SAXS anti-peaks reveal the length-scales of dual positive-negative and polar-apolar ordering in room-temperature ionic liquids
SAXS anti-peaks reveal the length-scales of dual positive-negative and polar-apolar ordering in room-temperature ionic liquids
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DOI：
10.1039/c2cc30609c
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发表时间：
2012-01-01
影响因子：
4.9
通讯作者：
Margulis, Claudio J.
中科院分区：
文献类型：
--
作者：
Kashyap, Hemant K.;Hettige, Jeevapani J.;Margulis, Claudio J.
具有相同空间周期性但存在相位偏移的结构模式会在 SAXS 结构函数 S(q) 中的相同 q 值处产生峰值和反峰值（负向峰值）。例如，在离子液体中，我们经常发现电荷交替，并且在发现相同类型电荷密度增强的距离处，也会发现相反符号电荷的耗尽。另一种这样的情况出现在极-非极密度中。在同一类型（极性-极性或非极性-非极性）密度增强的距离处，相反类型（极性-非极性）密度也会减少。这产生了前峰和我们所说的相同空间周期性反前峰。
Structural patterns that have the same spatial periodicity but a phase offset give rise to peaks and anti-peaks (negative-going peaks) at the same q value in the SAXS structure function S(q). As an example, in ionic liquids we often find charge alternation, and at the distance where one finds a density enhancement of charges of the same type one also finds a depletion of charges of opposite sign. Another such situation arises with polar-apolar densities. At distances where there is enhancement of same-type (polar-polar or apolar-apolar) densities there is also a depletion of opposite-type (polar-apolar) density. This gives rise to prepeaks and what we call same spatial periodicity anti-prepeaks.