Structure and microstructure of nanoscale mesoporous silica spheres

Lebedev, Oleg I.; Tendeloo, Gustaaf Van; Collart, O.; Cool, Pegie; Vansant, Etienne F.

doi:10.1016/j.solidstatesciences.2004.01.013

Cited by 55 publications

(59 citation statements)

References 31 publications

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“…It can be used as effective materials in various cementitious system for improving the strength, flexibility, durability, workability, etc. Various synthetic strategies have been reported to prepare silica nanoparticles, such as the modified Stöber method (Grün et al 1999;Pauwels et al 2001;Liu et al 2003;Zhang et al 2004;Lebedev et al 2004;Tan et al 2004;Shimura et al 2005;Tan et al 2005), combustion techniques (Hong et al 2009), chemical vapor deposition (Awaji et al 1997), aerosol spray (Rao et al 2002;Bore et al 2003;Miller et al 2005),and emulsion (Oh et al 2005) method. Various types of morphology such as hexagonal, cubic, lamellar, and wormhole like mesostructures have been synthesized using these methods.…”

Section: Introductionmentioning

confidence: 99%

Functional role of cationic surfactant to control the nano size of silica powder

et al. 2011

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Preparation of dispersed, amorphous, spherical silica nanoparticles using cationic surfactant as organic template, tetraethoxysilane (TEOS) as silica precursor and ammonia as catalyst has been carried out using sol gel process. The aim of the present study was to evaluate the simultaneous effects of cationic surfactant on the textural and structural properties of silica nanoparticles. We used a series of the cationic surfactants, dodecytrimethylammonium bromide (DTAB), tetradecyltrimethylammonium bromide (TTAB) and cetyltrimethylammonium bromide (CTAB) to evaluate the effects of the chain length of cationic surfactant on the grain size of silica nanoparticles. The size of silica nanoparticles can be finely tuned in the range *50-100 nm by changing the chain length of cationic surfactant. Decreasing the particle size of silica nano particles resulted in increase in chain length of cationic surfactant. Further, these silica nanoparticles are incorporated with cement paste to evaluate the beneficial effect on mechanical properties of cement. Synthesized silica nanoparticles were analyzed using scanning electron microscopy (SEM), 29 Si MAS NMR, powder X-ray diffraction techniques (XRD) and IR studies.

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Section: Introductionmentioning

confidence: 99%

Functional role of cationic surfactant to control the nano size of silica powder

et al. 2011

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“…A seed-growth mechanism was also suggested by Lebedev et al [16] for nanoscale mesoporous particles. In a detailed microscopic analysis they observed the formation of cubic centers with hexagonal pores orthogonally growing off the facets of the central polyhedra to result in spherical particles.…”

Section: Full Papermentioning

confidence: 58%

Colloidal Suspensions of Nanometer‐Sized Mesoporous Silica

Möller¹,

Kobler

Bein

2007

Adv Funct Materials

412

333

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Nanometer‐sized surfactant‐templated materials are prepared in the form of stable suspensions of colloidal mesoporous silica (CMS) consisting of discrete, nonaggregated particles with dimensions smaller than 200 nm. A high‐yield synthesis procedure is reported based on a cationic surfactant and low water content that additionally enables the adjustment of the size range of the individual particles between 50 and 100 nm. Particularly, the use of the base triethanolamine (TEA) and the specific reaction conditions result in long‐lived suspensions. Dynamic light scattering reveals narrow particle size distributions in these suspensions. Smooth spherical particles with pores growing from the center to the periphery are observed by using transmission electron microscopy, suggesting a seed‐growth mechanism. The template molecules could be extracted from the nanoscale mesoporous particles via sonication in acidic media. The resulting nanoparticles give rise to type IV adsorption isotherms revealing typical mesopores and additional textural porosity. High surface areas of over 1000 m2 g–1 and large pore volumes of up to 1 mL g–1 are obtained for these extracted samples.

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“…Recently, MCM-41 type mesoporous silica nanoparticles have been proved effective as intracellular delivery vehicles [8]. Diverse synthetic strategies have been reported to prepare mesoporous silica spheres, including the Stöber method [9] and the modified Stöber method [10][11][12][13][14][15][16], fluorocarbon-surfactant mediated synthesis [17,18], aerosol spray [19][20][21], emulsion [22] and reverse emulsion [23]. By these methods, hexagonal, cubic, lamellar, and wormholelike mesostructures have been synthesized.…”

Section: Introductionmentioning

confidence: 99%