rdf-syntax-grammar
mods:
  schema location: http://www.loc.gov/mods/v3 http://www.loc.gov/standards/mods/v3/mods-3-2.xsd
  title info:
    title: Thermal conductivity enhancements of ironoxide graphene hybrid nanofluids
  name:
    name part: Arifutzzaman, A.K.H.A. Ma
    role:
      role term: creator
    role:
      role term: author
  name:
    name part: International Islamic University Malaysia
    name part: Kulliyyah of Engineering
  genre: Theses, IIUM local
  origin info:
    place:
      place term: my
    date issued: 2019
  language:
    language term: eng
  physical description:
    extent: xxvii, 218 leaves : colour illustrations ; 30cm.
  abstract: Heat transfer fluids (HTFs) have characteristically poor heat transfer transport efficiency due to their low thermal conductivities (TC’s) which significantly limits their application as coolant in modern high-tech industries. A number of studies have been conducted using ironoxide particle dispersed nanofluids to expand the TC of HTFs. However, due to the necessity of large quantities of heat transfers, ironoxide nanofluids are not a very widespread solution for wide usage. Incorporation of high thermal conductive material in a nanofluid enhances the TC of the prepared hybrid nanofluid. Graphene (Gr) is the most comparable carbon-based nanomaterial, due to its exponentially high TC and enormously large surface area with negligible thickness. Therefore, the main aim of this research study was to evaluate the TC enhancements of the developed novel ironoxide-Gr hybrid nanofluid system. In this purpose, at the first phase, the TC of deionized water (DW) based maghemite (MH) ironoxide nanoparticle dispersed (MH/DW) nanofluids was investigated. Spherical shape MH nanoparticles were successfully synthesized using the wet chemical co-precipitation technique with the average crystallite size of around 20 nm. Results showed that MH/DW nanofluids exposed very good stability against sedimentation. The maximum TC enhancement of MH/DW nanofluids was perceived for the MH concentration of 0.157 mg/ml among the analyzed samples. At 25 oC, it provided ~ 4.5 % enhancements of the TC over the DW and then it reached to about ~ 32 % in 60 oC temperature. In the second phase, systematic TC analysis of exfoliated Gr dispersion in DW was conducted separately with increasing temperatures. Few layered Gr flakes were effectively processed using sonication assisted liquid phase exfoliation (LPE) technique separately in two different solvents, N-Methyl-2-Pyrrolidone (NMP) and N, N-dimethylformamide (DMF) with a systematic centrifugation (500 - 4000 rpm) scheme. For the fixed time of sonication,…
  note: by A.K.H.A. Ma Arifutzzaman
  note: Abstracts in English and Arabic.
  note: "A thesis submitted in fulfilment of the requirement for the degree of Doctor of Philosophy (Engineering)." --On title page.
  note: Thesis (Ph.D)--International Islamic University Malaysia, 2019.
  note: Includes bibliographical references (leaves 192-212).
  subject:
    geographic code: a-my---
  subject:
    topic: Nanofluids
  subject:
    topic: Graphene
  subject:
    topic: Heat
    topic: Transmission
  classification: TJ853.4
  identifier: http://studentrepo.iium.edu.my/handle/123456789/9687
  record info:
    record content source: UIAM
    record creation date: 190315
    language of cataloging:
      language term: eng