Abstract
Biomineralization has been given a great deal of attention by materials chemists because of its low environmental load and sustainability. With the goal of synthesizing such processes, various methods have been developed, especially for inorganic salts of calcium. In this report, we focused on the deposition of inorganic salts, such as calcium carbonate and calcium phosphate using crystal crosslinked gels (CCG), which are prepared by crystal crosslinking of metal-organic frameworks (MOFs). Due to the crystalline nature of MOFs, CCGs intrinsically possess polyhedral shapes derived from the original MOF crystals. As the result of deposition, the obtained inorganic salts also exhibited a polyhedral shape derived from the CCG. The deposition mainly occurred near the surface of the CCG, and the amorphous nature of the deposited inorganic salts was also confirmed.
Highlights
Organisms have developed various biominerals by hierarchically combining soft and hard materials with elaborate structural designs in multiscale, to achieve greater performance than the single components [1,2]
We demonstrated the deposition of inorganic salts such as calcium carbonate and calcium phosphate by using crystal crosslinked gels (CCG) as the shape-directing agent
CLIR15, which were transformed to corresponding CCGs, UiO68CCG and IR15CCG, via acidification
Summary
Organisms have developed various biominerals by hierarchically combining soft and hard materials with elaborate structural designs in multiscale, to achieve greater performance than the single components [1,2]. For the inorganic salt for the scaffold, they usually employ calcium carbonate, hydroxyapatite, silicate, and iron oxide. From the viewpoint of sustainability and low environmental loads, such biomineralization processes have attracted great attention from material scientists, and various systems to control the crystallization process of inorganic salts have been explored up to the present, when synthetic polymers were added in the crystallization condition [4,5,6,7,8,9,10,11]. Kato and coworkers reported the preparation of calcium carbonate thin film by utilizing an insoluble polymer matrix as the substrate and soluble acidic polymer as the additive [12,13,14,15]. Chujo and coworkers studied the control of crystal structure and particle size of calcium carbonate by employing poly(amidoamine) (PAMAM)
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