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Stable aqueous dispersions of reduced graphene oxide with 1-pyrenesulphonic acid sodium salt

Başlık çevirisi mevcut değil.

  1. Tez No: 403138
  2. Yazar: GÖKHAN HEKİMOĞLU
  3. Danışmanlar: DR. ARAVIND VIJAYARAGHAVAN
  4. Tez Türü: Yüksek Lisans
  5. Konular: Metalurji Mühendisliği, Metallurgical Engineering
  6. Anahtar Kelimeler: Belirtilmemiş.
  7. Yıl: 2016
  8. Dil: İngilizce
  9. Üniversite: The University of Manchester
  10. Enstitü: Yurtdışı Enstitü
  11. Ana Bilim Dalı: Belirtilmemiş.
  12. Bilim Dalı: Belirtilmemiş.
  13. Sayfa Sayısı: 78

Özet

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Özet (Çeviri)

Graphene as a 2-dimensional nanostructure of carbon has attracted a huge interest because of its extraordinary mechanical, electronic, high surface area and thermal properties. However, graphene is still in early stage of commercial applications due to two major problems which are about scalable synthetic routes and the quality of processed graphene. Additionally, graphene should be dispersed into an aqueous or organic media so as to harness its unique electrical and physical properties. For instance, for certain applications of graphene such as coating, inks and biomedical applications, it will be beneficial to have graphene dispersed in aqueous solutions. Yet, strong attractive van der Walls forces between graphene sheets are a barrier preventing dispersion in most solvents due to the tendency to aggregation. This project aims to develop and obtain the stable aqueous dispersions of reduced graphene oxide at high concentrations and with large flake size by using PySA. Firstly, in this project, the steps for preparation of solutions to final stage for obtaining stable aqueous dispersion of reduced graphene oxide at large scale were introduced. Secondly we investigated the effects of fundamental dispersion parameters by preparing 28 different samples with regard to initial concentration of graphene, graphene to stabiliser ratio and pH, according to the obtained data the best dispersion protocol was determined. All samples were analysed by optical microscope, SEM, Raman spectroscopy, UV-vis and AFM. Results showed that the highest concentration (0,7 mg/ml) of stable aqueous dispersion of rGO with large flake size can be achieved with a low (initial) pH, a stabiliser concentration of 2:1 by weight GO and an initial GO concentration of 1 mg/ml.

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