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Title: Novel treatments of nano- and micro-sized diamond powders
Author: Astuti, Yayuk
ISNI:       0000 0004 5353 7661
Awarding Body: University of Newcastle Upon Tyne
Current Institution: University of Newcastle upon Tyne
Date of Award: 2014
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This thesis concerns the novel treatments of detonation nanodiamond including deagglomeration, surface modification, evaporation and particle alignment. Moreover, the application of de-agglomeration and surface modification method in high-pressure hightemperature (HPHT)-microdiamond for industrial interest was also conducted. The first treatment is the de-agglomeration of detonation nanodiamond clusters to achieve isolated nanodiamond particles. The de-agglomeration of detonation nanodiamond was conducted by applying beads milling followed simultaneously by grafting of 1-undecene on nanodiamond surfaces. As a result, well-dispersed and isolated nanodiamond particles (spherical in shape with an average diameter of 5 nm) in the powder form with undecyl-passivated surfaces were achieved which were verified by scanning transmission electron microscopy (STEM) images, X-ray photoemission electron spectroscopy (XPS) and fourier transform infrared (FTIR) spectra. The second treatment is evaporation and alignment of undecyl detonation nanodiamond in vacuum at ~200 °C onto transmission electron microscopy (TEM) grids and a mica surfaces. The evaporation and deposition of nanodiamonds onto a mica surface resulted in particle alignment with length scales of 500 μm confirmed using photoluminescence micro-imaging. Moreover, luminescence emission property of undecyl detonation nanodiamond before and after evaporation was also observed. The photoluminescence emission spectra demonstrated that both undecyl detonation nanodiamond before and after evaporation emitted the luminescence photon in the range of 2.48-1.55 eV (500- 800 nm) which is characteristic for nanodiamond with size of 5 nm. Finally, the de-agglomeration and surface modification of microdiamond by applying method used to separate detonation nanodiamond clusters with the intention of investigation of the applicability of the method on the bigger particle sizes (microdiamond) resulted in most diamond microcrystalline particles were distributed individually on the stub surfaces confirmed by SEM images. Furthermore, the FTIR demonstrated that the alkyl group (undecyl-) were attached on the surfaces of microdiamond particles.
Supervisor: Not available Sponsor: Directorate General of Higher Education, Ministry of Education and Culture, Republic of Indonesia ; Diponegoro University
Qualification Name: Thesis (Ph.D.) Qualification Level: Doctoral
EThOS ID:  DOI: Not available