Stability of lauric acid at high pressure studied by Raman spectroscopy and picosecond acoustics

Albahrani, Sayed; Ayrinhac, Simon; Gauthier, Michel; Decremps, F.; Lisiecki, Isabelle; Constanzo, Salvatore; Colomban, Philippe

doi:10.1140/epjb/e2018-90479-7

Cited by 5 publications

(2 citation statements)

References 38 publications

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“…The main difference with spectrum of lauric acid 76–79 is the appearance of a broad band around 535 cm −1 . This broadness is consistent with the signature of an inorganic metal oxide phase, the shell.…”

Section: Resultsmentioning

confidence: 91%

Multiscale identification of the inorganic shell of core (Co)/shell‐assembled nanoparticles

Simon,

Costanzo,

Lisiecki

et al. 2024

J Raman Spectroscopy

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Core (Co)/shell (Co‐oxide) nanoparticles assembly exhibits interesting magnetic properties that depend on the inorganic shell characteristic (composition and crystalline structure). Assemblies of pure and partially oxidized cobalt (core/shell) nanoparticles, ~9 nm in diameter, were prepared and analyzed by techniques probing the matter at macroscale to nanoscale: UV–visible‐near‐infrared (NIR) transmission, FTIR, Raman microspectroscopy, and transmission electron microscopy. Attention is paid to compare nonoxidized and (partially) oxidized Co nanoparticles, coated with lauric acid as stabilizing agent (ligands). The approximately 1 nm disordered inorganic coating is perfectly detected by transmission electron microscopy, UV–visible–NIR, infrared, and Raman spectroscopy. The Raman spectrum is sensitive to laser wavelength and power due to the local heating induced by the laser, which modifies the interaction between the organic chains and the nanoparticle inorganic shell. For comparison, nanoparticle films were analyzed under heating from room temperature to 300°C. The “fusion” (dynamic disorder) of lauric (dodecanoic) chains is observed concomitantly with the merging of very low wavenumber Lambs' modes into a Rayleigh wing, which is consistent with an increase in the topological nanoparticle disorder. Hydroxylation or water adsorption is observed for Co film. The UV–visible–NIR and Raman spectra of the Co‐oxide shell do not correspond to that of CoO (rock salt) nor to that of Co3O4 (spinel) but has some similarity to that of 2D delafossite (CoOOH) phase.

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Section: Resultsmentioning

confidence: 91%

Multiscale identification of the inorganic shell of core (Co)/shell‐assembled nanoparticles

Simon,

Costanzo,

Lisiecki

et al. 2024

J Raman Spectroscopy

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“…Thus, size effects that were meant for modifying mechanical properties appear not to be universally beneficial to other properties. Note that NPs come always with chemical surfactants grafted at their surfaces. − The use of surfactants is meant to control the NP growth and therefore their form and size . It is through the grafted surfactant at the interface that the NP–polymer interacts with the environment .…”

Section: Introductionmentioning

confidence: 99%

Enhancing Multifunctionality: Optimal Properties of Iron-Oxide-Reinforced Polyvinylidene Difluoride Unveiled Through Full Atom Molecular Dynamics Simulations

Bedoui,

Sahihi,

Jaramillo-Botero

et al. 2024

Langmuir

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Nanocomposites made of magnetite (Fe 3 O 4 ) nanoparticles (NP)s with different surface chemistry and polyvinyl difluoride (PVDF) polymer were investigated using full atom molecular dynamics (MD) simulation. NPs with hydroxyl (OH), hexanoic, and oleic acid terminations were considered in this study. The effect of each surface chemistry was investigated in terms of the mechanical properties, the distribution of the internal energy around the NP, and the chain polarization gradient from the interface to the bulk. From this investigation, we find that oleic acid termination, although the most popular, is less favorable for interfacial interaction and local polarization. The OH-terminated NP results in the best configuration for the properties investigated. The hexanoic acid-grafted NP presents a good compromise. Hydrogen bonding governs the induced response of the nanocomposites. Although the hexanoic acid grafted NP presents less hydrogen bonding than the OH-terminated case, the conformation of the hexanoic acid acts as a mobility flow inhibitor, leading to a performance comparable to that of the OH-terminated NP composite. This work led to investigating routes to make nanocomposite materials with optimized properties. These results shed light on the multiple combinations offered by nanocomposites that go beyond the conventional effects of size.

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Synthesis of tailored alumina supported Cu-based solids obtained from nanocomposites: Catalytic application for valuable aldehyde and ketones production

Carmo

Bezerra

Tehuacanero-Cuapa

et al. 2022

Materials Chemistry and Physics

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Stability of lauric acid at high pressure studied by Raman spectroscopy and picosecond acoustics

Cited by 5 publications

References 38 publications

Multiscale identification of the inorganic shell of core (Co)/shell‐assembled nanoparticles

Multiscale identification of the inorganic shell of core (Co)/shell‐assembled nanoparticles

Enhancing Multifunctionality: Optimal Properties of Iron-Oxide-Reinforced Polyvinylidene Difluoride Unveiled Through Full Atom Molecular Dynamics Simulations

Synthesis of tailored alumina supported Cu-based solids obtained from nanocomposites: Catalytic application for valuable aldehyde and ketones production

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