Tips and Tricks - Soft Matter
Simple method to measure rheological properties of soft surfaces by a micro-needle contact
Analysis Technology Center, Fujifilm Corporation, 210 Nakanuma, 250-0193, Minamiashigara, Kanagawa, Japan
Accepted: 23 August 2022
Published online: 14 September 2022
We developed a simple method to investigate rheological properties of soft surfaces, such as polymeric liquids and colloidal suspensions, by capturing the images of a metal micro-needle inserted into the surface. At contact, a meniscus-like deformation is formed on the surface. By relating the shape of the deformation to the balance of applied forces, local elasticity and viscosity just inside the surface are obtained. With a facile setup and rapid measurement process, the present method can be implemented to variety of systems, for instance, drying sessile drops and small volume of liquid confined in a capillary.
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