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Characterization of Rapidly Exfoliated 2D Nanomaterials Obtained Using Compressible Flows

Islam, Md Akibul
http://rave.ohiolink.edu/etdc/view?acc_num=toledo1544704770760853

Abstract Details

2018, Master of Science, University of Toledo, Mechanical Engineering.
Two-dimensional (2D) nano-materials are finding numerous applications in next generation electronics, consumer goods, energy generation and storage, and healthcare. The rapid rise of utility and applications for 2D nano-materials necessitates developing means for their mass production. Here, we detail a new compressible flow exfoliation (CFE) method for producing 2D nano-materials using a multiphase flow of 2D layered materials suspended in a high pressure gas undergoing expansion. The expanded gas-solid mixture is sprayed in a suitable solvent, where a significant portion (up to 10% yield) of the initial hexagonal boron nitride material is found to be exfoliated with a mean thickness of 4.2 nm. The exfoliation is attributed to the high shear rates ( >105 s-1) generated by supersonic flow of compressible gases inside narrow orifices and converging-diverging channels. This method has significant advantages over current 2D material exfoliation methods, such as chemical intercalation and exfoliation, as well as liquid phase shear exfoliation, with the most obvious benefit being the fast, continuous nature of the process. Another significant advantage of this process is producing low defect layered materials. The existing methods like liquid sonication, shear exfoliation and ball milling processes are aggressive techniques which induce significant amount of defect in the 2D materials structure. In the second part of this work, we proved that the compressible flow exfoliation induces less defect than other popular methods. The existing methods are also highly solvent dependent. In our work, we provided evidence that our process is solvent independent and efficient exfoliation can be achieved in a broader range of solvents. Thus, scaling this process will reduce the cost of exfoliation a lot while maintaining a better fake quality.
Dr. Reza Rizvi (Committee Chair)
Dr. Matthew Liberatore (Committee Member)
Dr. Ahalapitiya Jayatissa (Committee Member)
114 p.
Mechanical Engineering
2D Materials, Exfoliation, Graphene, Boron Nitride, Molybdenum di Sulphide, Shear, CD Nozzle, Defect, Raman

Recommended Citations

Citations

  • Islam, M. A. (2018). Characterization of Rapidly Exfoliated 2D Nanomaterials Obtained Using Compressible Flows [Master's thesis, University of Toledo]. OhioLINK Electronic Theses and Dissertations Center. http://rave.ohiolink.edu/etdc/view?acc_num=toledo1544704770760853

    APA Style (7th edition)

  • Islam, Md Akibul. Characterization of Rapidly Exfoliated 2D Nanomaterials Obtained Using Compressible Flows. 2018. University of Toledo, Master's thesis. OhioLINK Electronic Theses and Dissertations Center, http://rave.ohiolink.edu/etdc/view?acc_num=toledo1544704770760853.

    MLA Style (8th edition)

  • Islam, Md Akibul. "Characterization of Rapidly Exfoliated 2D Nanomaterials Obtained Using Compressible Flows." Master's thesis, University of Toledo, 2018. http://rave.ohiolink.edu/etdc/view?acc_num=toledo1544704770760853

    Chicago Manual of Style (17th edition)

toledo1544704770760853
548
© 2018, some rights reserved.Creative Commons License Characterization of Rapidly Exfoliated 2D Nanomaterials Obtained Using Compressible Flows by Md Akibul Islam is licensed under a Creative Commons Attribution-NonCommercial-NoDerivs 3.0 Unported License. Based on a work at etd.ohiolink.edu.
This open access ETD is published by University of Toledo and OhioLINK.