Synthesis of mesoporous silica nanosphere using different templates

Venkatathri, N.

doi:10.1016/j.ssc.2007.06.017

Cited by 27 publications

(14 citation statements)

References 25 publications

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“…Hu et al have successfully synthesized silica hollow sphere of a high surface area with a diameter about 50 nm using CaCO 3 as the template (Yongqi et al 2008). Mesoporous silica nanospheres with uniform size and morphology have been synthesized using polyvinyl pyrrolidine and cetyltrimethylammonium bromide, cetyltrimethylammonium chloride and n-octylamine as template (Venkatathri 2007).…”

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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“…Hexagonal shaped mesoporous silica particles have also been reported [8]. Venkatathri synthesized mesoporous silica nanospheres with uniform size and morphology using polyvinyl pyrrolidine and different types of cationic surfactants [9]. Mesoporous silica was synthesized using cetyltrimethyl ammonium bromide (CTAB) and sulphonated aromatic poly (ether ether ketone) (SPEEK) or poly(allylamine hydrochloride) (PAACl), as co-templates under a basic condition by Pang and coworker.…”

Section: Introductionmentioning

confidence: 98%

Preparation of Silica Nanoparticles and its Beneficial Role in Cementitious Materials

Singh

Agarwal

Bhattacharyya

et al. 2011

Nanomaterials and Nanotechnology

115

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Spherical silica nanoparticles (n-SiO2) with controllable size have been synthesized using tetraethoxysilane as starting material and ethanol as solvent by sol-gel method. Morphology and size of the particles was controlled through surfactants. Sorbitan monolaurate, sorbitain monopalmitate and sorbitain monostearate produced silica nanoparticles of varying sizes (80-150 nm), indicating the effect of chain length of the surfactant. Increase in chain length of non-ionic surfactant resulted in decreasing particle size of silica nanoparticles. Further, the size of silica particles was also controlled using NH3 as base catalyst. These silica nanoparticles were incorporated into cement paste and their role in accelerating the cementitious reactions was investigated. Addition of silica nanoparticles into cement paste improved the microstructure of the paste and calcium leaching is significantly reduced as n-SiO2 reacts with calcium hydroxide and form additional calciumsilicate-hydrate (C-S-H) gel. It was found that calcium hydroxide content in silica nanoparticles incorporated cement paste reduced ~89% at 1 day and up to ~60% at 28 days of hydration process. Synthesized silica particles and cement paste samples were characterized using scanning electron microscopy (SEM), powder X-ray diffraction (XRD), infrared spectroscopy (IR) and thermogravimetric analysis (TGA).

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“…Silica is synthesized in various shapes, i.e. cubic, spherical and meso-porous [8][9][10][11]. The numerous investigations on the synthesis routes of silica nanostructures have been carried out, including micro emulsions, Stöber and sonochemical [12][13][14].…”

Section: Introductionmentioning

confidence: 99%

Sonochemical Synthesis of Spherical Silica Nanoparticles and Polymeric Nanocomposites

2015

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In this work spherical SiO 2 nanoparticles were synthesized by sonochemical method using a new Schiff-base as a capping agent. The silica nanoparticles were obtained by hydrolysis of tetraethyl orthosilicate in aqueous alcohol solution. The effect of different parameters such as molar concentration of Schiffbase ligands and ultrasonic irradiation on the morphology and size of the products was examined. The results demonstrated that applying the appropriate amount of Schiff-base could be effective in control of particle size. The influence of SiO 2 nanostructures on the flame retardancy of the poly styrene, poly vinyl alcohol, cellulose acetate and ethyl cellulose was studied. In-situ and ex situ nanocomposites were investigated and results confirm that flame retardancy of in situ nanocomposites were better than ex situ samples. HOÁÁÁSi-O-SiÁÁÁOH barrier prevents reaching of flame, heat and oxygen to the polymeric nanocomposites.

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Synthesis of mesoporous silica nanosphere using different templates

Cited by 27 publications

References 25 publications

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

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

Preparation of Silica Nanoparticles and its Beneficial Role in Cementitious Materials

Sonochemical Synthesis of Spherical Silica Nanoparticles and Polymeric Nanocomposites

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