Prefacedoi: 10.1088/1757-899X/857/1/011001pmid: N/A
The 5th International Conference on Science, Technology, and Interdisciplinary Research (IC-STAR) is organized by Faculty of Engineering, Universitas Lampung, has been held on 23-25 September, 2019 in Bandar Lampung, INDONESIA. IC-STAR 2019 highlighting on the current growth in engineering, science and interdisciplinary research. IC-STAR 2019 theme is “Interdisciplinary Research for Knowledge Advances for Nation Building”.IC-STAR accomplished as a forum to exchange and to discuss information in the most advanced scientific fields related to the research and development in the field of science, engineering and technology, and their inter-discipline subjects among participants from the world’s academia, industries, and governments. The Conference also provides a platform for collaborations among professional societies and to enhance technical exchanges among participants.We are committed on increasing the quality of the papers through a fruitful peer-review based on the originality, impact, novelty, and the relevance to the area of the conference. The published papers were selected from IC-STAR conference 2019 submitted and presented paper.The committee would like to thank you all distinguished keynote speakers, authors, and reviewers for their contribution that have made this conference a forum of exchange, enlightening and network. Also, for all steering committee and organizing committee member and staff that plan and make the conference possible. We do hope that you would find this publication as an enjoyable and useful guide and reference.Editorial board:Khairudin, Faculty of Engineering, Universitas Lampung, IndonesiaDenni Kurniawan, Faculty of Engineering, Universiti Teknologi Brunei, Brunei DarussalamJoni Agustian, Faculty of Engineering, Universitas Lampung, IndonesiaAhmad Kafrawi Nasution, Faculty Engineering, Universitas Muhammadiyah Riau, IndonesiaHery Dian Septama, Faculty of Engineering, Universitas Lampung, Indonesia
Peer review statementdoi: 10.1088/1757-899X/857/1/011002pmid: N/A
All papers published in this volume of IOP Conference Series: Materials Science and Engineering have been peer reviewed through processes administered by the proceedings Editors. Reviews were conducted by expert referees to the professional and scientific standards expected of a proceedings journal published by IOP Publishing.
Synthesis of chitosan-SiO2 composite for adsorption methyl dyes from solutionRiyanti, F; Hariani, P L; Fatma, ; Yuliasari, N; Said, M; Ramadiati, T
doi: 10.1088/1757-899X/857/1/012001pmid: N/A
Synthesis of chitosan-SiO2 composite has been done using the precipitation method. The chitosan-SiO2 composite was applied to removal methyl red dyes from the solution. The chitosan-SiO2 composite was characterized using Fourier Transform Infrared Spectroscopy (FT-IR), X-ray Diffraction (XRD), and Scanning Electron Microscopy/Energy Dispersive X-Ray Spectroscopy (SEM-EDS). Adsorption by batch method with variables including contact time, weight of adsorbent and initial concentration. The FT-IR spectrum of composite showed the - OH, C-H, C-N, N-H, C-O (ether), C-H asymmetric, C-H symmetric, Si-O-Si, Si-OH and Si-O group. XRD spectra of chitosan-SiO2 composites showed a widening peak at 2θ = 19.95 and amorphous. From SEM-EDS spectra show the morphology of chitosan-SiO2 composite was rough, porous and inhomogeneous with constituent elements C, N, O, Na and Si. The chitosan-SiO2 composite has a pHpzc value at pH 7.9. Adsorption data of chitosan-SiO2 composite for adsorption methyl red dyes followed Langmuir isotherm with maximum adsorption capacity 20.876 mg/g. Adsorption methyl red dye onto chitosan-SiO2 composites according to pseudo-second order.
Antioxidant Activities Bioactive Compound of Ethyl Acetate Extracts from rose myrtle Leaves (Rhodomyrtus tomentosa (Ait.) Hassk.)Salni, ; Marisa, Hanifa; Repi, Lili Arista
doi: 10.1088/1757-899X/857/1/012002pmid: N/A
One of the plants traditionally used as medicine is rose myrtle (Rhodomyrtus tomentosa (Ait.) Hassk.). Rose myrtle has the potential as an antioxidant because it has secondary metabolites including flavonoids, phenols, terpenoids, tannins, saponins, and steroids. The purpose of this study was to determine the fraction that has antioxidant activity and obtain antioxidant compounds from ethyl acetate extract of rose myrtle leaves. The research methods included extraction by Soxhletasi, fractionation by vacuum liquid chromatography, purification of compounds with gravity columns, and antioxidant activity test using the DPPH method. The results obtained 32% yield of ethyl acetate extract which was then followed by fractionation. The fractionation results obtained 13 fractions. The fractions that have antioxidant activity namely fractions 5-6, 7, and 8. The fraction was continued to purification and obtained by compound E.1, compound E.2 from the essential oil, and compound E3 allegedly rhodomyrtone. The bioactive compound determined by IC50 value obtained that E1, E2 and E3 that have IC50 value of 218, 207 and 90 μg/mL, respectively. The bioactive compounds of ethyl acetate extract have strong antioxidant activity in E3 and very weak in E1 and E2 compounds.
Tool wear analysis of ceramic cutting tools in the turning of gray cast iron materialsLubis, S; Darmawan, S; Rosehan, ; Winata, W; Zulkarnain, M
doi: 10.1088/1757-899X/857/1/012003pmid: N/A
The development of mechanical and physical properties of metal materials is so fast, that it requires cutting tools that are capable of cutting the metal.Cutting tools must have high temperature resistance, high wear and hardness. Ceramic cutting tools have these properties, so they are suitable for use in cutting hard metals. In the metal machining process, especially machining of cast iron which has high hardness and strength, has a strong reason to use the ceramic cutting tool.This research was conducted to determine wear on ceramic cutting tools when cutting cast iron.The study was carried out experimentally using a Mazak CNC lathe.When the turning process is done, the cutting tool cuts the metal cast iron. Every 10 minutes, the turning process is stopped to observe and measure the wear that occurs on the ceramic cutting tool. Observations and measurements are carried out using a digital microscope.The wear criteria are determined if the tool edge (VB) has been worn at 0.3 mm.The results showed that wear at the cutting speed of 200 m / min at 60 minutes is an adhesion process. BUE (Build Up Edge) wear is a buildup of material layers in the chip area near the cutting tool.
The effect of process water recycle on hydrothermal treatment of yard long bean ( Vigna unguiculata ssp. sesquipedalis) and water spinach (Ipomoea reptans) seedsKurniasari, D; Yuliansyah, A T; Purnomo, C W
doi: 10.1088/1757-899X/857/1/012004pmid: N/A
Hydrothermal treatment is one of thermal biomass conversion method that the solid product can be used as fuel. The main problem of hydrothermal system is the liquid product that usually become waste. The water requirements of hydrothermal treatment need to be assessed to determine commercial feasibility. This research aims to study the influence of reusing liquid product to become process waster in hydrothermal treatment of yard long bean and water spinach seed with temperature variation of 180, 200 and 220 °C, biomass and water ratio of 1:5, and residence time of 40 minutes. Solid product was characterized in terms of mass yield and heating value (HHV). It is found that the solid yield value increased 8% from the first to the sixth process using recycle water. The biggest HHV of solid product was the hydrothermal process with temperature of 220°C using the 5th recycle liquid at 5499 cal/g for water spinach seed and 5466 cal/g for long bean seed.
Development and characterization of porous hydroxyapatite-Alumina composite for engineering applicationArifin, A; Gunawan, ; Priyadi, A; Sanjaya, F A
doi: 10.1088/1757-899X/857/1/012005pmid: N/A
Synthetic hydroxyapatite is a material that has a chemical composition and molecular structure similar to bones and teeth, generally this material is widely used for medical applications including as an implant material. Non-medical applications of porous HA include as catalyst in chemical reaction, packing media for column chromatography, and as probe for gas sensors. The study aims to develop porous material based HA/Al2O3 composites. HA/Al2O3 composites prepared with three variations of latex space holder weight fractions namely 10%, 20%, and 30% and using the unidirectional compaction method to produce composites. Two step holding process sintering process applied on the green body specimens. Firstly, hold for 60 minutes at temperature of 600°C and secondly 3 hours at final temperature of 1200°C with 5°C/min heating rate. The apparent density test was performed based on the Archimedes’ principle. Porosity characteristics of the sample show that density of the composite decreased with increased space holder. Compressive strength results show that the addition of SH weight fraction decreased the compressive strength of porous hydroxyapatite-Al2O3 composites. The morphology observation via SEM showed pore formation due to burning of space holder and interconnecting porous formed.
Failure analysis of AISI 304 stainless steel pipeline transmission a petrochemical plantArifin, A; Gunawan, ; Yani, I
doi: 10.1088/1757-899X/857/1/012006pmid: N/A
This paper presents the failure analysis of AISI304 stainless steel pipeline that was fabricated by welding and used for CO2 transmission in a petrochemical plant. After a years of satisfactory operation, significant cracking was observed adjacent to the weld joints of valve and pipeline. The failure investigation was carried out on welded pipe samples using optical and fractography, micro hardness measurements, XRF and XRD testing. The hardness test results show faults occur in the HAZ region. Fractured surface macrostructure and morphology analysis shows inter-granular brittle fracture mode. The inter-granular fault begins with the presence of very intensive inter-granular corrosion, especially on the outer metal surface and progressively propagates to the inside of the metal. The results of XRD found peak of carbide from the secondary phase of SS 304 austenite steel. The material experienced sensitization that is indicated by the presence of carbides at the grain boundary.
Development of aluminum matrix composite with hybrid reinforcement using stir casting routeGunawan, ; Arifin, A; Reza, M; Wijaya, A N P
doi: 10.1088/1757-899X/857/1/012007pmid: N/A
Aluminum matrix composite (AMCs) has widely utilized in various industries such as automotive, aerospace maritime, electronics components, sports equipment. AMCs is considered as potential materials due to their excellent mechanical and physical properties. The aim of this work is to investigate effect of the addition SiC and fly ash on mechanical properties of AMCs. In this study, AMCs is fabricated using stir casting method with SiC (8 wt%) and Fly ash (0 wt%, 4 wt%, 8 wt% and 12 wt%) as hybrid reinforcement. Aluminum alloy was heated above its melting temperature in the steel crucible and poured into steel mold at 700°C with mixing speed of blade and mixing time are 350 rpm and 400 S, respectively. Mechanical properties of AMCs samples were characterized using tensile test, hardness test and impact test. Mechanical properties test reveals that AMCs with composition 12 wt% fly ash and 8 wt% SiC has maximum value in term of tensile test (15,859 kgf/mm2), impact test (10,22 Joule) and hardness test (57,15 BHN).
Effect of fly ash content in Aluminum matrix composite through stir casting method on mechanical and physical propertiesGunawan, ; Arifin, A; Akbar, M A; Asura, I
doi: 10.1088/1757-899X/857/1/012008pmid: N/A
Metal Matrix Composite (MMC) is a potential innovation material to meet the requirements required in various applications. such as in the aerospace, automotive and mining sectors. Stir casting has been known widely as a methode to produce MMC. In this study, Alumunium alloy and fly ash is utilized as matrix composite and reinforced phasing, respectively. Effect for mechanical and physical properties are investigated for the addition fly ash (4, 8 and 12wt%). Alumunium alloy melt with fly ash is stirred with 350 rpm for 5 minutes and poured into the mold at temperature of 800°C. Hardness, impact and density test are performed to investigate the characterization of specimen. The experimental results show that maximum value is obtained at 8 wt% fly ash with 65.83 HB, 11. 8 Joule, 14.299 Kgf/mm2 and 2.7 g/cm3 for hardness, impack, tensile strenght and density, respectively.