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Magnetically Stimulable Graphene Oxide/Polypropylene Nanocomposites
Muhammad Nisar1, Griselda Barrera Galland2, Julian Geshev3
1Facultad de Ingeniería, Universidad Católica de la Santísima Concepción, Alonso de Ribera 2850, Concepción 4090541, Chile.
ACS Omega
|June 26, 2023
Summary
Researchers created magnetic polypropylene nanocomposites by dispersing metallic nanoparticles on thermally reduced graphene oxide. This method enhances thermal stability and transforms the polymer into a ferromagnetic material, overcoming aggregation issues for advanced applications.
Area of Science:
- Materials Science
- Nanotechnology
- Polymer Science
Background:
- Core-shell magnetic nanoparticles (MNPs) are of increasing interest for various applications.
- Achieving uniform MNP distribution in polymers is challenging due to aggregation.
- Supporting MNPs on nonmagnetic core-shell structures is a known strategy to mitigate aggregation.
Purpose of the Study:
- To develop magnetically active polypropylene (PP) nanocomposites using melt mixing.
- To investigate the effect of thermal reduction temperature of graphene oxide (GO) on MNP support.
- To characterize the structural, thermal, and magnetic properties of the resulting nanocomposites.
Main Methods:
- Thermal reduction of graphene oxide (GO) at 600 °C and 1000 °C.
- Dispersion of cobalt (Co) or nickel (Ni) nanoparticles onto thermally reduced graphene oxide (TrGO).
- Characterization using XRD, Raman spectroscopy, AAS, FT-IR, SEM, TGA, DSC, and water contact angle measurements.
Main Results:
- Metallic nanoparticles (Ni: 3.59 nm, Co: 4.25 nm) were successfully dispersed on TrGO.
- TrGO supports 9-12 wt% metallic nanoparticles, with reduction temperature having minimal impact.
- PP nanocomposites exhibited enhanced thermal stability (T_onset +34 °C, T_max +19 °C), improved crystallinity, and a transition from diamagnetic to ferromagnetic behavior.
Conclusions:
- Melt mixing of TrGO-supported metallic nanoparticles is an effective method for creating magnetically active PP nanocomposites.
- The nanocomposites show improved thermal and mechanical properties, along with ferromagnetic characteristics.
- This approach offers a viable route for developing advanced functional polymer materials.
