A colorimetric study of the interaction of cationic and anionic surfactants with anionic gold nanoparticles

Kazakova, Julia; García-Povea, Alejandro; Fernández-Palacios, Marta; Villar-Navarro, Mercedes; Carnerero, José M.; Jimenez‐Ruiz, Aila; Prado‐Gotor, Rafael

doi:10.1007/s00396-017-4186-6

Cited by 12 publications

(10 citation statements)

References 19 publications

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“…Recently, on the basis of the results of small-angle neutron scattering (SANS), small-angle X-ray scattering (SAXS) techniques, etc., Skoglund et al proposed that the negatively charged AgNPs were stabilized by CTAB cluster micelles rather than a double-layer structure of CTAB . Based on the color change of the negatively charged AuNPs induced by CTAB or CTAC at their concentrations exceeding the critical micelle concentration (CMC), a similar conclusion was also drawn. , Although the CTAB bilayer structure is easier to form on the facets of gold nanorods than on spherical gold nanoparticles, it is also possible to produce the bilayer structure of CTAB on the surface of negatively charged AuNPs.…”

Section: Introductionmentioning

confidence: 92%

“…31 Based on the color change of the negatively charged AuNPs induced by CTAB or CTAC at their concentrations exceeding the critical micelle concentration (CMC), a similar conclusion was also drawn. 32,33 Although the CTAB bilayer structure is easier to form on the facets of gold nanorods than on spherical gold nanoparticles, 2 it is also possible to produce the bilayer structure of CTAB on the surface of negatively charged AuNPs.…”

Section: ■ Introductionmentioning

confidence: 99%

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Study on the Assembly Structure Variation of Cetyltrimethylammonium Bromide on the Surface of Gold Nanoparticles

Wang

et al. 2020

ACS Omega

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In this work, the self-assembly behavior of cetyltrimethylammonium bromide (CTAB) on the surface of citrate-capped gold nanoparticles (AuNPs) in solution has been studied by UV−vis absorption spectroscopy, fluorescence probe techniques, ζ potentiometric methods, transmission electron microscopy, etc. The UV−vis spectra show that the color with the increase of CTAB for the mixture containing CTAB and a given amount of AuNPs changes from red to blue and then to red.The absolute value of ζ potential corresponding to this color change decreases initially and then increases. Specially, the reversible color change, from red to blue and then to red, could be observed only in the case of a gradual addition of a AuNP solution to a CTAB solution; however, this reversible change is not suitable for the mixture formed in a reverse order of mixing. The results from pyrene used as the fluorescence probe indicate that the features in the fluorescence spectrum (including fluorescence quenching, I 1 /I 3 , and the excimer) well correspond to those from the UV−vis spectrum mentioned above. Based on the experimental results, the mechanism of the assembly structure variation of CTAB on the surface of negatively charged AuNPs was proposed. For a given amount of AuNPs, the assembly structure of CTAB on the surface of AuNPs undergoes the transformation from a monolayer to a bilayer with the increase of CTAB. In the case of the concentration of CTAB far beyond its critical micelle concentration (CMC) and the higher ratio of CTAB and AuNPs, there is a possibility of the formation of an extra micellar structure only after the formation of a double-layer structure.

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Section: Introductionmentioning

confidence: 92%

Section: ■ Introductionmentioning

confidence: 99%

Study on the Assembly Structure Variation of Cetyltrimethylammonium Bromide on the Surface of Gold Nanoparticles

Wang

et al. 2020

ACS Omega

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“…Finally, the aggregates (based on either possible explanation) may have a much greater diameter than the original AgNS, which can be confirmed by a color change from dark green to brown (Figure 1). In accordance with the first explanation, it has been reported that cetyltrimethylammonium chloride (CTACl) cationic surfactant can interact with negatively charged AuNPs, with the aggregation confirmed by a color change from red to blue [38]. Whether the phase transfer can occur during vortexing can be determined largely by how well the AgNSs can be modified with the cationic surfactant to increase hydrophobicity, in which case the aggregates would still have a chance to meet other cationic surfactants aligned at the water/dichloromethane interface.…”

Section: Resultsmentioning

confidence: 65%

Complexes Formed by Hydrophobic Interaction between Ag-Nanospheres and Adsorbents for the Detection of Methyl Salicylate VOC

et al. 2019

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Surface-enhanced Raman spectroscopy (SERS) has been widely investigated in many applications. However, only little work has been done on using SERS for the detection of volatile organic compounds (VOCs), primarily due to the challenges associated with fabricating SERS substrates with sufficient hotspots for signal enhancement and with the surface interfacially compatible for the VOCs. This study investigated the phase transfer of Ag-nanospheres (AgNSs) from the aqueous phase to the non-aqueous phase by electrostatic interaction induced by cationic surfactants, and the feasibility of the transferred AgNSs as SERS substrates for the determination of methyl salicylate VOC. Results indicated that one of three cationic surfactants, tetraoctylammonium bromide (TOAB) dissolved in organic solvent showed successful phase transfer of the AgNSs confirmed by several characterization analyses. The complex formed by hydrophobic interaction between the transferred AgNSs and Tenax-TA adsorbent polymer was able to be utilized as a SERS substrate, and the volatile of methyl salicylate could be easily determined from SERS measurements at 4 h static volatile collection. Therefore, the proposed new techniques can be effectively employed to areas where many VOCs relevant to food and agriculture need to be analyzed.

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“…Information obtained through the use of UV–VIS techniques should also be complemented with TEM measurements if aggregation and medium effects, both subtypes of optical phenomena, must be distinguished. TEM measurements give information about the presence of AuNP aggregates and morphological changes of the clusters during the synthesis process in the presence of different ligands [ 30 , 45 ]. Employing air-dried samples ensures the elimination of all possible interferences from the suspension medium.…”

Section: Discussionmentioning

confidence: 99%

Encased Gold Nanoparticle Synthesis as a Probe for Oleuropein Self-Assembled Structure Formation

et al. 2020

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Stable oleuropein-coated gold nanoparticles in aqueous media were synthesized for the first time. Oleuropein (OLE) concentration in the reaction medium was found to greatly influence the outcome and stability of the resulting nanocolloid, with a marked decrease in particle size being found for the more concentrated oleuropein solutions. The protection mechanisms involved in the stabilized nanosystems were analyzed. Oleuropein self-assembled structures were found to be formed at a concentration threshold of [OLE] > 5 × 10−5 M, and observed through the use of CryoSEM imaging. Those structures were responsible for both the increased stability and the decrease in size observed at the more concentrated solutions.

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A colorimetric study of the interaction of cationic and anionic surfactants with anionic gold nanoparticles

Cited by 12 publications

References 19 publications

Study on the Assembly Structure Variation of Cetyltrimethylammonium Bromide on the Surface of Gold Nanoparticles

Study on the Assembly Structure Variation of Cetyltrimethylammonium Bromide on the Surface of Gold Nanoparticles

Complexes Formed by Hydrophobic Interaction between Ag-Nanospheres and Adsorbents for the Detection of Methyl Salicylate VOC

Encased Gold Nanoparticle Synthesis as a Probe for Oleuropein Self-Assembled Structure Formation

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