Sains Malaysiana: 37(3) : 227-232(2008)

Tribological Behaviour of OA-Capped WO₃ Nanoparticles

as an Additive to Base Oils

(Kelakuan Tribologi Nanozarah WO₃ Bersalut-OA sebagai

Penambah dalam Minyak Asas)

Siti Fazlili Abdullah

Department of Engineering Science and Mathematics

College of Engineering, Universiti Tenaga Nasional

Km 7, Jalan Kajang-Puchong

43009 Kajang, Selangor, Malaysia

Shahidan Radiman, Muhammad Azmi Abdul Hamid & Noor Baa’yah Ibrahim

School of Applied Physics, Faculty Science and Technology

Universiti Kebangsaan Malaysia, 43600 UKM Bangi

Selangor, Malaysia

Received: 12 June 2007 / Accepted: 21 September 2007

ABSTRACT

Oleic acid (OA) capped wolfram (VI) oxide, WO₃ nanoparticles were chemically synthesized and characterized by means of Fourier Transform-Infrared spectroscopy (FT-IR) and transmission electron microscopy (TEM).  The tribological properties of the capped WO₃ nanoparticles as an additive in base oils were investigated using a four-ball machine.  Results show that OA-capped WO₃ nanoparticles are able to prevent water adsorption and capable of being dispersed stable in organic solvents which is base oils. The as-prepared capped WO₃ nanoparticles have an average size of 15 nm.  In addition, OA-capped WO₃ nanoparticles as an additive in base oils perform good anti-wear (AW) and anti-friction (AF) properties owing to the formation of a boundary film.

Keywords: Nanoparticles; FT-IR; TEM; tribology

ABSTRAK

Nanozarah wolfram (VI) oksida, WO₃ bersalut asid oleik (OA) disintesis secara kimia dan dicirikan menggunakan spektroskopi infra merah transformasi fourier (FT-IR) dan mikroskopi elektron transmisi (TEM). Sifat-sifat tribologi nanozarah wolfram (VI) oksida, WO₃ bersalut sebagai penambah dalam minyak asas dikaji menggunakan alat tribo empat-bola. Keputusan menunjukkan nanozarah bersalut asid oleik (OA) dapat mengelak daripada berlakunya penjerapan air dan juga berselerak dengan stabil dalam pelarut organik iaitu minyak asas. Nanozarah WO₃ bersalut asid oleik (OA) mempunyai saiz purata 15 nm. Selain itu, nanozarah WO₃ bersalut asid oleik (OA) sebagai penambah dalam minyak asas menunjukkan bahawa ia dapat mengurangkan haus (AW) dan geseran (AF). Ini adalah disebabkan berlakunya pembentukan filem disempadan.

Kata kunci: Nanozarah; FT-IR; TEM; tribologi

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