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Stabilty and thermophysical of hybrid nanolubricant

Stabilty and thermophysical of hybrid nanolubricant / Muhammad Aiman Saufi
Bendalir nano hybrid ialah penyelidikan yang baru, dihasilkan dengan mencampurkan dua atau lebih nanopartikel yang berbeza sama ada dalam bentuk campuran atau komposit dalam cecair asas. Tujuan eksperimen ini adalah untuk menilai kestabilan dan sifat termofizik functionalized multi-walled carbon nanotube (F-MWCNT), graphene dan hybrid F-MWCNT/Gr nanopartikel di dalam minyak poliester untuk pemampat penyaman udara. Pemerhatian visual menunjukkan bahawa pemendapan pelincir nano graphene bermula selepas 1 hari proses sonikasi dan F-MWCNT tidak menunjukkan pemendapan sehingga 14 hari. Bagi hibrid F-MWCNT/Gr (nisbah 0.025:0.075 vol%) menunjukan pemendapan. F-MWCNT dan graphene pada 0.1 vol% menunjukkan peningkatan konduksi terma yang tertinggi sebanyak 3.7% manakala bagi hibrid pelincir nano pula dengan nisbah 0.05:0.05vol% menunjukkan peningkatan sebanyak 6.7%. Kelikatan 0.1 vol% pelincir nano pada 40 ˚C dan 100 ˚C dengan penambahan nanopartikel F-MWCNT menunjukkan 40.65% dan 97.19%. Sementara itu, dengan penambahan surfaktan menunjukkan peningkatan sebanyak 53.48% dan 137.54%. Bagi graphene, kenaikan sebanyak 1.5% dan 1.0%, dengan penambahan surfaktan pula menunjukkan peningkatan sebanyak 7.07% dan 94.7%. Sementara itu, pelincir nano F-MWCNT/Gr hibrid meningkat sehingga 14.84% dan 63.38%. Dengan penambahan surfaktan, ia menunjukkan peningkatan 21.32% dan 94.7%. Oleh itu, SDBS tidak sesuai digunakan untuk minyak hibrid F-MWCNT/Gr/polyester kerana ia tidak meningkatkan kesatbilannya. Konduksi terma dan kelikatan meningkat dengan kepekatan nanopartikel. _______________________________________________________________________________________________________ Hybrid nanolubricants are new types of research which can be prepared by suspending two or more dissimilar nanoparticles either in a mixture or composite form in the base fluids. The aim of this experiment is to evaluate the stability and thermophysical properties of the functionalized multi-walled carbon nanotubes (F-MWCNT), graphene and hybrid F-MWCNT/Gr nanoparticle in polyester oil as nanolubricant for air conditioning compressor. Visual inspection shows graphene nanolubricant sedimentation started after 1 day from sonication process and F-MWCNT shows no sedimentation until 14 days while for hybrid F-MWCNT/Gr/polyester oil (0.025:0.075 vol% ratio) shows sedimentation. With addition of surfactant, the stability of low concentration of graphene nanoparticle improve more than higher concentration. F-MWCNT and graphene at 1 vol% shows the highest thermal conductivity enhancement of 3.7% while for hybrid nanolubricant with ratio 0.05:0.05 vol% shows improvement of 6.7%. The viscosity of the 0.1 vol% nanolubricant at 40 ˚C and 100 ˚C with addition of F-MWCNT nanoparticle shows 40.65% and 97.19%. While with surfactant shows 53.48% and 137.54% of enhancement. For graphene, increment of 1.5% and 1.0%, with addition of surfactant shows enhancement of 7.07% and 94.7% at 40˚C and 100˚C. Meanwhile, hybrid F-MWCNT/Gr nanolubricant increased up to 14.84% and 63.38%. With the addition of surfactant, it shows increment of 21.32% and 94.7%. Therefore, SDBS is not suitable for hybrid F-MWCNT/Gr/polyester oil as it does not improve its stability. The thermal conductivity and viscosity increased with nanoparticle concentration.
Contributor(s):
Muhammad Aiman Saufi - Author
Primary Item Type:
Final Year Project
Identifiers:
Accession Number : 875007945
Language:
English
Subject Keywords:
nanolubricants; nanoparticles; (F-MWCNT)
First presented to the public:
8/1/2020
Original Publication Date:
10/6/2020
Previously Published By:
Universiti Sains Malaysia
Place Of Publication:
School of Aerospace Engineering
Citation:
Extents:
Number of Pages - 124
License Grantor / Date Granted:
  / ( View License )
Date Deposited
2020-10-06 15:22:26.374
Submitter:
Mohd Jasnizam Mohd Salleh

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