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All Journal INDONESIAN JOURNAL OF APPLIED PHYSICS Jurnal Asiimetrik: Jurnal Ilmiah Rekayasa Dan Inovasi Jurnal Polimesin
Muhamad Taufik Ulhakim
Universitas Buana Perjuangan Karawang
Astronomy Automotive Engineering Civil Engineering, Building, Construction & Architecture Computer Science & IT Control & Systems Engineering Electrical & Electronics Engineering Energy Engineering Industrial & Manufacturing Engineering Materials Science & Nanotechnology Mechanical Engineering Physics

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The Qualitative Stability and Thermal Properties Investigation of TiO2-EG/W Nanofluids Through Experimental Validation Muhamad Taufik Ulhakim; Sukarman; Khoirudin; Nazar Fazrin; Tomas Irfani; Amri Abdulah
Jurnal Asiimetrik: Jurnal Ilmiah Rekayasa dan Inovasi Volume 6 Nomor 1 Tahun 2024
Publisher : Fakultas Teknik Universitas Pancasila

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.35814/asiimetrik.v6i1.5882

Abstract

Over the past two decades, researchers have been extremely interested in developing TiO2 nanofluids for heat exchanger applications. Therefore, this study evaluates the performance of employing TiO2 nanofluids, which were prepared using ethylene glycol (EG) and distilled water as the base fluid, then called TiO2-EG/W. The qualitative stability and thermal conductivity properties were measured through the experimental investigation. XRD and SEM analyses were also carried out to investigate the structures of TiO2 nanoparticles used in terms of their crystalline and morphological structures. The results showed a positive impact of stability even for 15 days, and after that, the nanoparticles dropped to the sedimentation by about 58%. Then, the highest thermal conductivity at the temperature of 80 °C was increased by about 17.08% compared to the base fluid. Supported by the results of XRD and SEM analysis, respectively, highlight that TiO2 nanoparticles have a rutile phase with an average crystallite size of 20.23 nm and are small spherical in morphology. This paper also provided the challenge and future perspective of TiO2 nanofluid to appear as an innovation for the development of TiO2 nanofluid in the further studies of heat exchanger applications.
Determining The Crystallite Size of TiO2/EG-Water XRD Data Using the Scherrer Equation Muhamad Taufik Ulhakim; Sukarman Sukarman; Khoirudin Khoirudin; Nazar Fazrin; Tomas Irfani; Afif Hakim
INDONESIAN JOURNAL OF APPLIED PHYSICS Vol 14, No 1 (2024): April
Publisher : Department of Physics, Sebelas Maret University

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.13057/ijap.v14i1.79195

Abstract

X-ray diffraction (XRD) data and the Scherrer equation were utilized to analyze the crystallite Size of titanium dioxide (TiO2) in a solution of ethylene glycol (EG) and distilled water. The XRD analysis was conducted using a Rigaku Miniflex 600 instrument with an X-ray wavelength of approximately 0.15046 nm. The examination yielded the full-width half maximum (FWHM), which was subsequently examined using the Scherrer equation. This experiment employed TiO2 with a purity level of 99.8% and a crystal Size of 30 nm. The analysis revealed that the average crystallite Size of TiO2 in the sample is 19.45 nm, with the highest measurement at about 30.38 nm. The Spearman correlation equation was employed to validate the outcomes. The Spearman's correlation coefficient between the FWHM variable and the crystallite Size of TiO2 nanoparticles is -0.958. These findings shed light on the crystal structure of TiO2 under these conditions. These findings lend support to the use of TiO2 in a variety of nanotechnology applications. However, more research is needed to understand fully how crystallite-Size TiO2 nanoparticles work in different settings and to find the best ways to prepare samples, including understanding the specific phase and how it affects the stability of fluids. This research contributes significantly to the understanding of the properties of TiO2 in a solution of distilled water and EG, as well as to the characterization of nanomaterials, with particular emphasis on issue 9 of the SDGS Goal concerning industry, innovation, and infrastructure.
A framework for surface profile optimization in sinker-edm via response surface methodology Rohman Rohman; Sukarman Sukarman; Muhamad Taufik Ulhakim; Danang Supriyanto
Jurnal Polimesin Vol 23, No 1 (2025): February
Publisher : Politeknik Negeri Lhokseumawe

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.30811/jpl.v23i1.5741

Abstract

Sinker Electrical Discharge Machining (SEDM) is a powerful technique used for shaping hard materials and creating complex designs. SEDM effectively machines hardened steel, titanium, and tungsten carbide, materials challenging for conventional methods. This study aims to identify the optimal surface profile (Ra) as a response variable in the SEDM process. This study utilized hardened SKD11 as the workpiece and graphite as the electrode, employing Response Surface Methodology (RSM) for optimization. The investigation focused on the pulse current, spark-on time, and gap voltage as the input parameters. The findings revealed that Sample 7 achieved the smoothest surface (at Ra = 10 µm), while Sample 13 had the roughest (at Ra = 20 µm). The analysis of these results determined the ideal conditions for the pulse current at level 1, spark-on time at level 3, and gap voltage at level 3, resulting in a surface profile of 10.2 microns. The successful application of RSM optimization in SEDM significantly contributes to the precision machining of alloy steels, which plays a crucial role in material-processing operations.
Co-Authors Afif Hakim Amri Abdulah Danang Supriyanto Khoirudin Khoirudin Khoirudin Nazar Fazrin Rohman Rohman Sukarman Sukarman Tomas Irfani