Effect of Hydrophobicity inside PEO−PPO−PEO Block Copolymer Micelles on the Stabilization of Gold Nanoparticles: Experiments

Chen, Shu; Chen, Guo; Hu, Guohua; Wang, Jing; Ma, Jinyuan; Liang, Xia; Zheng, Lily; Liu, Huizhou

doi:10.1021/la061093m

Cited by 77 publications

(67 citation statements)

References 46 publications

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“…A traditional surfactant or some polymeric compounds form micelles which are used to stabilize the metal nanoparticles. 31,32 The micelles are porous clusters with deep water filled cavities. In the case of traditional surfactants, micelles control the shape of the nanoparticles by trapping the metal ion and reagent in the small cavities.…”

Section: Resultsmentioning

confidence: 99%

Self-assembled surfactant cyclic peptide nanostructures as stabilizing agents

et al. 2013

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A number of cyclic peptides including [FR]4, [FK]4, [WR]4, [CR]4, [AK]4, and [WK]n (n = 3-5) containing L-amino acids were produced using solid-phase peptide synthesis. We hypothesized that an optimal balance of hydrophobicity and charge could generate self-assembled nanostructures in aqueous solution by intramolecular and/or intermolecular interactions. Among all the designed peptides, [WR]n (n = 3-5) generated self-assembled vesicle-like nanostructures at room temperature as shown by transmission electron microscopy (TEM), scanning electron microscopy (SEM), and/or dynamic light scattering (DLS). This class of peptides represents the first report of surfactant-like cyclic peptides that self-assemble into nanostructures. A plausible mechanistic insight into the self-assembly of [WR]5 was obtained by molecular modeling studies. Modified [WR]5 analogues, such as [WMeR]5, [WR(Me)2]5, [WMeR(Me)2]5, and [WdR]5, exhibited different morphologies to [WR]5 as shown by TEM observations. [WR]5 exhibited a significant stabilizing effect for generated silver nanoparticles and glyceraldehyde-3-phosphate dehydrogenase activity. These studies established a new class of surfactant-like cyclic peptides that self-assembled into nanostructures and could have potential applications for the stabilization of silver nanoparticles and protein biomolecules.

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Section: Resultsmentioning

confidence: 99%

Self-assembled surfactant cyclic peptide nanostructures as stabilizing agents

et al. 2013

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“…The control over the particle size in nanoparticle synthesis depends on the stabilizing ability of the capping ligands [9]. Pluronic tri block co-polymers have recently shown promise as capping agents for particle size control in noble metals [33][34][35][36][37] and magnetic oxide nanoparticles [38][39] but have not been used for the synthesis of elemental magnetic nanoparticles.…”

Section: Introductionmentioning

confidence: 99%

Block copolymer mediated stabilization of sub-5 nm superparamagnetic nickel nanoparticles in an aqueous medium

et al. 2009

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The paper presents a facile method for decreasing the size of water dispersible Ni nanoparticles from 30 nm to 3 nm by the incorporation of a passivating surfactant combination of pluronic triblock copolymer and oleic acid into a wet chemical reduction synthesis. A detailed study revealed that the size of the Ni nanoparticles is critically governed not only by the concentration of the tri block copolymers but also dependent on the hydrophobic nature of the micelle-core formed. The synthesized Ni nanoparticles were thoroughly characterized by TEM, XRD, XPS and temperature and field dependent magnetic measurements along with a comprehensive FTIR analysis to predict a possible mechanism of formation. Mirkin and co-workers demonstrated the efficient and selective separation of His-tagged proteins using Ni-based nanorods with a diameter of about 300 nm [15]. Hyeon and co-workers have successfully proved that superparamagnetic Ni with NiO shells have a high affinity for poly histidine and can be utilized for separating and purifying His-tagged proteins from a multicomponent solution [16]. Introduction.Ni nanoparticles can be synthesised in both organic and aqueous media. The high temperature decomposition of nickel carbonyl compounds [17] or Ni(acac) 2 compounds [18] in the presence of oleylamine, tri octyl phosphine oxide (TOPO) and tri octyl phosphine (TOP) [19] are common organic routes. While these methods are capable of producing monodispersed Ni with sub 5 nm size range, partial oxidation on the surface of the particles occurs readily even with the use of more than one capping agent [19]. Furthermore, the complexity involved in the above synthetic procedures is quite evident, requiring many steps, higher temperature, inert atmosphere and the use of non-regular, toxic chemicals. Microemulsion based methods using mixtures of polar and non polar solvents have also

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“…The peaks centered at ∼230 nm are due to free gold (III) chloride ions of gold salt 46 and peaks at ∼300 nm correspond to the gold clusters composed of few gold atoms after reduction, mostly formed in the initial stage of the growth of the nanoparticle. 47 The peaks centered at ∼540 nm originate from the surface plasmon resonance (SPR) of the AuNPs and the buildup of these peaks with increase in the salt concentration confirms the formation of the nanoparticles. 48 The maximum absorbance at SPR for 0.5 wt% P85 is found to be for 0.004 wt% HAuCl 4 · 3H 2 O and thereafter this peak decreases as well as broadens with increase in the gold salt concentration.…”

Section: Resultsmentioning

confidence: 95%

Concentration Effect on Tuning of Block Copolymer-Mediated Synthesis of Gold Nanoparticles

Ray¹,

Aswal²,

Srivastava³

2010

j nanosci nanotechnol

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Synthesis of gold nanoparticles has been examined using triblock copolymer Pluronic P85 (EO26PO39EO26) at different concentrations as a function of hydrogen tetrachloroaureate (III) hydrate (HAuCl4 x 3H2O) in aqueous solution. The concentration of P85 block copolymer was varied from 0.5 to 2 wt% at fixed temperature (30 degrees C) in presence of HAuCl4 x 3H2O in the range of 0.002 to 0.2 wt% for each P85 concentration. The surface plasmon resonance in the time-dependent UV-visible spectra reveals that increase in the block copolymer concentration increases the yield of the gold nanoparticles but decreases their stability. Both small-angle neutron scattering (SANS) and dynamic light scattering (DLS) show that the number density of block copolymer micelles increase almost linearly with the concentration, which is related to result in higher numbers of nucleation centers and therefore increase in the yield of gold nanoparticles. The fact that increase in the number density of nanoparticles also increases the chances of aggregation and this tends to decrease the stability at higher block copolymer concentration. Transmission electron microscopy (TEM) images confirm the larger sizes of the nanoparticles formed in these systems at higher concentrations.

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Effect of Hydrophobicity inside PEO−PPO−PEO Block Copolymer Micelles on the Stabilization of Gold Nanoparticles: Experiments

Cited by 77 publications

References 46 publications

Self-assembled surfactant cyclic peptide nanostructures as stabilizing agents

Self-assembled surfactant cyclic peptide nanostructures as stabilizing agents

Block copolymer mediated stabilization of sub-5 nm superparamagnetic nickel nanoparticles in an aqueous medium

Concentration Effect on Tuning of Block Copolymer-Mediated Synthesis of Gold Nanoparticles

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