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All Journal Chimica et Natura Acta Indonesian Journal of Physics (IJP) eProceedings of Engineering
Adhika, Damar Rastri
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Agriculture, Biological Sciences & Forestry Astronomy Biochemistry, Genetics & Molecular Biology Chemistry Computer Science & IT Control & Systems Engineering Earth & Planetary Sciences Electrical & Electronics Engineering Energy Engineering Environmental Science Industrial & Manufacturing Engineering Materials Science & Nanotechnology

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Mechanical Traction Test of Pineapple Leaf Fiber-Epoxy Composite Noeriman, Abiyoga; widayani, widayani; Adhika, Damar Rastri
Indonesian Journal of Physics Vol 35 No 1 (2024): vol 35 no 1 2024
Publisher : Institut Teknologi Bandung

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.5614/itb.ijp.2024.35.1.5

Abstract

Natural fiber-based composites are widely developed to replace materials in various industries, such as furniture and sound absorbers. One of the composite properties that is often considered for its use is mechanical property. In this study, the mechanical properties of pineapple leaf fiber-epoxy composites were studied using traction tests. The composite was made by mixing of small pieces of pineapple leaf fiber with epoxy resin, then the mixture was placed in a mold and pressed with a certain pressure at 100 °C for 2 hours. Traction tests were carried out on the pineapple leaf fiber-epoxy composites with two different epoxy concentrations (11 and 17 % wt), and different manufacturing pressure (0.22; 0.65; 1.09 MPa). The traction test results show that the maximum stress (ultimate tensile strength/UTS), elongation at break (EAB) and modulus of elasticity (E) increase with increasing epoxy content. Increasing the manufacturing pressure increases modulus of elasticity. However, the maximum UTS and EAB were shown by the composite with a manufacturing pressure of 0.65 Pa, not at the higher pressure (1.09 Pa).
Variasi Volume Tuang Prototipe Elektroda Fleksibel Berbasis Nanokomposit Zno/Pva Untuk Aplikasi Emg Wahyudi, Diki Ribut; Ismardi, Abrar; Adhika, Damar Rastri
eProceedings of Engineering Vol. 11 No. 2 (2024): April 2024
Publisher : eProceedings of Engineering

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Abstract

Penggunaan elektroda sangat penting dalamhal medis, salah satunya dalam bidang pengawasanKesehatan seperti EMG. Dimana EMG (Electromyography)merupakan metode perekaman sinyal yang dihasilkan olehotot-otot tubuh manusia dengan menggunakan alat perekam.Elektroda koversial untuk pengaplikasian EMG masihmemiliki keterbatasan dalam pembacaan sinyal otot.Elektroda fleksibel merupakan studi yang diangkat untukmengembangkan elektroda. Prototipe elektroda fleksibelberbasis nanokomposit ZnO/PVA dengan doping grapheneuntuk pengaplikasian EMG. Proses pembuatan elektrodafleksibel telah ditetapkan dengan penambahan 5% graphenedengan empat variasi volume tuang. Untuk volume tuangyang dilakukan adalah 10; 6.7; 5; dan 4 ml dengan masingmasingketebalan rata-rata adalah 0.186; 0.163; 0.086; dan0.071 mm. Pengujian dilakukan untuk melihat karakteristikdari sifat listrik dan mekanik, serta nilai SNR dan ujiimpedansi yang dilakukan. Dengan variasi volume tuangdapat mengurangi nilai hambatan dan rongga yang tidakdiinginkan, sehingga dapat meningkatkan akurasi sinyalEMG yang dihasilkan. Kata kunci— EMG, Elektroda Fleksibel, ZnO/PVA, Volume Tuang
Potential of Chitosan-Encapsulated Mango Leaf Extract Nanoemulsion as Fruit Packaging Putra, Panji Setya Utama; Adhika, Damar Rastri; Asri, Lia Amelia Tresna Wulan
Chimica et Natura Acta Vol 13, No 3 (2025)
Publisher : Departemen Kimia

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.24198/cna.v13.n3.56202

Abstract

Fruits have a relatively short shelf life. One of the extensively researched preservation methods for fruits is edible coating. Edible coating is a method of coating food products with a polymer layer. Considering the environmental and sustainability aspects, edible coatings were synthesized from biodegradable polymers derived from polysaccharides. Chitosan is a widely developed and researched type of biopolymer due to its antimicrobial activity. In addition to antimicrobial activity, antioxidant properties are important in food packaging applications. Mango leaves (Mangifera indica L.) contain various secondary metabolites that play a role in antioxidant activity, such as mangiferin, gallic acid, flavonoids, and gallotanin. In this study, mango leaf extract nanoemulsion was synthesized to improve the antioxidant and anti-UV properties of biopolymer chitosan-based fruit packaging. Mango leaf extract nanoemulsion was synthesized using surfactant and ultrasonication methods. The results of Particle Size Analyzer (PSA) measurements showed that the size of all nanoemulsions was 83-99 nm. Observations with Transmission Electron Microscope (TEM) showed that the nanoemulsion was spherical with a 15-46 nm size range. The UV-Vis spectrophotometer instrument was used to test antioxidant properties using the DPPH reagent and anti-UV activity. These tests showed that adding mango leaf extract concentration to the nanoemulsion system increased DPPH inhibition and absorbance against UV light. The results of the performance test of mango leaf extract nanoemulsion encapsulated by chitosan have a high potential to be used as a bio-based edible coating matrix and a substitute for materials that are difficult to degrade.
Co-Authors Abrar Ismardi Asri, Lia Amelia Tresna Wulan Noeriman, Abiyoga Putra, Panji Setya Utama Wahyudi, Diki Ribut widayani, widayani