Order and Disorder
Order and Disorder
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DOI：
10.1007/978-94-010-9628-7_5
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发表时间：
1985
期刊：
影响因子：
--
通讯作者：
B. Silver
中科院分区：
文献类型：
--
作者：
B. Silver
分子从不休息。结晶磷脂中形式上刚性的全反式链具有朝向链的甲基尾部增加的振动自由度（图9）。在液晶相中，链是无序的，任何给定的链段都迅速改变其取向。我们期望给定片段的运动在紧密堆积的头部基团附近比在链的末端更受限制，但是由于给定片段的方向是时间依赖的并且不可预测的，我们只能对运动进行统计陈述。在这一章中，我们表明，各种光谱技术使我们能够作出这样的声明，因为他们提供了定量措施ofor，一个术语，我们很快将定义。我们使用的理论框架是为了处理液晶的物理性质而发明的。
Molecules never rest. The formally rigid all-trans chains in crystalline phospholipids have a measure of vibrational freedom that increases toward the methyl group tail of the chain (Figure 9). In liquid crystal phases the chains are disordered, any given segment rapidly changing its orientation. We expect the motion of a given segment to be more limited near the tightly packed head groups than at the tail ends of the chains but since the orientation of a given segment is time-dependent and unpredictable, we can only make statistical statements about motion. In this chapter we show that a variety of spectroscopic techniques allow us to make such statements since they provide quantitative measures oforder, a term we shortly shall define. The theoretic framework that we use was invented to deal with the physical properties of liquid crystals.