Lee Yunchan, Jo Min-Gi, Kim Jaekyoung, Kim Ji Hoon, Kim Jae Jung, Char Kookheon, Yoon Hyunsik
Institute of Energy and Environment System, Seoul National University of Science and Technology, Seoul, 01811, Republic of Korea.
The National Creative Research Initiative Center for Intelligent Hybrids, The World Class University Program for Chemical Convergence for Energy and Environment, School of Chemical and Biological Engineering, Seoul National University, Seoul, 08826, Republic of Korea.
Adv Mater. 2023 Aug;35(32):e2300952. doi: 10.1002/adma.202300952. Epub 2023 Jun 29.
Mesoporous microparticles have the potential to be used in various fields, such as energy generation, sensing, and the environmental field. Recently, the process of making homogeneous microparticles in an economical and environmentally friendly way has gained much attention. Herein, rectangular mesoporous microblocks of various designs are produced by manipulating the fragmentation of colloidal films consisting of micropyramids while controlling the notch angles of pyramidal edges. During calcination of the colloidal films, cracks are generated in the valleys of micropyramids acting as notches, and the angle of notches can be controlled by the prepattern underneath the micropyramids. By changing the location of notches with sharp angles, the shape of microblocks can be controlled with excellent uniformity. After detaching the microblocks from substrates, mesoporous microparticles of various sizes with multiple functions are easily produced. This study demonstrates anti-counterfeiting functions by encoding the rotation angles of rectangular microblocks of various sizes. In addition, the mesoporous microparticles can be utilized for separating desired chemicals mixed with chemicals of different charges. The method of fabricating size-tunable functionalized mesoporous microblocks can be a platform technology to prepare special films and catalysts and for environmental applications.
介孔微粒有潜力应用于多个领域，如能量产生、传感以及环境领域。近来，以经济且环保的方式制备均匀微粒的过程备受关注。在此，通过操控由微金字塔组成的胶体膜的破碎，同时控制金字塔边缘的缺口角度，制备出了各种设计的矩形介孔微块。在胶体膜煅烧过程中，充当缺口的微金字塔谷底会产生裂纹，且缺口角度可通过微金字塔下方的预图案来控制。通过改变锐角缺口的位置，能以极佳的均匀性控制微块的形状。将微块从基底上分离后，可轻松制备出具有多种功能的不同尺寸的介孔微粒。本研究通过对各种尺寸的矩形微块的旋转角度进行编码，展示了防伪功能。此外，介孔微粒可用于分离与不同电荷的化学物质混合的所需化学物质。制备尺寸可调的功能化介孔微块的方法可成为制备特殊薄膜和催化剂以及用于环境应用的平台技术。
