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All Journal Penelitian Pendidikan Jurnal Ilmu Dasar Jurnal Penelitian Pendidikan IPA (JPPIPA) JURNAL PENDIDIKAN TAMBUSAI Eksakta : Berkala Ilmiah Bidang MIPA Pillar of Physics Education : Jurnal Berkala Ilmiah Pendidikan Fisika Pillar of Physics: Jurnal Berkala Ilmiah Fisika Phydagogic : Jurnal Fisika dan Pembelajarannya
Riri Jonuarti
Universitas Negeri Padang
Agriculture, Biological Sciences & Forestry Astronomy Biochemistry, Genetics & Molecular Biology Chemical Engineering, Chemistry & Bioengineering Chemistry Civil Engineering, Building, Construction & Architecture Computer Science & IT Control & Systems Engineering Earth & Planetary Sciences Education Energy Engineering Environmental Science Materials Science & Nanotechnology Mathematics Mechanical Engineering Physics Social Sciences Other

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Mechanical Characteristics of Organic Waste-Based Biodegradable Plastics with Variations in Cellulose Concentration and Synthesis Temperature Cahyaningrum, Wahyu; Jonuarti, Riri; Gusnedi, -; Jhora, Fadhila Ulfa
PILLAR OF PHYSICS Vol 17, No 1 (2024)
Publisher : Department of Physics – Universitas Negeri Padang UNP

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.24036/15279171074

Abstract

Biodegradable plastic is an innovative plastic material that is environmentally friendly because it has the property of being easily decomposed naturally by the activity of microorganisms.   Biodegradable plastics are generally made from starch and cellulose which are natural polymer materials that are easily decomposed in nature. Some organic wastes contain a lot of starch and cellulose, one of which is cassava peel and corn cob waste. In this study, starch from cassava peels was used as raw material in the manufacture of biodegradable plastics and cellulose from corn cobs which functioned as filler. The purpose of this study are to determine the effect of corn cob cellulose concentration and synthesis temperature on the mechanical properties and biodegradability of biodegradable plastics. In this study, the method used to make biodegradable plastic is by using the material mixing method. There are two treatment factors, namely variations in corn cob cellulose concentration of 0%, 1%, and 2% and synthesis temperature with variations of 70˚C, 80˚C, and 90˚C. The results showed the best characteristics for the tensile strength test at the addition of 2% of cellulose concentration and 90˚C synthesis temperature of 2.31 MPa. While the best elongation value is at 0% cellulose concentration and 90˚C synthesis temperature of 21%. The best biodegradation results were obtained from the addition of a cellulose concentration of 2% and synthesis temperature of 70˚C which decomposed perfectly in the soil for 8 days
Analysis Titanium Dioxide and Zinc Oxide in Physical Sunscreen Commercial with Protection Value 35 SPF Sofaturrohman, Fuad; Rifka, Lia; Syalsabilla, Maritza; Syuriyani, Mira; Raisa, Nadia; Jonuarti, Riri; Ratnawulan, -; Hidayat, Rahmat
PILLAR OF PHYSICS Vol 17, No 1 (2024)
Publisher : Department of Physics – Universitas Negeri Padang UNP

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.24036/15007171074

Abstract

This is descriptive research. A descriptive analysis method is a method of explaining symptoms using various variables from the study that are related to one another. This study investigated the shape, size, and composition of TiO2 and ZnO nanoparticles used in sunscreens to reflect and scatter ultraviolet radiation. The study focuses on the effects of these inorganic substances on ultraviolet and visible light absorption and reflection. XRF, UV-Vis spectroscopy, and XRD were used to analyze TiO2 and ZnO particles taken from 50-SPF sunscreen. The concentrations of TiO2 and ZnO in the product were 29.625% and 0.045%, respectively. The sizes of TiO2 and ZnO are obtained using a systematic equation, with the TiO2-particle nanosize of 26.31 nm in the form of TiO2-anorthic respectively. Based on the results obtained, the greater the TiO2 and ZnO content used, the greater the UV absorbance produced. Maximum absorbance indicates that electrons cannot absorb energy at that wavelength, so the energy is just passed through. Meanwhile, the greater the TiO2 and ZnO content used, the less reflectance there is in the UV region, and the visible light produced will also increase. Meanwhile, the greater the TiO2 and ZnO content used, the greater the reflectance in the UV region and the visible light produced
Pengaruh Variasi Ukuran Partikel ZnO terhadap Morfologi Permukaan dan Sifat Optik pada Lapisan Tipis ZnO-GO Indri Saputri Pertama; Riri Jonuarti; Yenni Darvina; Fadhilla Ulfa Jhora
Jurnal Pendidikan Tambusai Vol. 8 No. 2 (2024)
Publisher : LPPM Universitas Pahlawan Tuanku Tambusai, Riau, Indonesia

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Abstract
Pengaruh Variasi Komposisi ZnO/GO terhadap Sifat Optik dan Elektronik ZnO/GO sebagai Kandidat Katalis Solar Cell Tika Rahmadani; Riri Jonuarti; Ratnawulan Ratnawulan; Rahmat Hidayat
Jurnal Pendidikan Tambusai Vol. 8 No. 2 (2024)
Publisher : LPPM Universitas Pahlawan Tuanku Tambusai, Riau, Indonesia

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Abstract

Solar cell dapat berperan sebagai sumber energi bersih dan terbarukan dengan memanfaatkan energi matahari menjadi energi listrik. Solar cell berbahan silikon sangat diminati, namun tarif untuk pembuatan mahal, berbahaya pada proses fabrikasinnya masih belum diketahui secara luas. Lalu dikembangkan material baru untuk solar cell seperti zinc oxide dan graphene oxide. Tujuan dari penelitian ini adalah untuk mengetahui pengaruh komposisi ZnO/GO terhadap sifat optik dan elektronik pada komposit ZnO/GO pada komposit ZnO/GO sehingga di dapatkan variasi komposisi ZnO/GO. Jenis penelitian ini adalah eksperimental, yang mana penelitian ini diawali dari mensisntesis ZnO/GO dengan metoda milling dan metode sol-gel untuk memvariasaikan komposisi lalu dikarakterisasi dengan XRD, SEM dan spektrofotometeri UV-Vis. Hasil penelitian menunjukan pengaruh komposisi seng oksida (ZnO) dan graphene oxide terhadap sifat optic dan elektronik adalah dengan perbedaan komposisi ZnO/GO dari proses milling dan metode sol-gel di dapat semakin banyak komposisi GO maka ukuran kistalin yang didapatkan semakin kecil, semakin banyak Zn Omaka ukuran kristalin yang didapatkan semakin besar. Begitu juga dengan ukuran partikel, band gap dan absorbansi. Pada penelitian yang telah dilakukan, pengaruh variasi komposisi ZnO/Graphene oxide yang diselidiki yaitu 1:10; 1:20 dan 2:20 dengan metode sol-gel. Dari hasil analisis ddidapatkan besar ukuran kristal berturut-turut sebesar 36,35894; 44,99598 dan 38,85449. Nilai energi band gap komposit ZnO/Graphene Oxide yaitu dari 3,03 eV; 2,90 eV dan 3,14 eV. Hasil ini menunjukkan bahwa pengaruh komposisi komposit ZnO/Graphene Oxide berpotensi sebagai katalis dalam aplikasi solar cell.
Effect of Variations of Cotton Fabric Dyeing on Chitosan-SiO2 Composite Solution on Hydrophobic Properties for Anti-Virus Mask Yuliani, Kurnia Dwi; Ratnawulan, -; Fauzi, Ahmad; Gusnedi, -; Jonuarti, Riri
PILLAR OF PHYSICS Vol 17, No 2 (2024)
Publisher : Department of Physics – Universitas Negeri Padang UNP

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.24036/13811171074

Abstract

The coronavirus Disease 2019 (Covid-19) has attracted worldwide attention since December 2019 and was declared a pandemic by the World Health Organization (WHO) on March 11. Covid-19 is believed to have originated in Wuhan, China, and has spread to more than 200 countries, every day the number of Covid-19 cases in the world continues to increase. One of the efforts to overcome Covid-19 is wearing a mask. This study aims to manufacture hydrophobic masks from cotton cloth that have antivirus properties from chitosan-SiO2 composite materials. This type of research is a laboratory experiment, Chitosan-SiO2 is used in the size of nanoparticles using a High Energy Milling (HEM) tool. Next, analyze the SiO2 content using X-Ray Fluorescence (XRF) and Infra Red Spectrophotometer (FTIR) to calculate the degree of deacetylation of chitosan. To analyze the crystal structure and crystal size using X-Ray Diffraction (XRD) and to determine the morphological structure of the Chitosan-SiO2 composite layer. The results of this study are hydrophobic masks derived from cotton cloth are anti-virus. The contact angles resulting from the variation of immersion are 122.4o, 130.914o, 134.563o, and 136.138o, while the contact angle without coating is 90o. The surface temperature produced from the Chitosan-SiO2 composite layer based on the temperature image pattern is 37.4oC, 39.9oC, 40.2o C, and 41.6oC. After washing the cotton fabric layer sample, contact angle melting occurs. The best variation of immersion against contact angles and antivirus tests characterized by surface temperature imagery patterns is 4 times dyeing with a contact angle of 136.138o reaching ultrahydrophobic angles and surface temperatures of 41.6oC.
PENGARUH UKURAN PARTIKEL ZnO TERHADAP STRUKTUR DAN SIFAT ELEKTRONIK NANOKOMPOSIT ZnO/GRAPHENE OXIDE SEBAGAI KANDIDAT KATALIS SOLAR CELL Yuliana, Yuli; Jonuarti, Riri; Jhora, Fadhila Ulfa; Hidayat, Rahmat
PHYDAGOGIC : Jurnal Fisika dan Pembelajarannya Vol 7 No 1 (2024): Phydagogic : Jurnal Fisika dan Pembelajarannya
Publisher : Universitas Sulawesi Barat

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.31605/phy.v7i1.4086

Abstract

Penelitian ini merupakan penelitian tentang pengaruh ukuran partikel ZnO terhadap struktur dan sifat elektronik. Tujuan dari penelitian ini adalah untuk mengetahui pengaruh ukuran pertikel ZnO terhadap struktur dan sifat elektronik. Jenis penelitian ini adalah eksperimental dengan menggunakan metode sol gel, dalam penelitian ini menggunakan beberapa instrumen, yakni XRD untuk melihat difraksi dari ZnO dan GO sehingga diperoleh data berupa fasa kristalin. Kedua SEM, untuk melihat morfologi permukaan dan ukuran partikel dan ketiga Spektrofotometer UV-Vis, digunakan untuk menganalisis absorbansi pada daerah UV-VIS. Proses sintesis pada penelitian ini dilakukan dengan metode ball milling untuk memvariasikan ukuran partikel ZnO,selanjutnya disintesis ZnO/GO dengan metode sol gel. Hasil penelitian yang diperoleh pada karakterisasi XRD adalah ukuran kristal terkecil yaitu pada sampel ZnO/GO 6 jam yaitu 142,56 nm dan ukuran terbesar didapatkan pada sampel ZnO/GO 4 jam yakni 171,31 nm. selanjutnya Dari pengukuran yang telah dilakukan, didapatkan nilai band gap dengan variasi ukuran partikel terbesar didapatkan pada sampel ZnO/GO yakni 3,16 eV dengan ukuran partikel 83 nm,sedangkan band gap terkecil didapatkan pada sampel ZnO/GO yakni 2,24 eV dengan ukuran partikel 69 nm. Dimana semakin kecil ukuran partikel yang dihasilkan maka semakin kecil juga nilai band gap yang dihasilkan sedangkan untuk daerah absorbsi yang dihasilkan semakin besar.
The Effect of Go Composition Variation on The Optical Properties of ZnO/GO Thin Films as a Candidate Material for Solar Cells Maharani, M; Jonuarti, Riri; Ratnawulan, R; Hidayat, Rahmat
PILLAR OF PHYSICS Vol 18, No 1 (2025)
Publisher : Department of Physics – Universitas Negeri Padang UNP

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.24036/16848171074

Abstract

This study aims to investigate the effect of Graphene Oxide (GO) composition variation on the optical and electronic properties of ZnO/GO thin films, which have potential as candidate materials for solar cells. The synthesis method employed is sol-gel, followed by the spin coating technique to produce thin films on glass substrates. Characterization was carried out using X-Ray Diffraction (XRD) to determine the crystalline structure, Scanning Electron Microscopy (SEM) for morphological analysis, and UV-Vis spectroscopy to measure optical properties, including light absorption and band gap.  The results indicate that a 3% GO composition significantly affects the optical and electronic properties of ZnO/GO. The addition of GO enhances light absorption in both the UV and visible ranges and reduces the band gap, contributing to improved energy conversion efficiency. Furthermore, SEM characterization shows a better particle distribution at 3% GO compared to other compositions, enhancing the interaction between ZnO and GO. Based on these findings, it can be concluded that a ZnO/GO combination with 3% GO has good potential as a material for solar cell applications. This research is expected to contribute to the development of more efficient and environmentally friendly renewable energy materials
Co-Authors AA Sudharmawan, AA Ambran Hartono Arni Sopianti Cahyaningrum, Wahyu Desti Yuspita Sari Fadhila Ulfa Jhora Fanny Rahmatina Rahim Fatni Mufit Fuad Sofaturahman Gusnedi Gusnedi Gusnedi, - Harman Amir Hidayati Hidayati Hidayati Hidayati Indri Saputri Pertama Intan Purnama Yani Kasih Syirpia Lia Rifka Septiana Maharani, M Maritza Syalsabilla Mira Syuriyani Nadia Raisa Aryani Rahmat Hidayat Rahmat Hidayat Raisa, Nadia Ramli Ramli Ratnawulan . Rifka, Lia Rita Iranie Sofaturrohman, Fuad Syalsabilla, Maritza Syuriyani, Mira Tika Rahmadani Wardatul Ullya Yenni Darvina Yulia Maulida Yuliana, Yuli Yuliani, Kurnia Dwi Yurnetti, Yurnetti