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All Journal Rekayasa Mesin E-Dimas: Jurnal Pengabdian kepada Masyarakat JST ( Jurnal Sains Terapan ) JMM (Jurnal Masyarakat Mandiri) Jurnal Teknik Indonesian Physical Review Specta Journal of Technology Makara Journal of Science Makara Journal of Technology PIKAT

Tajalla, Gusti Umindya Nur

Institut Teknologi Kalimantan

Author-ID : 1384639

Chemical Engineering, Chemistry & Bioengineering Civil Engineering, Building, Construction & Architecture Computer Science & IT Education Electrical & Electronics Engineering Energy Engineering Environmental Science Industrial & Manufacturing Engineering Materials Science & Nanotechnology Mathematics Mechanical Engineering Physics Social Sciences Other

Published : 16 Documents Claim Missing Document

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Characterization of Bark-Midrib Fibers using Chemical Treatment Variations as Reinforcement in Bark-Midrib Fiber Composites Oliever Andrea Parusha; Muhammad Nurhidayatur Rozikin; Andromeda Dwi Laksono; Gusti Umindya Nur Tajalla; Nabilla Amalia Putri; Fitriana Maharani Fatchur Rochim
SPECTA Journal of Technology Vol. 3 No. 2 (2019): SPECTA Journal of Technology
Publisher : LPPM ITK

Bark midrib are not fully utilized. Utilize the characterization of the fiber and process it into polymer composites with natural fiber reinforcement. The study was conducted using a variety of chemical treatments in the form of bark midribs without treatment, delignification treatment that is immersion using NaOH media concentration of 1%, 5%, 10% with 3 hours immersion time and bleaching treatment using H2O2 media 2% concentration with immersion time 30, 60 and 90 minutes. In obtaining suitable properties, tensile tests, impact tests, Scanning Electron Microscopy (SEM) images, and Fourier-Transform Infra-Red (FTIR) tests are performed. Optimal delignification treatment at 5% NaOH concentration with a tensile test value of 25.47 MPa (increasing 76.86%) and an impact test value of 11.95 kJ/m2 (increasing 11.45%). The optimal bleaching treatment at 90 minutes immersion with a tensile test value of 35.09 MPa (increased 36.36%) and impact test value of 13.77 kJ/m2 (increased 15.22%). The results of SEM images show that the bark midrib fiber composite without treatment has a lousy interface, delignification treatment with a reasonable good interface, and bleaching treatment with an excellent interface. FTIR test results showed that the bark midrib fiber composite without treatment had a cellulose component but hemicellulose and lignin levels still dominated. Based on the results of the study, bark midrib fiber with delignification chemical treatment using 5% NaOH for 3 hours followed by bleaching treatment using 2% H2O2 for 90 minutes is the treatment with the best results and then applied to a natural fiber composite product.

Studi Pengaruh Waktu Alkalisasi pada Ekstraksi Selulosa Berbasis Serat Eceng Gondok (Eichhornia crassipes) Ainun Zulfikar; Ni Putu Sriniti Novi Kartika Putri; Gusti Umindya Nur Tajalla
SPECTA Journal of Technology Vol. 4 No. 2 (2020): SPECTA Journal of Technology
Publisher : LPPM ITK

This study uses fiber from water hyacinth as the object of research, which is a plant that contains lignocellulose which consists of cellulose, lignin, and hemicellulose. Cellulose extraction is needed to obtain purer cellulose. The cellulose extraction method used was alkalization, using a 17.5% NaOH solution in a mass: volume ratio of 1: 100 with a variation of alkalization time for 20 minutes, 40 minutes and 60 minutes and the alkalization method uses the reflux heating method. Tests used in this study were include gravimetric methods namely Chesson Datta, Fourier Transform Infrared (FTIR), and Scanning Electron Microscope (SEM). Chesson Datta is used to determine the quantitative lignocellulose content by reducing the initial mass and final mass of the sample from the process. FTIR is used to determine the functional groups that lignocellulose has from each sample. SEM was conducted to determine the morphology of the water hyacinth fibers before and after the alkalization treatment. The results obtained by Chesson Datta, with the most optimal alkalization time were 20 minutes with 53.3% cellulose content, 27.6% hemicellulose, and 0.3% lignin. FTIR shows the functional groups C = O, C = C, and C-H belonging to lignocellulose along with the shifting of the wave number and the change in absorbance in each variable. SEM shows morphological differences in the fibers undergoing the process of alkalization with those without treatment. So that the alkalization affects the morphology of the water hyacinth fiber.

Sifat Mekanik Produk Metalurgi Serbuk dari Proses Ball Milling dengan Bahan Baku Al7075 Terhadap Variasi Temperatur Sinter dan Tekanan Kompaksi Hizkia Alpha Dewanto; Muhammad Zaini Abdi; Achmad Maulana; Ainun Zulfikar; Gusti Umindya Nur Tajalla
SPECTA Journal of Technology Vol. 5 No. 2 (2021): SPECTA Journal of Technology
Publisher : LPPM ITK

Powder metallurgy samples, made from Al7075 powder from ball milling, were produced and investigated. Samples were subjected to two different variables, those were compaction pressure and sintering temperatur. Compaction pressure variables were 250, 300, and 350 MPa with constant sintering temperatur of 505oC. Sintering temperatur variations were 425, 465, and 505oC with constant compaction pressure of 350 MPa. The results of density measurement and hardness test were directly proportional to both of research variables, whereas the porosity was inversely proportional. The properties of sample with variables of 350 MPa compaction pressure and 505oC sintering temperatur were the closest one to conventional Al7075, with density of 2.173 g/cm3, 22.2% porosity, and 12.56 VHN hardness. The properties of conventional Al7075 sample were 2.8 g/cm3 density, 0.26% porosity, and 12.68 VHN hardness. The abrupt increase of hardness between 465oC and 505oC sintering temperatur was similar in pattern of its porosity decrease. This means optimum porosity decrease was started between 465oC and 505oC which affecting hardness increase. Highest hardness of powder metallurgy Al7075, which was 99% of conventional Al7075 and porosity of 22.2%, suggested wide application potential of Al7075 produced by powder metallurgy.

Penambahan Ekstrak Ranting Karamunting (Rhodomyrtus Temenosa) Sebagai Inhibitor Alami Pada Baja AISI 1040 Yanti, Lisda; Darma, Daffa Irsyad; Rifani, Muhammad; Tajalla, Gusti Umindya Nur; Awali, Jatmoko; Mohd, Yusairie; Triana, Yunita
SPECTA Journal of Technology Vol. 7 No. 2 (2023): SPECTA Journal of Technology
Publisher : LPPM ITK

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.35718/specta.v7i2.925

In this study, Karamunting twig extract (Rhodomystus tementosa) was used as a natural inhibitor on AISI 1040 steel. Based on the results of functional group analysis, it was confirmed that the compounds found in Karamunting twig extract are tannins and flavonoids. Electrochemical analysis using the potentiodynamic method showed the lowest corrosion rate at 300 ppm inhibitor concentration, with a corrosion rate of 2.881 mm/yr with an inhibition efficiency of 76.732%. Furthermore, the EIS test showed the highest inhibition efficiency at a concentration of 300 ppm, with a value of 66.720%.

Co-Authors Achmad Maulana Ade Wahyu Yusariarta Putra Parmita Ade Wahyu Yusariarta Putra Parmita Afifah, Vita Nur Ainun Zulfikar Akbar , Aulia Arif Akbar, Aulia Arif Andriansyah, Prisky Anggeswari, Inggrid Dya Anggraini, Elistria Ariani, Ismi Khairunnissa Bimo Surya Lesmana Budi Prayitno Budiarti, Dini Tri Darma, Daffa Irsyad Destiny, Keysi Devain Dewanto, Hizkia Alpha Dharmayanti, Amilita Medisa Rizky Fitriana Maharani Fatchur Rochim Hizkia Alpha Dewanto Hizkia Alpha Dewanto Idhil Ismail, Andi Indrawati, Dini Jatmoko Awali Kartika, Siska Ayu Laksono, Andromeda Dwi Leoriza, Meutya Dwi LIA AMALIA Mahera, Adinda Kholif Mohd, Yusairie Muhammad Nurhidayatur Rozikin Muhammad Rifani, Muhammad Muhammad Sofwan Muhammad Yazid Abyan Rahim Muhammad Zaini Abdi Musyarofah Musyarofah, Musyarofah Muthia Putri Darsini Lubis Nabilla Amalia Putri Nafisah, Azmia Rizka Ni Putu Sriniti Novi Kartika Putri Norhidayah, Siti Oliever Andrea Parusha Paramita, Fika Parmita, Ade Yusariarta Putra Pratama, Winardi Dian Wahyu Putra, Ade Wahyu Yusariarta Rifqi Aulia Tanjung Riyadi, Ilham Tri Riza Hudayarizka Sabrina Humaira Sasria, Nia Sulaksono, Rachmad Prabowo Tajalla, Nur Vadila, Mei Lisa Nur Wisaka, Adi Yanti, Lisda Yosua Anjupaian Situmeang Yunita Triana, Yunita Yurischa Deify Utami Yusariarta Putra Parmita, Ade Wahyu

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