Open Access Nano Express

A combination of hard and soft templating for the fabrication of silica hollow microcoils with nanostructured walls

Carlos Rodriguez-Abreu1*, Neus Vilanova2, Conxita Solans2, Masaki Ujihara3, Toyoko Imae3, Arturo López-Quintela4 and Seiji Motojima5

1 International Iberian Nanotechnology Laboratory (INL), Av. Mestre José Veiga, Braga, 4715-310, Portugal

2 Instituto de Química Avanzada de Cataluña. Consejo Superior de Investigaciones Científicas (IQAC-CSIC), Jordi Girona 18-26, Barcelona, 08034, Spain

3 Graduate Institute of Engineering, National Taiwan University of Science and Technology, 43 Keelung Road, Section 4, Taipei, Taiwan

4 Departamento de Química Física, Facultad de Química, Universidad de Santiago de Compostela, Santiago de Compostela, 15782, Spain

5 Toyota Physical & Chemical Research Institute, Nagakute, Aichi, 480-1192, Japan

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Nanoscale Research Letters 2011, 6:330  doi:10.1186/1556-276X-6-330

Published: 13 April 2011

Additional files

Additional file 1:

Figure S1. Pore size distribution of silica hollow microcoils. The initial weight ratios for preparation were CTAB/NH3(aq.)/CMC-COOH/TEOS = 13.9/70.4/0.6/15.1. The distribution is estimated from nitrogen sorption measurements using the Barret-Joyner-Halenda (BJH) method. Figure S2. SAXS spectra of (a) CMC-COOH, (b) hollow silica microcoils prepared with initial CTAB/NH3(aq.)/CMC-COOH/TEOS weight ratios of 13.9/70.4/0.6/15.1. The numbers indicate the peak position ratios corresponding to a hexagonal lattice. (c) Hollow silica microcoils prepared with initial CTAB/NH3(aq.)/CMC-COOH/TEOS weight ratios of 8.1/85.0/2.4/4.5. Figure S3. UV-vis spectra of PDI aqueous solutions before contact (continuous line) and after 1 h contact (dashed line) with CMC-COOHs. The decrease in absorbance is due to adsorption of PDI molecules on the surface of CMC-COOHs. Figure S4. Fluorescence emission spectrum of of PDI on CMC-COOH after silica coating. The spectrum corresponds to a dispersion in ethanol measured in a 1-cm path length cuvette. Figure S5. UV-vis absorption spectra of neat PDI (continuous line) and PDI on CMC-COOH after silica coating (dashed line). Spectra correspond to dispersions in ethanol measured in 1-cm path length cuvettes.

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