Homodyne dynamic light scattering in supramolecular polymer solutions: anomalous oscillations in intensity correlation function.,Soft Matter

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Homodyne dynamic light scattering in supramolecular polymer solutions: anomalous oscillations in intensity correlation function.
Soft Matter ( IF 2.9 ) Pub Date : 2020-03-04 , DOI: 10.1039/c9sm02480h
Emilie Moulin ₁ , Irina A Nyrkova , Nicolas Giuseppone , Alexander N Semenov , Eric Buhler

Affiliation

Dilute solutions of electronically active molecules capable of irradiation-driven supramolecular self-assembly are studied by dynamic light scattering. We detect unusual well-defined oscillations in the long time range of the homodyne intensity correlation function for all solutions that were irradiated with white light prior to the measurements. The oscillation effect is attributed to the local laser-induced heating of the samples due to strongly enhanced absorption manifested by the supramolecular filaments. It is found that the oscillation frequency depends on the irradiation time, solution concentration, and the incident laser power, but is independent of the scattering angle. These observations are explained with a semi-quantitative theory relating the oscillation effect to thermo-gravitational convection flows generated by laser beam. The results suggest that the presence of such homodyne oscillations could be a sensitive probe for aggregation in many complex systems.

中文翻译：

超分子聚合物溶液中的Homodyne动态光散射：强度相关函数中的异常振荡。

通过动态光散射研究了能够辐射驱动的超分子自组装的电子活性分子的稀溶液。对于在测量之前用白光照射的所有溶液，我们在零差强度相关函数的长时间范围内检测到异常清晰的振荡。振荡效应归因于样品的局部激光诱导的加热，这是由于超分子细丝所表现出的吸收大大增强。已经发现，振荡频率取决于照射时间，溶液浓度和入射激光功率，但是与散射角无关。用半定量理论解释了这些观察结果，该理论将振荡效应与激光束产生的热引力对流有关。

更新日期：2020-03-26

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