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All Journal ALCHEMY Jurnal Penelitian Kimia Journal of Electrical, Electronic, Information, and Communication Technology (JEEICT) BULETIN FISIKA
Teguh Endah Saraswati
Sebelas Maret University
Astronomy Chemical Engineering, Chemistry & Bioengineering Chemistry Computer Science & IT Control & Systems Engineering Electrical & Electronics Engineering Energy Environmental Science Materials Science & Nanotechnology Medicine & Pharmacology Physics

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Plasma Characteristics of Under-water Arc Discharge in Nanoparticle Fabrication Athaya Cantia Putri; Miftahul Anwar; Irwan Iftadi; Agus Ramelan; Feri Adrianto; Teguh Endah Saraswati
Journal of Electrical, Electronic, Information, and Communication Technology Vol 4, No 1 (2022): JOURNAL OF ELECTRICAL, ELECTRONIC, INFORMATION, AND COMMUNICATION TECHNOLOGY
Publisher : Universitas Sebelas Maret (UNS)

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.20961/jeeict.4.1.61081

Abstract

Synthetic nanoparticles are the process of making particles with a size of less than 100 nm and changing the properties of the material so that it can be improved to improve the usability of new products. One method that can be used is the arc discharge method in water, which is a synthetic method of nanoparticles, which is very simple because it does not require complicated equipment. This study uses graphene as an electrode, which is then immersed in water and mounted horizontally. Current and voltage monitoring is carried out during the arc discharge process using a Hall-based current sensor and the voltage is measured directly between the two electrodes. Variations in input current of 10A, 40A, 70A, and 100A affect the arc formed, current and voltage, and ionization energy. Monitoring with OES is also carried out to determine the shape of the plasma, and the wavelength when the arc occurs. The results obtained that the current has more effective and optimal results in synthesizing nanoparticles.
The Synergistic Enhancement of Electromagnetic Interference Shielding Polymer Composites using Carbon Nanofiber-Metal Oxide Hybrid Fillers Dini Deviana Saputri; Teguh Endah Saraswati; Wijang Wisnu Raharjo
ALCHEMY Jurnal Penelitian Kimia Vol 21, No 2 (2025): September
Publisher : UNIVERSITAS SEBELAS MARET (UNS)

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.20961/alchemy.21.2.97322.224-240

Abstract

In this modern era, humans cannot be separated from utilizing electronic devices. The unwanted noise or disturbance problem in electronic devices is majorly caused by Electromagnetic Interference (EMI). Recent technology and materials are being developed to manufacture EMI shielding composites. Carbon nanomaterial-based composites have become a very attractive material because of their lightweight, incredible mechanical, thermal, and conductivity properties. Carbon nanofibers (CNFs) and metal oxides are promising combination materials that reveal unique properties of both components to enhance shielding effectiveness. This combination of CNFs and metal oxides results in a synergistic effect, where the conductive CNFs enhances the reflection of EMI, and the metal oxides contribute to the absorption and attenuation of the waves. In this review article, the authors focus on the extensive discussion about the synthesis method of producing CNFs, some studies that combine CNFs and metal oxide, and some reports about using CNFs-metal oxide as a hybrid filler in the EMI shielding composites.
Comparison of Emission Spectrum in Series and Parallel Configured Dielectric Barrier Discharge (DBD) Reactors and Its Application for Textile Wastewater Treatment Ahmad Faruq Abdurrahman; Kusumandari Kusumandari; Teguh Endah Saraswati
BULETIN FISIKA Vol. 26 No. 2 (2025): BULETIN FISIKA
Publisher : Departement of Physics Faculty of Mathematics and Natural Sciences, and Institute of Research and Community Services Udayana University, Kampus Bukit Jimbaran Badung Bali

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.24843/BF.2025.v26.i02.p07

Abstract

Textile wastewater represents one of the world's largest aquatic pollutants due to industrial activities. Ozonation, an advanced oxidation process (AOP), serves as a cost-effective wastewater treatment method. This study compares emission spectra from series and parallel-configured dielectric barrier discharge (DBD) reactors and correlates them with ozone production for textile wastewater treatment. The discharge emission spectrum (OES) was analyzed to identify reactive species, while ozone concentration was quantified via titration. Ozonation was applied for 0ā€“60 minutes, monitoring absorbance, dissolved oxygen (DO), total dissolved solids (TDS), total suspended solids (TSS), and conductivity. OES analysis revealed higher emission intensities of OH radicals and Nā‚‚ in the series configuration versus parallel, indicating enhanced plasma reactivity. Consequently, the series configuration yielded superior ozone production, achieving 53.14% degradation efficiency after 60 minutes. Significant reductions in absorbance, TDS, TSS, and conductivity occurred alongside increased DO. Longer treatment durations improved degradation efficiency.
Co-Authors Agus Ramelan Ahmad Faruq Abdurrahman Athaya Cantia Putri Dini Deviana Saputri Feri Adrianto Irwan Iftadi Kusumandari Kusumandari Miftahul Anwar Wijang Wisnu Raharjo