Synthesis of sulfur nanoparticles in aqueous surfactant solutions

Chaudhuri, Rajib Ghosh; Paria, Santanu

doi:10.1016/j.jcis.2009.12.004

Cited by 147 publications

(111 citation statements)

References 28 publications

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“…The pattern of rapid S 0 globule nucleation, followed by growth but no new visible globule production, can be explained by aggregation and Ostwald particle ripening. S 8 rings can quickly aggregate into very small condensed forms of sulfur (Steudel et al, 1988;Steudel, 1996Steudel, , 2003, with a critical nucleus size as low as 30 nm (Chaudhuri & Paria, 2010). Attraction between these clusters causes further aggregation (Garcia & Druschel, 2014).…”

Section: Discussionmentioning

confidence: 99%

Mechanisms of extracellular S0 globule production and degradation in Chlorobaculum tepidum via dynamic cell–globule interactions

et al. 2016

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The Chlorobiales are anoxygenic phototrophs that produce solid, extracellular elemental sulfur globules as an intermediate step in the oxidation of sulfide to sulfate. These organisms must export sulfur while preventing cell encrustation during S 0 globule formation; during globule degradation they must find and mobilize the sulfur for intracellular oxidation to sulfate. To understand how the Chlorobiales address these challenges, we characterized the spatial relationships and physical dynamics of Chlorobaculum tepidum cells and S 0 globules by light and electron microscopy. Cba. tepidum commonly formed globules at a distance from cells. Soluble polysulfides detected during globule production may allow for remote nucleation of globules. Polysulfides were also detected during globule degradation, probably produced as an intermediate of sulfur oxidation by attached cells. Polysulfides could feed unattached cells, which made up over 80% of the population and had comparable growth rates to attached cells. Given that S 0 is formed remotely from cells, there is a question as to how cells are able to move toward S 0 in order to attach. Time-lapse microscopy shows that Cba. tepidum is in fact capable of twitching motility, a finding supported by the presence of genes encoding type IV pili. Our results show how Cba. tepidum is able to avoid mineral encrustation and benefit from globule degradation even when not attached. In the environment, Cba. tepidum may also benefit from soluble sulfur species produced by other sulfur-oxidizing or sulfur-reducing bacteria as these organisms interact with its biogenic S 0 globules.

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Section: Discussionmentioning

confidence: 99%

Mechanisms of extracellular S0 globule production and degradation in Chlorobaculum tepidum via dynamic cell–globule interactions

et al. 2016

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“…Colloidal or nano sized sulfur particles were synthesized by different routes such as acid hydrolysis of sodium thiosulphate [8][9][10][11], polysulfide decomposition [12,13], H 2 S reduction by Fe-chelate [14], ultrasonic treatment of sulfur-cystine solution [15]. In our previous study, the advantages and disadvantages of different synthesis methods were discussed to justify the need of an aqueous based easy synthesis route of sulfur nanoparticles synthesis [11]. The results show in the presence of CTAB smaller sized particles are formed in a particular reactant concentration range and anionic and nonionic surfactants are also having significant role in controlling the particle size.…”

Section: Introductionmentioning

confidence: 99%

Growth kinetics of sulfur nanoparticles in aqueous surfactant solutions

Chaudhuri

Paria

2011

Journal of Colloid and Interface Science

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“…2b and c, the core-shell microstructure of S@rGO composites with a crumpled rGO outer layer have been successfully formed via a CTAB-assisted electrostatic attraction method. CTAB, a well-known canonic surfactant media, can not only limit the excessive growth of ␣-S particles but also decorate ␣-S with positive charge [19], which facilitates the wrapping process by negatively charged GO. After wrapped by rGO, the particle size of ␣-S did not change obviously, indicating that the size limiting effect mainly occurred in the initial synthesis stage.…”

Section: Xrd Patternsmentioning

confidence: 99%

“…The fabrication procedure mainly consists of three steps: the fresh formed ␣-S particles are firstly modified by the cationic surfactant CTAB, then ␣-S particles are wrapped by negatively charged grapene oxide (GO) sheets via electrostatic attraction and finally GO is converted to reduced grapene oxide (rGO) by hydrazine. In this process, CTAB not only tailors the growth of ␣-S with small particle size [19], but also renders ␣-S with positive charges. The rGO nanocoating enhanced the absorption of visible light, facilitated the separation of photogenerated charges, promoted the adsorption of dye moleculars, and provided the perfect chemical protection to inner sulfur particles.…”

Section: Introductionmentioning

confidence: 99%