Interfacial microrheology of DPPC monolayers at the air-water interface
Interfacial microrheology of DPPC monolayers at the air-water interface
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DOI：
10.1039/c1sm05383c
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发表时间：
2011-01-01
期刊：
影响因子：
3.4
通讯作者：
Squires, Todd M.
中科院分区：
文献类型：
--
作者：
Kim, KyuHan;Choi, Siyoung Q.;Squires, Todd M.
我们提出了系统的测量液体凝聚（LC）二棕榈酰磷脂酰胆碱（DPPC）在空气-水界面的单层的表面流变学。使用微加工，铁磁的“微按钮”作为新的微流变探针，我们测量的线性粘弹性模量的LC DPPC单分子膜的表面压力和频率的变化。该界面的可视化揭示了包括LC-DPPC单层的互锁液晶域引起粘弹性固体响应。随着表面压力的增加，两种不同的行为出现：对于低表面压力（8 mN m（-1）），
We present systematic measurements of the surface rheology of monolayers of liquid-condensed (LC) dipalmitoylphosphatidylcholine (DPPC) at the air-water interface. Using microfabricated, ferromagnetic 'microbuttons' as new microrheological probes, we measure the linear viscoelastic moduli of LC DPPC monolayers as both surface pressure and frequency are varied. Visualization of this interface reveals that the interlocked liquid crystalline domains that comprise an LC-DPPC monolayer give rise to a viscoelastic solid response. Two distinct behaviors arise as surface pressure is increased: for low surface pressures (8 mN m(-1)