NMR Imaging and Solid State High Resolution NMR Studies of Materials ; Properties and Internal Structural Changes in Materials.

材料的核磁共振成像和固态高分辨率核磁共振研究；

• 批准号: 02453032
• 负责人: WATANABE Tokuko
• 金额: $ 4.54万
• 依托单位: Tokyo University of Fisheries.
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for General Scientific Research (B)
• 财政年份: 1990
• 资助国家: 日本
• 起止时间: 1990 至 1991
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/en/grant/KAKENHI-PROJECT-02453032/
• 关键词: NMR imaging; solid state MAS; NMR; Al-NMR; Si-NMR; Mullite; Polymer material; diffusion; ceramics; 膨潤; アルミノシリケ-ト; 固体高分解能NMR; ムライトプリカ-サ-

In the present investigation, a new approach in material sciences has been done by using NMR imaging and solid state high resolution NMR methods. NMR imaging technique was used as an invasively, and continuously analysing method of the internal structural changes of materials.New informations in the following four research projects were obtained ;1)The structural change of amorphous aluminosilicates in the process of calcination : (1)Amorphous aluminosilicate which was directly changed into mullite was proposed as the mullite precursor. (2)The mullite precursor changes from amorphous to andulsite-like structure and finally into mullite. (3)Alkaline metal(Li, Na, K)ions affect the mullite formation process.2)Imaging of diffusion processes of solvent in polymers : Polycarbonate and PMMA in aceton, DMSO, DMF and water were investigated. The swelling rate of solvent or the rate of solubility were determined.3)Intercalation into clay minerals : The adsorption of DPPH in the interlayer of sodium montmorillonite and saponite was investigated by ESR. The intercalation mechanism seemed to be different between them because of the distinction of expandability.4)Stability of five-coordinated Aluminium complexes : 5-coordinated AI complex, which is few in coordination chemistry of AI ion, was found in the calcinating process of aluminosilicates. NMR study of Aluminum complexes was planned additionally.

在目前的研究中，一个新的方法，在材料科学已经完成了使用核磁共振成像和固态高分辨率核磁共振方法。利用核磁共振成像技术作为一种侵入性的、连续的分析材料内部结构变化的方法，在以下四个研究项目中获得了新的信息：1）无定形铝硅酸盐在煅烧过程中的结构变化：（1）提出了无定形铝硅酸盐直接转变为莫来石作为莫来石的前驱体。（2）莫来石前驱体由无定形转变为类红柱石结构，最后转变为莫来石。（3）碱金属（Li、Na、K）离子对莫来石形成过程的影响。2）溶剂在聚合物中扩散过程的成像：研究了聚碳酸酯和聚甲基丙烯酸甲酯在丙酮、二甲基亚砜、二甲基甲酰胺和水中的扩散过程。3）插层作用：用ESR研究了DPPH在钠基蒙脱石和皂石层间的吸附。5配位铝配合物的稳定性：在铝硅酸盐的煅烧过程中，发现了铝离子配位化学中较少的5配位铝配合物。此外，还计划对铝配合物进行NMR研究。

项目成果

T. Yokoyama, K/Nishu, S. Torii, Y. Ikeda and T. Watanabe: "Mullite precursor I. Characterization of mullite precursor formed by adsorption of monosilicic acid on aluminium hydroxid." J. Am. Cer. Soc.

T. Yokoyama、K/Nishu、S. Torii、Y. Ikeda 和 T. Watanabe：“莫来石前体 I。通过氢氧化铝吸附单硅酸形成的莫来石前体的表征。”

T.Yokoyama,S.Kinoshita,H.Wakita and T.Watanabe: " ^<27>Al and ^<31>P NMR Study on the Interaction between AlーEDTA Complex and H_2PO_4 Ions in Aqueous Solution." Anal.Sci.,. 7S. 429-430 (1991)

T.Yokoyama、S.Kinoshita、H.Wakita 和 T.Watanabe：“Al-EDTA 配合物与 H_2PO_4 离子在水溶液中相互作用的 ^<27>Al 和 ^<31>P NMR 研究。” ，7S。429-430（1991）

T.Yokoyama,Y.Ikeda and T.Watanabe: "Comparison between 3/2 Mullite and 2/1 Mullite in Structure by 27ーAl and 29ーSi MAS/NMR." J.Am.Cer.Soc.

T.Yokoyama、Y.Ikeda 和 T.Watanabe：“通过 27ーAl 和 29ーSi MAS/NMR 比较 3/2 莫来石和 2/1 莫来石。”

T. Yokoyama, Y. Takahashi and T. Tarutani: "Retarding and accelerating effects of Aluminium on the growth of polysilicic acid particles." J. Colloid & Interface Sci.,. 141. 559-563 (1991)

T. Yokoyama、Y. Takahashi 和 T. Tarutani：“铝对聚硅酸颗粒生长的延迟和加速作用。”

T. Yokoyama, K. Nishu, Y. Ikeda and T. Watanabe: "Structural change from amorphous mullite precursor to 3/2 mullite in the thermal treatment process ; Study by solid state high resolution ^<27>Al and ^<29>Si NMR." J. Am. Cer. soc.

T. Yokoyama、K. Nishu、Y. Ikeda 和 T. Watanabe：“热处理过程中从非晶莫来石前驱体到 3/2 莫来石的结构变化；通过固态高分辨率研究 ^<27>Al 和 ^<29>