Elasticity and Viscosity of DNA Liquid Crystals,ACS Macro Letters

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Elasticity and Viscosity of DNA Liquid Crystals
ACS Macro Letters ( IF 5.1 ) Pub Date : 2020-06-24 , DOI: 10.1021/acsmacrolett.0c00394
Liana Lucchetti ₁ , Tommaso P Fraccia _{2,

3} , Giovanni Nava _{1,

3} , Taras Turiv ₄ , Fabrizio Ciciulla ₁ , Lucas Bethge ₅ , Sven Klussmann ₅ , Oleg D Lavrentovich _{4,

6} , Tommaso Bellini ₃

Affiliation

Concentrated solutions of blunt-ended DNA oligomer duplexes self-assemble in living polymers and order into lyotropic nematic liquid crystal phase. Using the optical torque provided by three distinct illumination geometries, we induce independent splay, twist, and bend deformations of the DNA nematic and measure the corresponding elastic coefficients K₁, K₂, and K₃, and viscosities η_splay, η_twist, and η_bend. We find the viscoelasticity of the system to be remarkably soft, as the viscoelastic coefficients are smaller than in other lyotropic liquid crystals. We find K₁ > K₃ > K₂, in agreement with the elasticity of the nematic phase of flexible polymers, and η_bend > η_splay > η_twist a behavior that is nonconventional in the context of chromonic, polymeric, and thermotropic liquid crystals, indicating a possible role of the weakness and reversibility of the DNA aggregates.

中文翻译：

DNA液晶的弹性和粘度

钝端 DNA 寡聚体双链体的浓缩溶液在活性聚合物中自组装并排列成易溶向列液晶相。使用由三种不同的照明几何结构提供的光学扭矩，我们诱导 DNA 向列的独立展开、扭曲和弯曲变形，并测量相应的弹性系数K ₁、K ₂和K ₃以及粘度 η_展开、 η_扭曲和η_弯曲。我们发现系统的粘弹性非常柔软，因为粘弹性系数小于其他溶致液晶。我们发现K ₁ > K ₃> K ₂，与柔性聚合物的向列相的弹性一致，并且 η_弯曲> η_展开> η_扭曲在发色、聚合物和热致液晶的背景下是非常规的行为，表明DNA 聚集体的弱点和可逆性。

更新日期：2020-07-21

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