Using Optical Tweezers for the Characterization of Polyelectrolyte Solutions with Very Low Viscoelasticity

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• 作者：Angelo Pommella ; Valentina Preziosi ; Sergio Caserta ; Jonathan M. Cooper ; Stefano Guido ; Manlio Tassieri
• 刊名：Langmuir
• 出版年：2013
• 出版时间：July 23, 2013
• 年：2013
• 卷：29
• 期：29
• 页码：9224-9230
• 全文大小：436K
• 年卷期：v.29,no.29(July 23, 2013)
• ISSN：1520-5827

文摘

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 polyelectrolyte solutions with very low viscoelasticity. The influence of polyelectrolyte (i.e., polyacrylamide, PAM) concentration, specifically its aging, of the salt concentration is shown. The close agreement of the technique with classical bulk rheological measurements is demonstrated, illustrating the advantages of the technique.