Details

Autor(en) / Beteiligte

• Lavi, Adi
• Pyrikov, Michael
• Ohayon-Lavi, Avia
• Tadmor, Rafael
• Shachar-Michaely, Gal
• Leibovitch, Yelena
• Ruse, Efrat
• Vradman, Leonid
• Regev, Oren

Titel

Total exfoliation of graphite in molten salts

Ist Teil von

• Physical chemistry chemical physics : PCCP, 2023-01, Vol.25 (3), p.2618-2628

Ort / Verlag

England: Royal Society of Chemistry

Erscheinungsjahr

2023

Quelle

Alma/SFX Local Collection

Beschreibungen/Notizen

• The exfoliation of graphite to graphene nanoplatelets (GnP) in a molten salt medium is investigated in this study. It is shown that this mechanical force-free process yielded a large-sized GnP product (>15 microns) with a low defect density. The effect of the surface tension of the molten salt on graphite exfoliation efficiency was investigated for a series of alkali chloride salts (CsCl, KCl, NaCl and eutectic NaCl-KCl) at 850 °C. It was demonstrated that the produced GnP could be completely and easily separated from the salt. Molten salt with the lowest value of surface tension (CsCl) displayed the highest wettability of the graphitic layers and hence facilitated total exfoliation of the graphite to GnP. The exfoliation of graphite in molten salts is applicable in the thermal energy storage field, as well as in exfoliation of other layered materials. Herein, it is demonstrated that the thermal conductivity of the GnP-CsCl composite is enhanced by ∼300% compared to the neat salt. Total exfoliation of graphite to graphene nanoplatelets in molten salts is demonstrated. The wetting properties of various alkali chloride salts have a major effect on the exfoliation efficiency of graphite.