Surface‐enhanced Raman scattering as a tool to study cationic surfactants exhibiting low critical micelle concentration

Mathioudakis, Georgios N.; Beobide, Amaia Soto; Bokias, Georgios; Koutsoukos, Petros G.; Voyiatzis, George A.

doi:10.1002/jrs.5798

Cited by 12 publications

(5 citation statements)

References 43 publications

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“…Two broad Raman band regions have been observed. The first region, which is at low wavenumbers (between 700 and 1600 cm –1 ), includes CH 2 scissoring and CH 2 twisting/wagging modes. , The second region between 2800 and 3000 cm –1 corresponds to the C–H stretching mode of CTAB. − We also measured the Raman spectrum of CTAB powder (brown curve in Figure a), and the results reveal two broad Raman regions that are similar to those of the CTAB sample in solution (yellow curve in Figure a). This proves the observed Raman signal in the electrolyte is related to the CTAB molecules.…”

Section: Resultsmentioning

confidence: 91%

Hydrogen Peroxide Electrosynthesis in a Strong Acidic Environment Using Cationic Surfactants

Adler,

Zhang,

Feng

et al. 2024

Precision Chemistry

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The two-electron oxygen reduction reaction (2e − -ORR) can be exploited for green production of hydrogen peroxide (H 2 O 2 ), but it still suffers from low selectivity in an acidic electrolyte when using non-noble metal catalysts. Here, inspired by biology, we demonstrate a strategy that exploits the micellization of surfactant molecules to promote the H 2 O 2 selectivity of a low-cost carbon black catalyst in strong acid electrolytes. The surfactants near the electrode surface increase the oxygen solubility and transportation, and they provide a shielding effect that displaces protons from the electric double layer (EDL). Compared with the case of a pure acidic electrolyte, we find that, when a small number of surfactant molecules were added to the acid, the H 2 O 2 Faradaic efficiency (FE) was improved from 12% to 95% H 2 O 2 under 200 mA cm −2 , suggesting an 8-fold improvement. Our in situ surface enhanced Raman spectroscopy (SERS) and optical microscopy (OM) studies suggest that, while the added surfactant reduces the electrode's hydrophobicity, its micelle formation could promote the O 2 gas transport and its hydrophobic tail could displace local protons under applied negative potentials during catalysis, which are responsible for the improved H 2 O 2 selectivity in strong acids.

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Section: Resultsmentioning

confidence: 91%

Hydrogen Peroxide Electrosynthesis in a Strong Acidic Environment Using Cationic Surfactants

Adler,

Zhang,

Feng

et al. 2024

Precision Chemistry

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“…The migration release study is considered important since, in various applications (e.g., smart food packaging materials), potential release of the filler into a dispersion medium (e.g., food) may result in severe consequences. To establish the appropriate experimental conditions for such a study, several directives/regulations have been proposed [ 40 , 41 , 42 ]. To that end, a release evaluation method using an accredited migration cell and a solution of 50% v/v EtOH were used.…”

Section: Resultsmentioning

confidence: 99%

Fe(II) Spin Crossover/Polymer Hybrid Materials: Investigation of the SCO Behavior via Temperature-Dependent Raman Spectroscopy, Physicochemical Characterization and Migration Release Study

et al. 2021

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Polymeric composites constitute an appealing class of materials with applications in various fields. Spin crossover (SCO) coordination complexes are switchable materials with potential use in data storage and sensors. Their incorporation into polymers can be considered an effective method for their wider practical application. In this study, Fe(II) SCO/polylactic acid hybrid polymeric composites have been prepared by film casting. The mononuclear coordination complex [Fe{N(CN)2}2(abpt)2] was incorporated into polylactic acid. The morphological, structural and thermoanalytical characterization of the composite films were performed via scanning electron microscopy (SEM), attenuated total reflectance (ATR/FTIR), Raman spectroscopy and differential scanning calorimetry (DSC). In addition, the migration release study (MRS) of the SCO compound from the polymeric matrix into the food simulant 50% v/v water/ethanol solution was also examined via UV/Vis absorption. Of particular interest was the investigation of the SCO behavior of the coordination complex after its incorporation into the polymer matrix; it was accomplished by temperature-dependent micro-Raman spectroscopy. The described attempt could be considered a preparatory step toward the development of SCO-based temperature sensors integrated into food packaging materials.

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“…To evaluate the size and stability of AgNPs, the fresh silver colloids were stored at 4 • C in the dark for 48 h, and the UV-Vis spectra and nanopotential were recorded at 0, 4, 8, 24, and 48 h. The UV-Vis spectra of silver colloids were obtained using a UV-Vis spectrometer (UV-1700, Shimadzu, Japan), and the full width at half absorption maximum was calculated to evaluate the size and stability of AgNPs (Leopold and Lendl, 2003). The size of AgNPs was measured using a Zetasizer Nano ZS (Malvern, United Kingdom) nanoparticle size analyzer (Mathioudakis et al, 2020).…”

Section: Preparation Of Silver Nanoparticlesmentioning

confidence: 99%

Improvement of Surface-Enhanced Raman Scattering Method for Single Bacterial Cell Analysis

Yan

Nie

et al. 2020

Front. Bioeng. Biotechnol.

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Surface-enhanced Raman scattering (SERS) is a useful tool for label-free analysis of bacteria at the single cell level. However, low reproducibility limits the use of SERS. In this study, for the sake of sensitive and reproducible Raman spectra, we optimized the methods for preparing silver nanoparticles (AgNPs) and depositing AgNPs onto a cell surface. We found that fast dropwise addition of AgNO 3 into the reductant produced smaller and more stable AgNPs, with an average diameter of 45 ± 4 nm. Compared with that observed after simply mixing the bacterial cells with AgNPs, the SERS signal was significantly improved after centrifugation. To optimize the SERS enhancement method, the centrifugal force, method for preparing AgNPs, concentration of AgNPs, ionic strength of the solution used to suspend the cells, and density of the cells were chosen as impact factors and optimized through orthogonal experiments. Finally, the improved method could generate sensitive and reproducible SERS spectra from single Escherichia coli cells, and the SERS signals primarily arose from the cell envelope. We further verified that this optimal method was feasible for the detection of low to 25% incorporation of 13 C isotopes by the cells and the discrimination of different bacterial species. Our work provides an improved method for generating sensitive and reproducible SERS spectra.

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Surface‐enhanced Raman scattering as a tool to study cationic surfactants exhibiting low critical micelle concentration

Cited by 12 publications

References 43 publications

Hydrogen Peroxide Electrosynthesis in a Strong Acidic Environment Using Cationic Surfactants

Hydrogen Peroxide Electrosynthesis in a Strong Acidic Environment Using Cationic Surfactants

Fe(II) Spin Crossover/Polymer Hybrid Materials: Investigation of the SCO Behavior via Temperature-Dependent Raman Spectroscopy, Physicochemical Characterization and Migration Release Study

Improvement of Surface-Enhanced Raman Scattering Method for Single Bacterial Cell Analysis

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