Article Per Year (5 Year)
p-Index From 2021 - 2026
8.903
P-Index
This Author published in this journals
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

Published : 102 Documents Claim Missing Document
Claim Missing Document
Check
Articles

Found 102 Documents
Search

 7   8   9   10   11 
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.
The Analysis of Fe3O4/Graphene Oxide Magnetic Properties Synthesized from Corn Cobs Waste as A Potensial Material for Chemotherapy Agents Aziz, Abdul; Darvina, Yenni; Ratnawulan, 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.v2i4.85

Abstract

Cancer is a medical condition caused by mutations in cellular DNA that damage tissue cell function. The high prevalence of cancer in Indonesia needs to be observed with preventive treatments, one of them by applying nanomedicine for targeted drug delivery at cancer sites. It’s specifically will potential to increase the efficacy of treatment and reduce the side effects. Fe3O4/Graphene Oxide (GO) nanocomposite has been widely studied as an efficient nanocarrier drug delivery for chemotherapeutic agents. Therefore, it’s necessary to research the effect of using Fe3O4/GO as an alternative material in chemotherapy agent development. Variations in the composition of Fe3O4 and GO used can determine the ability of magnetic properties. This study aims to analyze the magnetic properties of Fe3O4/GO nanocomposites from corn cob waste by using the modified hummer method. The results of the study were identified using Vibrating Sample Magnetometer with composition variations of 20%:80%, 30%:70% and 40%:60%. Based on the hysteresis curve it was shown an increase in magnetic properties along with the amount of Fe3O4 in the mixture of Fe3O4/GO nanocomposite, with Saturation Magnetization (Ms) values of 18.2 emu/gram (20%: 80%), 23.2 emu/gram (30%:70%), and 31.1 emu/gram (40%:60%); Remanent Magnetization (Mr) values of 6.82 emu/gram (20%:80%), 8.86 emu/gram (30%:70%), and 12.3 emu/gram (40%:60%) and Intrinsic Coercivity (Hc) values of 0.0421 T (20%:80%), 0.0399 T (30%:70%), and 0.0424 (40%:60%). Based on these characteristics, this sample classified as superparamagnetic material, it can be used as an alternative material of nanocarrier drug delivery for chemotherapeutic agents.
Effect of SiO2/Chitosan Composition Variation on Functional Groups in Hydrophobic Cellulose Paper for Water/Oil Separation Almunazar, Fauziyah; Ratnawulan, Ratnawulan; Darvina, Yenni; Jhora, Fadhila
Journal of Experimental and Applied Physics Vol 3 No 1 (2025): March Edition
Publisher : Department of Physics, Universitas Negeri Padang

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.24036/jeap.v3i1.90

Abstract

The current research is conducted to study the effect of varying compositions of SiO2-Chitosan on the changes occurring in the functional groups available in cellulose paper that shows hydrophobic nature, which can be used for water and oil separation purposes. The composite layer studied is the silica-chitosan solution coated over the cellulose paper using the dip-coating method. Varying compositions of SiO2-chitosan studied are (0.6g:0.3g), and (0.3g:0.6g). Characterization by FTIR revealed the presence of the main functional groups, i.e., Si-O-Si, C-H, C-O, N-O, N-H, C-N, and O-H, with a range of 938-3784 cm⁻¹ strain. The identification of these functional groups attests to the incorporation of the SiO2-chitosan compound on the surface of the cellulose paper. This functionalization imparted a hydrophobic layer, as demonstrated by the capacity of each composition to cause the characteristic spectrum of the SiO2-chitosan compound. The results of this study confirm that the modification of SiO2-Kitosan composition has significant influences on the chemical properties and physical stability of the composite coating. This result explains the great potential of cellulose-based materials in water and oil separation technology. In addition, these results enable the development of sustainable materials with great efficiency in fluid separation applications.
Effect of Dipping Time of Filter Paper using SiO2-Chitosan Nanocomposite on Contact Angle for Water and Oil Separation Jasmine, Alifa; Ratnawulan, Ratnawulan; Darvina, Yenni; Hidayat, Rahmat
Journal of Experimental and Applied Physics Vol 3 No 1 (2025): March Edition
Publisher : Department of Physics, Universitas Negeri Padang

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.24036/jeap.v3i1.92

Abstract

The introduction of organic compound enriched wastewater into aquatic environments can cause a drop in dissolved oxygen, with significant consequences for microorganisms living in such environments. Ultimately, this problem jeopardizes the survival of higher trophic level animals in such environments. In recent times, new membrane technology development has received a lot of attraction, with membrane processes becoming increasingly utilized in oily wastewater separation processes. Membrane processes have proven effective in the removal of oils in water during such separation processes. An effective membrane for such a purpose is a silica composite membrane with a hydrophobic property, synthesized with a cellulose paper substrate and a silica of rice husks for use in creating an active membrane layer. In one part of a current investigation, dyeing duration impact was considered through changing immersion times for SiO2-chitosan nanocomposite coated filter paper for 5, 10, 15, and 20 minutes. In such a study, contact angles for 5, 10, 15, and 20-minutes' immersion times have been measured and documented at 94.35°, 98.53°, 101.04°, and 104.34°, respectively. In addition, an evaluation was performed to assess water and oil separation effectiveness with cellulose paper coated with SiO2/Chitosan composite, with efficiencies of 80%, 85%, 87.5%, and 90%, respectively, documented for such processes.
Pengaruh Variasi Jumlah Pencelupan Kertas Selulosa Hidrofobik pada Larutan Komposit SiO2-Kitosan-Grafena Terhadap Mikrosturktur Afrilla, Sonya; Ratnawulan, Ratnawulan; Jonuarti, Riri; Ulfa Jhora, Fadila
Jurnal Pendidikan Tambusai Vol. 8 No. 2 (2024)
Publisher : LPPM Universitas Pahlawan Tuanku Tambusai, Riau, Indonesia

Show Abstract | Download Original | Original Source | Check in Google Scholar

Abstract

Air dan minyak merupakan salah satu sumber bagi kehidupan. Namun, ada beberapa faktor penyebab terjadinya limbah berminyak, satu satunya limbah rumah tangga. Permasalahan ini perlu ditangani salah satunya dengan menggunakan membran yang dilapisi larutan komposit, larutan komposit yang dapat digunakan yaitu SiO2-kitosan-grafena. Penelitian ini dilakukan dengan metode Dip-Coating (pencelupan). Proses pencelupan dilakukan dengan beberapa variasi jumlah pencelupan diantaranya 1 kali, 3 kali, 5 kali, dan 7 kali. Pengujian kertas selulosa komposit dilakukan dengan alat karakterisasi XRD, hal ini bertujuan untuk melihat ukuran kristal dan lebar puncak. Hasil 1 kali pencelupan SiO2= 41,49 nm, kitosan= 41,56 nm, grafena= 32,85 nm, variasi 3 kali perendaman SiO2=41,43 nm, kitosan= 45,72 nm, grafena= 32,87 nm, variasi 5 kali pencelupan SiO2= 31,06 nm, kitosan= 34,38 nm, grafena= 32,85 nm, variasi 7 kali pencelupan SiO2= 31,06 nm, kitosan= 34,34, grafena= 37,55 nm
Analisis Variasi Suhu Pengeringan Kertas Komposit Silika-Grafena-Kitosan Terhadap Perubahan Ukuran Kristal Untuk Pemisahan Air dan Minyak Hardina, Yuli; Ratnawulan, Ratnawulan; Darvina, Yenni; Ulfa Jhora, Fadhilla
Jurnal Pendidikan Tambusai Vol. 8 No. 2 (2024)
Publisher : LPPM Universitas Pahlawan Tuanku Tambusai, Riau, Indonesia

Show Abstract | Download Original | Original Source | Check in Google Scholar

Abstract

Studi ini menyelidiki bagaimana perubahan suhu pengeringan berdampak pada perubahan ukuran kristal pada kertas komposit silika-grafena-kitosan yang digunakan untuk memisahkan air dan minyak. Salah satu masalah yang dihadapi adalah limbah berminyak yang mencemari sumber air. Untuk memaksimalkan hidrofobisitas komposit tanpa mengorbankan integritasnya, suhu pengeringan yang ideal dicari. Metodenya adalah sintesis larutan komposit silika-kitosan-grafena dengan sol-gel, pelapisan kertas selulosa menggunakan pencelupan, lalu pengeringan pada 60°C, 80°C, 100°C, dan 120°C selama 15 menit. Karakterisasi XRD dilakukan untuk mengamati perubahan ukuran kristal. Hasil menunjukkan ukuran kristal silika dan kitosan meningkat pada 80°C, menurun pada 100°C, lalu meningkat pada 120°C yang mengindikasikan rekristalisasi dan perubahan stabilitas termal. Ukuran kristal grafena meningkat pada 80°C, stabil pada 100°C, dan sedikit menurun pada 120°C yang menunjukkan ketahanan termal lebih baik. Suhu pengeringan optimal dapat menghasilkan ukuran kristal dan hidrofobisitas komposit yang ideal untuk pemisahan air dan minyak secara efisien.
Pengaruh Variasi Jumlah Doping Urea Terhadap Karakteristik Komposit ZnO/Graphene Oxide Sebagai Kandidat Katalis Solar Cell Yuliza Noerman, Kiki; Jonuarti, Riri; Gusnedi, Gusnedi; Ratnawulan, Ratnawulan; Ulfa Jhora, Fadhila
Jurnal Pendidikan Tambusai Vol. 8 No. 2 (2024)
Publisher : LPPM Universitas Pahlawan Tuanku Tambusai, Riau, Indonesia

Show Abstract | Download Original | Original Source | Check in Google Scholar

Abstract

ZnO dan Graphene Oxide merupakan material yang sangat menjanjikan dalam aplikasi solar cell. Kombinasi antara ZnO/Graphene Oxide memiliki kemampuan dalam mentranspor elektron dengan baik dibandingkan dengan ZnO atau Graphene Oxide saja. Namun, solar cell berbasis ZnO mudah terjadi rekombinasi pembawa muatan secara cepat karena energi band gap yang besar. Oleh karena itu, pembuatan komposit ZnO/Graphene Oxide yang diberi pengotor (doped) berupa urea dilakukan. Tujuan penelitian ini adalah untuk mengetahui pengaruh variasi jumlah doping urea pada komposit ZnO/Graphene Oxide terhadap karakteristik berupa struktur dan ukuran pada kristal dan partikel serta energi band gap yang nantinya akan dijadikan sebagai katalis solar cell. Tiga variasi jumlah doping yang diselidiki dalam penelitian ini: 0,11 gr, 0,22 gr, dan 0,33 gr dengan metode yang digunakan adalah metode sol-gel. Dari hasil analisis dapat dilihat bahwa dengan bertambahnya jumlah doping urea menunjukkan peningkatan pada ukuran partikel dari 107,86 nm menjadi 121,18 nm sedangkan pada ukuran kristal mengalami penurunan dari 46,39 nm menjadi 43 nm. Variasi jumlah doping urea juga mempengaruhi nilai energi band gap komposit ZnO/Graphene Oxide dengan nilai yang semakin menurun seiring bertambahnya jumlah doping yaitu dari 2,63 eV menjadi 2,57 eV, mengindikasikan peningkatan konduktivitas elektronik. Hasil ini menunjukkan bahwa komposit ZnO/Graphene Oxide dengan doping urea berpotensi sebagai katalis dalam aplikasi solar cell.
Pengaruh Variasi Konsentrasi SiO2-Grafena-Kitosan pada Kertas Selulosa terhadap Sifat Hidrofobik untuk Pemisahan Air dan Minyak Yanna, Fitri; Ratnawulan, Ratnawulan
Jurnal Pendidikan Tambusai Vol. 8 No. 2 (2024)
Publisher : LPPM Universitas Pahlawan Tuanku Tambusai, Riau, Indonesia

Show Abstract | Download Original | Original Source | Check in Google Scholar

Abstract

Penelitian ini bertujuan untuk mempelajari pengaruh variasi konsentrasi SiO2-Grafena-Kitosan pada kertas selulosa terhadap sifat hidrofobik untuk pemisahan air dan minyak. Untuk meningkatkan sifat hidrofobik dapat dilakukan modifikasi permukaan kertas dengan komposit SiO2-Grafena-Kitosan. Metode pelapisan yang digunakan adalah Dip-Coating. Pada penelitian ini variasi konsentrasi SiO2-Grafena-Kitosan yang digunakan yaitu: (60%:1%:39%), (50%:1,5%:48,5%), (40%:3%,%57%), dan (30%:4,5%:65,5%) %w/w. Sifat hidrofobik dapat ditentukan melalui pengukuran sudut kontak. Konsentrasi optimum diperoleh pada konsentrasi (30%:4,5%:65,5%) dengan sudut kontak yang didapatkan yaitu 97,030. Pada variasi konsentrasi 1, 2, dan 3 didapatkan sudut kontaknya adalah 96,250, 96,690 dan 96,910, sedangkan untuk uji efisiensi pemisahan air dan minyak didapatkan berturut-turut yaitu : 70%, 72,5%, 75%, dan 80%.
Pengaruh Jenis Bakteri Staphylococcus Aureus Dan Escherichia Coli Terhadap Hidrofobik & Self Healing Mortar Septia, Zahwa; Ratnawulan, Ratnawulan; Ulfa Jhora, Fadhila; Darvina, Yenni
Jurnal Pendidikan Tambusai Vol. 8 No. 2 (2024)
Publisher : LPPM Universitas Pahlawan Tuanku Tambusai, Riau, Indonesia

Show Abstract | Download Original | Original Source | Check in Google Scholar

Abstract

Penelitian ini mengeksplorasi pengaruh jenis bakteri, khususnya Staphylococcus aureus dan Escherichia coli, terhadap sifat hidrofobik dan kemampuan self-healing mortar. Metode eksperimental dilakukan dengan variasi jenis bakteri sebagai variabel bebas dan kontrol terhadap bahan baku dan suhu. Hasil analisis menunjukkan bahwa kedua jenis beton memiliki komposisi kimia yang serupa. Kuat tekan beton yang menggunakan Staphylococcus aureus sedikit lebih tinggi, demikian juga dengan sudut kontak permukaan, menunjukkan sifat hidrofobik yang lebih baik. Analisis SEM menunjukkan bahwa campuran kedua bakteri dapat mengurangi keretakan dan porositas beton, meningkatkan ketahanan terhadap air. Temuan ini mengindikasikan potensi penggunaan bakteri untuk memperbaiki mortar. Penelitian ini berkontribusi pada pengembangan mortar yang lebih tahan terhadap air dan memiliki kemampuan self-healing, dengan implikasi praktis dalam perpanjangan masa pakai bangunan dan pengurangan biaya perawatan.
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