One-pot synthesis and lubricity of fluorescent carbon dots applied on PCL-PEG-PCL hydrogel

Abstract

This work presents a method for one-pot synthesis of N-doped nanometer-size carbon dots, which can be assembled with thermosensitive poly(ε-caprolactone)-poly(ethylene glycol)-poly(ε-caprolactone) (PCL-PEG-PCL, PCEC) hydrogel to achieve slow-release lubricity. The typical property of this green production was studied by fourier transform infrared (FT-IR), X-ray diffraction (XRD), X-ray photoelectron spectroscopy (XPS) and transmission electron microscope (TEM). The photoluminescence of composite PCEC/CDs hydrogel and its released solutions were characterized by ultraviolet spectrum, and the rheological properties were tested by rotary rheometer. Tribological performance of the released solution from composite PCEC/CDs hydrogel was obtained to compare with PBS and pure CDs solution. The experimental results reveal that the CDs contain the chemical groups of N-H, C-OH/C-O-C and -COOH, etc. In addition, the diameter of the CDs is in the range of 6~8 nm. The phase transition behavior of PCEC/CDs hydrogel can be still kept and its viscoelasticity hydrogel is improved by approximatively 7%. Furthermore, friction coefficient of the released solution from composite PCEC/CDs hydrogel decreases by about 70% than that of PBS. Besides, the wear condition can be improved by a lubricating transfer film formed by released CDs. This novel strategy for slow-release application is valuable for drug delivery and bio-tribology.

Precursor-dependent structural diversity in luminescent carbonized polymer dots (CPDs): the nomenclature

“…CPD materials exhibiting various novel functions can be fabricated by selecting the appropriate precursors. CPD materials can be used as lubricants 61 , anticorrosive agents 62 , and antioxidants 63 . They can also be used for the upregulation of glycolysis 64 .…”

The Application of Nano-MoS2 Quantum Dots as Liquid Lubricant Additive for Tribological Behavior Improvement

“…The MoS2 QDs play a decisive role in the improvement of the tribological performance. The Because the spherical MoS 2 QDs function as ball-bearing lubricants in the process of friction, they can be adsorbed onto the slide track by adding MoS 2 QDs to pure paroline oil to prevent the frictional component from contacting it directly [30,31]. In summary, the synergistic lubrication effect of the tribo-film, the improvement of the bearing capacity, and the ball-bearing effect together lead to the lowest friction and wear.…”

Luminescent chitosan/carbon dots as an effective nano-drug carrier for neurodegenerative diseases

“…These tracers will help us understand the path followed by the nanocarriers encapsulating the drug, and the process by which these drug molecules are delivered to the target. 24,25 Hence carbon nanodots are an ideal ller that can be used to synthesize a nanocarrier suitable to deliver drug across the blood brain barrier.…”