Activated carbon cloth dressing is an appropriate wound healing material due to its biocompatibility and adsorption characteristics. The influence of gamma radiation as a sterilization process on the adsorption and mechanical properties of activated carbon cloth was investigated. The specific surface area, micropore volume, pore size distribution, surface chemistry as well as the breaking load of activated carbon cloth before and after gamma radiation were examined. Characterization by nitrogen adsorption showed that the activated carbon cloth was a microporous material with a high specific surface area and micropores smaller than 1 nm. Gamma radiation decreased the specific surface area and micropore volume but increased the pore width. The sterilization process changed the surface chemistry quantitatively, but not qualitatively. In addition, the breaking load decreased but without any influence considering the further application of this material.
The paper reports on an experimental study of the Mode I interlaminar fracture of
unidirectional carbon fibers/epoxy resin composites. Mode I delamination strain energy release rate
GIC was determined in double cantilever beam (DCB) test, before and after gamma irradiation at
various doses. Glass transition temperature, Tg of epoxy matrix was determined from dynamic
mechanical measurements. The delamination surfaces of tested coupons were observed by scanning
electron microscopy. The variations in GIC values were correlated with irradiation doses, Tg values
and the features of delamination microfractographs, as well as with the variation under irradiation
of matrix or fibre/matrix dominated mechanical properties.
Low cost titanium alloy compacts were produced via the powder metallurgy approach through the hydride – dehydride process and hot consolidation (hot pressing and hot isostatic pressing). The conditions of the reversible hydride – dehydride process were determined by X-ray and scanning electron microscopy characterisation of powders. Powders were consolidated both above and below the β transformation temperature. The morphology of the microstructure, and the presence of open and closed pores, as well as residual particles of hydrides and oxides have a direct influence on the mechanical properties of compacts (tensile properties and impact toughness).
Unidirectional and angle-ply carbon/epoxy laminates were gamma irradiated up to doses
of 12 and 20 MGy. Composites with two different, low and high temperature epoxy matrices have
been submitted to irradiation and subsequent mechanical testing. The radiation effects were studied
by measuring in-plane, interalminar shear and transverse tensile strength, as well as interlaminar
strain energy release rate of tested composites. The immersion of composite plate in water at 80 oC
and mechanical measurements at elevated temperatures emphasized irradiation effects on
mechanical properties.
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