Molecular Imaging of Slip in Entangled DNA Solution

作     者：Pouyan E. Boukany Orin Hemminger Shi-Qing Wang L. J. Lee 

作者机构：Nanoscale Science and Engineering Center for Affordable Nanoengineering of Polymeric Biomedical Devices The Ohio State University Columbus Ohio 43210 USA Department of Polymer Science University of Akron Akron Ohio 44325 USA Department of Chemical and Bimolecular Engineering The Ohio State University Columbus Ohio 43212 USA 

出 版 物：《Physical Review Letters》 (Phys Rev Lett)

年 卷 期：2010年第105卷第2期

页      面：027802-027802页

核心收录：

学科分类：07[理学] 0702[理学-物理学] 

基　　金：National Science Foundation under NSF [EEC-0425626  DMR-0821697] 

主　　题：Molecular imaging 

摘      要：This work obtains the first molecular imaging of wall slip in entangled solutions. Using a combination of confocal fluorescence microscopy and rheometry, molecular images were captured in the nonlinear response regime of entangled DNA solutions. Conformations of DNA molecules were imaged during shear to correlate with the magnitude of wall slip. Interfacial chain disentanglement results in wall slip beyond the stress overshoot. Sufficient disentanglement can produce tumbling of individual DNA in the entangled solutions.