Preventing Wall Slip in Rheology Experiments

Wall slip is a common problem when testing highly concentrated emulsions or suspensions on a rheometer. It is usually caused by large velocity gradients in a thin region adjacent to the wall. When slip occurs, the measured viscosity can be significantly lower than the actual viscosity of the sample. To overcome this influence, we have introduced a series of roughened surface geometries, such as crosshatched or serrated plates, which significantly improve the contact between the geometry and the sample to reduce slip.

Must Know Analytical Techniques for Biopharma Developers

eBook Must Know Analytical Techniques for Biopharma Developers A guide to pivotal analytical techniques for biopharmaceutical formulations and development Five takeaways you’ll learn from this eBook: Assess biopharmaceuticals qualitatively and quantitatively – including differentiation between conjugate types and drug-to-antibody ratios Determine ideal formulation conditions and identify changes during drug manufacturing or storage Gain a clear…

Determination of the Relative Oxidative Stability of Polyethylene Bottle Tops by Differential Scanning Calorimetry (DSC)

Oxidative degradation of polymers is an exothermic process (releases heat) and is detectable by differential scanning calorimetry (DSC). Furthermore, DSC evaluation of polyethylene at elevated temperatures in the presence of oxygen is an effective method for accelerating the onset of degradation so that longer term (shelf life) properties can be predicted and/or compared.