The glass tubes filled with pregel solution were placed on the stage of an inverted microscope (ECLIPSE Ti-U, Nikon). A coherent laser beam with a wavelength of 488 nm and a diameter of 0.5 mm (OBIS 488 LS, Coherent) was directed onto the glass tube. The scattered light was collected via a 10× objective lens (TU Plan Fluor EPI, Nikon) and recorded by an EMCCD camera (iXon3, Andor Technology). The measurements were performed at room temperature (approximately 25°C).

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