Dialysis process for the removal of surfactants to form colloidal mesoporous silica nanoparticles

Urata, Chihiro; Aoyama, Yuko; Tonegawa, Akihisa; Yamauchi, Yusuke; Kuroda, Kazuyuki

doi:10.1039/b908625k

Cited by 121 publications

(107 citation statements)

References 37 publications

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“…A close examination of TEM showed that these nanoparticles are porous silica with wormlike holes ( Figure S6 in the Supporting Information). [47] As is already known, the dissolution rate of silica nanoparticles drastically depends on the size of particles, alkalinity, and reaction temperature. [13] It is important to note that, before and after crystallization, the pH of the system remained constant, close to 11.5.…”

Section: Resultsmentioning

confidence: 97%

High‐Temperature Synthesis and Formation Mechanism of Stable, Ordered MCM‐41 Silicas by Using Surfactant Cetyltrimethylammonium Tosylate as Template

et al. 2010

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International audienceHighly ordered 2D hexagonal mesostructured silicas with thick pore walls have been directly hydrothermally synthesized at high temperatures in a range from 130 to 175 °C by using the new surfactant cetyltrimethylammonium tosylate (CTATos) as template. The mesoporous structure of the synthesized MCM-41 could be maintained after heating it to reflux in boiling water for at least 24 h. The crystallization temperature, the nature of surfactants, and the relative amount of TAAOH (tetraalkylammonium hydroxide, such as TMAOH and TEAOH) to surfactant were found to be critical parameters that affect the ordering of mesophases. On the basis of the combined characterizations of X-ray diffraction (XRD), N2 adsorption, Fourier transform infrared spectroscopy (FTIR), thermogravimetric analysis (TG), 13C cross-polarization magic-angle spinning (CPMAS) solid-state NMR spectroscopy, transmission electron microscopy (TEM) and scanning electron microscopy (SEM), a new mechanism was proposed to understand the formation mechanism of highly ordered MCM-41 silicas. The enlargement of pore-wall thickness is attributed to the migration and subsequent deposition of the silicate species in the inner pore channel. This process was accelerated by the ion-exchange interaction of tetraalkylammonium cations (TAA+) on CTA+ cations

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Section: Resultsmentioning

confidence: 97%

High‐Temperature Synthesis and Formation Mechanism of Stable, Ordered MCM‐41 Silicas by Using Surfactant Cetyltrimethylammonium Tosylate as Template

et al. 2010

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“…In this method, colloidal mesostructured silica nanoparticles were dialyzed against a 2 M aqueous acetic acid and ethanol (v:v = 1:1) solution to remove the templates ( Figure 6). 80 But, the dispersibility of mesostructured silica nanoparticles can be preserved after the removal of templates. In addition, this method overcomes the above-mentioned disadvantages of the conventional redispersion process for the preparation of colloidal MSNs.…”

Section: Preparative Methods Of Colloidal Msns Without Any Aggregatiomentioning

confidence: 99%

Colloidal Mesoporous Silica Nanoparticles

Yamamoto

Kuroda

2016

Bulletin of the Chemical Society of Japan

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198

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IMMA. His current research interests include mesostructured materials, and several fields of inorganic materials chemistry. Some examples are intercalation chemistry, silicate chemistry, inorganic polymers, sol-gel chemistry, inorganic-organic hybrids, and self-organized materials. AbstractMesoporous silica nanoparticles (MSNs) with colloidal stability have attracted increasing interest because of their important properties, such as high transparency and cell uptake. Colloidal MSNs are comprehensively reviewed from the viewpoints of their preparation, characterization, and applications which include biomedical, catalytic, and optical materials. The following two points have been emphasized. The first point is that this review covers the widest range of introduction and discussion of the preparation and applications of both colloidal and noncolloidal MSNs. The second point is that this account contains a discussion from the viewpoints of both inorganic and colloid chemistries. After the introduction of the historical background of preparation of MSNs, preparative methods of colloidal MSNs and the major factors for the preparation of nanosized and colloidal MSNs are discussed. The methods to control the size, composition, morphology, and pore size of MSNs are also presented. Appropriate methods to obtain MSNs with high colloidal dispersibility are also discussed. Applications of colloidal MSNs are introduced with an emphasis on the colloidal stability. Issues to be addressed for further developments of colloidal MSNs are finally described.

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“…100 nm in diameter are expected to be useful for applications in DDS and transparent media such as low-refractive index materials, thermal insulation films, and low dielectric materials [6][7][8][9][10][11][12][13][14]. However, it has been difficult to synthesize monodisperse porous silica particles of 100 nm in diameter on an industrial scale, because the synthesis should take place in highly diluted solutions [10,[15][16][17][18][19][20][21][22][23][24][25][26][27][28][29][30]. We recently reported the large-scale synthesis of monodisperse microporous silica particles of 100 nm in diameter [31], based on the modified Stöber method [32].…”

Section: Introductionmentioning

confidence: 99%

Morphology control of microporous silica particles obtained by gradual injection of reactants

Shimogaki

Tokoro

Tabuchi

et al. 2015

J Sol-Gel Sci Technol

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Industrial-scale synthesis of fine-tuned monodisperse microporous silica is a central concern on fillers and optical applications. We recently reported that the efficient synthesis of monodisperse microporous silica particles can be achieved by the gradual injection of reactants. In the present study, we investigated the influence of the injection kinetics, the template, and catalyst contents on the morphology of the resulting silica particles. Their specific surface area (SSA) could be tuned from 100 to 500 m 2 /g by the amount of templating molecule, ndodecylamine, without changing the particle size and dispersibility. The most important parameters for controlling the particle size were found to be the amounts of catalyst. The resultant microporous and monodisperse silica particles exhibit diameter ranging from 20 to 200 nm and SSA from 50 to 1000 m 2 /g. These results show that the gradual injection of the reactants in a controlled manner is effective to the industrial-scale synthesis of the silica nanoparticles with expected morphologies. Graphical Abstract

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Dialysis process for the removal of surfactants to form colloidal mesoporous silica nanoparticles

Cited by 121 publications

References 37 publications

High‐Temperature Synthesis and Formation Mechanism of Stable, Ordered MCM‐41 Silicas by Using Surfactant Cetyltrimethylammonium Tosylate as Template

High‐Temperature Synthesis and Formation Mechanism of Stable, Ordered MCM‐41 Silicas by Using Surfactant Cetyltrimethylammonium Tosylate as Template

Colloidal Mesoporous Silica Nanoparticles

Morphology control of microporous silica particles obtained by gradual injection of reactants

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