Surface analysis of bio-inspired pistia leaves / Najibah Ab Latif

Bio-inspired surface is getting more attention in engineering applications. It allows mankind to take ideas from nature and mimic those ideas into various technology of structures, products and devices. On a close-up, surface in nature have micro and nano structures desirable and useful for engineer...

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Main Author:	Ab Latif, Najibah
Format:	Thesis
Language:	English
Published:	2020
Subjects:	Carbon nanotubes Nanoparticles Nanostructured materials
Online Access:	https://ir.uitm.edu.my/id/eprint/33765/1/33765.pdf
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id	my-uitm-ir.33765
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spelling	my-uitm-ir.337652022-03-29T03:54:28Z Surface analysis of bio-inspired pistia leaves / Najibah Ab Latif 2020-05 Ab Latif, Najibah Carbon nanotubes. Nanoparticles. Nanostructured materials Bio-inspired surface is getting more attention in engineering applications. It allows mankind to take ideas from nature and mimic those ideas into various technology of structures, products and devices. On a close-up, surface in nature have micro and nano structures desirable and useful for engineering applications. Many, including Lotus and Roses, have been researched and the characteristics have been successfully translated to advanced engineering surfaces. Hairy structures on leaves surfaces have different characteristics which will affect the behaviour of fluid flow. Pistia Stratiotes or 'Kiambang'; for example, has intrinsic oleophilicity surfaces which has not been widely explored. Thus, in this research, the structures of mature Pistia Stratiotes leaves were reproduced using casting method. Four different composites were fabricated which included epoxy, nanocomposites of graphene-filled, multiwalled carbon nanotube (MWCNT)-filled and nanoclay-filled. Three different types of oil namely palm oil, palm oil + TiO2 and VG 68 oil were tested for static friction coefficient for real and inspired surfaces. The kinematic viscosity at 40 °C and 60 °C of oils was measured using capillary tube kinematic viscometer. The surface tension at 25 °C, 40 °C and 60 °C of oil was measure using DuNouy ring method tensiometer. The density of oil was conducted using temperature regulator attached with hydrometer. The morphological structures of the samples were observed using Variable Pressure Scanning Electron Microscope (VP-SEM) and Dinolite digital microscope. The wettability and oleophilicity behaviour of the real and inspired surfaces were measured using contact angle meter. The surface roughness of the pistia-inspired was examined using noncontact Alicona profilometer. The heat distribution of heated oils droplets at two different temperatures (40 °C and 60 °C) was also recorded to see the heat contour map and flow characteristics of the inspired surfaces. The patterns contours were captured using Infrared thermal imaging camera. Based on the experimental data, the microstructure of inspired surface was observed to be almost similar to the real surfaces for each nanocomposites material. The oil contact angle for palm oil, palm oil + Ti02 and VG 68 on mature pistia leaves exhibited good oleophilicity with the value of 72.75 °, 5.49 ° and 6.21 ° respectively. The results for four inspired surfaces with similar types of oil (palm oil, palm oil + TiO2 and VG 68) were also recorded and VG 68 oil droplet on graphene-filled exhibited the highest category called superoleophilicity as the value approaches 0°. For COF, mature pistia leaves exhibited the lowest values of 0.3057, 0.2309 and 0.3249, while graphene-filled inspired surfaces exhibited superior values of 0.3057, 0.3049 and 0.3488 for the case of palm oil, palm oil + TiO2 and VG 68, respectively. In terms of surface roughness epoxy inspired surface recorded the highest value of 15.643. Oil surface tension and oil viscosity decreased when temperature increased for oil used. However, the heat distribution of the heated oil droplet affected the flow spread and the droplet temperature decreased after 30 s to 35 s the surface was tested. In conclusion, this oleophilicity screening on the pistia surface structure is useful as an alternative solution for tribological applications. 2020-05 Thesis https://ir.uitm.edu.my/id/eprint/33765/ https://ir.uitm.edu.my/id/eprint/33765/1/33765.pdf text en public phd doctoral Universiti Teknologi MARA Shah Alam Faculty of Mechanical Engineering Kasolang, Salmiah (Prof Dr )
institution	Universiti Teknologi MARA
collection	UiTM Institutional Repository
language	English
advisor	Kasolang, Salmiah (Prof Dr )
topic	Carbon nanotubes Nanoparticles Nanostructured materials
spellingShingle	Carbon nanotubes Nanoparticles Nanostructured materials Ab Latif, Najibah Surface analysis of bio-inspired pistia leaves / Najibah Ab Latif
description	Bio-inspired surface is getting more attention in engineering applications. It allows mankind to take ideas from nature and mimic those ideas into various technology of structures, products and devices. On a close-up, surface in nature have micro and nano structures desirable and useful for engineering applications. Many, including Lotus and Roses, have been researched and the characteristics have been successfully translated to advanced engineering surfaces. Hairy structures on leaves surfaces have different characteristics which will affect the behaviour of fluid flow. Pistia Stratiotes or 'Kiambang'; for example, has intrinsic oleophilicity surfaces which has not been widely explored. Thus, in this research, the structures of mature Pistia Stratiotes leaves were reproduced using casting method. Four different composites were fabricated which included epoxy, nanocomposites of graphene-filled, multiwalled carbon nanotube (MWCNT)-filled and nanoclay-filled. Three different types of oil namely palm oil, palm oil + TiO2 and VG 68 oil were tested for static friction coefficient for real and inspired surfaces. The kinematic viscosity at 40 °C and 60 °C of oils was measured using capillary tube kinematic viscometer. The surface tension at 25 °C, 40 °C and 60 °C of oil was measure using DuNouy ring method tensiometer. The density of oil was conducted using temperature regulator attached with hydrometer. The morphological structures of the samples were observed using Variable Pressure Scanning Electron Microscope (VP-SEM) and Dinolite digital microscope. The wettability and oleophilicity behaviour of the real and inspired surfaces were measured using contact angle meter. The surface roughness of the pistia-inspired was examined using noncontact Alicona profilometer. The heat distribution of heated oils droplets at two different temperatures (40 °C and 60 °C) was also recorded to see the heat contour map and flow characteristics of the inspired surfaces. The patterns contours were captured using Infrared thermal imaging camera. Based on the experimental data, the microstructure of inspired surface was observed to be almost similar to the real surfaces for each nanocomposites material. The oil contact angle for palm oil, palm oil + Ti02 and VG 68 on mature pistia leaves exhibited good oleophilicity with the value of 72.75 °, 5.49 ° and 6.21 ° respectively. The results for four inspired surfaces with similar types of oil (palm oil, palm oil + TiO2 and VG 68) were also recorded and VG 68 oil droplet on graphene-filled exhibited the highest category called superoleophilicity as the value approaches 0°. For COF, mature pistia leaves exhibited the lowest values of 0.3057, 0.2309 and 0.3249, while graphene-filled inspired surfaces exhibited superior values of 0.3057, 0.3049 and 0.3488 for the case of palm oil, palm oil + TiO2 and VG 68, respectively. In terms of surface roughness epoxy inspired surface recorded the highest value of 15.643. Oil surface tension and oil viscosity decreased when temperature increased for oil used. However, the heat distribution of the heated oil droplet affected the flow spread and the droplet temperature decreased after 30 s to 35 s the surface was tested. In conclusion, this oleophilicity screening on the pistia surface structure is useful as an alternative solution for tribological applications.
format	Thesis
qualification_name	Doctor of Philosophy (PhD.)
qualification_level	Doctorate
author	Ab Latif, Najibah
author_facet	Ab Latif, Najibah
author_sort	Ab Latif, Najibah
title	Surface analysis of bio-inspired pistia leaves / Najibah Ab Latif
title_short	Surface analysis of bio-inspired pistia leaves / Najibah Ab Latif
title_full	Surface analysis of bio-inspired pistia leaves / Najibah Ab Latif
title_fullStr	Surface analysis of bio-inspired pistia leaves / Najibah Ab Latif
title_full_unstemmed	Surface analysis of bio-inspired pistia leaves / Najibah Ab Latif
title_sort	surface analysis of bio-inspired pistia leaves / najibah ab latif
granting_institution	Universiti Teknologi MARA Shah Alam
granting_department	Faculty of Mechanical Engineering
publishDate	2020
url	https://ir.uitm.edu.my/id/eprint/33765/1/33765.pdf
_version_	1783734251650285568

Surface analysis of bio-inspired pistia leaves / Najibah Ab Latif

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