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Rahmat Setiawan Mohar
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Electrical & Electronics Engineering Energy Physics Other

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ANALYSIS STUDY OF CLOVE LEAF (SYZYGIUM AROMATICUM) EXTRACT ABSORBANCE USING UV-VIS SPECTROPHOTOMETER: STUDI ANALISIS ABSORBANSI EKSTRAK DAUN CENGKEH (SYZYGIUM AROMATICUM) MENGGUNAKAN UV-VIS SPECTROPHOTOMETER Natasya Frysilia Wardanni; Iwan Sugihartono; Anggara Budi Susila; Rahmat Setiawan Mohar
PROSIDING SEMINAR NASIONAL FISIKA (E-JOURNAL) Vol. 13 (2025): PROSIDING SEMINAR NASIONAL FISIKA (E-JOURNAL) SNF2024
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 | DOI: 10.21009/03.1301.FA17

Abstract

This study reports that clove (Syzygium aromaticum) leaf extract was used as a reducing agent and deionized water was used as a solvent. In the process of making the extract, as much as 20 grams of clove leaf powder was mixed with 100 mL of deionized water and boiled using a hotplate magnetic stirrer for 2 hours at a temperature of 70°C. Then, the extract solution was filtered using 11 cm diameter filter paper and centrifuged at 4000 rpm for 30 minutes to obtain clove leaf extract. The extract was characterized using UV-Vis Spectrophotometer to analyze the absorbance and energy band gap. Based on the absorbance test results, clove leaf extract showed maximum absorption at a concentration of 1000 ppm with a wavelength of 221 nm and at a concentration of 500 ppm with a wavelength of 225 nm. The energy band gap value at a concentration of 1000 ppm is 3.26 eV and at a concentration of 500 ppm 3.38 eV.
STUDY OF ENERGY BAND GAP IN NANO ZnO STRUCTURE FROM REFLECTANCE PATTERNS: STUDI BAND GAP ENERGI STRUKTUR NANO ZnO DARI POLA REFLEKTANSI Syeha Lutfiah; Iwan Sugihartono; Rahmat Setiawan Mohar; Isnaeni; Maykel Manawan
PROSIDING SEMINAR NASIONAL FISIKA (E-JOURNAL) Vol. 13 (2025): PROSIDING SEMINAR NASIONAL FISIKA (E-JOURNAL) SNF2024
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 | DOI: 10.21009/03.1301.FA19

Abstract

Nanostructured Zinc Oxide (ZnO) has been successfully synthesized using hydrothermal method. All precursors were mixed and stirred using an ultrasonic cleaner for 10 minutes until the sample was homogeneously mixed. Then, the samples were put into a Teflon-coated stainless steel autoclave and heated at 100ºC for 6 hours. Characterization of the optical properties of ZnO nanoparticles was carried out using UV-Vis Diffuse Reflectance spectrophotometer test. Furthermore, the optical properties will be analyzed referring to the reflectance pattern so that the band gap energy of ZnO nanoparticles can be determined using the Tauc Plot technique. The results of Tauc Plot analysis show that the band gap energy of ZnO nanoparticles is at 2.97 eV.
EXTRACTION AND ABSORBANCE PROPERTIES TEST OF OIL FROM SACHA INCHI SEEDS (PLUKENETIA VOLUBILIS L.): EKSTRAKSI DAN UJI SIFAT ABSORBANSI MINYAK DARI BIJI TANAMAN SACHA INCHI (PLUKENETIA VOLUBILIS L.) Selvi Puspita Dewi; Agus Setyo Budi; Jaja Jamaludin; Rahmat Setiawan Mohar; Nurfina Yudasari; Iwan Sugihartono
PROSIDING SEMINAR NASIONAL FISIKA (E-JOURNAL) Vol. 13 (2025): PROSIDING SEMINAR NASIONAL FISIKA (E-JOURNAL) SNF2024
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 | DOI: 10.21009/03.1301.FA31

Abstract

The seeds of the sacha inchi plant (Plukenetia volubilis L.) have been extracted using the cold pressing method at a temperature of 45°C and a pressure of 600 bar or 60 MPa. Seeds come from sacha inchi plants grown at an altitude of 200 and 500 masl each with an oil volume of 100 ml. Testing of absorbance properties will be carried out using the UV-Vis spectrophotometer technique. So that the absorbance spectrum pattern are expected to provide information on the characteristics of the substance content possessed by the sacha inchi plant, namely lipids/fatty acids, proteins, tocopherols, phytosterols, phenolic components, fiber, antioxidants, carbohydrates, vitamins, polyphenols, and minerals.
Co-Authors Agus Setyo Budi Anggara Budi Susila Aulia Putri Isnaeni Iwan Sugihartono Jamaludin, Jaja - Maykel Manawan Natasya Frysilia Wardanni Nurfina Yudasari Selvi Puspita Dewi Shafa Rahma Cyrilla Syeha Lutfiah