Two-dimensional crystals of mesoporous silica SBA-15 nanosheets with perpendicular and open channels

Yeh, Yi‐Qi; Tang, Chengzhou; Mou, Chung‐Yuan

doi:10.1063/1.4897203

Cited by 11 publications

(6 citation statements)

References 38 publications

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“…Thus, it explains the seemingly indifference to the nature of surface. In a way, the mechanism is similar to the one for the free-standing SBA-15 platelet in our previous work where the confining media was surfactant bilayers instead of oil . Here, the oil can wet and spread on most kind of substrates.…”

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confidence: 69%

“…Preferential interaction of either the micelle or silica with one of the interfaces would make a parallel orientation energetically favorable. Recognizing this, Mou and co-workers were able to make free-standing platelets of SBA-15 with vertical channels by confining P123 and silica precursor between symmetric bilayers of a mixed cationic/anionic surfactant system of CTAB and SDS . For films on substrates, the problem of dissimilar interfaces has been found in thin films of cylinder-forming block copolymers .…”

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confidence: 99%

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A General Method for Growing Large Area Mesoporous Silica Thin Films on Flat Substrates with Perpendicular Nanochannels

et al. 2015

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Here we introduce a new synthetic approach to grow mesoporous silica thin films with vertical mesochannels on centimeter-sized substrates via an oil-induced co-assembly process. Adding an oil, i.e., decane, into a CTAB-EtOH-TEOS ammonia solution leads to thin-film formation of mesoporous silica of controlled thickness between 20 and 100 nm with vertical mesochannels on various surfaces. The vertical mesoporous channels were evidenced by grazing incidence small-angle X-ray scattering (GISAXS), scanning electron microscopy (SEM), and transmission electron microscopy (TEM) characterizations. Decane played two roles: (a) as a pore expansion agent (up to 5.7 ± 0.5 nm) and (b) inducing vertically oriented hexagonal mesophases of micelle-silica composite. The production of periodic and vertical nanochannels is very robust, over many different substrate surfaces (from silicon to polystyrene), various silica precursors (TEOS, fumed silica, or zeolite seed), and many oils (decane, petroleum ether, or ethyl acetate). This wide robustness in the formation of vertical nanophases is attributed to a unique mechanism of confined synthesis of surfactant-silicate between two identical thin layers of oils on a substrate.

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A General Method for Growing Large Area Mesoporous Silica Thin Films on Flat Substrates with Perpendicular Nanochannels

et al. 2015

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“…23−26 These solids are quite stable in water, which could make them ideal candidates for ground water purification. Among them, the mesoporous SBA-15 27−30 material is often employed as a support to enhance the material properties due to its structural features such as high surface area with a thick pore wall, uniformly ordered pore channels, high thermal stability, optical transparency in the visible region, and high biocompatibility. 31 Due to such beneficial factors, it is widely explored in adsorption, 32 catalysis, 33,34 optoelectronics, 35 and optical sensors.…”

Section: Introductionmentioning

confidence: 99%

“…Porous nanomaterials with pore dimensions varying from sub-nanometer (microporous) to several nanometer (mesoporous) length scales are intensively studied over the years due to their potential in several frontline application areas and their reusability. − These solids are quite stable in water, which could make them ideal candidates for ground water purification. Among them, the mesoporous SBA-15 − material is often employed as a support to enhance the material properties due to its structural features such as high surface area with a thick pore wall, uniformly ordered pore channels, high thermal stability, optical transparency in the visible region, and high biocompatibility . Due to such beneficial factors, it is widely explored in adsorption, catalysis, , optoelectronics, and optical sensors .…”

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confidence: 99%

Organically Functionalized Mesoporous SBA-15 Type Material Bearing Fluorescent Sites for Selective Detection of Hg^II from Aqueous Medium

et al. 2019

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Hg(II) contamination in water resources is one of the major health issues in keeping the purity standard of the municipal water supply. Herein, we report a new mesoporous sensor probe material SBA-ABZ-PEA having a 2D-hexagonally ordered mesoporous framework bearing covalently bonded fluorescent sites, and this has been synthesized through a two-step post-synthesis grafting route. A pure silica mesoporous SBA-15 material has been functionalized with (3-chloropropyl)triethoxysilane (ClPTES) to obtain chloro-functionalized SBA-15, which was further reacted with 4-aminobenzaldehyde followed by treatment with 2-(2-pyridyl)-ethylamine resulting in functionalized 2D-hexagonal mesoporous sensor probe SBA-ABZ-PEA. Small angle PXRD, N2 adsorption/desorption, HRTEM, TGA, and FT-IR studies have been carried out to characterize these materials. Our experimental results suggested successful grafting of the organic moiety on the SBA-15 surface along with preservation of mesoporosity throughout the grafting process. Photoluminescence measurements were carried out in the aqueous suspension of SBA-ABZ-PEA in the presence of different metal cations, like NaI, MgII, AlIII, KI, CaII, MnII, CoII, CuII, ZnII, CdII, PbII, and HgII. This result revealed that, among the various metal-ions, the emission intensity of the mesoporous sensing probe material SBA-ABZ-PEA has been dramatically quenched in the presence of the HgII ion. To check the sensitivity of the sensor probe, the fluorescence emission was also studied in the presence of different concentrations of HgII ions. A perfect linear plot between the concentrations of HgII ions in the aqueous medium with their corresponding fluorescence intensities with a detection limit of 1.2 × 10–6 M has been observed.

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“…[13,14] Recently, mesoporous thin membranes have attracted growing interest due to their well-defined mesopores with diameters of 2 to 50 nm and wide applications in separations, electronics, biomedicine, and energy technologies. [15][16][17][18][19][20][21] Up to now, a variety of strategies have been developed toward the preparation of mesoporous silica thin films with vertical mesochannels, such as using modified surfaces, [22] ternary surfactant system, [23,24] confined effect, [25] epitaxial growth, [26,27] and anisotropic external-field assistance. [28][29][30][31] However, most of vertically oriented mesoporous silica thin films have small pore sizes, which cannot be applicable to most of colloidal nanocrystals and large biomolecules, such as proteins and DNA.…”

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Mesoporous Silica Thin Membranes with Large Vertical Mesochannels for Nanosize‐Based Separation

et al. 2017

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Membrane separation technologies are of great interest in industrial processes such as water purification, gas separation, and materials synthesis. However, commercial filtration membranes have broad pore size distributions, leading to poor size cutoff properties. In this work, mesoporous silica thin membranes with uniform and large vertical mesochannels are synthesized via a simple biphase stratification growth method, which possess an intact structure over centimeter size, ultrathin thickness (≤50 nm), high surface areas (up to 1420 m g ), and tunable pore sizes from ≈2.8 to 11.8 nm by adjusting the micelle parameters. The nanofilter devices based on the free-standing mesoporous silica thin membranes show excellent performances in separating differently sized gold nanoparticles (>91.8%) and proteins (>93.1%) due to the uniform pore channels. This work paves a promising way to develop new membranes with well-defined pore diameters for highly efficient nanosize-based separation at the macroscale.

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Two-dimensional crystals of mesoporous silica SBA-15 nanosheets with perpendicular and open channels

Cited by 11 publications

References 38 publications

A General Method for Growing Large Area Mesoporous Silica Thin Films on Flat Substrates with Perpendicular Nanochannels

A General Method for Growing Large Area Mesoporous Silica Thin Films on Flat Substrates with Perpendicular Nanochannels

Organically Functionalized Mesoporous SBA-15 Type Material Bearing Fluorescent Sites for Selective Detection of Hg^II from Aqueous Medium

Mesoporous Silica Thin Membranes with Large Vertical Mesochannels for Nanosize‐Based Separation

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Two-dimensional crystals of mesoporous silica SBA-15 nanosheets with perpendicular and open channels

Cited by 11 publications

References 38 publications

A General Method for Growing Large Area Mesoporous Silica Thin Films on Flat Substrates with Perpendicular Nanochannels

A General Method for Growing Large Area Mesoporous Silica Thin Films on Flat Substrates with Perpendicular Nanochannels

Organically Functionalized Mesoporous SBA-15 Type Material Bearing Fluorescent Sites for Selective Detection of HgII from Aqueous Medium

Mesoporous Silica Thin Membranes with Large Vertical Mesochannels for Nanosize‐Based Separation

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Organically Functionalized Mesoporous SBA-15 Type Material Bearing Fluorescent Sites for Selective Detection of Hg^II from Aqueous Medium