Critical Roles of Cationic Surfactants in the

0 downloads 0 Views 3MB Size Report
Figure S6 Variation in the appearances of solutions prepared form (a) tetraethoxysilane. “MSN-0.50-as”, and (b) bistriethoxysilylethenylene “MSqN-0.50-as” as a ...

Supporting Information

Critical Roles of Cationic Surfactants in the Preparation of Colloidal Mesostructured Silica Nanoparticles: Control of Mesostructure, Particle Size, and Dispersion

Hironori Yamada,† Chihiro Urata,† Sayuri Higashitamori,† Yuko Aoyama,† Yusuke Yamauchi,‡,§ and Kazuyuki Kuroda*†,Ψ †Department of Applied Chemistry, Faculty of Science and Engineering, Waseda University, Ohkubo 3-4-1, Shinjuku-ku, Tokyo, 169-8555, Japan, ‡World Premier International (WPI) Research Center, International Center for Materials Nanoarchitectonics (MANA), National Institute for Materials Science (NIMS), 1-1 Namiki, Tsukuba, 305-0044, Japan, §Precursory Research for Embryonic Science and Technology (PRESTO), Japan Science and Technology Agency (JST), 4-1-8 Honcho, Kawaguchi, Saitama, 332-0012, Japan, ΨKagami Memorial Research Institute for Materials Science and Technology, Waseda University, Nishiwaseda 2-8-26, Shinjuku-ku, Tokyo, 169-0051, Japan

Contents Figure S1 Variation in the enlarged TEM images of (a) MSN-0.020-asP, (b) MSN-0.063-asP, and (c) MSN-0.50-asS. Figure S2 Variation in the appearances of the precipitates of C16TMABr crystals after cooling, with different molar ratios R of C16TMABr to Si. Figure S3 Variation in the appearances of solutions prepared from C16PyCl with different molar ratios to Si. Figure S4 Variation in the TEM images of the precipitates and supernatants of solutions prepared from C16PyCl with different molar ratios, R, of the surfactants to Si. Figure S5 Variation in the TEM images of the precipitates and supernatants of solutions prepared from surfactants with different alkyl chain lengths. Figure S6 Variation in the appearances of solutions prepared form (a) tetraethoxysilane “MSN-0.50-as”, and (b) bistriethoxysilylethenylene “MSqN-0.50-as” as a Si source. Scheme S1 The separation process of composite and free C16PyCl by centrifugation with a membrane filter.

1

Figure S1. Variation in the enlarged TEM images of (a) MSN-0.020-asP, (b)

MSN-0.063-asP, and (c) MSN-0.50-asS, where S and P denote supernatants and precipitates, respectively.

Figure S2. Variation in the appearances of the precipitates of C16TMABr crystals after cooling, with different molar ratios R of C16TMABr to Si. The values of R are (a) 0.13, (b) 0.25, (c) 0.38, and (d) 0.50, respectively.

2

Figure S3. Variation in the appearances of solutions prepared from C16PyCl with different molar ratios to Si: (a) 0.050, (b) 0.086, (c) 0.13, (d) 0.19, (e) 0.26, (f) 0.32, (g) 0.39, (h) 0.45, and (i) 0.50.

Figure S4. Variation in the TEM images of the precipitates and supernatants of solutions prepared from C16PyCl with different molar ratios, R, of the surfactants to Si. The values of R are (a) 0.050, (b) 0.086, (c) 0.13, (d) 0.19, (e) 0.26, (f) 0.32, (g) 0.39, (h) 0.45, and (i) 0.50, respectively. (a) and (b) are the images of the precipitates and (c) – (i) are the images of the supernatants.

3

Figure S5. Variation in the TEM images of the precipitates and supernatants of solutions prepared from surfactants with different alkyl chain lengths: (a) C10-0.50, (b) C12-0.50, (c) C14-0.50, (d) C16-0.50, and (e) C18-0.50. (a) represents the image of the precipitates, and (b) – (e) represent those of the supernatants.

Figure S6. Variation in the appearances of solutions prepared form (a) tetraethoxysilane “MSN-0.50-as”, and (b) bistriethoxysilylethenylene “MSqN-0.50-as” as a Si source. The number indicates the pH value of the solution, which is adjusted from ca. 3 to 9 after the preparation of colloidal mesostructured nanoparticles.

4

Scheme S1. The separation process of composite and free C16PyCl by centrifugation with a membrane filter.

5

Suggest Documents