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• W3104455891 abstract "Entangled ring polymers, along with blends of ring and linear polymers, continue to be a topic of great interest and debate due to the conflicting experimental results in the literature as well as the difficulty of producing entangled synthetic rings devoid of linear contaminants. Here, we create blended solutions of entangled ring and linear DNA with varying mass fractions of linear DNA. We use optical tweezers microrheology to measure the linear and nonlinear viscoelastic response of these blends. Our measurements reveal a strong non-monotonic dependence of linear viscoelastic properties on linear DNA fraction, with a pronounced maximum when the mass fraction of rings and linear chains are comparable, suggestive of pervasive threading of rings by linear chains. We observe a similar non-monotonicity in the nonlinear regime; however, a comparatively higher fraction of linear chains (0.5-0.7) is required for a substantial increase in resisitive force and slowing of relaxation dynamics to emerge. This nonlinear response also appears to be rate dependent, which we argue arises from force-induced de-threading of rings at high strain rates. Our results fill a longstanding gap in knowledge regarding the microrheology and nonlinear response of ring-linear polymer blends. Moreover, the uniquely strong mechanical response that ring-linear blends exhibit, along with the ability to finely tune these blends by varying the blend composition, provides new materials design principles." @default.
• W3104455891 created "2020-11-23" @default.
• W3104455891 creator A5039745090 @default.
• W3104455891 creator A5060161826 @default.
• W3104455891 creator A5064479674 @default.
• W3104455891 creator A5070763672 @default.
• W3104455891 date "2020-05-22" @default.
• W3104455891 modified "2023-10-16" @default.
• W3104455891 title "Viscoelastic properties of ring-linear DNA blends exhibit nonmonotonic dependence on blend composition" @default.
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• W3104455891 doi "https://doi.org/10.1103/physrevresearch.2.023213" @default.
• W3104455891 hasPublicationYear "2020" @default.
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