Stability, rheology, and thermophysical properties of surfactant free aqueous single-walled carbon nanotubes and graphene nanoplatelets nanofluids: a comparative study

Alyamac-Seydibeyoglu E., Fidan-Aslan T., TURGUT A., SEYDİBEYOĞLU M. Ö.

JOURNAL OF DISPERSION SCIENCE AND TECHNOLOGY, cilt.44, sa.2, ss.299-308, 2023 (SCI-Expanded) identifier identifier

  • Yayın Türü: Makale / Tam Makale
  • Cilt numarası: 44 Sayı: 2
  • Basım Tarihi: 2023
  • Doi Numarası: 10.1080/01932691.2021.1947849
  • Dergi Adı: JOURNAL OF DISPERSION SCIENCE AND TECHNOLOGY
  • Derginin Tarandığı İndeksler: Science Citation Index Expanded (SCI-EXPANDED), Scopus, Academic Search Premier, PASCAL, Aerospace Database, BIOSIS, Chemical Abstracts Core, Chimica, Communication Abstracts, Compendex, Food Science & Technology Abstracts, INSPEC, International Pharmaceutical Abstracts, Metadex, Civil Engineering Abstracts
  • Sayfa Sayıları: ss.299-308
  • Anahtar Kelimeler: Stability, aqueous carbon nanofluids, graphene nanoplatelets, single-walled carbon nanotubes, zeta potential, THERMAL-CONDUCTIVITY ENHANCEMENT, BEHAVIOR, AGGREGATION, ENERGY
  • Dokuz Eylül Üniversitesi Adresli: Evet

Özet

A comparative study, for the first time, was conducted on thermophysical and rheological properties of single-walled carbon nanotubes (SWCNT) and graphene nanoplatelets (GNP) nanofluids. Highly stable aqueous 0.5, 1.0, and 2.0 wt% SWCNT and GNP nanofluids were successfully prepared with no surfactant, through ultrasound technology. The preparation was explained in detail, adjusting pH to around 8 where nanofluids would be expected to be stable. The highest zeta potential of -60.5 mV was obtained for 2.0 wt% SWCNT nanofluids. Shear thinning was observed for all nanofluids at low shear rates. Unlike shear thickening of GNP, Newtonian behavior of SWCNT nanofluids was detected at high shear rate region. The effect of ultrasound technology was directly verified by scanning electron microscopy (SEM), resulting in GNP size reduction and separation of bundles for SWCNT. The results revealed that SWCNT nanofluids showed a remarkable zeta potential value for heat transfer systems compared to GNP nanofluids.