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- W3216036225 abstract "Polymer topology has been shown to play a key role in tuning the dynamics of complex fluids and gels. At the same time, polymer composites, ubiquitous in everyday life, have been shown to exhibit emergent desirable mechanical properties not attainable in single-species systems. Yet, how topology impacts the dynamics and structure of polymer composites remains poorly understood. Here, we create composites of rigid rods (microtubules) polymerized within entangled solutions of flexible linear and ring polymers (DNA) of equal length. We couple optical tweezers microrheology with confocal microscopy and scaled particle theory to show that composites with linear DNA exhibit a strongly nonmonotonic dependence of elasticity and stiffness on microtubule concentration due to depletion-driven polymerization and flocculation of microtubules. In contrast, composites containing ring DNA show a much more modest monotonic increase in elastic strength with microtubule concentration, which we demonstrate arises from the decreased conformational size and increased miscibility of rings." @default.
- W3216036225 created "2021-12-06" @default.
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- W3216036225 date "2021-11-19" @default.
- W3216036225 modified "2023-10-17" @default.
- W3216036225 title "DNA Conformation Dictates Strength and Flocculation in DNA–Microtubule Composites" @default.
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- W3216036225 doi "https://doi.org/10.1021/acsmacrolett.1c00638" @default.
- W3216036225 hasPubMedId "https://pubmed.ncbi.nlm.nih.gov/35549144" @default.
- W3216036225 hasPublicationYear "2021" @default.
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