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All Journal Penelitian Pendidikan Jurnal Ilmu Dasar 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 Journal of Civil Engineering and Vocational Education Journal of Experimental and Applied Physics
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 Electrical & Electronics Engineering Energy Engineering Environmental Science Materials Science & Nanotechnology Mathematics Mechanical Engineering Physics Social Sciences Transportation Other

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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
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 : PHYDAGOGIC : Jurnal Fisika dan Pembelajarannya

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
Effect of Sorbitol and Chitosan Addition on Tensile Strength and Degradation Rate of Biodegradable Plastic from Rice Bran Starch Zahra, Hayatun Nufus; Jonuarti, Riri; Gusnedi, Gusnedi; Hidayat, Rahmat
CIVED Vol. 10 No. 3 (2023): September 2023
Publisher : Universitas Negeri Padang

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.24036/cived.v10i3.498

Abstract

The increasing use of plastic can cause enviromental pollution because plastic takes a very long time to decompose in the soil. Solutions that can be used to accelerate the process of plastic decomposition in the soil by replacing plastic making materials with natural polymer materials. Natural polymers are polymers produced from organic monomers, one of which is starch. Starch is one of the natural polymer materials used in the manufacture of biodegradable plastics, one of the natural materials containing starch is rice bran waste. From rice bran waste starch, bioderadable plastic can be made by adding chitosan and sorbitol by varying then succesively, namely 5:2:8, 5:3:7, 5:5:5, 5:7:3, 5:10:0, then making samples, then the samples are printed and tensile strength testing and degradation testing are carried out. From the tensile strength test results, the values obtained were 0.69 Mpa, 0.74 Mpa, 1.50 Mpa, 1.98 Mpa and 2.28 Mpa, respectively. The finel weight of the sampel after degradation is 0 gram, 0 gram, 0.0189 gram, 0.0226 gram, 0.1017 gram. It is concluded that biodegardable plastic with good tensile strength is in the variation of starch 5 grams, without sorbitol and chitosan 10 grams and for good degradation test in the variation of starch 5 grams, sorbitol 8 ml, chitosan 2 grams and variation of starch 5 grams, sorbitol 7 ml, chitosan 3 grams.
Effect of Polyvinyl Alcohol (PVA) Concentration and Stirring Time on The Mechanical Properties of Biodegradable Plastic from Kepok Banana Peel Starch Doni, Monica Anatasya; Jonuarti, Riri; Wulan, Ratna; Jhora, Fadhila Ulfa
CIVED Vol. 10 No. 3 (2023): September 2023
Publisher : Universitas Negeri Padang

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.24036/cived.v10i3.499

Abstract

One solution is to use bioplastics, which can replace synthetic plastics that are difficult to decompose. Starch is one of the materials used in the manufacture of bioplastics because it is naturally degradable. However, bioplastics made from starch tend to be brittle and easily damaged, so additional materials are needed to overcome this problem. Polyvinyl alcohol (PVA) is one of the materials used in the manufacture of bioplastics because it has properties that can be degraded naturally, is non-toxic, and is able to form good quality plastic films. This study aims to examine the effect of PVA concentration and stirring time on the mechanical properties of biodegradable plastic derived from kepok banana peels. This study used a completely randomized design with three variations of PVA concentration (3%, 4%, and 5%) and three variations of stirring time (25 minutes, 35 minutes, and 45 minutes). The results showed that at a PVA concentration of 5% with a stirring time of 45 minutes, bioplastics showed the best quality with a tensile strength value of 2.25 MPa, the best elongation at break was 416%, and the best elasticity was 0.541. In biodegradation, all samples were completely degraded within 7 days. It can be included that the addition of PVA concentration and the length of stirring effecth the mechanical properties of bioplastics but not on the biodegradation test.
Structure Analysis Of Fe3O4-Graphene Oxide Nanocomposite From Corn Cob Waste Ismira, Ismira; Hidayat, Rahmat; Ratnawulan, Ratnawulan; Jonuarti, Riri
Journal of Experimental and Applied Physics Vol 2 No 2 (2024): June Edition
Publisher : Department of Physics, Universitas Negeri Padang

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.24036/jeap.v2i2.59

Abstract

This research is a study of the structure of nanocomposites whose composition is varied between Fe3O4 and Graphene Oxide. The purpose of this study is to determine the structure of Fe3O4-Graphene Oxide nanocomposites from corn cob waste. This type of research is experimental research, which begins with sample preparation from corn cob waste, carbon activation, graphene oxide synthesis, sonication and neutralization of graphene oxide, and synthesis of Fe3O4-Graphene Oxide nanocomposites using the ball milling method by varying the composition. Crystal size and structure were characterized by XRD, functional groups were characterized by FTIR, surface morphology, particle size and porosity were characterized by SEM. The results of the research on the structure of Fe3O4-Graphene Oxide nanocomposites from corn cob waste, obtained XRD results show that the crystal structure is Hexagonal, Cubic, and Orthorhombic with the average crystal size of the best Fe3O4-Graphene Oxide composition variation at 30%: 70% composition, because the particle size produced is quite small from other composition variations, namely 39.19 nm. FTIR results show that all compositional variation comparisons have C-H, O-H, C≡C, C=O, C=C, C-O, and Fe-O bond functional groups. SEM results show the morphology of Fe3O4 is spherical, while the morphology of graphene oxide is in the form of chunks. The particle size value gets smaller as the Fe3O4 composition increases, because the more Fe3O4 composition causes the surface of the graphene oxide particles covered to get bigger. In addition, particle size can also affect the porosity of nanocomposites, the smaller particle size can increase porosity because more particles can occupy space.
Effect of The Camposition Nanocomposite Fe3O4-Graphene Oxide on Optical Properties Synthesized from Coconut Shell Charcoal Angraini, Sri; Gusnedi, Gusnedi; Jonuarti, Riri; Jhora, Fadhila Ulfa
Journal of Experimental and Applied Physics Vol 2 No 2 (2024): June Edition
Publisher : Department of Physics, Universitas Negeri Padang

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.24036/jeap.v2i2.60

Abstract

This study aims to determine the effect of Fe3O4 nanocomposite composition: Graphene Oxide on the optical properties of Fe3O4 Graphene Oxide nanocomposite by obtaining the results of absorbance value, transmittance, reflectance, and band gap value based on UV-Vis test. Graphene oxide used in this study is made from biomass waste coconut shell charcoal which contains carbon elements, most of whose pores are still covered by hydrocarbons and other organic compounds and the charcoal is used as activated carbon through an activation process, then synthesized using the modified hummers method. In this study, three variations were used, namely 20%: 80%; 30%; 70%; 40%: The results show that the effect of Fe3O4-Graphene Oxide Nanocomposite Composition on coconut shell waste using a UV-Vis spectrometer, the absorbance value of each sample was obtained in the range of 200-290 nm.. In the results of gap energy research with 3 variations respectively 3.269 eV, 3.79 eV, 3.91 eV obtained that if the variation of graphene oxide is higher than the value of the energy gap produced is smaller, so the addition of graphene oxide from coconut shell waste has the effect of reducing the energy gap of graphene oxide.
Effect of Calcination Temperature of SiO2-TiO2 Composite XRD Characterization of Crystal Size Structure and Phase Putri, Sri Fany Mulya; Ratnawulan, Ratnawulan; Gusnedi, Gusnedi; Jonuarti, Riri
Journal of Experimental and Applied Physics Vol 2 No 3 (2024): September Edition
Publisher : Department of Physics, Universitas Negeri Padang

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.24036/jeap.v2i3.65

Abstract

Calcination is often used to activate beneficial metal oxidation in catalysts and improve material stability. In the metal oxidation research used is SiO2-TiO2 nanocomposite because it has advantages over photocatalysts and thermal stability. One important factor that affects is the particle size and crystal phase formed during the calcination process at various temperatures. The purpose of the study was to determine the effect of calcination on changes in phase and crystal structure in SiO2-TiO2 nanocomposites. The material used for the manufacture of nanocomposites is natural silica source from coconut fiber which is burned into white ash. The ash was extracted for the preparation of silica sol by adding Tetraethyl Orthosilicate (TEOS) as a precursor synthesized by the sol gel method then, calcination was carried out with temperature variations of 700 , 800 , and 900 . After calcination, XRD characterization was carried out to obtain crystal sizes of 63.48 nm, 66.87 nm, and 73.83 nm. The phase formed is dominant in TiO2 is rutile and SiO2 is quartz and cristobalite.
Optical Characteristics Of Nano-Talc/TiO2 Thin Layer ; A Preliminary Study Vitrini, Nora; Jonuarti, Riri; Ratnawulan; Hidayat, Rahmat
Journal of Experimental and Applied Physics Vol 2 No 4 (2024): December Edition
Publisher : Department of Physics, Universitas Negeri Padang

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.24036/jeap.v2i4.81

Abstract

This study tested the effect of 50%:50% concentration nano-Talc/TiO2 on optical and photocatalytic properties thin layer activity. The goal is to understand how 50%:50% concentration affects absorption, reflection and transmission as as well as photocatalytic activity of thin layer. This research is experimental, starting with grinding Talc and TiO2, followed by dilution layer synthesis using the spin coat technique. Characterization includes cross-section morphology analysis using SEM, absorption, reflection, transmission and energy measurements slit with a UV-Vis DR spectroscope, as well as photocatalytic activity test. The research results show that the coating process managed to increase absorption by (92-98)% and energy band gap of 2.93 eV while reflection and transmission are reduced by (0.5-4)%, as well as the lowest rate of photocatalytic activity degradation rate of 0%, causing low ROS under light sunlight protective layer.
Co-Authors AA Sudharmawan, AA Afrilla, Sonya Ambran Hartono Angraini, Sri Arni Sopianti Azzahra, Zakia Cahyaningrum, Wahyu Desti Yuspita Sari Doni, Monica Anatasya Fadhila Ulfa Jhora Fanny Rahmatina Rahim Fatni Mufit Fuad Sofaturahman Gusnedi Gusnedi Gusnedi, - Hidayati Hidayati Hidayati Hidayati Intan Purnama Yani Ismira, Ismira Jhora, Fadhila Ulfa Jhora, Fadhilla Ulfa Kasih Syirpia Lia Rifka Septiana Maharani, M Maritza Syalsabilla Masni Yanti, Meri Melisa Putri Mira Syuriyani Nadia Raisa Aryani Nawiyah, Nawiyah Pertama, Indri Saputri Putri, Sri Fany Mulya Rahmadani, Tika Rahmat Hidayat Rahmat Hidayat Raisa, Nadia Ramli Ramli Ratna Wulan Ratnawulan Ratnawulan . Rifka, Lia Rita Iranie Salsabilla, Salsabilla Sofaturrohman, Fuad Syafika, Herma Syafri, Syafri Syalsabilla, Maritza Syuriyani, Mira Ulfa Jhora, Fadhila Ulfa Jhora, Fadila Vitrini, Nora Wardatul Ullya Yenni Darvina Yohandri Bow Yuliana, Yuli Yuliani, Kurnia Dwi Yulifarma, Rika Yuliza Noerman, Kiki Yurnetti, Yurnetti Zahra, Hayatun Nufus