Aqueous-Organic Phase Transfer of Gold and Silver Nanoparticles Using Thiol-Modified Oleic Acid

López-Millán, Alejandra; Zavala-Rivera, Paul; Esquivel, Reynaldo; Carrillo, Roberto; Álvarez, E.; Moreno-Corral, Ramón; Guzmán-Zamudio, Roberto; Lucero‐Acuña, Armando

doi:10.3390/app7030273

Cited by 18 publications

(11 citation statements)

References 25 publications

(29 reference statements)

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“…In 1707 cm −1 , was found the characteristic band of the carbonyl group present in said fatty acid corresponding to the C=O stretching of the carbonyl. Moreover, in the spectrum for L-cysteine (CYS), we observe in 3163 cm −1 the representative band of the N-H stretch of the amino group, the characteristic vibrations of the thiol group S-H can be observed in 2550 cm −1 , and the C-S link appears in the 635 cm −1 [ 15 , 24 , 25 ]. Finally, the spectrum for the oleic acid and L-cysteine bioconjugate (MAT) was obtained from a solid-state sample.…”

Section: Resultsmentioning

confidence: 99%

Synthesis and Characterization of a Bioconjugate Based on Oleic Acid and L-Cysteine

et al. 2021

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One of the main challenges facing materials science today is the synthesis of new biodegradable and biocompatible materials capable of improving existing ones. This work focused on the synthesis of new biomaterials from the bioconjugation of oleic acid with L-cysteine using carbodiimide. The resulting reaction leads to amide bonds between the carboxylic acid of oleic acid and the primary amine of L-cysteine. The formation of the bioconjugate was corroborated by Fourier transform infrared spectroscopy (FTIR), Raman spectroscopy, and nuclear magnetic resonance (NMR). In these techniques, the development of new materials with marked differences with the precursors was confirmed. Furthermore, NMR has elucidated a surfactant structure, with a hydrophilic part and a hydrophobic section. Ultraviolet-visible spectroscopy (UV-Vis) was used to determine the critical micellar concentration (CMC) of the bioconjugate. Subsequently, light diffraction (DLS) was used to analyze the size of the resulting self-assembled structures. Finally, transmission electron microscopy (TEM) was obtained, where the shape and size of the self-assembled structures were appreciated.

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Section: Resultsmentioning

confidence: 99%

Synthesis and Characterization of a Bioconjugate Based on Oleic Acid and L-Cysteine

et al. 2021

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“…The thiol-termination ligand was generated based on the method of López-Millán et al 9 The process of generating gold NPs with thiol-termination ligands is shown in Figure 1. 0.3654 g N,N'-dicyclohexylcarbodiimide was added to a test tube and dissolved in 4 mL of methanol.…”

Section: Methods and Resultsmentioning

confidence: 99%

“…In general, it is easier to synthesis gold NPs in a size and shape controllable process in aqueous solution than in organic solvents 9 and the gold NPs we bought from Sigma-Aldrich are also in aqueous solution. Thanks to previous research about transferring gold NPs from an aqueous solution to organic solvent with thiol ligands, 9,10 it may become possible to transfer gold NPs from aqueous solution based on citrate buffer to refractive index matching liquid based on paraffin oil in this paper. This paper includes five sections.…”

Section: Introductionmentioning

confidence: 99%

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Light scattering and rheological effects in an optical fibre coupled nanoparticle suspension

Wang

Benedictus

Groves

2020

Optical Sensing and Detection VI

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This study forms the first part of research into enhancing the forward and back scattering of light in an optical fibre using nanoparticles (NPs). This approach has the potential to enhance the sensitivity of optical fibre sensing by increasing the signal-to-noise ratio. The work described in this paper is focused on understanding the scattering of light by a suspension of NPs in refractive index matching liquid. It was noted early in the experimental work that rheological effects related to the viscosity and flow of the liquid affect the scattered light measured and therefore these effects are considered in the analysis. Gold nanoparticles in the tens to hundreds of micrometre size range were selected as the scattering particles based on their optical properties. These are suspended in a refractive index liquid with a similar refractive index to the optical fibre core. Effort was needed to transfer the NPs from their aqueous sodium citrate solution to the paraffin based solution. We investigated two types of interaction with the optical fibre: (i) dropping the NP suspension onto the end of a single-mode optical fibre and (ii) using the NP suspension as an interface between two single-mode optical fibres. It was noted that the surface tension of the liquid, the diameter of the fibre and the spacing between the fibres in case (ii) influence the reflected and transmitted light. In case of excess liquid, droplets flowed down the fibre and interestingly in case (ii) modified the reflected and forward transmitted light as it passed across the fibre interface. Our initial findings are that the influence of the gap between two optical fibres decreased after dropping refractive index liquid into the gap after fibre collimation, which is a beneficial result for understanding the influence of scattered light from a liquid containing NPs. Note, the position between the two fibres can also change due to the weight of the droplet and the fibre ends had to be re-collimated to investigate the influence of the moving droplets. These results will be expanded by additional experiments and modelling of the scattering from the nanoparticales and droplets.

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“…Colloidal AuNPs show a narrow peak centred at 524 nm that indicates formation of stable AuNPs with diameter of 27.8 nm according to equation (1) :

d = 2.99 λ_{\max} - 1539

where d (nm) and λ max (nm) are the diameter of nanoparticles and wavelength of absorption peak, respectively. Position and shape of the SPR band depend on the size and form of particles, as well as on the surrounding medium . In the case of AuNPs in aqueous solutions, position at 520–530 nm corresponds to particles of less than 30 nm in diameter.…”

Section: Resultsmentioning

confidence: 99%

Effect of surface modification with various thiol compounds on colloidal stability of gold nanoparticles

Mazloomi‐Rezvani

Salami‐Kalajahi

Roghani‐Mamaqani

et al. 2017

Applied Organom Chemis

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Gold nanoparticles (AuNPs) are attractive materials due to their special optical and electronic properties. However, they tend to aggregate particularly in the presence of thiol‐containing compounds. In this study, to investigate the effect of surface conjugation with thiol‐containing compounds on colloidal stability, thiol compounds with various structures as modifying agents were used. To this end, AuNPs were synthesized and stabilized by trisodium citrate in aqueous solution, and then modified with thiol‐containing compounds, namely cysteamine hydrochloride (MEA, containing primary amine groups), 2‐mercaptoethanol (BME, containing hydroxyl groups), 1‐dodecanthiol (LCA, containing long‐chain alkyl groups) and thioglycolic acid (TGA, containing carboxylic acid groups). We studied the effect of thiol ligands on solution stability of colloidal AuNPs and on the formation of aggregates originating from the modification process using UV–visible spectroscopy, dynamic light scattering, field emission scanning electron microscopy and transmission electron microscopy. Results showed that surface modification with MEA, BME and LCA led to the formation of aggregates. However, conjugation with TGA showed a concentration‐dependent behaviour: surface modification with low concentration resulted in the formation of aggregates whereas that with high concentration of TGA did not disturb the colloidal stability of AuNPs. Finally, the effect of surface modification on temperature increase of solutions originating from infrared light irradiation was studied, where the temperature increase depends on the surface‐modifying compound.

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Aqueous-Organic Phase Transfer of Gold and Silver Nanoparticles Using Thiol-Modified Oleic Acid

Cited by 18 publications

References 25 publications

Synthesis and Characterization of a Bioconjugate Based on Oleic Acid and L-Cysteine

Synthesis and Characterization of a Bioconjugate Based on Oleic Acid and L-Cysteine

Light scattering and rheological effects in an optical fibre coupled nanoparticle suspension

Effect of surface modification with various thiol compounds on colloidal stability of gold nanoparticles

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