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All Journal Jurnal Sains Materi Indonesia Jurnal Metalurgi dan Material Indonesia
Wahyuaji Narottama Putra
Departemen Teknik Metalurgi Dan Material, Fakultas Teknik, Universitas Indonesia, Depok
Automotive Engineering Chemistry Engineering Industrial & Manufacturing Engineering Materials Science & Nanotechnology

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Effect of Sodium Dodecyl Benzene Sulfonate Addition as Surfactant in Carbon Nanofluid for Quench Medium Application Maulana Naufalino; Mohammad Ilham Daradjat; Ravanya Nabilla Ramadhani Parawansa; Benediktus Ma'dika; Ghiska Ramahdita; Sri Harjanto; Wahyuaji Narottama Putra
Jurnal Metalurgi dan Material Indonesia Vol. 1 No. 2 (2018): Desember
Publisher : Badan Kerja Sama Pendidikan Metalurgi dan Material (BKPMM)

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Abstract

Nanofluids, which are fluids containing suspensions of nanoparticles, have been reported to have higher thermal conductivity than conventional fluid, e.g. water, oil, etc. Because of this characteristic, nanofluids are very attractive in heat transfer applications, such as quenching medium for heat treatment process. This unique characteristic is caused by the nanoparticles inside the fluid that have higher thermal conductivity, thus perform better on heat absorption and heat transfer. By varying the nanoparticles content in the fluid base, the cooling rate can be controlled in accordance with the desired characteristics of the material. Carbon is used as a nanoparticle because of the low cost and environmental friendly characteristics, but still have relatively high thermal conductivity. Unfortunately, carbon nanoparticle is highly hydrophobic. Therefore, surface modification is needed by using surfactant in the nanofluids. In this paper, Sodium Dodecyl Benzene Sulfonate (SDBS) was used as surfactant from 1, 3, and 5% in 100 ml water-based nanofluid with 0.5% volume carbon. The carbon powder used in this research was commercial grade, and ball-milled for 10 hours at 500 rpm to reduce the particle size. Commercially available household bodycare product which contain SDBS was used for surfactant source. Scanning Electron Microscope (SEM) showed that the particle size after milling were roughly 10 µm. Medium carbon steel, S45C, was heated at 1000°C for 1 hour, and then quenched using this nanofluid. Microstructure observation showed martensite phase formation after quenching. Hardness test confirmed this phase, showing hardness up to 949 HV after quenching using surfactant added nanofluid.
Observasi Nanofluid dengan TiO2 sebagai Partikel Nano dan Sodium Dodecyl Benzene Sulfonate sebagai Surfaktan untuk Aplikasi Media Quench Andreas Sugiarto; Aldi Alfarizi; Luthfi Dali Ahmad; Setyoaji Fajar Negara; Ghiska Ramahdita; Sri Harjanto; Wahyuaji Narottama putra
Jurnal Metalurgi dan Material Indonesia Vol. 2 No. 2 (2019): Agustus
Publisher : Badan Kerja Sama Pendidikan Metalurgi dan Material (BKPMM)

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Heating and cooling process in heat treatment is a common process to increase the mechanical properties of steel component. Rapid cooling, or quenching, is needed to change the microstructure to obtain the desire hardness. Recently, nanofluid is widely used as a medium for quenching because of their advantage in heat thermal conductivity compared with conventional medium such as water or oil. Nanofluid is a liquid with high thermal conductivity nanoparticle suspended in the fluid base. The variation of nanoparticles content in nanofluids could control the cooling rate to optimize the desired characteristics of a material. TiO2 is widely used as nanoparticle because of its high thermal conductiviy, relatively cheap and environmental friendly. To improve the suspension of TiO2 nanoparticle in nanofluid, surfactant is added. In this research, Commercial grade TiO2 powder was used as nanoparticle, and common household bodycare which contain Sodium Dodecyl Benzene Sulfonate (SDBS) was used as the source of surfactant. The nanofluid was produced by mixing 100 ml water with 0.1% volume TiO2, and additional 1%, 3%, and 5% SDBS surfactant as variation. Before mixing, the TiO2 powder were milled at 500 rpm for 10 hours. This nanofluid was then used as quenching medium. The steel used as sample in this experiment was S45C medium carbon steel, heated at 1000°C for 1 hour. Scanning Electron Microscope (SEM) was used to determine the TiO2 particle size after milling, and showed roughly less than 100 nm. Microstructure observation showed martensite phase formation after quenching. Hardness test confirmed this phase, showing hardness up to 954 HV after quenching using surfactant added nanofluid.
EFFECT OF H2O2 AND MnO2 AS OXIDATORS OF GOLD AND COPPER LEACH PROCESSES FROM PRINTED CIRCUIT BOARDS Yudha Pratesa; Aji Wibisono; Wahyuaji Narottama Putra; Yunita Sadeli; A. Zakiyuddin; Sri Harjanto
Jurnal Sains Materi Indonesia Vol 20, No 3: APRIL 2019
Publisher : Center for Science & Technology of Advanced Materials - National Nuclear Energy Agency

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (794.453 KB) | DOI: 10.17146/jsmi.2019.20.3.4710

Abstract

In general, electronic waste management in the form 2 of printed circuit boards (printed circuit boards/PCBs) is carried out by the process of removing components and taking precious metals that are easily recycled. However, in Indonesia, the recycling process for extracting precious metals has not been much processed, even though they contain precious metals such as copper and gold. This research was conducted to find a more economical and environmentally friendly treatment process by using an oxidizer of Hydrogen Peroxide (H2O2) and Manganese Oxide (MnO2) and reducing the level of HCl used. Observation of metal leaching results using Atomic Adsroption Spectroscopy (AAS) showed the value of recovery (recovery) of gold and copper reached 59.1% and 59.8% for 0.5M HCl + 2.5% H2O2. However, the recovery value of copper has reached its optimum point at the addition of 1.5% H2O2. The use of 3% & 5% MnO2 results in recovery values of 12% and 24% for gold and copper. Observation of the cross section shows the dissolution of the copper metal from the PCB and accompanied by a change in the color of the solution from clear to green, the more concentrated the more the amount of dissolved copper metal shows the characteristic of CuCl solution. The results of the comparison of the two types of oxidizers show that H2O2 is better than MnO2 in producing higher Cu and Au metals more than 3 times.
Co-Authors A. Zakiyuddin Aji Wibisono Aldi Alfarizi Andreas Sugiarto Benediktus Ma'dika Ghiska Ramahdita Luthfi Dali Ahmad Maulana Naufalino Mohammad Ilham Daradjat Ravanya Nabilla Ramadhani Parawansa Setyoaji Fajar Negara Sri Harjanto Sri Harjanto Yudha Pratesa Yunita Sadeli