Surface Decoration of Cetyltrimethyl Ammonium Bromide on SiC Particles and Its Effects on the Co-Deposition Process

Wu, Houya; Li, Zhiyi; Wang, Yan; Zhu, Wenhui

doi:10.1021/acs.jpcb.0c09901

Cited by 2 publications

(3 citation statements)

References 36 publications

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“…20 The peak of CS-CTAB at 1457 cm À1 is the characteristic peak of the amine group from CTAB. 21 The characteristic peaks appearing at 1384 cm showed that the functional groups of CTAB were grafted successfully on the CS surface, which was consistent with the FT-IR spectral analysis results.…”

Section: Elemental Composition and Functional Groups Of Cs And Cs-ctabsupporting

confidence: 85%

“…The stretching vibration peaks of C=C appeared at 1618 cm −1 and 1616 cm −1 .The peak at 1541 cm −1 appears as a characteristic peak for the carbon skeleton vibration of C=C 20 . The peak of CS‐CTAB at 1457 cm −1 is the characteristic peak of the amine group from CTAB 21 . The characteristic peaks appearing at 1384 cm −1 and 1339 cm −1 are caused by the bending vibration of C‐H.…”

Section: Resultsmentioning

confidence: 98%

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Tribological properties of Cetyltrimethyl ammonium bromide modified CS as lubrication additive

Li,

Liu,

Liu

2024

Surface & Interface Analysis

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The coal indirect liquefied diesel soot (Coal‐to‐liquids diesel soot, CS) was collected by a self‐made soot trapper. CS was modified with cetyltrimethyl ammonium bromide (CTAB) and named as CS‐CTAB. The tribological properties of CS and CS‐CTAB in 10#white oil(10#WO) were tested on a WTM‐2E controlled atmosphere miniature friction and wear testing machine. The morphology, composition, and tribological mechanism of CS and modified CS‐CTAB were studied by using TEM, XPS, XRD, Raman, and other instruments. The results showed that CS modified by CTAB is wrapped and entangled in long chains. Their main structure components are all amorphous carbon with a small amount of graphite crystallites. The addition of CS‐CTAB (0.8 wt%) significantly reduces both AFC and wear rate, with reductions of 32.9% for AFC, and 65.6% for wear rate compared to no additive. The anti‐friction and anti‐wear effect of CS is greatly improved after being modified by CTAB. Mechanism analysis shows that CS as a lubricant additive, acts as a micro‐bearing in the friction process and falls off under the action of shear force to generate an independent graphite sheet, thus forming a graphite protective film on the surface of 304 stainless steel plate. However, CS has the defects of low graphitization degree, large particle size, and easy agglomeration. During friction, uneven adsorption of CS on the surface can worsen wear. However, CTAB modification can improve dispersion stability in 10#WO and effectively reduce wear on the friction surface.

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Section: Elemental Composition and Functional Groups Of Cs And Cs-ctabsupporting

confidence: 85%

Section: Resultsmentioning

confidence: 98%

Tribological properties of Cetyltrimethyl ammonium bromide modified CS as lubrication additive

Li,

Liu,

Liu

2024

Surface & Interface Analysis

View full text Add to dashboard Cite

show abstract

“…However, we expect surfactants such as cetrimonium bromide (CTAB) or perfluorooctanoic acid (PFOA) and perfluorooctanesulfonic acid (PFOS) (with the same monovalent charge but a significantly higher number of polarizable electrons along the carbon tail and larger surface coverage) to elicit large, distinguishable differences in χ (2) and Φ(0) tot relative to the alkali cations. We also chose these species due to their environmental and technological relevance − and specifically due to CTAB’s versatility of adopting multiple morphologies at interfaces that range from monomers to micelles to bilayers to adlayers. − …”

Section: Introductionmentioning

confidence: 99%

Quantification of Stern Layer Water Molecules, Total Potentials, and Energy Densities at Fused Silica:Water Interfaces for Adsorbed Alkali Chlorides, CTAB, PFOA, and PFAS

Chang,

Lozier,

et al. 2023

J. Phys. Chem. A

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We have employed amplitude- and phase-resolved second-harmonic generation spectroscopy to investigate ion-specific effects of monovalent cations at the fused silica:water interface maintained under acidic, neutral, and alkaline conditions. We find a negligible dependence of the total potential (as negative as −400 mV at pH 14), the second-order nonlinear susceptibility (as large as 1.5 × 10–21 m2 V–1 at pH 14), the number of Stern layer water molecules (1 × 1015 cm–2 at pH 5.8), and the energy associated with water alignment upon going from neutral to high pH (ca. −24 kJ mol–1 to −48 kJ mol–1 at pH 13 and 14, close to the cohesive energy of liquid water but smaller than that of ice) on chlorides of the alkali series (M+ = Li+, Na+, K+, Rb+, and Cs+). Attempts are presented to provide estimates for the molecular hyperpolarizability of the cations and anions in the Stern layer at high pH, which arrive at ca. 20-fold larger values for α total ions (2) = α M + (2) + α OH – (2) + α Cl – (2) when compared to water’s molecular hyperpolarizability estimate from theory and point to a sizable contribution of deprotonated silanol groups at high pH. In contrast to the alkali series, a pronounced dependence of the total potential and the second-order nonlinear susceptibility on monovalent cationic (cetrimonium bromide, CTAB) and anionic (perfluorooctanoic and perfluorooctanesulfonic acid, PFOA and PFOS) surfactants was quantifiable. Our findings are consistent with a low surface coverage of the alkali cations and a high surface coverage of the surfactants. Moreover, they underscore the important contribution of Stern layer water molecules to the total potential and second-order nonlinear susceptibility. Finally, they demonstrate the applicability of heterodyne-detected second-harmonic generation spectroscopy for identifying perfluorinated acids at mineral:water interfaces.

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Surface Decoration of Cetyltrimethyl Ammonium Bromide on SiC Particles and Its Effects on the Co-Deposition Process

Cited by 2 publications

References 36 publications

Tribological properties of Cetyltrimethyl ammonium bromide modified CS as lubrication additive

Tribological properties of Cetyltrimethyl ammonium bromide modified CS as lubrication additive

Quantification of Stern Layer Water Molecules, Total Potentials, and Energy Densities at Fused Silica:Water Interfaces for Adsorbed Alkali Chlorides, CTAB, PFOA, and PFAS

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