Kinetic pathways of the nematic-isotropic phase transition as studied by confocal microscopy on rod-like viruses
Kinetic pathways of the nematic-isotropic phase transition as studied by confocal microscopy on rod-like viruses
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DOI：
10.1088/0953-8984/17/45/055
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发表时间：
2005-11-16
影响因子：
2.7
通讯作者：
Dhont, JKG
中科院分区：
文献类型：
--
作者：
Lettinga, MP;Kang, K;Dhont, JKG
我们研究了棒状病毒(FD)和聚合物(葡聚糖)的混合物的相分离动力学，它有效地构成了一个吸引棒的系统。这种色散从流动诱导的完全向列态消失到向列相和各向同性相共存的区域。我们证明了动力学路径依赖于总浓度的实验证据。当淬火浓度较高时，系统是亚稳定的，我们观察到典型的形核和生长过程。对于低浓度猝灭，体系是不稳定的，体系发生调幅分解。在中等浓度下，我们看到两个分离过程之间的过渡，我们在那里定位调节点。
We investigate the kinetics of phase separation for a mixture of rod-like viruses (fd) and polymer (dextran), which effectively constitutes a system of attractive rods. This dispersion is quenched from a flow-induced fully nematic state into the region where the nematic and the isotropic phase coexist. We show experimental evidence that the kinetic pathway depends on the overall concentration. When the quench is made at high concentrations, the system is meta-stable and we observe typical nucleation-and-growth. For quenches at low concentration the system is unstable and the system undergoes a spinodal decomposition. At intermediate concentrations we see the transition between both demixing processes, where we locate the spinodal point.