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All Journal Pillar of Physics: Jurnal Berkala Ilmiah Fisika
- Ramli
Department of Physics, Universitas Negeri Padang, Jl. Prof. Dr. Hamka Air Tawar Padang 25131
Earth & Planetary Sciences Materials Science & Nanotechnology Physics

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Micro Structure Analysis of Graphne Oxides from Sawn Waste Synthesis using The Modified Hummer Method Gina Fadilah NST; - Ramli; Yenni Darvina; Fadhila Ulfa Jhora
PILLAR OF PHYSICS Vol 16, No 1 (2023)
Publisher : Department of Physics – Universitas Negeri Padang UNP

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.24036/14256171074

Abstract

The manufacture of graphene oxide material based on sawmill waste charcoal has many applications in the field of technology, one of which is microwave absorption. Sawmill waste as the main ingredient is an effort to improve the processing of abundant sawmill waste. This study aims to analyze the microstructural properties of graphene oxide from sawmill waste synthesized by the modified hummer method. Graphene oxide synthesis was carried out using a modified hummer method which was characterized using a Scanning Electron Microscope (SEM), X-ray Diffraction (XRD ), and Fourier Transform Infrared (FTIR). Based on the results  from SEM, the temperatures of 250˚C and 400˚C are perfect graphene oxide blocks. At 300˚C, 350˚C, and  450˚C in the form of sheets. The best results on sem were obtained at 400C with an average diameter of 31.1nm. Based on the results of XRD, it showed a crystal structure in the form of graphene oxide 250˚C, 300˚C, 350˚C, 400˚C, and 450˚C namely Orthorhombic, Cubic, Tetragonal, Hexagonal, and Cubic with the best results at 400˚C where the size The largest average crystal is 53.1 nm. Based on the FTIR results, it contains C, H, and O bonds in the presence of C=O, C=C, O-H, and C-H bonds
Effect of Variation in Pineapple Leaf Fiber Composition with Polyurethane Matrix in Composite Panels on Acoustic Properties and Porosity Putra Adil; Yenni Darvina; - Ramli; Rio Anshari
PILLAR OF PHYSICS Vol 16, No 2 (2023)
Publisher : Department of Physics – Universitas Negeri Padang UNP

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.24036/14571171074

Abstract

Noise can cause medical, psychological, and environmental disturbances. One of the efforts to reduce noise is by using acoustic materials. Acoustic materials can be made using natural fiber composites. This study uses pineapple leaf fiber as fiber and polyurethane as a matrix that will be formed into a sound-absorbing composite panel. This study aims are to determine the effect of variations in the composition of pineapple fiber-reinforced composites with polyurethane matrix on acoustic properties and porosity, determine the effect of frequency on acoustic properties, and determine the relationship between porosity and acoustic properties. The method used in this research uses a characterization tool in the form of a one-microphone impedance tube and porosity test equipment. Composite panels are made by varying the composition of pineapple leaf fibers with polyurethane matrix with the ratio of pineapple leaf fiber composition to polyurethane matrix, namely 50%: 50%, 60%: 40%, 70%: 30%, 80%: 20% and 90%: 10%. Based on the research, it was  found that the more the amount of pineapple leaf fiber composition is used, the absorption coefficient, sound transmission loss, and prostitution will increase while the reflection coefficient decreases. The higher the frequency used, the absorption coefficient and sound transmission loss will increase while the reflection coefficient decreases for all frequencies. The relationship between porosity and acoustic properties is that the higher the porosity, the absorption coefficient and sound transmission loss will increase while the reflection coefficient decreases
Co-Authors Fadhila Ulfa Jhora Gina Fadilah NST Putra Adil Rio Anshari Yenni Darvina