Gamma irradiation route to synthesis of highly re-dispersible natural polymer capped silver nanoparticles

Rao, Yeluri Narayana; Banerjee, Debashis; Datta, Ajoy K.; Das, S. K.; Guin, R.; Saha, Ardhendu

doi:10.1016/j.radphyschem.2010.07.004

Cited by 147 publications

(74 citation statements)

References 57 publications

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…Moreover, the NaCl concentration clearly influenced the characteristics of the as-synthesized AgNP, since a higher concentration means a higher ionic strength and the latter was responsible for causing the electrical double layer to move closer to the particle surface and shrinks in size, which results in the decrease of debye length. Thus, adsorption of ions onto the surface of silver particles and thereby changing the surrounding dielectric environment results in the observed blue-shift in the SPR absorption peaks (Figure 7(a) and 7(b)).This is also supported by earlier observations of the ionic strength effect on the SPR absorption peaks of gum acacia-capped silver nanoparticles [39]. The decrease of particle size ( Figure 7(c)) was probably due to the slower formation rate of nanoparticles, since in this case, the formation rate was linearly correlated with the particle size.…”

Section: 4supporting

confidence: 86%

The Synthesis of Alginate-Capped Silver Nanoparticles under Microwave Irradiation

2015

View full text Add to dashboard Cite

Abstract. Synthesis of silver nanoparticles (Ag-NP) was successfully performed within a few minutes by microwave irradiation of the precursor salt (AgNO 3 ) and alginate mixed solution in one pot. Herein, alginate molecules acted as both a reducing and stabilizing agent for the preparation of the silver nanoparticles. The obtained nanoparticles were characterized by ultraviolet-visible (UV-Vis) spectroscopy, particle size analysis (PSA), Fourier transform infrared spectroscopy (FTIR), and transmission electron microscopy (TEM). The pH and concentration ratio of the alginate/metal precursor salt greatly influenced the particle size and its distribution of Ag-NP. The higher the pH the higher the nucleation rate and the larger the electrostatic stabilization, while both of them were responsible for producing a smaller particle size and a narrower size distribution. A higher concentration ratio also yielded a smaller particle size and a narrower size distribution, but above the optimum ratio, the trend was conversely changed due to the reducing capability of the alginate, which was dominant above the optimum ratio, thus creating a high density of nuclei, allowing aggregation to occur. A lower ratio not only led to a higher tendency to produce larger particles, but also a higher probability of anisotropic particle shape formation due to the lack of reducing capability of the alginates.

show abstract

Section: 4supporting

confidence: 86%

The Synthesis of Alginate-Capped Silver Nanoparticles under Microwave Irradiation

2015

View full text Add to dashboard Cite

show abstract

“…Red shift has been observed by other researchers [33,34] also with increase in AgNO 3 concentration. As mentioned by Rao et al [35], the reason might be increase of Ag ? ions within the nanoscopic domains (loops) with increasing AgNO 3 concentration.…”

Section: Effect Of Microwave Irradiation Timementioning

confidence: 90%

Green synthesis of multi-shaped silver nanoparticles: optical, morphological and antibacterial properties

Singh

Bharti

Meena

2015

J Mater Sci: Mater Electron

View full text Add to dashboard Cite

The manuscript deals with the green synthesis of anisotropic silver nanoparticles (AgNPs). For synthesis, the maltose has been used as reducing and polyvinyl pyrrolidone (PVP) as capping agent and the reaction has been initiated using microwave heating. A strong SPR band at 427 nm and a tail around 590 nm in UV-Vis spectrum of AgNPs, and TEM imaging confirmed the synthesis of anisotropic nanoparticles (NPs). Microwave irradiation time, silver precursor concentration and capping agent concentration affected the particle size as well as particle size distribution. Antibacterial behaviour of anisotropic AgNPs was better than their spherical counterparts.

show abstract

“…Silver nanoparticles are of particular interesting due to their role as substrates in the studies of catalysis (Tsujino and Matsumura 2005;Shimizu et al 2010), surface enhancement, Raman spectroscopy (Debarre et al 2004;Terekhov et al 2011) and in the biomedical field (Xu et al 2006;Liu et al 2010;Krishna Rao et al 2012). Because of their vast applications in various fields, many techniques of synthesizing silver nanoparticles have been investigated and some of them are: chemical reduction (Bhui and Misra 2012), electrochemical reduction (Starowicz et al 2006;Hosseini and Momeni 2010), photochemical reduction (Kutsenko and Granchak 2009), microemulsion (Zhang et al 2011), gamma-ray irradiation (Huang et al 2009;Rao et al 2010), UV irradiation (Spadaro et al 2010), ultrasonic method (Byeon and Kim 2012), microwave method (Nadagouda et al 2011), etc. Different varieties of stabilizers have been used in silver nanoparticles preparation, as mentioned above, to achieve the best control of size, distribution, shape, stability and solubility of silver nanoparticles.…”

Section: Introductionmentioning

confidence: 99%

A novel green one-step synthesis of silver nanoparticles using chitosan: catalytic activity and antimicrobial studies

et al. 2012

View full text Add to dashboard Cite

Stable silver nanoparticles were synthesized using chitosan acting as both reducing and stabilizing agent without using any toxic chemicals. This reaction was carried out in an autoclave at a pressure of 15 psi and 120°C temperature by varying the time. The influence of different parameters such as time, change of concentration of silver nitrate and concentration of chitosan on the formation of silver nanoparticles were studied. The synthesized silver nanoparticles were characterized by UV-visible spectroscopy, Fourier transform infrared, X-ray diffraction and transmission electron microscopy. The results of catalytic reduction of 4-nitrophenol by sodium borohydride in the presence of green synthesized silver nanoparticles were presented. The antimicrobial activity of silver nanoparticles was tested against Escherichia coli and Micrococcus luteus and was found to be possessing inhibiting property.

show abstract

Gamma irradiation route to synthesis of highly re-dispersible natural polymer capped silver nanoparticles

Cited by 147 publications

References 57 publications

The Synthesis of Alginate-Capped Silver Nanoparticles under Microwave Irradiation

The Synthesis of Alginate-Capped Silver Nanoparticles under Microwave Irradiation

Green synthesis of multi-shaped silver nanoparticles: optical, morphological and antibacterial properties

A novel green one-step synthesis of silver nanoparticles using chitosan: catalytic activity and antimicrobial studies

Contact Info

Product

Resources

About