AFM: Polymeric paper for remote photo-writing in water/ice
Recently, the research result of Liu Hezhou's group entitled "Reversible Writing/Re-Writing Polymeric Paper in Multiple Environments" from the School of Materials Science and Engineering of Shanghai Jiao Tong University was published online in the internationally renowned academic journal "Advanced Functional Materials".
In this paper, a multifunctional polymeric paper with multi-environmental stability was proposed for the first time, which could achieve both light writing and light re-writing simultaneously in the air/water/ice. (Figure 1)
Figure 1. Schematic diagram of remote writing in the ice.
To acquire the optimum performance, a variety of Fe-based oxides with submicron structures were prepared through different MOF templates and heat treatments. After comparison, Fe-based oxides could inherit the geometric structure of the MOF templates while the amino groups of MOF were conducive to the collapse of the structure, resulting in the enhancement of the absorption of NIR irradiation. (Figure 2)
Figure 2. (a) Schematic presentation of the preparation by the one-pot method of the composite PU-AZO11-smFe. (b) The Schematic preparation of submicron particles base on the MOF-based templating method.
Due to the addition of Fe-based oxides, the mechanical properties were promoted, which was suitable for ultrastrong and malleable paper. Besides, the presence of the liquid crystal phase serving as the ink was closely tied to the polymeric paper with π-π interaction from the unique patch-sewing structure, which was essential for the light writing performance. (Figure 3)
When the surface of the polymeric paper was scratched, the track and stress concentration would be recorded as writing, which could be erased entirely by the exposure of NIR irradiation in multiple conditions. (Figure 4)
Figure 4. (a) Schematic diagram of the reversible cycle of writing and erasing behavior induced by NIR of polymeric paper. (b) NIR-induced re-writing behavior of polymeric paper in the water. (c) NIR-induced re-writing behavior of polymeric paper in the ice.
What is more, the remote light writing with precision could be realized in multiple environments after the pre-rubbed process, providing a promising potential in the substitute of traditional papers for sustainable development requirements, especially in the field of deep-water and aerospace exploration. (Figure 5)
Figure 5. (a) Schematic diagram of the reversible cycle of remote light writing behavior induced by a focused NIR source of the polymeric paper. (b) NIR-induced remote writing behavior of the polymeric paper in the water. (c) NIR-induced remote writing behavior of the polymeric paper in the ice.
Chi Chen, a PhD candidate, was the first author, while associate Professor Yujie Chen and Professor Hua Li of the School of Materials Science and Engineering of Shanghai Jiao Tong University were the corresponding authors. This work was supported by the grant of the Joint Fund of the Education Ministry of China (No. 6141A02022264), the Natural Science Foundation of China (NSFC) (No. U1733130, 11704244, 11674218) and the National Key Research and Development Program of China (No. 2020YFC1910204).
Link to the paper: https://onlinelibrary.wiley.com/doi/10.1002/adfm.202104784