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All Journal JURNAL KIMIA SAINS DAN APLIKASI Jurnal Fisika Unand
Defrizal, Muhammad
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Chemical Engineering, Chemistry & Bioengineering Chemistry Earth & Planetary Sciences Electrical & Electronics Engineering Energy Engineering Materials Science & Nanotechnology Physics

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Impact of Modifying Filler into Porous on Hydrophobicity Behaviour of The Silica-HDPE Composite Defrizal, Muhammad; Kemala, Tetty; Khotib, Mohammad
Jurnal Kimia Sains dan Aplikasi Vol 28, No 4 (2025): Volume 28 Issue 4 Year 2025
Publisher : Chemistry Department, Faculty of Sciences and Mathematics, Diponegoro University

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.14710/jksa.28.4.168-175

Abstract

Even though the approach is relatively simple and does not require additional treatment, the porous filler method has not been widely utilized to boost the composite’s hydrophobicity. Therefore, this study wants to show that silica’s porosity as a filler material affects the surface roughness and hydrophobicity of its composite (in this case, silica-HDPE). Pore formation in silica uses the soft-template method with Tween-80 as the mould. The amount of surfactant was varied by 0, 5, and 10 g. The particles are then physically composited into the HDPE matrix. Surface characterization of silica particles analyzed by Brunauer-Emmett-Teller (BET) shows enhancement in particle porosity as the amount of surfactant added is increased. When it is inserted into HDPE, the silica particles with the highest porosity have the greatest surface roughness. It is confirmed by the wavy surface texture of this composite when it is characterized using an Atomic Force Microscope (AFM). These results are accompanied by a significant enhancement in the contact angle value at each concentration. From the contact angle and AFM data, porous silica has the role of surface texture provider in raising its roughness. It affects the improvement of the hydrophobicity according to the Cassie-Baxter equation, which states that the more air fraction formed on a surface, the higher the contact angle obtained.
Karakterisasi Koefisien Absorbsi Bunyi dan Impedansi Akustik Dari Sekam Padi Defrizal, Muhammad; Elvaswer, Elvaswer
Jurnal Fisika Unand Vol 10 No 3 (2021)
Publisher : Universitas Andalas

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.25077/jfu.10.3.351-356.2021

Abstract

Penelitian ini menentukan koefisien absorbsi bunyi dan impedansi akustik dari panel sekam padi menggunakan metode tabung impedansi.  Sampel panel akustik divariasikan densitasnya dari 0,4 g/cm3; 0,5 g/cm3; 0,6 g/cm3 dan 0,7 g/cm3.  Pengukuran dilakukan pada frekuensi 500 Hz, 1000 Hz, 2000 Hz, 4000 Hz dan 8000 Hz.  Hasil penelitian memperlihatkan bahwa nilai koefisien absorbsi bunyi paling tinggi adalah 0,99 pada frekuensi 4000 Hz untuk densitas 0,4 g/cm3.  Secara teori nilai ini terlalu tinggi, hal ini disebabkan oleh anomali dimana terdapat celah dipinggiran sampel dengan tabung. Nilai tertinggi yang sesuai adalah 0,86 dengan densitas 0,5 g/cm3 pada frekuensi 2000 Hz.  Nilai impedansi akustik tertinggi 1,84 dyne.s/cm5 pada frekuensi 4000 Hz dengan densitas 0,5 g/cm3. This study determined the sound absorption coefficient and acoustic impedance of the rice husk panels using the impedance tube method. The density of acoustic panel samples varied from 0,4 g/cm3; 0,5 g/cm3; 0,6 g/cm3 and 0,7 g/cm3. Measurements were made at a frequency of 500 Hz, 1000 Hz, 2000 Hz, 4000 Hz and 8000 Hz. The results showed that the highest sound absorption coefficient was 0,99 at a frequency of 4000 Hz for a density of 0,4 g/cm3.  In theory this value is too high, this is due to anomaly where there is a gap between the sample and the tube. The highest suitable value is 0,86 with a density of 0,5 g/cm3 at a frequency of 2000 Hz. The highest acoustic impedance value is 1,84 dyne.s/cm5 at a frequency of 4000 Hz with a density of 0,5 g/cm3    Penelitian ini menentukan koefisien absorbsi bunyi dan impedansi akustik dari panel sekam padi menggunakan metode tabung impedansi.  Sampel panel akustik divariasikan densitasnya dari 0,4 g/cm3; 0,5 g/cm3; 0,6 g/cm3 dan 0,7 g/cm3.  Pengukuran dilakukan pada frekuensi 500 Hz, 1000 Hz, 2000 Hz, 4000 Hz dan 8000 Hz.  Hasil penelitian memperlihatkan bahwa nilai koefisien absorbsi bunyi paling tinggi adalah 0,99 pada frekuensi 4000 Hz untuk densitas 0,4 g/cm3.  Secara teori nilai ini terlalu tinggi, hal ini disebabkan oleh anomali dimana terdapat celah dipinggiran sampel dengan tabung. Nilai tertinggi yang sesuai adalah 0,86 dengan densitas 0,5 g/cm3 pada frekuensi 2000 Hz.  Nilai impedansi akustik tertinggi 1,84 dyne.s/cm5 pada frekuensi 4000 Hz dengan densitas 0,5 g/cm3.
Co-Authors Elvaswer Elvaswer Mohammad Khotib Tetty Kemala