Synthesis of ultra-small hollow silica nanoparticles using the prepared amorphous calcium carbonate in one-pot process

Nakashima, Y.; Takai, Chika; Razavi‐Khosroshahi, Hadi; Suthabanditpong, W.; Fuji, Masayoshi

doi:10.1016/j.apt.2018.01.006

Cited by 27 publications

(29 citation statements)

References 26 publications

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“…The ACC particles were firstly prepared by the carbonation method, which the procedure was conducted in the methanol solvent to form the Ca(OCH 3 ) 2 layers on the ACC particles. An effect of methanol concentration on the morphology of ACC particles was also investigated [13]. ACC particles were prepared by a carbonation method via bubbling CO 2 gas into calcium ions dispersing in methanol solution.…”

Section: Introductionmentioning

confidence: 99%

Synthesis of Nanosilica via Olivine Mineral Carbonation under High Pressure in an Autoclave

Stopić

Dertmann

Koiwa

et al. 2019

Metals

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Silicon dioxide nanoparticles, also known as silica nanoparticles or nanosilica, are the basis for a great deal of biomedical and catalytic research due to their stability, low toxicity and ability to be functionalized with a range of molecules and polymers. A novel synthesis route is based on CO2 absorption/sequestration in an autoclave by forsterite (Mg2SiO4), which is part of the mineral group of olivines. Therefore, it is a feasible and safe method to bind carbon dioxide in carbonate compounds such as magnesite forming at the same time as the spherical particles of silica. Indifference to traditional methods of synthesis of nanosilica such as sol gel, ultrasonic spray pyrolysis method and hydrothermal synthesis using some acids and alkaline solutions, this synthesis method takes place in water solution at 175 °C and above 100 bar. Our first experiments have studied the influence of some additives such as sodium bicarbonate, oxalic acid and ascorbic acid, solid/liquid ratio and particle size on the carbonation efficiency, without any consideration of formed silica. This paper focuses on a carbonation mechanism for synthesis of nanosilica under high pressure and high temperature in an autoclave, its morphological characteristics and important parameters for silica precipitation such as pH-value and rotating speed.

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Section: Introductionmentioning

confidence: 99%

Synthesis of Nanosilica via Olivine Mineral Carbonation under High Pressure in an Autoclave

Stopić

Dertmann

Koiwa

et al. 2019

Metals

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“…Synthesis of HSPs using inorganic templates such as calcium carbonate [39][40][41], hydroxy apatite [42], and carbon particles [43] have also been explored. Silica deposition is performed using the common Stöber method, while the inorganic core is removed by either acidic dissolution [39][40][41][42] or by heating at high temperature [43]. This approach is effective, resulting in the formation of smaller (30-100 nm) HSPs; however, creating inorganic particles with good size control is a challenging and costly task.…”

Section: Synthesismentioning

confidence: 99%

“…Figure 1 depicts the common approaches to HSP synthesis, while Figure 2 shows TEM images of HSPs synthesized using representative approaches. [32], (b) surfactant-free emulsion [30], (c) calcium carbonate particle templates [41], (d) etching of solid silica particles [44], (e) carbon particle templates [43], and (f) polystyrene particle templates [58].…”

Section: Synthesismentioning

confidence: 99%

“…Reproduced from [32] with permission from Elsevier (2010). Reproduced from [41] with permission from Springer Nature (2018). Reproduced from [44] with permission from Elsevier (2012).…”

Section: Synthesismentioning

confidence: 99%

“…Scanning electron microscopy (SEM) imaging is the main technique employed to determine the HSP size, while transmission electron microscopy (TEM) helps in determining the shell thickness and shell type (solid or porous), in addition to the HSP size [13,23]. Brunauer-Emmett-Teller (BET) analysis is applied to measure the specific surface areas (surface area per unit of mass or volume) of mesopores present in the shells of the HSPs [35,41,59]. BET analysis utilizes the amount of gas (generally N 2 ) adsorbed and desorbed at boiling point (77K) and different partial pressures in order to deduce the specific surface area of the porous material.…”

Section: Characterizationmentioning

confidence: 99%

See 2 more Smart Citations

Hollow Silica Particles: Recent Progress and Future Perspectives

Sharma

Polizos

2020

Nanomaterials

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Hollow silica particles (or mesoporous hollow silica particles) are sought after for applications across several fields, including drug delivery, battery anodes, catalysis, thermal insulation, and functional coatings. Significant progress has been made in hollow silica particle synthesis and several new methods are being explored to use these particles in real-world applications. This review article presents a brief and critical discussion of synthesis strategies, characterization techniques, and current and possible future applications of these particles.

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Bio‐Inspired Synthesis of Hollow Mesoporous Bioactive Glass Nanoparticles Using Calcium Carbonate as Solid Template

2022

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We report a surfactant free route to synthesize hollow mesoporous bioactive glass nanoparticles at ambient atmospheric condition. The synthesized particles contain hollow core as a result of mild acid mediated removal of calcium carbonate nanoparticles used as hard template. Removal of template was confirmed through FTIR and XRD while round morphology and sizes below 100 nm could be observed by TEM. In addition, N 2 adsorption and desorption analysis confirmed hollow and mesoporous nature of the bioactive glass shell. Interestingly, post removal of template, particles reported higher surface area, pore volume and pore diameter along with decrease in surface charge. Deposition of hydroxyapatite on hollow bioactive glass in Simulated Buffer Fluid (SBF) could be observed from Day 7 of immersion while well-developed hydroxyapatite depositions could be observed by Day 30. This proved bioactivity of the material while cytotoxicity analysis on Human Osteosarcoma cell line (U2OS) through MTT assay proved the biocompatible nature of the hollow bioactive glass particle.

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Synthesis of ultra-small hollow silica nanoparticles using the prepared amorphous calcium carbonate in one-pot process

Cited by 27 publications

References 26 publications

Synthesis of Nanosilica via Olivine Mineral Carbonation under High Pressure in an Autoclave

Synthesis of Nanosilica via Olivine Mineral Carbonation under High Pressure in an Autoclave

Hollow Silica Particles: Recent Progress and Future Perspectives

Bio‐Inspired Synthesis of Hollow Mesoporous Bioactive Glass Nanoparticles Using Calcium Carbonate as Solid Template

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