Carrio Juan A G, Donato Ricardo K, Carvalho Alexandra, Koon Gavin K W, Donato Katarzyna Z, Yau Xin Hui, Kosiachevskyi Dmytro, Lim Karen, Ravi Vedarethinam, Joy Josny, Goh Kelda, Emiliano Jose Vitorio, Lombardi Jerome E, Neto A H Castro
Centre for Advanced 2D Materials, National University of Singapore, Singapore, 117546, Singapore.
Institute of Inorganic Chemistry of the Czech Academy of Sciences, Husinec-Řež 1001, 25068, Řež, Czech Republic.
Sci Rep. 2025 Jan 11;15(1):1669. doi: 10.1038/s41598-024-81882-1.
Kaolinite is a single 2D layer of kaolin or metakaolin (MK), common clays that can be characterized as layered 3D materials. We show that because of its chemical composition, kaolinite can be converted into an amorphous 3D material by chemical means. This dimensional transformation is possible due to the large surface to volume ratio and chemical reactivity of kaolinite. We investigate the formation and influence of quasi- or nanocrystalline phases in MK-based alkali-activated materials (AAM) that are related to the Si/Al ratio. We analyze the formation of an AAM from a MK precursor, which is a 3D bonded network that preserves the layered structure at the nanometer scale. We also exfoliate the remaining layered phase to examine the effects of the alkali-activation in the final sheet structures embedded within the amorphous network. The final material can be used as a cement with no carbon dioxide produced by the transformation reaction.
高岭石是高岭土或偏高岭土（MK）的单一二维层，高岭土和偏高岭土是常见的粘土，可被表征为层状三维材料。我们表明，由于其化学成分，高岭石可以通过化学方法转化为无定形三维材料。由于高岭石的大表面积与体积比和化学反应性，这种维度转变是可能的。我们研究了基于偏高岭土的碱激活材料（AAM）中与硅铝比相关的准晶相或纳米晶相的形成及其影响。我们分析了由偏高岭土前驱体形成的碱激活材料，它是一个三维键合网络，在纳米尺度上保留了层状结构。我们还剥离了剩余的层状相，以研究碱激活对嵌入无定形网络中的最终片状结构的影响。最终材料可用作水泥，转化反应不产生二氧化碳。
