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Substrate effect on nanoporous structure of silica wires by channel-confined self-assembly of block-copolymer and sol-gel precursors

  • Received: 26 May 2015 Accepted: 16 September 2015 Published: 22 September 2015
  • Nanoporous silica wires of various wire diameters were developed by space-confined molecular self-assembly of triblock copolymer ethylene/propylene/ethylene (P123) and silica alkoxide precursor (tetraethylorthosilicate, TEOS). Two distinctive hard-templating substrates, anodized aluminum oxide (AAO) and track-etched polycarbonate (EPC), with channel diameters in the range between 10 nm and 200 nm were employed for space-confinement of soft molecular self-assembly driven by the block-copolymer microphase separation. It was observed in the scanning and transmission electron microscope (STEM) studies that the substrate geometry and material characteristics had pronounced effects on the structure and morphology of the silica nanowires. A “substrate wall effect” was proposed to explain the ordering and orientation of the intra-wire mesostructure. Circular and spiral nanostructures were found only in wires formed in AAO substrate, not in EPC. Pore-size differences and distinctive wall morphologies of the nanowires relating to the substrates were discussed. It was shown that the material and channel wall characteristics of different substrates play key roles in the ordering and morphology of the intra-wire nanostructures.

    Citation: Michael Z. Hu, Peng Lai. Substrate effect on nanoporous structure of silica wires by channel-confined self-assembly of block-copolymer and sol-gel precursors[J]. AIMS Materials Science, 2015, 2(4): 346-355. doi: 10.3934/matersci.2015.4.346

    Related Papers:

  • Nanoporous silica wires of various wire diameters were developed by space-confined molecular self-assembly of triblock copolymer ethylene/propylene/ethylene (P123) and silica alkoxide precursor (tetraethylorthosilicate, TEOS). Two distinctive hard-templating substrates, anodized aluminum oxide (AAO) and track-etched polycarbonate (EPC), with channel diameters in the range between 10 nm and 200 nm were employed for space-confinement of soft molecular self-assembly driven by the block-copolymer microphase separation. It was observed in the scanning and transmission electron microscope (STEM) studies that the substrate geometry and material characteristics had pronounced effects on the structure and morphology of the silica nanowires. A “substrate wall effect” was proposed to explain the ordering and orientation of the intra-wire mesostructure. Circular and spiral nanostructures were found only in wires formed in AAO substrate, not in EPC. Pore-size differences and distinctive wall morphologies of the nanowires relating to the substrates were discussed. It was shown that the material and channel wall characteristics of different substrates play key roles in the ordering and morphology of the intra-wire nanostructures.


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    [1] Sanchez C, Julian B, Belleville P, et al. (2005) Applications of hybrid organic-inorganic nanocomposites. J Mater Chem 15: 3559-3592. doi: 10.1039/b509097k
    [2] Wu Y, Livneh T, Zhang YX, et al. (2004) Templated Synthesis of Highly Ordered Mesostructured Nanowires and Nanowire Arrays. Nano Lett 4: 2337-2342. doi: 10.1021/nl048653r
    [3] Kresge CT, Leonowicz ME, Roth WJ, et al. (1992) Ordered mesoporous molecular sieves synthesized by a liquid-crystal template mechanism. Nature 359: 710-712. doi: 10.1038/359710a0
    [4] Göltner CG, Antonietti M (1997) Mesoporous materials by templaling of liquid crystalline phases. Adv Mater 9: 431-436. doi: 10.1002/adma.19970090516
    [5] Wang J, Tsung CK, Hayward RC, et al. (2005) Single-crystal mesoporous silica ribbons. Angew Chem 117:332-336. doi: 10.1002/ange.200461623
    [6] Brinker CJ, Lu Y, Sellinger A, et al. (1999) Evaporation-induced self-assembly: Nanostructures made easy. Adv Mater 11: 579-585. doi: 10.1002/(SICI)1521-4095(199905)11:7<579::AID-ADMA579>3.0.CO;2-R
    [7] Kickelbick G (2005) Formation of Hexagonal Mesoporous Silica in Submicrometer Channels. Small 1: 168-170. doi: 10.1002/smll.200400098
    [8] Ku AY, Taylor ST, Loureiro SM (2005) Mesoporous silica composites containing multiple regions with distinct pore size and complex pore organization. J Am Chem Soc 127: 6934-6935.
    [9] Platschek B, Petkov N, Bein T (2006) Tuning the Structure and Orientation of Hexagonally Ordered Mesoporous Channels in Anodic Alumina Membrane Hosts: A 2D Small-Angle X-ray Scattering Study. Angew Chem Int Ed 45: 1134-1138. doi: 10.1002/anie.200503301
    [10] Yao BD, Fleming D, Morris MA, et al. (2004) Structural Control of Mesoporous Silica Nanowire Arrays in Porous Alumina Membranes. Chem Mater 16: 4851-4855. doi: 10.1021/cm0487425
    [11] Cott DJ, Petkov N, Morris MA, et al. (2006) Preparation of oriented mesoporous carbon nano-filaments within the pores of anodic alumina membranes. J Am Chem Soc 128: 3920-3921. doi: 10.1021/ja058441b
    [12] Wu Y, Cheng G, Katsov K, et al. (2004) Composite mesostructures by nano-confinement. Nature Mater 3: 816-822. doi: 10.1038/nmat1230
    [13] Liang Z, Susha AS (2004) Mesostructured Silica Tubes and Rods by Templating Porous Membranes. Chem Eur J 10: 4910-4914. doi: 10.1002/chem.200400005
    [14] Lai P, Hu MZ, Shi D, et al. (2008) STEM characterization on silica nanowires with new mesopore structures by space-confined self-assembly within nano-scale channels. Chem Comm 2008: 1338-1340.
    [15] Hu MZ, Shi D, Blom DA (2014) Nanostructured Mesoporous Silica Wires with Intrawire Lamellae via Evaporation-Induced Self-Assembly in Space-Confined Channels. J Nanomater 2014, Article ID 932160.
    [16] Israelachvili JN (1992) Intermolecular & Surface Forces (second edition), Academic Press: San Diego, USA.
    [17] Lu Y, Ganguli R, Drewien CA, et al. (1997) Continuous formation of supported cubic and hexagonal mesoporous films by sol-gel dip-coating. Nature 389: 364-368. doi: 10.1038/38699
    [18] Yamaguchi A, Uejo F, Yoda T, et al. (2004) Self Assembly of Silica-Surfactant Nanocomposite in Porous Alumina Membrane. Nature Mater 3: 337-341. doi: 10.1038/nmat1107
    [19] Soni SS, Brotons G, Bellour M, et al. (2006) Quantitative SAXS Analysis of the P123/Water/Ethanol Ternary Phase Diagrams. J Phys Chem B 110: 15157-15165. doi: 10.1021/jp062159p
    [20] Yu CZ, Fan J, Tian BZ, et al. (2003) Synthesis of mesoporous silica from commercial poly(ethylene oxide)/poly(butylene oxide) copolymers: Toward the rational design of ordered mesoporous materials. J Phys Chem B 107: 13368-13375. doi: 10.1021/jp027046u
    [21] Holmqvist P, Alexandridis P, Lindman B (1998) Modification of the microstructure in block copolymer-water-“oil” systems by varying the copolymer composition and the “oil” type: Small-angle X-ray scattering and deuterium-NMR investigation. J Phys Chem B 102: 1149-1158. doi: 10.1021/jp9730297
    [22] Xiang H, Shin K, Kim T, et al. (2005) The influence of confinement and curvature on the morphology of block copolymers. J Poly Sci Part B-Poly 43: 3377-3383. doi: 10.1002/polb.20641
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