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ANALYZING THE PROPERTIES OF A COMPOSITE OF PCL-GRAPHITE BY THE INJECTION MOLDING Setyarini, Putu Hadi; Fariqi, Ikhwan Hafiz; Sonief, Achmad As’ad
International Journal of Mechanical Engineering Technologies and Applications Vol. 5 No. 2 (2024)
Publisher : Mechanical Engineering Department, Engineering Faculty, Brawijaya University

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.21776/MECHTA.2024.005.02.1

Coral reefs are vulnerable to several natural phenomena such as ocean warming, acidification, coral diseases, and plastic pollution. In order to tackle these problems, scientists are now working on the development of biocomposites utilizing biodegradable polymers such as polycaprolactone (PCL). Graphite can be used in conjunction with PCL to enhance its characteristics. The work is centered around conducting water absorption experiments on a composite material consisting of PCL and graphite. The investigation employs PCL granular and graphite powdered materials. The materials undergo heating, crushing, and weighing processes to ascertain weight ratios. Next, the mixture is shaped into specimens. The product's shape and distribution of chemical constituents are analyzed using water absorption, hydrophobicity, FTIR, and SEM testing. The findings indicate that the water absorption diminishes as the concentration of graphite powder increases. An alloy containing 10% graphite had the highest water absorption rate. The hydrophobicity test assesses the ability of a specimen's surface to repel water by introducing NaCl droplets and observing droplet production. The contact angle value exhibits a direct correlation with the increase in graphite content. The FTIR study indicates that there are no changes in the functional groups, resulting in a limited connection between the PCL matrix and the graphite filler. The temperature during the injection molding process affects the microstructure of the polymer. Lower temperatures lead to reduced crystallization, whereas higher temperatures result in denser molecular groupings. Graphite is a highly suitable choice for use as a filler in a PCL matrix because of its layered structure, large surface area, and excellent capacity to effectively fill voids within the matrix.

MODIFICATION OF WOVEN DENDROCALAMUS ASPER IN COMPOSITE APPLICATIONS Raharjo, Rudianto; Darmadi, Djarot Bangun; Gapsari, Femiana; Setyarini, Putu Hadi; Alamsyah, Fikrul Akbar
International Journal of Mechanical Engineering Technologies and Applications Vol. 5 No. 2 (2024)
Publisher : Mechanical Engineering Department, Engineering Faculty, Brawijaya University

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.21776/MECHTA.2024.005.02.6

The aim of this study is to examine the influence of immersing Petung Bamboo in a NaOH solution on the tensile strength (TS) of composites containing an epoxy matrix. Petung Bamboo Webbing was given 0%, 3%, 6% and 9%, soaking treatment. The Composite utilised in this investigation was fabricated by the Vacuum Assisted Resin Infusion technique. Tensile testing of composites is conducted according to the ASTM D638-1 standard. The findings indicated a positive correlation between the concentration of NaOH immersion and the adhesion between the woven surface of Petung Bamboo and the matrix. Consequently, the TS of the Composite was enhanced. However, increasing the concentrations beyond a certain point leads to more degradation of the lignin and cellulose in the fibers, resulting in a loss in the strength of the composite. The Petung Bamboo woven reinforced Composite achieved the highest TS of 136.06 MPa after being treated with a 6% NaOH immersion. This was followed by a 3% NaOH immersion treatment resulting in a TS of 106.04 MPa. Without any NaOH immersion treatment, the composite had a TS of 97.31 MPa. The lowest TS of the composite was observed after a 9% NaOH immersion treatment, measuring 90.79 MPa. The Petung Bamboo wicker-reinforced composite with NaOH immersion treatment showed higher fiber pullout and fiber-matrix debonding failures, while higher NaOH treatment concentration reduced these failures.

The effect of different levels of cleanness of the pre-coat surface on adhesion and corrosion performance of A36 steel with epoxy coating Widodo, Teguh Dwi; Setyarini, Putu Hadi; Sugiarto, Sugiarto; Raharjo, Rudianto; Bintarto, Redi; Darmadi, Djarot Bangun; Sagita, Sagita
SINERGI Vol 30, No 1 (2026)
Publisher : Universitas Mercu Buana

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.22441/sinergi.2026.1.010

Adhesion and corrosion protection are the main properties of epoxy coatings, especially when applied to materials exposed to harsh environments, such as chloride-containing water. However, the adhesion and corrosion protection of coatings are affected by surface preparation, especially the cleanliness of the substrate surface prior to coating application. Choosing the proper surface preparation can optimize the coating's capabilities. This research aims to evaluate the Effect of blasting process cleanliness on coating performance on the steel surface. The novel approach is to correlate NACE surface cleanliness standards with coating performance. In this study, A36 steel is used. The cleaning procedure uses an air-blasting process with an 8-bar nozzle pressure and at least 5 minutes of spraying time to meet the desired National Association of Corrosion Engineers (NACE) standard. The abrasive utilizing garnet with a mesh of 30-40. Meanwhile, coating is performed at room temperature using the airless spray method with a 90° angle, a distance of 25 cm from the substrate and the nozzle, and a nozzle speed of 300 mm/s. The gap in the coating process between the first and second layers is 24 hours. The results showed that surface preparation influenced the coating's pullout strength and corrosion performance. The pullout strength test demonstrated that NACE 2 provided the highest pullout strength. Likewise, corrosion rate testing showed that surface preparation affects the corrosion rate, with NACE 1 providing the lowest corrosion rate (the best corrosion protection).

Effect of High Concentration Alkali Treatment on the Mechanical and Structural Properties of Doyo Fibers (Curculigo Latifolia) Setiawan, Ferry Bayu; Setyarini, Putu Hadi; Irawan, Yudy Surya
Jurnal Rekayasa Mesin Vol. 17 No. 1 (2026)
Publisher : Jurusan Teknik Mesin, Fakultas Teknik, Universitas Brawijaya

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.21776/jrm.v17i1.2321

The growing demand for sustainable materials has increased interest in natural fibers as eco-friendly reinforcements. Doyo fiber (Curculigo latifolia) from East Kalimantan remains insufficiently characterized despite its ecological potential. This study investigates the effect of alkali treatment concentration and immersion time on the mechanical and structural properties of doyo fibers. Fibers were treated using NaOH solutions (5–10%) and analyzed through tensile testing, Fourier transform infrared spectroscopy (FTIR), and field emission scanning electron microscopy (FESEM). Untreated fibers exhibited the highest tensile strength (176.83 MPa), while moderate treatment (5% NaOH for 90 min) preserved comparable strength (171.52 MPa) with improved surface activation. Aggressive treatment (10% NaOH) reduced tensile strength below 110 MPa due to cellulose degradation. These results demonstrate that alkali treatment requires careful optimization to balance performance enhancement and structural integrity.

Peningkatan Kualitas Air di SDI As Salam Malang: Sistem Filtrasi Berlapis untuk Mengatasi Kontaminasi Besi Tinggi Putu Hadi Setyarini; Sisca Fajriani; Evi Nur Cahya; Mochammad Roviq; Nuretha Hevy Purwaningtyas
Jurnal Surya Masyarakat Vol 8, No 1 (2025): November 2025
Publisher : Universitas Muhammadiyah Semarang

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.26714/jsm.8.1.2025.99-109

The quality of water used in daily activities plays a crucial role in supporting health, comfort, and safety, particularly in educational environments. At SDI As Salam, Malang City, groundwater utilized by the school contained very high concentrations of iron (Fe), resulting in a a yellowish color, unpleasant odor, and suspended particles that reduce clarity due to oxidation of dissolved iron into brown or yellow solids, thereby significantly lowering water quality and posing health risks for students who consume it daily. To address this issue, the Doktor Mengabdi Team from Universitas Brawijaya implemented a multi-layer filtration system using affordable local materials such as silica sand, activated carbon, zeolite, and manganese greensand, designed to remove contaminants including dissolved iron, heavy metals, and harmful chemicals. The results showed that iron concentration decreased by more than 80%, turbidity reduced from 30 NTU to 2 NTU, and pH increased from 5.8 to 6.8, while microbiological testing confirmed a significant reduction in E. coli and total coliform, indicating that the filtered water is safe for use. Thus, the application of this multi-layer filtration system not only improves water quality but also creates a healthier environment that supports more effective learning activities.

Strategi Peningkatan Kemandirian Energi melalui Pemanfaatan Panel Surya untuk Hidroponik dan Akuaponik di SDI As Salam dan SMPIT As Salam Kota Malang Putu Hadi Setyarini; Sisca Fajriani; Tri Nurwati; Mochammad Roviq; Dian Inayati
Jurnal Surya Masyarakat Vol 7, No 1 (2024): November 2024
Publisher : Universitas Muhammadiyah Semarang

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.26714/jsm.7.1.2024.159-167

The community service activity at SDI As Salam and SMPIT As Salam aimed to enhance energy independence through the integration of solar panels in hydroponic and aquaponic systems. Solar panels were utilized as an alternative energy source to reduce dependency on PLN electricity, which posed major challenges for water pump operations in hydroponic and aquaponic farming systems. The Participatory Rural Appraisal approach was implemented through technical training, solar panel installation workshops, and farming assistance. The results demonstrated that using solar panels reduced electricity costs, supported students' learning about renewable energy, and improved the sustainability of urban farming in schools. The integration of solar panels with hydroponic and aquaponic systems provided a practical and eco-friendly solution to energy challenges for farming on limited land.

Strategi Peningkatan Kemandirian Energi melalui Pemanfaatan Panel Surya untuk Hidroponik dan Akuaponik di SDI As Salam dan SMPIT As Salam Kota Malang Putu Hadi Setyarini; Sisca Fajriani; Tri Nurwati; Mochammad Roviq; Dian Inayati
Jurnal Surya Masyarakat Vol 7, No 1 (2024): November 2024
Publisher : Universitas Muhammadiyah Semarang

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.26714/jsm.7.1.2024.159-167

The community service activity at SDI As Salam and SMPIT As Salam aimed to enhance energy independence through the integration of solar panels in hydroponic and aquaponic systems. Solar panels were utilized as an alternative energy source to reduce dependency on PLN electricity, which posed major challenges for water pump operations in hydroponic and aquaponic farming systems. The Participatory Rural Appraisal approach was implemented through technical training, solar panel installation workshops, and farming assistance. The results demonstrated that using solar panels reduced electricity costs, supported students' learning about renewable energy, and improved the sustainability of urban farming in schools. The integration of solar panels with hydroponic and aquaponic systems provided a practical and eco-friendly solution to energy challenges for farming on limited land.

Comparative Efficacy of Two Bamboo-Derived Activated Carbons for Hospital Wastewater Remediation Putu Hadi Setyarini; Hanum Surya Pembayun; Dwi Hadi Sulistyarini; Nuretha Hevy Purwaningtyas; Francisca Gayuh Utami Dewi
Advance Sustainable Science Engineering and Technology Vol. 7 No. 3 (2025): May - July
Publisher : Science and Technology Research Centre Universitas PGRI Semarang

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.26877/asset.v7i3.1895

Liquid medical waste containing pathogens and hazardous chemicals can pollute the environment and endanger human health. The increasing volume of waste during the COVID-19 pandemic adds urgency to find effective and sustainable treatment methods. However, environmentally friendly and efficient solutions are still limited. This study aims to explore the utilization of activated carbon from two local bamboo species, Gigantochloa apus (GA) and Bambusa vulgaris (BV) as alternative adsorbents in the treatment of liquid medical waste. Two-year-old bamboo was traditionally carbonized and activated using 0.3 M sodium chloride solution. The 50 mesh charcoal powder was tested using BET surface area analysis with QUADRASORB evo™ instrument, morphology using FESEM (FEI Quanta 650), and pollutant reduction efficiency through pH, TDS (HAIK EZ 9909), COD (HACH DBR 200 closed reflux method), and BOD (Winkler method with BOD 6 VELP system) measurements. The results showed that GA activated carbon exhibited a much higher adsorption capacity due to its larger BET surface area compared to BV. In addition, pH and Total Dissolved Solids (TDS) analysis showed that wastewater treated with GA activated carbon exhibited a greater reduction in TDS levels. The study also evaluated the reduction of Chemical Oxygen Demand (COD) and Biological Oxygen Demand (BOD), which confirmed that GA provided higher pollutant removal efficiency than BV. These findings underscore the potential of GA and BV as effective adsorbents for medical wastewater treatment, offering a sustainable solution to improve water quality and reduce environmental impacts associated with liquid medical waste.

Peningkatan Kualitas Air di SDI As Salam Malang: Sistem Filtrasi Berlapis untuk Mengatasi Kontaminasi Besi Tinggi Putu Hadi Setyarini; Sisca Fajriani; Evi Nur Cahya; Mochammad Roviq; Nuretha Hevy Purwaningtyas
Jurnal Surya Masyarakat Vol 8, No 1 (2025): November 2025
Publisher : Universitas Muhammadiyah Semarang

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.26714/jsm.8.1.2025.99-109

The quality of water used in daily activities plays a crucial role in supporting health, comfort, and safety, particularly in educational environments. At SDI As Salam, Malang City, groundwater utilized by the school contained very high concentrations of iron (Fe), resulting in a a yellowish color, unpleasant odor, and suspended particles that reduce clarity due to oxidation of dissolved iron into brown or yellow solids, thereby significantly lowering water quality and posing health risks for students who consume it daily. To address this issue, the Doktor Mengabdi Team from Universitas Brawijaya implemented a multi-layer filtration system using affordable local materials such as silica sand, activated carbon, zeolite, and manganese greensand, designed to remove contaminants including dissolved iron, heavy metals, and harmful chemicals. The results showed that iron concentration decreased by more than 80%, turbidity reduced from 30 NTU to 2 NTU, and pH increased from 5.8 to 6.8, while microbiological testing confirmed a significant reduction in E. coli and total coliform, indicating that the filtered water is safe for use. Thus, the application of this multi-layer filtration system not only improves water quality but also creates a healthier environment that supports more effective learning activities.

Design of Organic Material Chopping Machine As A Support for Waste Processing Activities at TPST BMR Mandiri Anam, Khairul; Gapsari, Femiana; Setyarini, Putu Hadi
TEKAD : Teknik Mengabdi Vol. 4 No. 2 (2025)
Publisher : Fakultas Teknik, Universitas Brawijaya

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.21776/ub.tekad.2025.04.2.5

TPST BMR “MANDIRI” is a centralized waste disposal site in Bumi Mondoroko Raya Housing. Until now, this TPST only functions as a temporary shelter. The waste that enters this TPST will be sorted into plastic waste and organic waste. Organic waste will be put into a container that will be picked up regularly by the environmental service. One of the main problems of this TPST is the volume of the container. The longer the organic waste that enters the more so that the available containers cannot accommodate it. So a way is needed to overcome this problem. The solution offered is the manufacture of an organic waste chopping machine, especially vegetables. The hope is that with this machine, the volume of containers for organic waste can be reduced and the chopped vegetables can be used for the fertilizer making process. Where the sale of this organic fertilizer can increase the income of this TPST. The output target of this community service activity is the making of a organic material chopping machine with a certain capacity.

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