Sonochemical Processes and Formation of Gold Nanoparticles within Pores of Mesoporous Silica

Chen, Wei; Cai, Weiping; Zhang, Liang; Wang, Guozhong; Zhang, Lide

doi:10.1006/jcis.2001.7525

Cited by 179 publications

(113 citation statements)

References 25 publications

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“…Chen et al [231][232][233][234][235] and Sun et al [236] have reported a sonochemical method for the incorporation of AuNPs into mesoporous silica at room temperature. The AuNPs ranging from 2 to 9 nm were dispersed uniformly within the pores of the silica support by the immersion of the host material into a chloroauric acid solution (0.8 mmol/L) containing 0.2 mol/L of isopropanol during 2 to 3 weeks.…”

Section: Other Methods Of Synthesismentioning

confidence: 99%

Synthesis of Gold Catalysts Supported on Mesoporous Silica Materials: Recent Developments

2011

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Mesoporous silica materials (MSM) with ordered and controllable porous structure, high surface area, pore volume and thermal stability are very suitable catalyst supports, because they provide high dispersion of metal nanoparticles and facilitate the access of the substrates to the active sites. Since the conventional wet-impregnation and deposition-precipitation methods are not appropriate for the incorporation of gold nanoparticles (AuNPs) into MSM, considerable efforts have been made to develop suitable methods to synthesize Au/MSM catalysts, because the incorporation of AuNPs into the channel system can prevent their agglomeration and leaching. In this review, we summarize the main methods to synthesize active gold catalysts supported on MSM. Examples and details of the preparative methods, as well as selected applications are provided. We expect this article to be interesting to researchers due to the wide variety of chemical reactions that can be catalyzed by gold supported catalysts.

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Section: Other Methods Of Synthesismentioning

confidence: 99%

Synthesis of Gold Catalysts Supported on Mesoporous Silica Materials: Recent Developments

2011

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“…Nanocomposites of polymer/silver nanoparticles have attracted great attention because of their potential applications in the fields of catalysis, bioengineering, photonics, and electronics (Kiesow et al 2003). Polymers are considered good host materials for metallic nanoparticles as well as other stabilizing agents, including citrates, organic solvents (e.g., tetrahydrofuran and tetrahydrofuran/methanol), long chain alcohols, surfactants, and organometallics (Sarkar et al 2005;Chen et al 2001). Various chemical and physical methods were applied to prepare metal-polymer composites (e.g., fabrication approach) (Kiesow et al 2003;Rifai et al 2006).…”

Section: Applications Of Silver Nanoparticles and Their Incorporationmentioning

confidence: 99%

Silver Nanoparticles

Korbekandi¹,

Iravani²

2012

The Delivery of Nanoparticles

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“…The chemical approaches, such as chemical reduction, electrochemical techniques, lithography, and photochemical reduction, are most widely used. 8,9 Though they have the control over the size and shape of the nanoparticles, they pose some threats when they are being used in the medical applications. Moreover, they are expensive, need high pressure, energy, and temperature, and need use of some toxic chemicals for the stabilization of nanoparticles, leading to adverse effects when they are being applied in the medical and pharmaceutical applications; 10 hence, there is an increasing need for the development of an eco-friendly process for the synthesis of nanoparticles.…”

Section: Introductionmentioning

confidence: 99%

Biosynthesis characterization of silver nanoparticles using Cassia roxburghii DC. aqueous extract, and coated on cotton cloth for effective antibacterial activity

Balashanmugam¹,

Kalaichelvan²

2015

IJN

146

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The present study reports the green synthesis of silver nanoparticles (AgNPs) from silver precursor using a plant biomaterial, Cassia roxburghii DC., aqueous extract. The AgNPs were synthesized from the shade-dried leaf extract and assessed for their stability; they elucidated characteristics under UV–visible spectroscopy, X-ray diffraction, Fourier transform infrared spectroscopy, high-resolution transmission electron microscopy, and energy dispersive X-ray spectroscopy. The synthesized AgNPs exhibited a maximum absorption at 430 nm, and the X-ray diffraction patterns showed that they were crystal in nature. Fourier transform infrared spectroscopy analysis confirmed the conversion of Ag + ions to AgNPs due to the reduction by capping material of plant extract. The HR-TEM analysis revealed that they are spherical ranging from 10 nm to 30 nm. The spot EDAX analysis showed the presence of silver atoms. In addition, AgNPs were evaluated for their antibacterial activity against six different pathogenic bacteria: three Gram-positive bacteria, Bacillus subtilis, Staphylococcus aureus , and Micrococcus luteus , and three Gram-negative bacteria, Pseudomonas aeruginosa, Escherichia coli , and Enterobacter aerogenes. They were highly sensitive to AgNPs, whereas less sensitive to AgNO 3 . Furthermore, the green synthesized AgNPs were immobilized on cotton fabrics and screened for antibacterial activity. The immobilized AgNPs on cotton cloth showed high antibacterial activity. Therefore, they could be a feasible alternative source in treating wounds or may help in replacing pharmaceutical band-aids.

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Sonochemical Processes and Formation of Gold Nanoparticles within Pores of Mesoporous Silica

Cited by 179 publications

References 25 publications

Synthesis of Gold Catalysts Supported on Mesoporous Silica Materials: Recent Developments

Synthesis of Gold Catalysts Supported on Mesoporous Silica Materials: Recent Developments

Silver Nanoparticles

Biosynthesis characterization of silver nanoparticles using Cassia roxburghii DC. aqueous extract, and coated on cotton cloth for effective antibacterial activity

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