Vol.11 no.3 2019

Research paper : Challenge towards synthesis of non-silica-based hybrid mesoporous materials (T. KIMURA)−120−Synthesiology - English edition Vol.11 No.3 (2018) synthesis of mesoporous aluminum phosphonates was researched using a spray-drying process that is known as a synthesis method including a solvent evaporation process similar to film synthesis,[23][24] and the understanding of this process was advanced.[25] Therefore, according to the demand of application development, it will become possible to provide various mesoporous metal phosphonates that were designed recently or will be designed in the future, as powder samples.The “reactivity control of phosphonate compounds” was a breakthrough to greatly advance this research. One of the future prospects that emerged from the study is the expansion of the types of organic groups in the framework. Not limited to the organic groups seen in commercial phosphonate compounds, it is necessary to design molecular structures of bridged organic groups assuming all sorts of chemical approaches, including organic synthesis of phosphonate esters with desired bridged organic groups as well as addition of functional groups to phosphonate esters. I believe functional design using organic groups in the framework will be done with future orientation. In this research approach, reactivity can be controlled continuously through partial acid treatment of phosphonate esters. However, I do not think this is a universal method for all inorganic materials. Moreover, I have not reached the level of synthesis considering crystallinity of inorganic frameworks of mesoporous materials, and new ideas are necessary for its realization.It is not certain that the concept of continuous reactivity control can be introduced to the side of inorganic species. In the future, it is necessary to develop synthesis methods for diverse mesoporous materials, being mindful not only of understanding the reactivity of inorganic materials during the early stages of reaction but also of how to control the reactivity of inorganic species that is taking place continuously in solution. Moreover, I hope to advance to a synthesis method that allows maximization of the crystalline property of inorganic frameworks. By doing so, the diversification of inorganic species to this point can be positioned as efforts toward “designing the pore environment.” “Functional design derived from inorganic species” can be added to future design guidelines. Simple usages of mesoporous metal phosphonates are summarized in several papers.[26]-[29] In the sense of future-oriented material design, metal phosphate and its metal oxides are predicted to show similar properties that derive from the property of metal species. Therefore, in the future, I wish to discuss possibilities for materials that act as alternatives in application development for non-silica-based oxide materials of which achievement of mesoporosity and powder synthesis technologies are currently not sufciently established.AcknowledgementIn conducting this research, I had pride of a synthesis researcher and the will to succeed despite insufficient funding. Therefore, I made sure my papers were published in illustrious international academic journals, and continued to generate steady research results, sometimes through collaboration with exterior research institutions. My efforts have come to fruition. Very recently, I was able to greatly advance this research, through the support of the Grant-in-Aid for Scientific Research (B), “Development of a precise synthesis technology for non-silica-based hybrid mesoporous materials by the molecular structure design (FY 2014–2016)” Japan Society for the Promotion of Science (JSPS KAKENHI Grant No. 26288110). I am grateful for this opportunity.References[1]T. Yanagisawa, T. Shimizu, K. Kuroda and C. Kato:The preparation of alkyltrimethylammonium-kanemitecomplexes and their conversion to microporous materials,Bull. Chem. Soc. Jpn., 63 (4), 988–992 (1990).[2]M. E. Davis: Ordered porous materials for emergingapplications, Nature, 417 (6891), 813–821 (2002).[3]C. T. Kresge, M. E. Leonowicz, W. J. Roth, J. C. Vartuli and J.S.Beck: Ordered mesoporous molecular sieves synthesizedby a liquid-crystal template mechanism, Nature, 359 (6397),710–712 (1992).[4]Q. Huo, D. I. Margolese, U. Ciesla, D. G. Demuth, P. Feng,T. E. Gier, P. Sieger, A. Firouzi, B. 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Goto, S. Shirai, Y.Yamada, N. Mizoshita, T. Tani, W. J. Chun, S. Muratsugu,M.Tada, A. Fukuoka and S. Inagaki: A solid chelatingligand: periodic mesoporous organosilica containing 2,2'-bipyridine within the pore walls, J. Am. Chem. Soc., 136(10), 4003–4011 (2014).[11]Y. Lu, R. Ganguli, C. A. Drewien, M. T. Anderson, C. J.Brinker, W. Gong, Y. Guo, H. Soyez, B. Dunn, M. H. Huangand J. I. Zink: Continuous formation of supported cubic andhexagonal mesoporous lms by sol-gel dip-coating, Nature,389 (6649), 364–368 (1997).[12]Y. Lu, H. Fan, A. Stump, T. L. Ward, T. Rieker and C. J.Brinker: Aerosol-assisted self-assembly of mesostructuredspherical nanoparticles, Nature, 398 (6724), 223–226 (1999).

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