The Institute of chemistry of the Chinese Academy of Sciences has made important progress in the research of fine assembly and patterning in printing

The fine assembly of particles with different sizes is of great significance for the preparation of complex structural materials and functional devices At present, the method of particle assembly has been widely studied, which usually needs to modify the surface of particles specifically or induce by special field, and the control of the long-range orientation of the assembly structure will be greatly limited Therefore, the development of universal, convenient, green and efficient assembly methods has important scientific value and application prospects Printing technology is an important method to realize patterning on substrate by using template and ink If the liquid containing micro nano particles is used as ink and the assembly of particles in the process of liquid drying is controlled by the template, the fine assembly and patterning of micro nano structure can be realized easily and quickly With the support of NSFC, the Ministry of science and technology and the Chinese Academy of Sciences, the researchers of the Key Laboratory of green printing of the Institute of chemistry of the Chinese Academy of sciences are engaged in the patterning assembly of nanomaterials (adv mater 2014, 26, 6950-6958; adv mater 2015, 27, 3928-3933), and the preparation of photonic crystal chips (angel Chem Int ed 2014, 53, 5791-5795); Angelw Chem Int ed 2016, 55, 6911-6914) and controlling the print droplets to achieve high-resolution patterns (adv mater 2013, 25, 6714-6718; adv mater 2016, 28, 1420-1426) have carried out systematic and in-depth research Fig 1 structural pattern source of zigzag and linear particle assembly: angelw Chem Int ed 2017, 56, 15348-15352 Fig 2 binary particle assembly to form different fine structural patterns: J am Chem SOC 2018, 140, 18-21 on the basis of the above research, they designed the method of capillary liquid bridge between the template and the substrate By controlling the liquid confined space, they ingeniously realized the controllable and accurate assembly and patterning of particles under the liquid confined space For the particles with a single size, the particles are gradually assembled to form an intermediate structure, and then the transition process to the final structure is affected by the viscosity of the system By controlling the viscosity of the system, fine saw tooth and linear assembly structures can be obtained (Fig 1) For the liquid with two different sizes of particles, because the liquid is gradually shrinking, the large and small particles are programmed to assemble under the condition of liquid confinement The large particles are first confined, and then assembled together with the small particles as templates By controlling the liquid confined space and the composition of particles, the fine control of various ordered one-dimensional co assembly structures has been successfully realized (as shown in Figure 2) The orientation control and patterning of the assembly structure are realized by the restriction of the liquid on the extension direction of the assembly region It is a breakthrough of nano printing technology in the field of advanced manufacturing It is of great significance to the fine patterning of micro and nano materials and the printing and manufacturing of functional devices The research results were published in the recently published German Applied Chemistry (angelw Chem Int ed 2017, 56, 15348-15352) and the Journal of American Chemical Society (j.am Chem SOC 2018, 140, 18-21), and were invited to write a review (angelw Chem Int ed 2018, DOI: 10.1002 / anie 201704752) Paper link: http://onlinelibrary.wiley.com/doi/10.1002/ange.201709115/full https://pubs.acs.org/doi/abs/10.1021/jacs.7b09738 http://onlinelibrary.wiley.com/doi/10.1002/anie.201704752/full brief introduction of corresponding author: Li Mingzhu researcher: http://159.226.64.165/web/25353/50 Li Mingzhu researcher: Song Yanlin researcher: http://159.226.64.165/web/25353/12 Researcher song Yanlin