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All Journal Jurnal Sains dan Seni ITS Journal of Natural Sciences and Mathematics Research Jurnal Rekayasa Mesin Manutech : Jurnal Teknologi Manufaktur Piston: Journal of Technical Engineering International Journal of Applied Technology Research Aptekmas : Jurnal Pengabdian Kepada Masyarakat Industrial Research Workshop and National Seminar
Devi Eka Septiyani Arifin
Jurusan Teknik Mesin, Politeknik Negeri Bandung
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CHARACTERIZATION OF PROPERTIES OF PVDF/POLY(DIMETHYLSILOXANE) COMPOSITES SEPARATOR WITH BLENDING MEMBRANE METHOD Arifin, Devi Eka Septiyani
Journal Of Natural Sciences And Mathematics Research Vol 3, No 2 (2017): Volume 3, Nomor 2, 2017
Publisher : Faculty of Science and Technology, State Islamic University Walisongo Central Java

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.21580/jnsmr.2017.3.2.1780

Abstract

The aims of this research to make poly(vinylidene fluoride) (PVDF) and poly(dimetilsiloksan) (PDMS) composites separator with blending membrane method. Synthesized of  PVDF/PDMS composites separator used various ratio were 10/0, 9/1, 8/2, and 7/3. The purpose of increasing concentration of PDMS/PVDF to improve the performance of the composites separator which includes a dimensions of porosity, a pore density, and a electrical conductivity. Based on crystallographic analysis using XRD, the increasing concentration number of PDMS to make compositess was influence decreasing of crystallinity until 29.26% in a ratio 7/3.The analysing of FTIR have sound the wavenumber of each phase can distinguish, which this material includes in the criteria of the composites. The result using XRD and FTIR to material PVDF/PDMS composites in all of the ratio constituens have shown the identification of the structure α-phase of PVDF. The increase of concentration number PDMS influenced decreasing of pore dimension and increasing of pore density with the small of pore dimension 1.71 µm and pore density 4.07x1011 count/m2 inthe ratio 7/3. In a ratio 7/3, the value of the electrical conductivity was 3.45x10-4S/cm and the resistance increased up to 80%.
Karakterisasi Sifat Separator Komposit PVDF/poli(dimetilsiloksan) Dengan Metode Pencampuran Membran (Blending Membrane) Devi Eka Septiyani Arifin; Mochamad Zainuri
Jurnal Sains dan Seni ITS Vol 3, No 2 (2014)
Publisher : Lembaga Penelitian dan Pengabdian Kepada Masyarakat (LPPM), ITS

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (537.295 KB) | DOI: 10.12962/j23373520.v3i2.6693

Abstract

Penelitian ini bertujuan membuat bahan separator komposit polivinilidene flouride (PVDF) dan poli(dimetilsiloksan) (PDMS) dengan metode pencampuran membran (blending membrane). Perbandingan variasi komposisi PVDF/PDMS yaitu 10:0, 9:1, 8:2, dan 7:3. Tujuan dari peningkatan fraksi konsentrasi dari PDMS terhadap PVDF untuk meningkatkan performa separator komposit yang meliputi dimensi porositas, kerapatan pori, dan konduktivitas listriknya. Berdasarkan analisa kristalografi dengan menggunkan XRD, peningkatan konsentrasi PDMS mengakibatkan menurunnya derajat kristalinitas, dimana derajat kristalinitas tertinggi dicapai pada perbandingan 10:0 sebesar 63,84% dan terendah pada perbandingan 7:3 sebesar 29,26%, dan berdasarkan interpretasi data FTIR material tersebut termasuk kedalam kriteria bahan komposit karena kedua fasa dari bahan tersebut masih bisa dibedakan bilangan gelombang vibrasi molekuler masing-masing bahan penyusunnya. Hasil analisa XRD fasa kristalin PVDF termasuk kriteria jenis fasa α-PVDF. Semakin tinggi konsentrasi PDMS mengakibatkan penurunan dimensi porositas dan meningkatkan kerapatan porositasnya, dengan dimensi pori terkecil sebesar 1,71 µm dan kerapatan pori sebesar 4,07x1011 count/m2 pada perbandingan 7:3. Pada perbandingan komposisi 7:3 mempunyai nilai konduktivitas listrik sebesar 3,45 x 10-4 S/cm dan resistansi meningkat hingga 80% pada penambahan PDMS. Berdasarkan kriteria diatas, material ini dapat dikategorikan sebagai bahan separator pada baterai ion lithium.
CHARACTERIZATION OF PROPERTIES OF PVDF/POLY(DIMETHYLSILOXANE) COMPOSITES SEPARATOR WITH BLENDING MEMBRANE METHOD Devi Eka Septiyani Arifin
Journal of Natural Sciences and Mathematics Research Vol 3, No 2 (2017): December
Publisher : Faculty of Science and Technology, Universitas Islam Negeri Walisongo Semarang

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (1026.176 KB) | DOI: 10.21580/jnsmr.2017.3.2.1780

Abstract

The aims of this research to make poly(vinylidene fluoride) (PVDF) and poly(dimetilsiloksan) (PDMS) composites separator with blending membrane method. Synthesized of  PVDF/PDMS composites separator used various ratio were 10/0, 9/1, 8/2, and 7/3. The purpose of increasing concentration of PDMS/PVDF to improve the performance of the composites separator which includes a dimensions of porosity, a pore density, and a electrical conductivity. Based on crystallographic analysis using XRD, the increasing concentration number of PDMS to make compositess was influence decreasing of crystallinity until 29.26% in a ratio 7/3.The analysing of FTIR have sound the wavenumber of each phase can distinguish, which this material includes in the criteria of the composites. The result using XRD and FTIR to material PVDF/PDMS composites in all of the ratio constituens have shown the identification of the structure α-phase of PVDF. The increase of concentration number PDMS influenced decreasing of pore dimension and increasing of pore density with the small of pore dimension 1.71 µm and pore density 4.07x1011 count/m2 inthe ratio 7/3. In a ratio 7/3, the value of the electrical conductivity was 3.45x10-4S/cm and the resistance increased up to 80%.
Application of Organic Inhibitors to the Corrosion of Materials AISI 1070 Steel Destri Muliastri; Devi Eka Septiyani; Naufal Afif; Vania Tingting Sirenden; Januar Nur Rohmah Suprihartini
Jurnal Internasional Penelitian Teknologi Terapan Vol 2 No 1 (2021): April 2021
Publisher : Bandung State Polytechnic (Politeknik Negeri Bandung)

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.35313/ijatr.v2i1.39

Abstract

AISI 1070 steel is a material that has corrosion when it reacts with the environment. One way to inhibit the corrosion rate is by using organic inhibitors. The organic inhibitors used mango leaves and mango rinds with variations in the concentration of organic inhibitors of 0%, 6%, and 8%, respectively. This study aimed to determine the effectiveness of mango leaf extract and mango rinds as an inhibitor against the corrosion rate of AISI 1070 Steel. The extraction was carried out using the Maceration Method. Fourier Transform Infrared (FTIR), Potenzyodinamic, and Weight Loss tests were carried out in this study. FTIR results show that both mango rinds and mango leaf have ingredients that were able to inhibit the corrosion rate, such as flavonoid functional groups including C – H, C = O, and C – O. Using the weight-loss method, the best corrosion rate was found in the mango rinds extract with a concentration of 8 mL, which was 31.784 mm/year with an inhibition efficiency of 92%. The highest corrosion rate was in 2M H2SO4 solution using potentiodynamic, without a mixture of inhibitors, that is 0.15589478 mm/year.
Green Corrosion Inhibitors to Head Off the Corrosion Rate of ST 37 Steels Devi Eka Septiyani Arifin; Destri Muliastri; Rudi Rudiana; Fitri Nur Indah Sari
Jurnal Internasional Penelitian Teknologi Terapan Vol 2 No 1 (2021): April 2021
Publisher : Bandung State Polytechnic (Politeknik Negeri Bandung)

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.35313/ijatr.v2i1.40

Abstract

The corrosions process is a natural process and cannot be hindered, but it can be protected by adding a green inhibitor. Green corrosion inhibitors are a new alternative solution for corrosion protection because they are low-cost, biodegradable, and eco-friendly inhibitors. This research was used papaya leaves dan guava leaves extract as organic inhibitor solution by Maceration Method. The concentration of these green inhibitors is 0 mL, 1 mL, 2.5 mL, 3 mL, and 3.5 mL. The type of testing method used in this research is FTIR, PDP, and weight loss. The results show that there is Tanin function groups in papaya leaves and guava leaves extract. The potentiodynamic polarization shows the value of corrosion rate without inhibitor is 0,418 mm/year. In contrast, the corrosion rate was decreased with improving the green inhibitor as many 3.5 mL. The corrosion rate was decreased until 0,00055 mm/year, and the value of efficiency is 99,868%.
Pemanfaatan Ekstrak Abu Sekam Padi sebagai Green Inhibitor pada Baja Karbon dalam Media Air Laut Buatan DEVI EKA SEPTIYANI ARIFIN; Destri Muliastri
Manutech : Jurnal Teknologi Manufaktur Vol. 14 No. 01 (2022): Manutech: Jurnal Teknologi Manufaktur
Publisher : Politeknik Manufaktur Negeri Bangka Belitung

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.33504/manutech.v14i01.205

Abstract

Rice husk ash is a high resources of silica about 20%. Husk ash contains silica as much as 87% - 97%. One of the uses of silica is to control the occurrence of corrosion by adding a green inhibitor from rice husk ash extract. Furthermore, green inhibitors were tested for their content by FTIR. In the next step, a green inhibitor was added to 3.5% NaCl corrosive media with variations of green inhibitor 0%, 1%, 3%, 5%, and 7% and the length of immersion of  ST41 steel plate for 7 days for weight loss testing. The next process is the corrosion rate test, weight loss test and morphology test to see the depth of corrosion that occurs on the plate. The results of the FTIR test showed the presence of silica contained in the green inhibitor of rice husk ash extract. The addition of this green inhibitor causes a decrease in the corrosion rate of ST 41 Steel in a 3.5% NaCl solution. In the Potentiodynamic Polarization (PDP) test, the corrosion rate value with the addition of 5% green inhibitor’s decreased from 0,01482 mpy to 0.00319 mpy  with an inhibition efficiency value of 78,446%. Changes in the corrosion rate on the morphology of steel that had been soaked for 7 days were characterized by optical microscopy, it was seen that corrosion growth decreased with increasing concentration of green inhibitor.
Perancangan Mesin Pembuat Pelet Apung Berbahan Maggot Berkapasitas 20 Kg/Jam dengan Metode TRIZ Adnan Rakhmadi Ramadhan; Devi Eka Septiyani; Heri Widiantoro
Prosiding Industrial Research Workshop and National Seminar Vol 12 (2021): Prosiding 12th Industrial Research Workshop and National Seminar (IRWNS)
Publisher : Politeknik Negeri Bandung

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (553.732 KB)

Abstract

Perancangan Mesin Pembuat Pelet Apung Berbahan Maggot Berkapasitas 20 Kg/Jam dengan Metode TRIZ
Perancangan Mesin Daur Ulang Limbah Masker Tiga Lapis dengan Kapasitas 2,5 kg/Proses Syafiq Ade Priyatama; Undiana Bambang; Devi Eka Septiyani Arifin
Prosiding Industrial Research Workshop and National Seminar Vol 12 (2021): Prosiding 12th Industrial Research Workshop and National Seminar (IRWNS)
Publisher : Politeknik Negeri Bandung

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (810.803 KB)

Abstract

Perancangan Mesin Daur Ulang Limbah Masker Tiga Lapis dengan Kapasitas 2,5 kg/Proses
Perancangan Alat Pengolah Sampah Expanded Polystyrene Foam (EPS) Portabel untuk Mengatasi Masalah Sampah di Sektor Rumah Tangga Aqil Murtadho; Budi Triyono; Devi Eka Septiyani Arifin
Prosiding Industrial Research Workshop and National Seminar Vol 12 (2021): Prosiding 12th Industrial Research Workshop and National Seminar (IRWNS)
Publisher : Politeknik Negeri Bandung

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (632.159 KB)

Abstract

Perancangan Alat Pengolah Sampah Expanded Polystyrene Foam (EPS) Portabel untuk Mengatasi Masalah Sampah di Sektor Rumah Tangga
Rekayasa Ulang Mesin Sangrai Kopi Kapasitas 10 Kg Menggunakan Mekanisme Konveksi Prasetyo Prasetyo; Tantan Sholahuddin; Devi Eka Septiani; Ilham Azmy; Musyafak Musyafak
Piston: Journal of Technical Engineering Vol 6, No 2 (2022)
Publisher : Prodi Teknik Mesin

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.32493/pjte.v6i2.24976

Abstract

Proses sangrai kopi adalah proses yang sangat penting sebelum proses grinder. Proses sangrai menciptakan rasa, aroma, kadar air, kadar kafein dan keasaman dalam biji kopi. Petani kopi Lembaga Masyarakat Desa Kopi (LMDH) menggunakan mesin sangrai kopi tipe rotari dalam proses penyangraian kopi secara konduksi. Namun, mesin sangrai yang digunakan memiliki beberapa kekurangan yang berdampak pada kualitas hasil sangrai yang tidak merata (warna medium /coklat tua 10% dan dark 90%). Sehingga dilakukan proses rekayasa ulang dalam rangka menghasilkan hasil sangrai yang inginkan. Rekaya ulang ini akan dirancang mesin sangrai dengan menggunakan metode pemanasan konveksi. Berdasarkan buku Pahl & Beitz proses perancangan terbagi dalam tiga tahapan yaitu: kajian produk eksisting, langkah perancangan konsep alat dan tahap embodiment design. Langkah kajian produk eksisting berupa identifikasi masalah terhadap mesin yang sudah ada di lapangan. Tahap perencanaan konsep, brainstorming untuk mendapatkan konsep rancangan yang optimal. Tahap perencanaan detail, perhitungan bagian kritis dalam desain. Luaran dari penelitian ini berupa konsep rancangan rekayasa ulang, implementasi hasil rancangan serta pengujian lapangan terhadap mesin sangrai kopi. Rancangan mesin sangrai menggunakan 1 buah silinder yang dipanaskan secara konduksi serta 1 buah silinder berlubang tempat penyimpanan biji kopi dengan jarak 5 mm antar kedua silinder. Kopi diputar di dalam silinder menggunakan tabung berlubang yang diputar sehingga kopi dapat tersangrai sempurna. Konsep rancangan terpilih menggunakan motor dengan daya 0.3 Kw, gearbox dengan ratio 1:20, luaran putaran 70 rpm, diameter poros 30 mm dan bantalan yang kuat bertahan sampai 5 tahun. Hasil pengujian menunjukan sangrai biji kopi dengan rasio warna medium (coklat tua) sebesar 70% medium (coklat tua) dan 30% light (coklat muda), dengan temperatur ruang 200 0C serta waktu pemanasan sebesar 21 menit untuk berat kopi seberat 10kg. Komsumsi energi yang digunakan selama proses penyangraian sebesar 0,105 kWh.
Co-Authors Adnan Rakhmadi Ramadhan Aqil Murtadho Budi Triyono Budi Triyono Destri Muliastri Destri Muliastri Fitri Nur Indah Sari Heri Widiantoro Ilham Azmy Januar Nur Rohmah Suprihartini Lesmana, Prayoga Musyafak Musyafak Naufal Afif Prasetyo Prasetyo Rudi Rudiana Rudy Yuni W Slamet Sutjipto Syafiq Ade Priyatama Tantan Sholahuddin Undiana Bambang Vania Tingting Sirenden Zainuri (DOI: 10.12962/j24604682.v12i2.1331), Mochamad