Electron beam induced structural evolution in Fe3O4\SiO2 particles: A new route to obtain movable core structures

Lv, Baoliang; Xü, Yao; Wu, Dong; Sun, Yuhan

doi:10.1016/j.materresbull.2011.02.013

Cited by 5 publications

(4 citation statements)

References 29 publications

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“…The as-prepared ferrihydrite/SiO 2 composites were denoted as Fe-SiO 2 -x, where x (1, 3, and 5) denotes the aging time. Different from that of ferrihydrite, a broad shoulder centered at about 2q = 258, which was ascribed to amorphous SiO 2 , [37,38] was observed in the XRD patterns of Fe-SiO 2 -x (x = 1, 3, and 5). In the case of ferrihydrite, only two broad bands at about 358 and 618 appear in the pattern, thus featuring a typical two-line pattern of ferrihydrite.…”

Section: Resultsmentioning

confidence: 91%

“…[32] The broad peaks with weak intensities imply poor crystallinity of the ferrihydrite and/or small crystalline size. Different from that of ferrihydrite, a broad shoulder centered at about 2q = 258, which was ascribed to amorphous SiO 2 , [37,38] was observed in the XRD patterns of Fe-SiO 2 -x (x = 1, 3, and 5). On prolonging the aging time, the diffraction intensity of ferrihydrite decreased, whereas that of SiO 2 increased, thus indicating that a larger amount of SiO 2 was deposited over the surface of ferrihydrite.…”

Section: Resultsmentioning

confidence: 91%

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Microemulsion‐Assisted Preparation of a Mesoporous Ferrihydrite/SiO₂ Composite for the Efficient Removal of Formaldehyde from Air

Wang

Xiao

2013

Chemistry A European J

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Mesoporous ferrihydrite/SiO2 composites were synthesized according to a water-in-oil microemulsion method and characterized by X-ray diffraction, scanning electron microscopy, transmission electron microscopy, Fourier transform infrared spectroscopy, thermogravimetry, nitrogen-adsorption/desorption, and by X-ray photoelectron spectroscopy. The as-prepared porous ferrihydrite/SiO2 composites showed an excellent adsorption performance for formaldehyde (HCHO) removal from indoor air at ambient temperature. It was found that the aging time during the synthesis had a significant impact on the pore structure, surface area, and HCHO adsorption of these materials. The ferrihydrite/SiO2 composite that was aged for 3 h in the presence of tetraethyl orthosilicate (TEOS) exhibited a relatively high HCHO adsorption capacity, as well as good recyclability, which was attributed to a relatively large BET surface area, optimal pore size, a suitable Si/Fe atomic ratio, and a synergistic effect between ferrihydrite and SiO2. This work not only demonstrates that porous ferrihydrite/SiO2 composites can act as an efficient adsorbent toward HCHO, but suggests a new route for the rational design of cost-effective and environmentally benign adsorbents with high performance for indoor air purification.

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Section: Resultsmentioning

confidence: 91%

Section: Resultsmentioning

confidence: 91%

Microemulsion‐Assisted Preparation of a Mesoporous Ferrihydrite/SiO₂ Composite for the Efficient Removal of Formaldehyde from Air

Wang

Xiao

2013

Chemistry A European J

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“…Because of the wide range of important applications of MO NPs, different research groups are putting continuous efforts to achieve new or improved properties by changing the structure as well as proper combinations of materials. While analyzing the research papers on YS NPs of this category, it has been found that the core is mostly made of SiO 2 , 23,39,41,47,57,74,251,252 Fe 3 O 4 , 57,81,83,88,92,147,157,[180][181][182]184,[253][254][255] and TiO 2 ; 105 and at the same time the hollow shell structure is made of silica and metal (Mg, 157 Al, 92 Cu, 184 Ni 147 ) silicates. Based on these studies, these types of YS NPs are divided into magnetic and non-magnetic cores.…”

Section: Spherical Shape Ys Npsmentioning

confidence: 99%

Yolk/shell nanoparticles: classifications, synthesis, properties, and applications

2015

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Core/shell nanoparticles were first reported in the early 1990s with a simple spherical core and shell structure, but the area is gradually diversifying in multiple directions such as different shapes, multishells, yolk/shell etc., because of the development of different new properties of the materials, which are useful for several advanced applications. Among different sub-areas of core/shell nanoparticles, yolk/shell nanoparticles (YS NPs) have drawn significant attention in recent years because of their unique properties such as low density, large surface area, ease of interior core functionalization, a good molecular loading capacity in the void space, tunable interstitial void space, and a hollow outer shell. The YS NPs have better properties over simple core/shell or hollow NPs in various fields including biomedical, catalysis, sensors, lithium batteries, adsorbents, DSSCs, microwave absorbers etc., mainly because of the presence of free void space, porous hollow shell, and free core surface. This review presents an extensive classification of YS NPs based on their structures and types of materials, along with synthesis strategies, properties, and applications with which one would be able to draw a complete picture of this area.

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“…1f ) of Ni-SiO 2 -4 further reveals that the powders are composed of a flower-like hierarchical structure with self-assembled nanosheets, and cotton-like SiO 2 nanoflakelets are densely and evenly dispersed on the interstices of the aggregated Ni(OH) 2 nanosheets.Fig.2shows XRD patterns of the SiO 2 xerogel, Ni(OH) 2 and Ni-SiO 2 -x (x = 2, 4 and 6). In the case of the SiO 2 xerogel, a broad peak centered at 23°is attributed to amorphous SiO 2 36,37. For Ni(OH) 2 , the diffraction peaks located at 19°, 33°, 38°, 52°, 59°and 63°can be indexed to (001), (100), (101), (102), (110) and (111) planes of β-Ni(OH) 2 (JCPDS 01-1047), respectively.…”

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confidence: 99%

Microemulsion-assisted synthesis of hierarchical porous Ni(OH)2/SiO2 composites toward efficient removal of formaldehyde in air

et al. 2013

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Ni(OH)2/SiO2 composites with hierarchical flake-like nanostructures were synthesized using water-in-oil microemulsion and characterized by X-ray diffraction, thermogravimetry, Fourier transform infrared spectroscopy, scanning electron microscopy, transmission electron microscopy, nitrogen adsorption, and X-ray photoelectron spectroscopy. The as-prepared hierarchical porous Ni(OH)2/SiO2 composites show an excellent performance for formaldehyde (HCHO) removal in air at an ambient temperature. It was found that the aging time had a significant impact on the pore structure, surface area and HCHO adsorption. The Ni(OH)2/SiO2 composite aged for 4 h in the presence of tetraethyl orthosilicate (TEOS) exhibited a relatively high HCHO adsorption capacity as well as good recyclability compared with Ni(OH)2, attributed to a relatively large BET surface area, an optimal pore size, a suitable proportion between Ni(OH)2 and SiO2, and a synergistic effect between Ni(OH)2 and SiO2. The results from this work not only demonstrate that hierarchical porous Ni(OH)2/SiO2 composites can act as an efficient adsorbent toward HCHO in air, but suggest a new route for the rational design of cost-effective, high-performance and environmentally benign adsorbents for indoor air cleanup.

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Electron beam induced structural evolution in Fe3O4\SiO2 particles: A new route to obtain movable core structures

Cited by 5 publications

References 29 publications

Microemulsion‐Assisted Preparation of a Mesoporous Ferrihydrite/SiO₂ Composite for the Efficient Removal of Formaldehyde from Air

Microemulsion‐Assisted Preparation of a Mesoporous Ferrihydrite/SiO₂ Composite for the Efficient Removal of Formaldehyde from Air

Yolk/shell nanoparticles: classifications, synthesis, properties, and applications

Microemulsion-assisted synthesis of hierarchical porous Ni(OH)2/SiO2 composites toward efficient removal of formaldehyde in air

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Electron beam induced structural evolution in Fe3O4\SiO2 particles: A new route to obtain movable core structures

Cited by 5 publications

References 29 publications

Microemulsion‐Assisted Preparation of a Mesoporous Ferrihydrite/SiO2 Composite for the Efficient Removal of Formaldehyde from Air

Microemulsion‐Assisted Preparation of a Mesoporous Ferrihydrite/SiO2 Composite for the Efficient Removal of Formaldehyde from Air

Yolk/shell nanoparticles: classifications, synthesis, properties, and applications

Microemulsion-assisted synthesis of hierarchical porous Ni(OH)2/SiO2 composites toward efficient removal of formaldehyde in air

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Product

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Microemulsion‐Assisted Preparation of a Mesoporous Ferrihydrite/SiO₂ Composite for the Efficient Removal of Formaldehyde from Air

Microemulsion‐Assisted Preparation of a Mesoporous Ferrihydrite/SiO₂ Composite for the Efficient Removal of Formaldehyde from Air