Synthesis of polyzwitterionic carbon dots with superior friction and fatigue control behaviors under water lubrication

Mou, Zihao; Yan, Ruixin; Peng, Jie; Liu, Ying; Huang, Zhangyi; Wang, Zhijun; Zhao, Baojun; Xiao, Dan

doi:10.1016/j.cej.2023.142986

Cited by 29 publications

(6 citation statements)

References 65 publications

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“…In Figure e, the detailed O 1s spectra primarily comprise CO bonds (531.9 eV) and H–O–C groups (533.5 eV). Moreover, the spectrum of S 2p can be resolved into two peaks corresponding to S–O and S–C bonds, positioned at 168.4 and 169.8 eV, respectively . Above all, a mixed carbon core created by CC/CO bonds and multiple groups (CN, –NH 2 , −OH···) on CDs surface were identified by XPS and responded to those of FT-IR analysis.…”

Section: Resultsmentioning

confidence: 99%

Red Dual-Emissive Carbon Dots for Cu²⁺ Selective Detection and Dynamical Monitoring

Pan,

Xu,

Cai

et al. 2024

ACS Appl. Nano Mater.

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Monitoring the copper ion (Cu 2+ ) levels has attracted considerable attention due to its significance in environmental and physiological applications. Here, we report on red dualemission carbon dots (CDs) with a 43% quantum yield and without excitation wavelength dependence for probing Cu 2+ in vitro and in vivo. The solid coordination of Cu 2+ with the surface groups of CDs generates an asynchronous fluorescent quenching of CDs and enables ultrasensitive detection of Cu 2+ in vitro. The intensity ratio of fluorescence at 605 and 650 nm (F 605 /F 650 ) shows a linear response to Cu 2+ concentration ranging from 0 to 1.1 μM, with an ultralow detection sensitivity of 0.58 nM. Moreover, the asprepared CDs show good stability, anti-interference capability, low cellular toxicity, and exceptional ability to penetrate plant cell walls, endowing the CDs with excellent bioimaging potentials and tracking the dynamic levels of Cu 2+ in living cells.

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Section: Resultsmentioning

confidence: 99%

Red Dual-Emissive Carbon Dots for Cu²⁺ Selective Detection and Dynamical Monitoring

Pan,

Xu,

Cai

et al. 2024

ACS Appl. Nano Mater.

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“…However, excessive additive content would lead to their reunion, and then higher COF will appear. 53 1.5 wt % N,S-CDs(BTH) exhibit optimal lubricating properties. The results of antiwear are consistent with that of friction reduction, with minimum roughness and wear volume when the sample contains 1.5 wt % CDs (Figure S15).…”

Section: ■ Results and Discussionmentioning

confidence: 99%

Dynamic Directional Ultrasonically In Situ-Generated N,S-Codoped Carbon Dots in Poly(ethylene glycol) for Improved Tribological Performance

Jin,

Cui,

Wang

et al. 2024

ACS Appl. Mater. Interfaces

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The dispersion stability of nanomaterials in lubricants significantly influences tribological performance, yet their addition as lubricant additives often presents challenges in secondary dispersion. Here, we present a straightforward method for in situ preparation of N,S-codoped CDs (N,S-CDs)-based lubricants using heterocyclic aromatic hydrocarbons containing N/ S elements in poly(ethylene glycol) (PEG) base oil by a directional ultrasound strategy. Two types of N,S-CDs were successfully prepared via the directional ultrasound treatment of PEG with benzothiazole (BTA) and benzothiadiazole (BTH) separately. The resultant N,S-CDs have a uniform distribution of N and S elements and maintain good colloidal dispersion stability in PEG even after 9 months of storage. The N,S-CDs can enter the surface gap of the friction pairs and then induce a tribochemical reaction. Benefiting from the synergistic effect of N and S activating elements, a robust and stable protective film consisting of iron sulfides, iron oxides, carbon nitrides, and amorphous carbonaceous compounds is formed, thus endowing N,S-CDs-based lubricants with improved antiwear and friction-reducing performance. Compared with pure PEG, the coefficient of friction (COF) of the N,S-CDs(BTH)-based lubricant decreased to 0.108 from 0.292, accompanied by a 91.2% reduction in wear volume, and the maximum load carrying capacity increased to 450 from 150 N.

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“…S11c, ESI†) can be assigned to the oxygen species in C–O–Fe. 37–40 However, the low Fe content in CNT-D-O-Fe (0.15 wt%, Table S1, ESI†) makes it difficult to confirm the chemical valence state and the corresponding fine structure of the iron single atoms only based on the XPS analysis. Therefore, the XAFS spectroscopy is further used to precisely explore the fine structure of CNT-D-O-Fe including the coordination environment and chemical state of the iron site.…”

Section: Resultsmentioning

confidence: 99%

Defect-stabilized and oxygen-coordinated iron single-atom sites facilitate hydrogen peroxide electrosynthesis

et al. 2023

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Synthesis of polyzwitterionic carbon dots with superior friction and fatigue control behaviors under water lubrication

Cited by 29 publications

References 65 publications

Red Dual-Emissive Carbon Dots for Cu²⁺ Selective Detection and Dynamical Monitoring

Red Dual-Emissive Carbon Dots for Cu²⁺ Selective Detection and Dynamical Monitoring

Dynamic Directional Ultrasonically In Situ-Generated N,S-Codoped Carbon Dots in Poly(ethylene glycol) for Improved Tribological Performance

Defect-stabilized and oxygen-coordinated iron single-atom sites facilitate hydrogen peroxide electrosynthesis

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Synthesis of polyzwitterionic carbon dots with superior friction and fatigue control behaviors under water lubrication

Cited by 29 publications

References 65 publications

Red Dual-Emissive Carbon Dots for Cu2+ Selective Detection and Dynamical Monitoring

Red Dual-Emissive Carbon Dots for Cu2+ Selective Detection and Dynamical Monitoring

Dynamic Directional Ultrasonically In Situ-Generated N,S-Codoped Carbon Dots in Poly(ethylene glycol) for Improved Tribological Performance

Defect-stabilized and oxygen-coordinated iron single-atom sites facilitate hydrogen peroxide electrosynthesis

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Red Dual-Emissive Carbon Dots for Cu²⁺ Selective Detection and Dynamical Monitoring

Red Dual-Emissive Carbon Dots for Cu²⁺ Selective Detection and Dynamical Monitoring