Video S1-S2

Video S1 shows the process that the liquid level in the cylinder gradually decreased between 0 and 12 h, while the thickness of the bright thin layer at the bottom increased, which is the supplementary datum of Figure 1a. Video S2 presents that the gel, supported on the filter paper, can be obtained by decanting the upper suspension.视频S1（Video S1）展示了0至12小时内圆柱容器内液面逐步降低，同时底部亮薄层的厚度持续增加的过程，该内容为图1a的补充数据。视频S2（Video S2）则呈现了通过倾去上层悬浮液，即可得到负载于滤纸上的凝胶的过程。