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All Journal Jurnal Penelitian dan Pembelajaran Fisika Jurnal Pendidikan IPA Indonesia Gravity : Jurnal Ilmiah Penelitian dan Pembelajaran Fisika Science and Technology Indonesia JIPF (Jurnal Ilmu Pendidikan Fisika) Jurnal Penelitian Pendidikan IPA (JPPIPA) Momentum: Physics Education Journal JURNAL EKSAKTA PENDIDIKAN (JEP) JPF : JURNAL PENDIDIKAN FISIKA JURNAL PENDIDIKAN TAMBUSAI International Journal of Educational Dynamics (IJEDS) Eksakta : Berkala Ilmiah Bidang MIPA Jurnal Lentera Pendidikan Pusat Penelitian LPPM UM Metro JURNAL PENDIDIKAN MIPA Pelita Eksakta Jurnal Ilmiah Profesi Pendidikan Natural Science: Jurnal Penelitian Bidang IPA dan Pendidikan IPA Pillar of Physics Education : Jurnal Berkala Ilmiah Pendidikan Fisika Pillar of Physics: Jurnal Berkala Ilmiah Fisika Al-DYAS : Jurnal Inovasi dan Pengabdian kepada Masyarakat Journal of Innovative Physics Teaching (JIPT) Physics Learning and Education Jurnal Geologi dan Sumberdaya Mineral (Journal of Geology and Mineral Resources) Journal of Experimental and Applied Physics
Ratnawulan .
Departement Of Physics, Universitas Negeri Padang, Padang, 25132, Indonesia
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 Other

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Journal : Journal of Experimental and Applied Physics

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Synthesis of Hydroxyapatite From Egg Shells Using Precipitation Methods For Bone Implant Application Veni Wahyuni; Riri Jonuarti; Ratnawulan; Rahmat Hidayat
Journal of Experimental and Applied Physics Vol 1 No 2 (2023): September Edition
Publisher : Department of Physics, Universitas Negeri Padang

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.24036/jeap.v1i2.16

Abstract

Patients with fractures continue to increase from year to year. So that the need for biomaterials is very high and has had a considerable impact, especially in the field of orthopedic medicine. Hydroxyapatite (HAp) is one of the suitable biomaterials for bone implants. Hydroxyapatite (HAp) with the chemical formula C10(PO4)6O2H2 is a calcium phosphate that contains hydroxide, which is classified as a mineral in the apatite group. HAp can be obtained from natural waste such as the eggshells of a chicken. This is because chicken eggshells have a very high CaO content (98,43%) which serves as a precursor in the synthesis of HAp. The purpose of this research the aim of observing the effect of stirring time on the purity of the HAp produced and to see the optimum stirring time used to produce good HAp. In this study, HAp was synthesized using a precipitation method by varying the stirring time. Based on variations in stirring time of 1 hour, 2 hours, 3 hours, 4 hours, and 5 hours, the purity of HAp obtained was 15%, 49%, 66%, 82%, and 50%, respectively. Therefore, it was concluded that the optimal stirring time to produce HAp with the highest purity is at a time interval of 4 hours.
Effect of Carboxy Methyl Cellulose Addition with Glycerol Plasticizer on Physical Properties of Taro-based Biodegradable Plastics Urwatil Wuskha; Ratnawulan Ratnawulan; Gusnedi Gusnedi
Journal of Experimental and Applied Physics Vol 1 No 3 (2023): December Edition
Publisher : Department of Physics, Universitas Negeri Padang

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.24036/jeap.v1i3.28

Abstract

Widespread use of synthetic plastics that are not biodegradable and made from non-renewable petrochemical sources endangers the environment. Using biopolymers like starch, gluten, and guar gum to create biodegradable plastics is one way to reduce the use of synthetic plastics. One of the materials that can be used as biodegradable is taro starch. This study's goal was to ascertain how adding carboxymethyl cellulose (CMC) concentration affected the physical characteristics of taro-based biodegradable plastic. This sort of study is experimental, with the concentration of carboxymethyl cellulose (CMC) added as the independent variable and the mass of starch, glycerol plasticizer, distilled water, and sample thickness of 0.24 mm as the controls. Tests carried out include tensile strength and elongation tests as well as water resistance tests and tests of the ability of biodegradable plastics to degrade in soil. This study involved altering CMC by up to 15%, 20%, 25%, 30%, and 35% (w/w starch) while using up to 5 grams of taro starch as the mixing material and up to 3 ml of glycerol plasticizer as the plasticizer concentration. The test findings demonstrated that adding starch with a CMC concentration of up to 35% w/w had an impact on the plastic's tensile strength and elongation values. The percentage of weight loss of biodegradable polymers increases when CMC concentration is added, and the level of water resistance decreases when CMC concentration is added in amounts up to 35% w/w starch.
The Effect of Reflux Time from Natural Zeolite on Electrical Conductivity Fadli M; Gusnedi Gusnedi; Ratnawulan Ratnawulan; Riri Jonuarti
Journal of Experimental and Applied Physics Vol 1 No 3 (2023): December Edition
Publisher : Department of Physics, Universitas Negeri Padang

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.24036/jeap.v1i3.33

Abstract

This study aims to determine the electrical properties, namely the value of the electrical conductivity of natural zeolite. Natural zeolite was synthesized using the reflux method with NaOH as an activator with variations of 12, 24, and 36 hours with a molar concentration of 5 M NaOH. Tests were carried out using XRF characterization (X Ray fluorescence), XRD (X Ray Diffraction), and LCR Meter. The XRD results showed the highest peak value at 36 hours of 85.22 nm. The XRF results of the zeolite elements formed were 66.087% SiO2 and 8.45% Al2O3. And in the LCR Meter test, the highest conductivity value was obtained at 36 hours of reflux with a conductivity value of 5.5x10-2 S/m. The value of the electrical conductivity is directly proportional to the particle size where the greater the conductivity value the greater the particle size produced.The electrical conductivity results showed that zeolites are included in semiconductor materials and have the potential as supercapacitor electrodes
Effect of Variations in Mass Composition of TiO2/Activated Carbon Cassava Peel on Crystal Structure and Size Fauziyah, Faadhilah; Darvina, Yenni; Ratnawulan, Ratnawulan; Gusnedi, Gusnedi
Journal of Experimental and Applied Physics Vol 2 No 1 (2024): March Edition
Publisher : Department of Physics, Universitas Negeri Padang

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.24036/jeap.v2i1.45

Abstract

A battery is a tool used to store electrical energy to obtain electricity so that it can be used to power remotes, cellphones, laptops, cameras and other electronic items. The working indicator of a battery is capacity, its electrochemical cycling capability depends on the anode material. In general, battery anodes are made using graphite. However, graphite has limitations, namely that it can easily cause short circuits. Because graphite has limitations, a replacement for graphite from TiO2 nanocomposites with activated carbon will be made. Nanocomposites are new materials that are formed by combining two or more compounds to produce new properties and have nanoscale dimensions. TiO2 is used because it can reduce short cycles, has good stability, high current density and can increase battery performance capacity. Activated carbon is used to expand the surface of the material to obtain a large capacitance. The activated carbon used in this article is cassava peel from unused waste in order to reduce environmental pollution and increase the economic value of the waste. The aim of this research is to produce TiO2/Activated Carbon nanocomposites to test their crystal structure and size using XRD. TiO2/Activated carbon nanocomposites were obtained using the sol-gel method. Variations in the mass composition of TiO2/Activated Carbon used are 40%:60%, 50%;50%, and 60%:40%. Based on the tests that have been carried out, the smallest crystal size was obtained with a variation of 40%:60%, namely 58.4 nm with a Tetragonal structure for TiO2 while Cubic and Rhombohedral for carbon.
Effect of Tetraethoxysilane Addition to Coconut Coir Ash Nanosilica on Morphology and Particle Size of SiO2-TiO2 Nanocomposite Triana Dwi Restika; Ratnawulan, Ratnawulan
Journal of Experimental and Applied Physics Vol 2 No 1 (2024): March Edition
Publisher : Department of Physics, Universitas Negeri Padang

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.24036/jeap.v2i1.48

Abstract

Nanotechnology is not possible without nano-sized materials. Nanomaterials can be used to produce composites that can be used in various fields, including in industry as fabric coating materials by providing certain properties to fabrics, one of which is water repellent properties. By adjusting the shape and size of the microscopic elements that comprise the nanocomposite, these water-repellent characteristics may be changed, changing the surface morphology, and interacting with the particles through the incorporation of two or more materials. Therefore, the goal of this research is to ascertain how the effect of tetraethoxysilane as a co-precussor SiO2 and as coupling agent on the SiO2-TiO2 nanocomposite layer. This type of research is experimental. Starting with the grinding of coconut fiber ash using HEM-E3D, the experiment continued with the extraction of silica using the sol-gel method and checking its composition with XRF. Next, the prepared nanocomposites were applied to the fabric. Furthermore, the nanocomposites were characterized by SEM and contact angle testing was conducted. The results of this study show that nanocomposites have better properties than their constituent particles. With the variation of adding 7 milliliters of tetraethoxysilane, the smallest particle size reaches 51 nm, and produces the best contact angle of 148°.
Effect of Fe3O4 Nanoparticle and Graphene Oxide Compositions on The Magnetic Properties of Fe3O4 : Graphene Oxide Nanocomposites Ramadhani, Dinda; Hidayat, Rahmat; Ratnawulan, Ratnawulan; Darvina, Yenni
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.v2i2.50

Abstract

Magnetic material research aims to determine the effect of variations in the addition of Fe3O4 nanoparticles to graphene oxide. Graphene oxide made from coconut shell waste was synthesized using the modified hummers method and composited with Fe3O4 nanoparticles consisting of three composition variations, which are 20%:80%, 30%:70% and 40%:60%. The Fe3O4-Graphene Oxide nanocomposite was tested using three characterization tools, namely XRD, FTIR and VSM. Testing using XRD and FTIR was carried out to determine whether the Fe3O4-Graphene Oxide nanocomposite had been formed or not. In XRD testing, a crystal size of 39.57 nm was obtained, which means that this research has succeeded in forming nanocomposites where the size obtained is smaller than 100 nm. In FTIR testing, it can also be seen that this research has succeeded in forming Fe3O4-Graphene Oxide nanocomposites as seen from the functional groups obtained, which consist of oxygen, hydrogen, carbon and iron. In testing using VSM, it can be seen how the effect of adding Fe3O4 to graphene oxide, where the greater the addition of Fe3O4 composition, the greater the value of the coercivity field produced. In addition, the addition of Fe3O4 causes an increase in the magnetic properties of remanent magnetic, saturation magnetic  and coercivity values. The coercivity values are 371.18 Oe, 387.59 Oe and 405.19 Oe, respectively, where the highest coercivity value is found in the 40% variation: 60%. This hail shows that the nanocomposite produced is ferromagnetic and classified as a hard magnet so that it can be applied as HDD.
Analysis of the Influence Mass Variations of Banana STEM Fibres with Polypropylene (PP) Matrix on Accoustic and Porosity Properties Santika, Viera Alvio; Darvina, Yenni; Ratnawulan, Ratnawulan; 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.v2i2.54

Abstract

Noise pollution is sound that you do not want to hear or is known as noise. If people hears loud noises continuously, it can disrupt hearing function. Therefore, it is necessary to have noise control by making an acoustic material that will be coated on the room's walls. A cheap and environmentally friendly alternative material is using banana stem waste from the fibre taken and with polypropylene as a fibre binder. This research aims to determine the effect of variations in the mass composition of banana stem fibre with the matrix polypropylene on the value of the acoustic properties and porosity, and determine the relationship between porosity with acoustic properties. Characteristics of the acoustics that will be measured are sound absorption coefficient, sound reflection coefficient, and transmission loss. The method used is using a characterizaton tool with one microphone impedance tube and porosity test tool with a digital scale. Acoustic material is made by varying the mass percentage in the ratio of polypropylene and midrib fibre banana, namely 90%:10%; 85%:15%; 80%:20%; 75%:25%; and 70%:30%. Based on the research results, it is known that the more fibre composition in the composite, the sound absorption coefficient values, transmission loss values, and porosity values were higher produced, but the resulting sound reflection coefficient value was lower. Then, the relationship between porosity with acoustic properties was that the higher porosity value, the resulting sound absorption coefficient and transmission loss value are higher too. However, the resulting sound reflection coefficient value was getting lower.
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 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.
Microwave Absorption Properties of Fe3O4/Graphene Oxide Nanocomposites Synthesized from Coconut Shell Waste Syahputra , Ilham; Darvina, Yenni; Ratnawulan, Ratnawulan; Hidayat, Rahmat
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.v2i3.69

Abstract

Electromagnetic wave absorption technology is one of the technologies that need to be developed to control the problems caused by Electromagnetic Interference (EMI). This technology has created a material called Radar Absorbing Material (RAM) that Making RAM can be formed with material modifications such as nanocomposite materials. The manufacture of Fe3O4 nanocomposites and Graphene Oxide (GO) synthesized from coconut shell waste is one of the studies that need to be studied and developed at this time. Variations in the composition of Fe3O4 and GO used can determine the ability of microwave absorption. This study aims to analyze the microwave absorbing properties of Fe3O4/GO nanocomposites from coconut shell waste. The materials used to make this nanocomposite are magnetite (Fe3O4) and GO synthesized from coconut shell waste. This research uses experimental methods, with variations in the composition ratio between Fe3O4 and GO, namely 20% Fe3O4: 80% GO, 30% Fe3O4: 70% GO, and 40% Fe3O4: 60% GO. Characterization was carried out using a Vector Network Analyzer (VNA) to determine the nature of microwave absorption. The VNA characterization results found the influence of variations between Fe3O4 and GO composites. Based on the research results, the lowest absorption coefficient percentage was 95.50% at a frequency of 8.38 GHz for the composition variation of 20% Fe3O4 and 80% GO. The highest absorption coefficient was 96.43% at a frequency of 8.42 GHz for the composition of 40% Fe3O4 and 60% GO. The addition of Fe3O4 can make the absorption value of the material to microwaves higher.
Co-Authors - Hamdi AA Sudharmawan, AA Abdul Aziz Adilla, Rika Afrilla, Sonya Ahmad Fauzi Ahmad Fauzi aisyah fadillah Akmam Akmam Al Naim, A. F. Almunazar, Fauziyah Amelia Roza Haqu Amirullah, Fajar Fikri Anisa Janna Anisa Surya Annisa Kurniawati Aprianti, Rika Aria Ulfa Aris Alfikri Arni Sopianti Asri Devialita Asrizal - Betty Mizarwan Bizar al furqan Dafri Zaldi Dani Gustaman Syarif Delianis Pringgenis Desnita Desti Yuspita Sari Deswita, Pipi Devana Dhiya Purnama Sari, Salsabila Dian Septiana Dila Juliawati Djusmaini Djamas Doni, Rahma Dwi Putri Ramadhani Elvira Diana. S Emiliannur Emiliannur Ernita Susanti Ernmaniati Ramli Fadhila Ulfa Jhora Fadli M Fanny Rahmatina Rahim Faridah Lisa Supian Fatni Mufit Fauzi Ahmad Muda Fauziyah, Faadhilah Febriona, Fhica Febriya, Dhea Fitri, Hidayatul Forni, Francesca Fran Surya Andi Fuad Sofaturahman Gusnedi Gusnedi Gusnedi Gusnedi Gusnedi Gusnedi Gusnedi, - Gusriandi, Dedi Gustaman Syarif Gusti, Dian Arima Gustika Yonanda Hamdi Rifai Hardina, Yuli Harman Amir Hayyu Yumna Hidayat, Zaitul Hidayati Hidayati Hidayati Hidayati Hidayatul Lisma, Rahmi Hosman, N. J. Hufri Hufri I Made Arnawa Idam Arif Ilahi, Fitratul Intan Purnama Yani Ipal Ipal Irna Humairah Ismira, Ismira Izzati Salsabilla Madina Jasmine, Alifa Jhora, Fadhila Jhora, Fadhila Ulfa Kharisma Marta Judenta Korry Nilyani Lailatul Rahmi Lathifa Zonesya Putri Letmi Dwiridal Letmi Dwiridal Lia Rifka Septiana M. Bayu Ihsan Maharani Erika Putri Maharani, M Maritza Syalsabilla Masril Masril Mayasari, Tantri Mira Syuriyani Mohd Azmi, M. S. Muhammad Ridwan Azizi Mutiara Kusuma Febriwanti nabila aulia rahma Nadia Raisa Aryani Nadiyyah, Khoirotun Najmiatul Fajri Naspin, Desi Ariyanti Nessa Aqila Novella Febriana Nur Azizah Nurhabibah Nasution Nurhayati Nurhayati PAT, Anggi Angelina PAT Angelina Putri Dwi Sundari Putri, Sri Fany Mulya Rahima Syabrina Sarmi Rahmad Efendi Rahmat Hidayat Rahmat Hidayat Rahmat Hidayat Raisa, Nadia Ramadhani, Dinda Ramli Ramli Renol Afrizon Renold Fernanda Retna Junia Rifka, Lia Riri Camara Putri Riri Jonuarti Riri Jonuarti Riri Yandari Rita Iranie Riyasni, Selma rizka fauziah Rizki Fernanda Rosa Ayuni Utami Rosi Selfia Putri Santika, Viera Alvio Saputri, Ririn Hustia Sarimai Sarimai Sarmi, Rahima Syabrina Septia, Zahwa Silvi Yulia Sari Sinthia Dwi Jayanti Sisi Gusti Putri Sofaturrohman, Fuad Suherman, Dea Stivani Sumanti, Syahputri Supian, F. L. Syafri Syafri Syafriani Syafriani Syafriani Syafriani, - Syahputra , Ilham Syakbaniah Syakbaniah Syalsabilla, Maritza Syuriyani, Mira Tho, S. W. Triana Dwi Restika Trisia Meidini, Ella Ulfa Jhora, Fadhila Ulfa Jhora, Fadhilla Ulfa Jhora, Fadila Urwatil Wuskha Usmeldi Usmeldi Vauzia, Vauzia Veni Wahyuni Vonny Tinedi Wardatul Ullya Widiasih, Widiasih Witriani Marvinatur Ihsan Wong, Y. Y. Yanna, Fitri Yedho Syahadha Yenni Darvina Yola sri Wahyuni Yuliani, Kurnia Dwi Yulianti, Lastri Yuliza Noerman, Kiki Yulkifli Yulkifli Yurnetti Yurnetti Zaitul Hidayat Zakirman Zaturrahmi Zaturrahmi Zoni, Muhammad Ari Zulhendra Zulhendra Zulhendri Kamus