Angelo Pommella , Valentina Preziosi , Sergio Caserta , Jonathan M. Cooper , Stefano Guido , and Manlio Tassieri
Recently, optical tweezing has been used to provide a method for microrheology addressed to measure the rheological properties of small volumes of samples. In this work, we corroborate this emerging field of microrheology by using these optical methods for the characterization of very low viscoelastic polyelectrolyte solutions. The influence of polyelectrolyte (i.e. polyacrylamide, PAM) concentration, its aging and of salt concentration are shown. The close agreement of the technique with classical bulk rheological measurements is demonstrated, illustrating the advantages of the technique.
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