oxypropylene) have been investigated using high-sensitivity differential scanning calorimetry (HSDSC). The calorimetric output has been analyzed using a model fitting procedure to obtain estimates for various thermodynamic parameters which characterize the micellization event as observed by HSDSC. These important parameters include T1/2, the temperature at which the micellization process is half-completed, ΔHcal, the calorimetric enthalpy for the process which is measured by integration of the calorimetric output; ΔHvH, the van't Hoff enthalpy; and n the aggregation number. From this data it has been possible to measure critical micelle concentrations (cmcs). The experimental investigations reveal that methanol, ethanol, urea, and formamide prevent the onset of micellization, while butanol and hydrazine favor micelle formation. ...

A finite volume procedure to solve elastic solid mechanics problems in three dimensions on an unstructured mesh

Abstract: A Finite Volume (FV) procedure is described for solving the elastic solid mechanics equations in three dimensions on an unstructured mesh, for bodies undergoing thermal or mechanical loads. The FV procedure is developed in parallel with the conventional FE Galerkin procedure so that the differences in each approach may be clearly distinguished. The matrix form of the FV procedure is described, and is implemented in parallel with the FE procedure, both for two-dimensional quadrilateral and three-dimensional brick meshes. The FV and FE procedures are then compared against a range of benchmark problems that test the basic capability of the FV technique. It is shown to be approximately as accurate as the FE procedure on similar meshes, though its system matrix set-up time is twice as long for a node by node set-up procedure.

Preparation of novel titania photocatalysts with high activity

Abstract: New anatase photocatalysts have been prepared by a hydrothermal technique. The powders have been shown to have a high photocatalytic activity, which is believed to be derived from their high crystallinity and phase purity resulting in fewer defects that can allow pre-emptive recombination of the free electron and positive hole. Bi-phasic particles containing both the anatase and brookite phases have also been prepared, but these have much lower photocatalytic activity.