Regioselectively Ordered Silica Nanotubes by Molecular Templating

Zollfrank, Cordt; Scheel, Hanne; Greil, Peter

doi:10.1002/adma.200601548

Cited by 46 publications

(37 citation statements)

References 28 publications

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“…Earlier efforts were mainly devoted to the research of carbon nanotubes, metals and II-VI semiconductors (Schonenberger et al 1997;Zhang et al 2000). Recently inorganic nanotubes derived from non-layered structures such as SiO 2 , Al 2 O 3 , TiO 2 , Ga 2 O 3 , CdSe, CdS, ZnS have attracted intense interest for their excellent performance (Nakamura and Matsui 1995;Hoyer 1996;Cheng and Samulski 2001;Xiang et al 2003;Golberg et al 2005;Guo et al 2005;Zollfrank et al 2007). Compared with other tubular nanomaterials, pure silica nanotubes not only realize functionalization on the outer and inner walls more easily, but also show exceptional applications in bioanalysis, catalysis and optic devices.…”

Section: Introductionmentioning

confidence: 98%

Novel fabrication of silica nanotubes using multi-walled carbon nanotubes as template

Yin

Liu

2010

Bull Mater Sci

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Silica nanotubes were synthesized using multi-walled carbon nanotubes (MWCNTs) as template. The as-obtained samples were characterized by infrared spectroscopy (FTIR), X-ray diffraction (XRD), transmission electron microscopy (TEM), field emission scanning electron microscope (FE-SEM) and photoluminescent (PL) spectroscopy. The results indicate that the thickness of the outer walls is about 10 nm and the inner diameter is completely dependent on the size of MWCNTs. The as-fabricated silica nanotubes emit a strong violet light under excitation of 250 nm.

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Section: Introductionmentioning

confidence: 98%

Novel fabrication of silica nanotubes using multi-walled carbon nanotubes as template

Yin

Liu

2010

Bull Mater Sci

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“…The general class of nanocomposite inorganic/organic materials is a fast growing area of research (Zollfrank et al 2007). These new materials combine inorganic nanoparticles such as silica and various polymers, including the most abundant natural polymer, cellulose.…”

Section: Introductionmentioning

confidence: 99%

Bacterial Cellulose and Silica Hybrid Reinforcements in Poly-(vinylidene fluoride) Composite Membranes

Zhao¹,

Yu²

2014

BioResources

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Poly-(vinylidene fluoride) (PVDF), which has a low surface energy, is a common material used for ultrafiltration (UF) membranes. Bacterial cellulose (BC) contains a large number of hydroxyl groups, which has a strong water holding capacity. It can improve the hydrophilicity of PVDF. By means of in-situ composite preparation, with the introduction of tetraethoxysilane (TEOS) as silicon source from the outside of BC and polymerizing, hybrid reinforcing material comprised of BC and silica (BC/SiO2) was achieved which were catalyzed by different acids. After that, by means of a phase separation method with PVDF, composite membranes (PVDF/BC/SiO2) were prepared. Visible spectrophotometry, thermogravimetric analysis (TGA), Fourier transform infrared spectroscopy (FTIR), and scanning electron microscopy (SEM) were used to investigate the characteristic of BC/SiO2 hybrids. The structure and properties of composite membranes were also investigated. After catalysis by acid, SiO2 particles uniformly adhered to the surface of BC fibers, which resulted in small pores being formed preferentially in the interface of PVDF composite membranes, while reducing the finger-like pores. At the same time the retention of the composite membranes were improved. So both the properties and structure were improved due to the presence of certain BC/SiO2 hybrid reinforcements.

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“…Among the nanotubes made of different materials such as metal, silica, and semiconductor, silica nanotubes are especially useful in nanobiotechnology applications due to their intrinsic biocompatibility and simple chemical modification. [1][2][3][4] Compared with silica nanoparticles (NPs), silica nanotubes have inner and outer surfaces that can be independently modified with functional groups, [5] leading to the development of multifunctionalized nanotubes for potential applications in drug and gene delivery, single molecular detection, single-molecule sensing, and bioseparation. [6][7][8][9][10][11] To date, two main templating methods have been used to fabricate silica nanotubes.…”

Section: Introductionmentioning

confidence: 99%

Genetically Modifiable Flagella as Templates for Silica Fibers: From Hybrid Nanotubes to 1D Periodic Nanohole Arrays

Wang

Liu

Mao

2008

Adv Funct Materials

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Bacterial flagellum is a protein nanotube that is helically self‐assembled from thousands of a protein subunit called flagellin. The solvent‐exposed domain of each flagellin on the flagella is genetically modifiable, in that a foreign peptide can be genetically inserted into this domain, leading to the high‐density display of this foreign peptide on the surface of flagella. In this work, wild‐type and genetically engineered flagella (inner diameter of ∼2 nm and outer diameter of ∼14 nm) detached from the surface of Salmonella bacterial cells are used as templates to site‐specifically form silica sheaths on the flagellar surface, resulting in the formation of double‐layered silica/flagella nanotubes. The flagella templates inside the silica/flagella nanotubes can be removed to obtain silica nanotubes by calcining the nanotubes at high temperature (550°C). Further calcination of the silica nanotubes at a higher temperature (800 °C) leads to the formation of a periodic nanohole array along the silica fibers with a center‐to‐center nanohole spacing of ∼79 nm. It is demonstrated that the double‐layered silica‐flagella nanotubes can be used for selective CdTe quantum dot uptake into the inner channels or selective Au nanoparticle coating on the outer wall of the nanotubes due to the different chemistry between inner flagellum core (protein) and outer silica wall of the nanotubes. It is also found that flagella displaying different peptides result in different morphologies of the silica nanotubes. This work suggests that the monodisperse diameter and genetically tunable surface chemistry of the flagella can be exploited for the fabrication of silica nanotubes with uniform diameter and controllable morphologies as well as silica nanofibers decorated with periodic nanohole arrays.

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Regioselectively Ordered Silica Nanotubes by Molecular Templating

Cited by 46 publications

References 28 publications

Novel fabrication of silica nanotubes using multi-walled carbon nanotubes as template

Novel fabrication of silica nanotubes using multi-walled carbon nanotubes as template

Bacterial Cellulose and Silica Hybrid Reinforcements in Poly-(vinylidene fluoride) Composite Membranes

Genetically Modifiable Flagella as Templates for Silica Fibers: From Hybrid Nanotubes to 1D Periodic Nanohole Arrays

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