Inventors at Oxford University have developed a new method to indirectly measure the surface tension of liquid by tracking reflected light intensity to assess the surface configuration. The procedure is reliable, repeatable, quick to set-up and use, contact-less and non-destructive.
Surface tension measurement is an important tool in the characterisation of surface-active liquids and mixtures. Although precise, traditional measuring methods suffer from several problems. With well-established methods, the volume of sample required may be many millilitres; sample recovery may be difficult or impossible; and the process may be time-consuming, manual, difficult to automate and unsuitable for hazardous samples.
By utilising a multiwell plate reader, the Oxford team has developed a novel method of measuring the surface tension of liquid. The method is based on the variation of light intensity that occurs as the angle of incidence changes for light reflected or transmitted onto a sample’s surface. This variation provides a measurement of the surface configuration, and hence surface tension, with a sensitivity comparable to conventional techniques.
Jennifer Johnson | alfa
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