High-yield hydrothermal synthesis of mesoporous silica hollow capsules

Kato, Norihiro

doi:10.1016/j.micromeso.2015.08.015

Cited by 14 publications

(7 citation statements)

References 70 publications

(59 reference statements)

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“…Benefitting from the merits of low density, large specific surface area, the huge void space, special photoelectric properties and good biocompatibility 17 , hollow silica spheres (HSS) present promising application prospects in catalysis 18 , waste removal 19 , adsorption, storage 20 , and sustained/controlled release of agents with various functionalities 21 22 23 24 25 26 . Different methods have been employed to prepare HSS, including template-assisted synthesis 27 28 , self-templating method 29 30 , spray drying 31 32 and hydrothermal synthetic method 33 34 . Among them, templating method is one of the most commonly used approaches.…”

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confidence: 99%

Micelle-template synthesis of hollow silica spheres for improving water vapor permeability of waterborne polyurethane membrane

Bao

Wang

Kang

et al. 2017

Sci Rep

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Hollow silica spheres (HSS) with special interior spaces, high specific surface area and excellent adsorption and permeability performance were synthesized via micelle-template method using cetyl trimethyl ammonium bromide (CTAB) micelles as soft template and tetraethoxysilane (TEOS) as silica precursor. SEM, TEM, FT-IR, XRD, DLS and BET-BJH were carried out to characterize the morphology and structure of as-obtained samples. The results demonstrated that the samples were amorphous with a hollow structure and huge specific surface area. The growth of HSS was an inward-growth mechanism along template. Notably, we have provided a new and interesting fundamental principle for HSS materials by precisely controlling the ethanol-to-water volume ratio. In addition, the as-obtained HSS were mixed with waterborne polyurethane (WPU) to prepare WPU/HSS composite membrane. Various characterizations (SEM, TEM, FT-IR and TGA) revealed the morphology, polydispersity and adherence between HSS and WPU. Performance tests showed that the introduction of HSS can improve the water vapor permeability of composite membrane, promoting its water resistance and mechanical performance at the same time.

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confidence: 99%

Micelle-template synthesis of hollow silica spheres for improving water vapor permeability of waterborne polyurethane membrane

Bao

Wang

Kang

et al. 2017

Sci Rep

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“…Such structure gives rise to the voids between Si–yolk and carbon shell, with enough space to accommodate large volumetric expansion during the cycling. [ 116–119 ] Fabrication of Si nanostructure that is sandwiched by the combine linkage of carbon with mesoporous structure. Then coating of TiO 2 with crystalline structure is applied on the Si nanoparticles (Si@C@TiO 2 ) (Figure 10e).…”

Section: Synthesis Methods Of Silicon Nanomaterialsmentioning

confidence: 99%

When Silicon Materials Meet Natural Sources: Opportunities and Challenges for Low‐Cost Lithium Storage

Rehman

Wang

Manj

et al. 2019

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The manipulation of progressive lithium‐ion batteries (LIBs) with high energy density, low cost, and long‐term cycling stability is of high priority to meet the growing demands for next‐generation energy storage devices. Silicon (Si) has been receiving marvelous attention as a promising anode material for rechargeable LIBs, due to its high theoretical gravimetric capacity and low cost. Si is the second most abundant element in the earth crust in the form of silicates, so it is the most cost‐effective element as an anode material in next‐generation LIBs. In this review, different natural sources such as rice husk, sugar cane bagasse, bamboo, reed plant, sand, halloysite, and different waste sources such as waste of the solar power industry, fly ash, straw ash, and other industrial waste that can give rise to different nanostructured Si are systematically summarized. In addition, different synthesis methods of fabricating nanostructured Si are reviewed as well as including magnesiothermic reduction, etching methods, ball milling, and chemical vapor deposition. The advantages and disadvantages of these kind of synthesis methods are discussed as well. Furthermore, the opportunities and challenges of nano‐Si are also discussed.

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“…15 Second, mesoporous materials must be prepared to produce mesoporous structure. Then, mesoporous materials are integrated with transition metal oxides via various pathways, such as sol-gel, [16][17][18] solvothermal treatment 19,20 and mixed modication. 21 Third, Tao group have reported one-pot hydrothermal preparation for MMC with long chain containing hydrophobic ferrocene terminal group as both structure-directing agent and magnetic source.…”

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Activation of persulfate by MMIOC for highly efficient degradation of rhodamine B

Xie

2017

RSC Adv.

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Mesoporous magnetic iron oxide composites (MMIOCs) were successfully prepared using one-step evaporation induced self-assembly using an organic ferrocene surface active agent as the iron source, and innovatively studied as a potential alternative to mesoporous Co 3 O 4 for ammonium persulfate (PS) activation to generate active radicals. MMIOCs were characterized by X-ray diffraction (XRD), X-ray photoelectron spectroscopy (XPS), N 2 adsorption/desorption, transmission electron microscopy (TEM) and using a vibrating sample magnetometer (VSM). Among the different Fe x O y /PS systems tested, the MMIOC displayed the highest catalytic activity for PS activation, achieving almost complete degradation of 1 mM rhodamine B (RhB) within 120 minutes at 0.2 g L À1 catalyst and 40.0 mM PS. The superior catalytic performance of the MMIOC was ascribed to the combination of iron ions inlayed or embedded in the inner or outer surface, forming catalytically active sites and the magnetic mesoporous structure.Several factors played important roles in controlling the degradation of RhB. The equilibrium between Fe(II) and^Fe(III) for PS activation in solution ensured continuous generation of the hydroxyl and sulfate radicals, and the latter made the predominant contribution for RhB degradation. Considering its outstanding catalytic activity, excellent reusability and long-term stability, MMIOC could be an ideal catalyst for the degradation of RhB. These results provide an applied solution for disposing of toxic organic wastewater in a relatively available environment, and a scientific foundation for solving refractory organic contaminant related to environmental management.

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High-yield hydrothermal synthesis of mesoporous silica hollow capsules

Cited by 14 publications

References 70 publications

Micelle-template synthesis of hollow silica spheres for improving water vapor permeability of waterborne polyurethane membrane

Micelle-template synthesis of hollow silica spheres for improving water vapor permeability of waterborne polyurethane membrane

When Silicon Materials Meet Natural Sources: Opportunities and Challenges for Low‐Cost Lithium Storage

Activation of persulfate by MMIOC for highly efficient degradation of rhodamine B

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