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Nurkholis Hamidi
Departement Of Mechanical Engineering Brawijaya University, Malang
Aerospace Engineering Agriculture, Biological Sciences & Forestry Automotive Engineering Biochemistry, Genetics & Molecular Biology Chemical Engineering, Chemistry & Bioengineering Chemistry Computer Science & IT Control & Systems Engineering Decision Sciences, Operations Research & Management Earth & Planetary Sciences Economics, Econometrics & Finance Education Electrical & Electronics Engineering Energy Engineering Environmental Science Health Professions Industrial & Manufacturing Engineering Languange, Linguistic, Communication & Media Law, Crime, Criminology & Criminal Justice Materials Science & Nanotechnology Mechanical Engineering Neuroscience Social Sciences Other

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MORPHOLOGY, STRUCTURE AND MECHANICAL PROPERTIES OF NATURAL CELLULOSE FIBER FROM OIL PALM FROND FIBER (ELAEIS GUINEENSIS JACQ) Sari, Martina Puspita; Purnowidodo, Anindito; Hamidi, Nurkholis
Jurnal Rekayasa Mesin Vol. 16 No. 2 (2025)
Publisher : Jurusan Teknik Mesin, Fakultas Teknik, Universitas Brawijaya

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.21776/jrm.v16i2.1590

Abstract

Natural fiber is one of the innovations in the development of renewable materials from composites which are considered more environmentally friendly. One of the advantages is that it is biodegradable which are able to decompose in nature and does not leave residues that are harmful to the environment until now it has been developed in combination with various types of polymer matrices so that it can produce composites that have good strength. In this study, composites made from palm frond fiber (Elaeis guineensis Jacq) were characterized by a two-step treatment, namely alkalization using sodium hydroxide (NaOH) and the addition of a bleaching process using hydrogen peroxide (H2O2). single fiber and Weibull distribution methods, chemical properties testing including chemical composition of fiber content, FTIR, and physical property testing including diameter measurement and SEM observations. Thus, the optimal concentration of alkali and bleaching was produced in the two-step process between 5% NaOH concentration and H2O2 in terms of bonding characteristics, this was mainly due to the reduction of the amorphous part of the fiber. There was a color change after the OPFF was treated with NaOH and H2O2 where the color of the OPFF became brighter. The heat resistance value is inversely proportional to the thickness value after alkaline treatment. heat resistance increased while the diameter of the OPFF decreased with increasing concentration of NaOH and the addition of the second treatment H2O2. The best crystallinity index was obtained at 10% NaOH variation and the best cellulose content was obtained at 5% NaOH variation. Likewise, the tensile strength of TF without treatment experienced a significant increase (76%) with 5% NaOH - H2O2 treatment. The results of the FTIR (Fourier-transform Infrared Spectroscopy) test confirmed that the alkaline treatment and bleaching removed the hemicellulose content, impurities, and excessive water absorption. The surface of the treated OPFF becomes rougher. The etched surface shows interlocking with the matrix as shown in the SEM images. The effect of NaOH and H2O2 treatment on OPFF shows the potential of OPFF as a reinforcement for matrix polymer composites to reduce the use of synthetic fibers.
THE EFFECT OF AIR FLOW RATE ON THE CHARACTERISTICS OF PULVERIZED CATALYTIC COMBUSTION OF RICE HUSK WASTE BIOMASS Hamidi, Nurkholis; Yuliati, Lilis; Purnami; Maulana , Syahrizal
Jurnal Rekayasa Mesin Vol. 16 No. 2 (2025)
Publisher : Jurusan Teknik Mesin, Fakultas Teknik, Universitas Brawijaya

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.21776/jrm.v16i2.1856

Abstract

The purpose of this study was to determine the effect of airflow rate on the characteristics of catalytic combustion of pulverized rice husk biomass. Natural zeolite was used as the catalyst in this study. The combustion characteristics included the value of Initiation Temperature of Volatile Matter (ITVM), Initiation Temperature of Fixed Carbon (ITFC), peak of weight loss rate temperature (PT), Burning out Temperature (BT), mass reduction graph (TGA), mass reduction rate (DTG), heating value, and activation energy were measured. The sample used was 45-200 µm in size, and the percentage of catalyst was 7%. The research was carried out using 4 variations, including 2.9 ml/min, 5.8 ml/min, 9.0 ml/min, and 14.8 ml/min, each of which contains the same air composition, namely 80% nitrogen and 20% oxygen. The results showed that the greater the airflow contained in the pulverized biomass catalytic combustion process could increase the combustion characteristics including reducing the value of ITFC, PT, and BT. In addition, it also accelerates the rate of mass reduction and decreases its activation energy due to increasing pressure along with increasing temperature in the combustion chamber, besides that excess air also causes the combustion that occurs in more perfect combustion.
Co-Authors A.A. Ketut Agung Cahyawan W Abdul Ghofar Adestya Bismandoko Haryantono Putra Akhlis Rizza, Muhammad Alamsah, Azwar Alfonsus Jantong Amanah Hijriah Ana Pratiwi ANGGI FIRMANSYAH Anindito Purnowidodo Ari Wahjudi Aries Boedi Setiawan Aris Kurniawan Aris Subagiyo Astrada Astrada, Astrada Bambang Subroto Candra Trimandoko, Candra Dadang Hermawan Dedy Nataniel Ully Denny Widhiyanuriyawan Dian Dinanti Djoko Wahyudi Djoko Wahyudi Eko Ganis Sukoharsono Eko Siswanto Endang Mardiati Erwin Saraswati Faiz, Naufal Muhammad Farid Majedi Farid Majedi, Farid Fauzan Baananto Fransisca Gayuh Utami Dewi Fransiska Iing Mariandini Gatot Soebiyakto Gugus Irianto Gunawan Prayitno Habibulfalah, Endi Hadi Saroso Hadi Saroso Handono Sasmito I Nyoman Gede Wardana I.N.G. Wardana I.N.G. Wardana I.N.G. Wardana I.N.G. Wardana I.N.G. Wardana I.N.G.Wardana I.N.G.Wardana Ibadurrohman, Ibrahim Ahmad Ilyas Sofana ING Wardana Kusumaningsih, Haslinda Lilik Purwanti Lilis Yuliati Lilis Yuliati Made Aristia Prayudi Marali, Aryati Muhaymin Maulana , Syahrizal Mega Nur Sasongko Moch. Syamsul Ma'arif Moon, Park Jae Muhamad Bula Muhammad Satya Adhitama Munawir Munawir NadaFajar Nurmani'ah Widiarti Nindya Sari Nur Rachman Supadmana Muda Nurul Emil Safitri Nurul Fachriyah Pragiwaka, Rafif Ezrha Praswanto, Djoko Hari Princilvanno Andreas Naukoko Pudya Heryana Purbo Suwandono Purnami Purnami Purnami Raihan Ilyasa Ray Dewi Redi Bintarto Redi Bintarto, Redi Ribka Apriliani Roekhudin, Roekhudin Rudianto Raharjo Rudy Soenoko Rudy Soenoko Sabila, Adriazka Fasa Saputro, Nurhadi Sari, Martina Puspita Sepriyatno, Riswan Slamet Wahyudi Sofana, Ilyas Sudjito Soeparman Sugiarto Sugiarto Suluh Elman Swara Suroso, Yosephine Diajeng Janur Prasasti, As’ad Munawir, Suryaningrat, Muhammad Sutrisno T Syaiful Iqbal Teguh Dwi Widodo Trismawati Trismawati Widya Wijayanti widya wijayanti Widya Wijayanti Wignyanto Wignyanto Wijayanto, Vera Dwi Wijono Wijono Yenni Mangoting Yuliansyah, Fisal Yusuf Hendrawan Zaki Baridwan