Implications of citrate concentration during the seeded growth synthesis of gold nanoparticles

Volkert, Anna A.; Subramaniam, Varuni; Haes, Amanda J.

doi:10.1039/c0cc02075c

Cited by 55 publications

(49 citation statements)

References 17 publications

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…Previous works reported that colloidal solutions of gold nanoparticles synthesized using sodium citrate are stable for at least one year. 26,29 The concentration of gold nanoparticles in the AuNP colloidal solution was determined from the ICP-MS data and it is shown in Table 1. This concentration was estimated from the total amount of gold found in the bottom of the tube after the centrifugation procedure.…”

Section: Resultsmentioning

confidence: 99%

Using Gold Nanoparticles as Passive Sampler for Indoor Monitoring of Gaseous Elemental Mercury

Santos¹,

Ferlin²,

Fostier³

et al. 2016

J. Braz. Chem. Soc.

View full text Add to dashboard Cite

This study reports a functional passive sampler for monitoring gaseous elemental mercury (GEM). The material consists of gold nanoparticles (AuNP) deposited forming a film on thiolmodified glass slides. AuNP colloid was synthesized using sodium citrate, resulting in a size of 24.2 ± 0.8 nm, as determined by transmission electron microscopy analysis. For the indoor test, AuNP films were placed into Petri plates. One part of the lot was kept exposed to the laboratory's atmosphere and the other part was stored in closed plate (control). The films were removed from both plates along a month and analyzed using a direct mercury analyzer. A linear relationship between Hg retention and exposure time was obtained until the 23 rd day, which allowed to calculate a GEM retention rate of 2.2 ng g -1 day -1; the maximum retention capacity was around 50 ng g -1. This study provides an efficient method for indoor monitoring of GEM using AuNP films as passive sampler.

show abstract

Section: Resultsmentioning

confidence: 99%

Using Gold Nanoparticles as Passive Sampler for Indoor Monitoring of Gaseous Elemental Mercury

Santos¹,

Ferlin²,

Fostier³

et al. 2016

J. Braz. Chem. Soc.

View full text Add to dashboard Cite

show abstract

“…It can be concluded that the higher ionic strength as a result of high molarities of HAuCl 4 leave a significant impact on the size of gold nanoparticles obtained. [28] Effect of concentration of PRX-MEA on Particle size and loading efficiency…”

Section: Effect Of Gold Salt Concentration On Particle Size and Loadimentioning

confidence: 99%

Optimization of Piroxicam Monoethanolamine Loaded Gold Nanoparticles Using 23 Full Factorial Design Approach.

Shaji¹

2017

WJPR

View full text Add to dashboard Cite

The objective of the present study was to investigate the combined effect of three independent variables in the fabrication of Piroxicam monoethanolamine (PRX-MEA) loaded gold nanoparticles (PMAuNPs) using a 2 3 full factorial design. PM-AuNPs were prepared by green chemistry approach using methanolic green tea (Camellia.sinesis) extract with factors viz. gold salt concentration X 1 (1.57 to 3.93 mg), PRX-MEA concentration X 2 (2.86 to 8.12 mg) and reaction time X 3 (60 to 180 min.) and were evaluated for their particle Size Y 1 (nm) and % loading efficiency Y 2 (% LE). The mean particle size of PM-AuNPs batches ranged between 43 to 158.3 nm. Preliminary trials of PM-AuNPs revealed that on increasing the gold salt concentration the particle size was also increased. The % LE was found to be between 81.94 % to 97.78%.Process variables such as gold salt and PRX-MEA concentration had positive impact on percent drug loading efficiency. The effects of all the tested independent variables were significant (P-values<0.05).Using design check point analysis the optimum formulation comprising of 1.96 mg of gold salt, 6.58mg of PRX-MEA and stirring time of 180 min was selected. This formulation demonstrated particle size of 51.02 ± 45 nm and LE of 88.05 ± 0.36 %. PM-AuNPs with small particle size and excellent loading efficiency were successfully produced using this method. Characterization of optimum formulation by evaluating the experimental data showed no significant difference between predicted and observed values.

show abstract

“…Like citrate, exploitation of tannic acid (a plant derived polyphenol) as a reductant and stabilizer in the synthesis of gold nanoparticles dates back to early 20 th century [22,23] but citrate in the past few decades enjoys an extra edge over tannic acid (TA) as an agent for GNPs synthesis. Overwhelming amount of literature is available for the effect of citrate concentration [24], pH [25], temperature [26] and gold chloride concentrations [22] on the characteristic properties of GNPs synthesized using citrate as reductant. However, similar studies on the GNPs synthesized exploiting TA have not been much explored and our knowledge on this subject remains in its infancy.…”

Section: Introductionmentioning

confidence: 99%

Size Variation of Gold Nanoparticles Synthesized Using Tannic Acid in Response to Higher Chloroauric Acid Concentrations

Ahmad¹,

Khan²

2013

WJNSE

View full text Add to dashboard Cite

The size evolution of gold nanoparticles synthesized using tannic acid with initial gold chloride concentrations ranging from 0.2 -2 mM at various tannic acid to chloroauric acid molar ratios (ranging from 2:1 to 12:1) has been analysed. Dynamic light scattering spectroscopic and tramission electron microscopic analyses were performed to assess the size of formed gold nanoparticles. Two different patterns of nanoparticle size evolution were obtained; the size evolution trend below 1 mM chloroauric acid concentration was found to be different from the one obtained at gold chloride concentrations higher than or equal to 1 mM. In case of sizes obtained for less than 1 mM gold chloride concentration, a general decrease in particle size was observed with increase in gold salt concentration. On the contrary, for the particles synthesised using chloroauric acid concentrations higher than or equal to 1 mM, with increase in gold salt concentration, a general increase in nanoparticle diameter was seen. For the molarities 0.2 and 0.5 mM, with increase in tannic acid/ chloroauric acid ratios, first the size decreases and then increases and finally reaches saturation. Particles formed at molarities greater than equal to 1 mM do not exhibit plateaux in their size rather initially decrease and then increase in response to increasing tannic acid/chloroauric acid ratios except for 2 mM concentration at which a small saturation is observed. The findings enumerate that higher gold chloride concentrations leave a significant impact on the sizes of gold nanaparticles obtained using tannic acid as a reducing agent of chloroauric acid solution.

show abstract

Implications of citrate concentration during the seeded growth synthesis of gold nanoparticles

Abstract: Increasing the citrate concentration during the seeded growth synthesis of gold nanoparticles yields materials with decreased aspect ratios and increased defect densities. The stability of these nanoparticles is attributed to variations in their overall Gibb's free energy.

Cited by 55 publications

References 17 publications

Using Gold Nanoparticles as Passive Sampler for Indoor Monitoring of Gaseous Elemental Mercury

Using Gold Nanoparticles as Passive Sampler for Indoor Monitoring of Gaseous Elemental Mercury

Optimization of Piroxicam Monoethanolamine Loaded Gold Nanoparticles Using 23 Full Factorial Design Approach.

Size Variation of Gold Nanoparticles Synthesized Using Tannic Acid in Response to Higher Chloroauric Acid Concentrations

Contact Info

Product

Resources

About