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

Rodriguez-Abreu C, Vilanova N, Solans C, Ujihara M, Imae T, López-Quintela A, Motojima S - Nanoscale Res Lett (2011)

Bottom Line: Moreover, they have mesoporous walls (pore size ≈ 3 nm) with some domains where pores are ordered in a hexagonal array, originated from surfactant micelles.The obtained silica microcoils also show preferential adsorption of cationic fluorescent dyes.A mechanism for the formation of silica microcoils is proposed.

View Article: PubMed Central - HTML - PubMed

Affiliation: International Iberian Nanotechnology Laboratory (INL), Av, Mestre José Veiga, Braga, 4715-310, Portugal. crodriguez@inl.int.

ABSTRACT
Hollow silica microcoils have been prepared by using functionalized carbon microcoils as hard templates and surfactant or amphiphilic dye aggregates as soft templates. The obtained materials have been characterized by electron and optical microscopy, nitrogen sorption and small angle X-ray scattering. The obtained hollow microcoils resemble the original hard templates in shape and size. Moreover, they have mesoporous walls (pore size ≈ 3 nm) with some domains where pores are ordered in a hexagonal array, originated from surfactant micelles. The obtained silica microcoils also show preferential adsorption of cationic fluorescent dyes. A mechanism for the formation of silica microcoils is proposed.

No MeSH data available.


Related in: MedlinePlus

Visible and fluorescent microscopic images of hollow silica microcoils prepared using CTAB after soaking them in an aqueous solution of rhodamine B.
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Figure 4: Visible and fluorescent microscopic images of hollow silica microcoils prepared using CTAB after soaking them in an aqueous solution of rhodamine B.

Mentions: The dye adsorption properties of silica hollow microcoils were tested. As can be seen in Figure 4, the microcoils pre-soaked in a cationic dye (rhodamine B) solution are fluorescent namely, the dye strongly adsorbs on the surface of silica microcoil, indicating that the surface is negatively charged, as expected from the high-pH synthesis conditions. On the other hand, no fluorescence was emitted from a sample pre-soaked with an anionic dye (e.g. fluorescein), since there is no charge matching and hence no adsorption of the anionic dye on the microcoils.


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

Rodriguez-Abreu C, Vilanova N, Solans C, Ujihara M, Imae T, López-Quintela A, Motojima S - Nanoscale Res Lett (2011)

Visible and fluorescent microscopic images of hollow silica microcoils prepared using CTAB after soaking them in an aqueous solution of rhodamine B.
© Copyright Policy - open-access
Related In: Results  -  Collection

License
Show All Figures
getmorefigures.php?uid=PMC3211418&req=5

Figure 4: Visible and fluorescent microscopic images of hollow silica microcoils prepared using CTAB after soaking them in an aqueous solution of rhodamine B.
Mentions: The dye adsorption properties of silica hollow microcoils were tested. As can be seen in Figure 4, the microcoils pre-soaked in a cationic dye (rhodamine B) solution are fluorescent namely, the dye strongly adsorbs on the surface of silica microcoil, indicating that the surface is negatively charged, as expected from the high-pH synthesis conditions. On the other hand, no fluorescence was emitted from a sample pre-soaked with an anionic dye (e.g. fluorescein), since there is no charge matching and hence no adsorption of the anionic dye on the microcoils.

Bottom Line: Moreover, they have mesoporous walls (pore size ≈ 3 nm) with some domains where pores are ordered in a hexagonal array, originated from surfactant micelles.The obtained silica microcoils also show preferential adsorption of cationic fluorescent dyes.A mechanism for the formation of silica microcoils is proposed.

View Article: PubMed Central - HTML - PubMed

Affiliation: International Iberian Nanotechnology Laboratory (INL), Av, Mestre José Veiga, Braga, 4715-310, Portugal. crodriguez@inl.int.

ABSTRACT
Hollow silica microcoils have been prepared by using functionalized carbon microcoils as hard templates and surfactant or amphiphilic dye aggregates as soft templates. The obtained materials have been characterized by electron and optical microscopy, nitrogen sorption and small angle X-ray scattering. The obtained hollow microcoils resemble the original hard templates in shape and size. Moreover, they have mesoporous walls (pore size ≈ 3 nm) with some domains where pores are ordered in a hexagonal array, originated from surfactant micelles. The obtained silica microcoils also show preferential adsorption of cationic fluorescent dyes. A mechanism for the formation of silica microcoils is proposed.

No MeSH data available.


Related in: MedlinePlus