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All Journal International Journal of Renewable Energy Development Jurnal Fisika FLUX Jurnal Penelitian Pendidikan IPA (JPPIPA) PROSIDING SEMINAR NASIONAL FISIKA (E-JOURNAL) Time in Physics: Journal for Theoretical, Instrumentation, Material-Molecular, and Education Physics International Journal of Renewable Energy Development
Sulaeman, Ahmad Sofyan
Department Of Physics, Faculty Of Science, Universitas Mandiri
Agriculture, Biological Sciences & Forestry Biochemistry, Genetics & Molecular Biology Chemical Engineering, Chemistry & Bioengineering Chemistry Control & Systems Engineering Earth & Planetary Sciences Education Electrical & Electronics Engineering Energy Engineering Materials Science & Nanotechnology Mathematics Physics Other

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Sintesis dan Karakterisasi Silicon Carbide (SiC) dari Sekam Padi Menggunakan Metode Reduksi Magnesiotermik Ahmad Sofyan Sulaeman; Sugianto Arjo; Akhiruddin Maddu
Jurnal Fisika FLUX Vol 1, No 1 (2019): Jurnal Fisika Flux Edisi Khusus Januari 2019
Publisher : Lambung Mangkurat University Press

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (1175.202 KB) | DOI: 10.20527/flux.v1i1.6146

Abstract

Silicon Carbide (SiC) merupakan material keramik non-oksida yang memiliki tingkat kekerasan, titik leleh, dan konduktivitas termal yang tinggi. SiC dapat disintesis menggunakan prekursor silika (SiO2) dan karbon (C) dengan memanfaatkan SiO2 sebagai sumber silikon (Si). SiC telah disintesis dari sekam padimenggunakan prekursor SiO2 dan C dengan metode reduksi magnesiotermik. Sintesis SiC dilakukan dengan mencampurkan SiO2 dan C pada perbandingan rasio 1:3, kemudian diberi penambahan magnesium (Mg) dengan variasi massa dari 1,0 g, 1,5 g, dan 2,0 g. Selanjutnya, semua sampel dipanaskan dalam furnace pada temperatur 600 C selama 3 jam. Fase terbentuknya SiC diindikasikan dengan warna fisik pada setiap sampel yang berubah dari abu-abu menjadi putih kehijauan. Selanjutnya serbuk SiC dikarakterisasi menggunakan fourier transform infrared (FTIR) untuk mengetahui gugus fungsi dan X-Ray Diffractometer (XRD) untuk mengetahui derajat kristalinitas, sudut difraksi 2 , dan jarak antar kisi (d). Hasil karakterisasi FTIR menunjukkan adanya ikatan Si–C pada bilangan gelombang  786,89 – 941,19 cm-1. SiC yang diperoleh pada semua sampel memiliki struktur kubik (β-phase) atau dapat disebut β–SiC dengan karakteristik dhkl (111) dan parameter kisi pada kisaran 0,43 nm berdasarkan analisa menggunakan XRD. Penambahan 1 g Mg menghasilkan SiC yang terbaik dengan puncak intensitas difraksi 54 a.u pada sudut 36,04 . Semakin tinggi penambahan Mg pada proses sintesis menyebabkan penurunan intensitas, derajat kristalinitas, dan memperbesar ukuran kristal β–SiC. β–SiC yang disintesis dari sekam padi dengan temperatur rendah ini dapat diaplikasikan sebagai material keramik. Namun, diperlukan karakterisasi lebih lanjut menggunakan thermogravimetrical analysis (TGA) untuk mengetahui titik leleh serbuk SiC.
Enhancing Ionic Conductivity of Carboxymethyl Cellulose-Lithium Perchlorate with Crosslinked Citric Acid as Solid Polymer Electrolytes for Lithium Polymer Batteries Akhiruddin Maddu; Ahmad Sofyan Sulaeman; Setyanto Tri Wahyudi; Abdulloh Rifai
International Journal of Renewable Energy Development Vol 11, No 4 (2022): November 2022
Publisher : Center of Biomass & Renewable Energy, Diponegoro University

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.14710/ijred.2022.40090

Abstract

Lithium batteries development are triggered so many efforts in producing electronic devices due to its excellent performance as energy storage systems. One of the appealing points solid polymer electrolytes for developing solid-state lithium batteries. In this study, Solid polymer electrolytes with crosslinked treatment (SPE-C) were prepared from carboxymethyl cellulose-lithium perchlorate (CMC-LiClO4) and citric acid (CA) as a crosslinker via solution casting method. All SPE-C membranes were assembled into lithium battery coin cells. Degree of crosslinked and degradation were measured to observe crosslink formation in SPE-C membranes and confirmed by fourier transform infrared (FTIR), whereas SPE-C in coin cells were characterized by electrochemical impedance spectroscopy (EIS) and linear sweep voltammograms (LSV). The results showed that crosslinked process is successfully obtained with C=O from ester linkage of CA vibration within COO- of CMC for the crosslinking bond formation. The crosslink effect also contributed on enhancing ionic conductivities of SPE-C in coin cells from EIS results. The highest ionic conductivity was obtained in SPE-C2 (1.24×10-7 S/cm) and electrochemically stable in 2.15 V based on LSV measurement. SPE-C2 has good dielectric behavior than the others due to the high ions mobilities for migration process from ion clusters formation, thus it would be useful for further study in obtaining the powerful solid-state lithium polymer batteries.
ABSORBAN ION LOGAM CU (II) BERBASIS HIDROGEL SUPERABSORBAN CMC–G–PKA/NAALG DENGAN TEKNIK IRADIASI SINAR GAMMA Permono Adi Putro; Ahmad Sofyan Sulaeman; Erizal Erizal; Imas Ratna Ermawati
PROSIDING SEMINAR NASIONAL FISIKA (E-JOURNAL) Vol 7 (2018): PROSIDING SEMINAR NASIONAL FISIKA (E-JOURNAL) SNF2018
Publisher : Program Studi Pendidikan Fisika dan Program Studi Fisika Universitas Negeri Jakarta, LPPM Universitas Negeri Jakarta, HFI Jakarta, HFI

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (298.279 KB) | DOI: 10.21009/03.SNF2018.02.PA.01

Abstract

Abstrak Hidrogel Superabsorban (HSA) CMC-g-PKA/NaAlg telah disintesis menggunakan iradiasi sinar gamma sebagai crosslinker dengan dosis 10 kGy. HSA disintesis dengan variasi massa CMC, yaitu 1,0 g, 1,5 g, 2,0 g, dan 2,5 g. Kemampuan HSA dalam menyerap ion logam Cu (II) telah dipelajari menggunakan spektrofotometer UV-Vis. Pengujian dilakukan dengan variasi konsentrasi ion logam Cu (II) yaitu, 1%, 2%, 3%, 4%, dan 5% selama 30 menit. Nilai absorbansi pada ion logam Cu (II) meningkat seiring dengan peningkatan massa CMC. Nilai absorbansi terbesar, yaitu 74% pada massa CMC 2,5 g. Pengujian FTIR mencirikan adanya interaksi antara gugus (OH) hidroksil, (NH2) amina, dan karboksilat (COOH), terhadap ion logam Cu­ (II) pada bilangan gelombang 3653,18 1/cm, 1442,75 1/cm, dan 1587,42 1/cm. Kata-kata kunci: HSA, Absorbansi, ion logam Cu (II), UV-Vis, FTIR Abstract Hydrogel Superabsorbent (HSA) CMC-g-PKA/NaAlg has been synthesized using gamma-ray irradiation as a 10 kGy crosslinker. HSA is synthesized with CMC mass variations, i.e. 1.0 g, 1.5 g, 2.0 g, 2.5 g. HSA’s ability to absorb Cu (II) metal ions has been studied using the UV-Vis spectrophotometer. The test was performed with variation of Cu (II) ion concentration i.e. 1%, 2%, 3%, 4%, and 5% for 30 minutes. The absorbance value of Cu (II) metal ions increases with increasing mass of CMC. The largest absorbance value, i.e., 74% in CMC mass 2.5 g. The FTIR test characterizes the interaction of hydroxyl (OH), amine (NH2), and Carboxylic (COOH), groups to Cu-(II) metal ions in wave number 3653,18 1/cm, 1442,75 1/cm, and 1587,42 1/cm. Keywords: HSA, Absorbance, Cu (II) metal ions, UV-Vis, FTIR.
Enhancing Ionic Conductivity of Carboxymethyl Cellulose-Lithium Perchlorate with Crosslinked Citric Acid as Solid Polymer Electrolytes for Lithium Polymer Batteries Akhiruddin Maddu; Ahmad Sofyan Sulaeman; Setyanto Tri Wahyudi; Abdulloh Rifai
International Journal of Renewable Energy Development Vol 11, No 4 (2022): November 2022
Publisher : Center of Biomass & Renewable Energy, Diponegoro University

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.14710/ijred.2022.40090

Abstract

Lithium batteries development are triggered so many efforts in producing electronic devices due to its excellent performance as energy storage systems. One of the appealing points solid polymer electrolytes for developing solid-state lithium batteries. In this study, Solid polymer electrolytes with crosslinked treatment (SPE-C) were prepared from carboxymethyl cellulose-lithium perchlorate (CMC-LiClO4) and citric acid (CA) as a crosslinker via solution casting method. All SPE-C membranes were assembled into lithium battery coin cells. Degree of crosslinked and degradation were measured to observe crosslink formation in SPE-C membranes and confirmed by fourier transform infrared (FTIR), whereas SPE-C in coin cells were characterized by electrochemical impedance spectroscopy (EIS) and linear sweep voltammograms (LSV). The results showed that crosslinked process is successfully obtained with C=O from ester linkage of CA vibration within COO- of CMC for the crosslinking bond formation. The crosslink effect also contributed on enhancing ionic conductivities of SPE-C in coin cells from EIS results. The highest ionic conductivity was obtained in SPE-C2 (1.24×10-7 S/cm) and electrochemically stable in 2.15 V based on LSV measurement. SPE-C2 has good dielectric behavior than the others due to the high ions mobilities for migration process from ion clusters formation, thus it would be useful for further study in obtaining the powerful solid-state lithium polymer batteries.
Kajian Fluktuasi Sifat Dielektrik Telur Puyuh yang Bervariasi pada Lama Penyimpanan Irawan, Bagus; Maddu, Akhiruddin; Rustami, Erus; Sulaeman, Ahmad Sofyan; Putro, Permono Adi
TIME in Physics Vol. 2 No. 1 (2024): March
Publisher : Universitas Mandiri

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.11594/timeinphys.2024.v2i1p41-49

Abstract

An increasing of public attention to the quality of food has been increasing, recently. One type of food that consumed is quail eggs (QE). In this study, QE were tested by Electrochemical Impedance Spectroscopy (EIS) method with some parameters such as complex impedance, dielectric constant, and loss tangent analysis. Several interesting results showed that dielectric properties of QE experience a fluctuation phenomenon if the test is influenced by storage duration, qualitatively. Therefore, we approximately prove that QE quality can be tested via EIS to obtain fine results.
Canonical Correlation Analysis and Its Extension for SSVEP-based BCI Detection: A Systematic Review Suhendra, Muhamad Agung; Robiyana, Iqbal; Sumardi, Tedi; Sulaeman, Ahmad Sofyan; Putro, Permono Adi; Nurizati, Nurizati; Suryadi, Usep Tatang; Wijaya, Anderias Eko; Ajidarmo, Sunanto; Budiman, Arief; Amri, M. Faizal
Jurnal Penelitian Pendidikan IPA Vol 10 No 12 (2024): December
Publisher : Postgraduate, University of Mataram

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.29303/jppipa.v10i12.9844

Abstract

SSVEP-based Brain-Computer Interfaces (BCIs) utilize steady-state visual evoked potentials, which are brain responses triggered by visual stimuli flickering at specific frequencies. Users can focus on these stimuli, allowing the system to interpret their intent based on the brain's electrical activity. This technology has applications in communication for individuals with disabilities, gaming, and neuro-feedback, offering an ultimate means of interaction through thought alone. In this study, systematic literature review was conducted to identify analytical methods for SSVEP spellers with PRISMA method from the eligibility criteria. CCA and its extension become gold-standar method that give excellent performances for SSVEP recognition and signal classification. Some uniques features also found such as MsetCCA, FB-CCA, MF-CCA, TW-CCA, CP-CCA, IIS-CCA, TT-CCA and RLS-CCA. Therefore, we have various options for choosing the best method for recognizing SSVEP from EEG signals based BCI.
Co-Authors Abdulloh Rifai Akhiruddin Maddu Amri, M. Faizal Arief Budiman Bagus Irawan Erizal Erizal Imas Ratna Ermawati, Imas Ratna Iqbal Robiyana Nurizati Nurizati Permono Adi Putro Rustami, Erus Setyanto Tri Wahyudi Sugianto Arjo Suhendra, Muhamad Agung Sumardi, Tedi Tedi Sumardi Usep Tatang Suryadi, Usep Tatang