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All Journal BERKALA FISIKA Sainstek SEMIRATA 2015 Jurnal Penelitian Pendidikan IPA (JPPIPA) Jurnal Ilmiah Pendidikan Fisika Spektra: Jurnal Fisika dan Aplikasinya JURNAL EKSAKTA PENDIDIKAN (JEP) JURNAL PENDIDIKAN TAMBUSAI Jurnal Teori dan Aplikasi Fisika Abdi Dosen : Jurnal Pengabdian Pada Masyarakat Pelita Eksakta Abdi: Jurnal Pengabdian dan Pemberdayaan Masyarakat Jurnal Humanities Pengabdian Kepada Masyarakat Jurnal Ilmiah Profesi Pendidikan Pillar of Physics Education : Jurnal Berkala Ilmiah Pendidikan Fisika Pillar of Physics: Jurnal Berkala Ilmiah Fisika Journal of Comprehensive Science MASALIQ: Jurnal Pendidikan dan Sains Journal of Innovative Physics Teaching (JIPT) Journal of Climate Change Society Physics Learning and Education Journal of Experimental and Applied Physics
Yenni Darvina
Universias Negeri Padang
Religion Aerospace Engineering Agriculture, Biological Sciences & Forestry Humanities Astronomy Biochemistry, Genetics & Molecular Biology Chemical Engineering, Chemistry & Bioengineering Chemistry Computer Science & IT Control & Systems Engineering Earth & Planetary Sciences Economics, Econometrics & Finance Education Electrical & Electronics Engineering Energy Environmental Science Health Professions Languange, Linguistic, Communication & Media Library & Information Science Materials Science & Nanotechnology Mathematics Medicine & Pharmacology Physics Public Health Social Sciences Other

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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.
Impedance Tube Method Based On Arduino For Material Acoustic Measurement Anwar, Suci; Yohandri, Yohandri; Darvina, Yenni; Yulkifli, Yulkifli
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.v3i1.89

Abstract

Acoustics play a crucial role in advancing technology and industry by mitigating moise, which is an uwanted byproduct of many devices. However, existing tools for testing acoustic properties often lack automation and calibration, which limits their realibility and usability. This study introduces the development of a test device designed to measure the sound absorption coefficient of materials using the two-microphone impedance tube method. The device incorporates a PVC tube, an Arduino Nano Microcontroller, and an OLED display for real-time data analysis and visualization. The proposed device offers simplicity, portability, and improved measurement accuracy compared to existing solutions. The method involves measuring sound intensity and absorption coefficients using direct dan indirect techniques. Experimentals results demonstrate that the device achieves an average accuracy rate of 20.38%, with consistent absorption coefficient values across repeated tests. The frequency range tested aligns with the performance limits of the device, further confirming its reliability. In conclusion, the developed device provides a practical and reliable solution for testing acoustic materials, addressing the limitations of previous methods.
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.
Analysis of Raw Natural Montmorillonite (MMT) from Marapi Volcanic Ash and Its Potential as an Adsorbent Nawiyah, Nawiyah; Jonuarti, Riri; Darvina, Yenni; Hidayat, Rahmat; Syafri, Syafri
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.v3i1.95

Abstract

Volcanic ash consists of fine particles that are ejected into the atmosphere during an eruption of a volcano. The volcanic ash that will be tested in this study comes from the Aia Angek area of West Sumatra, which erupted in December 2023 to February 2024. The goal of this research was to assess the quantity of montmorillonite found in the volcanic ash originating from Marapi. In order to reach this objective, various examinations were conducted for characterization utilizing XRF, XRD, FTIR and SEM. The XRF data results show that the largest montmorillonite elements in volcanic ash are SiO2 dan Al2O3. The XRD test results show that there are 6 types of montmorillonite contained in Marapi volcanic ash, namely Chlorite-vermiculite-montmorillonite, Montmorillonite (Clay), Illite-Montmorillonite regular, Monmorillonite, Montmorillonite 15-A and Montmorillonite heated. The FTIR test results show that the peak band 3669-467/cm contains the chemical composition of montmorillonite. Based on the SEM test analysis, it shows the morphology of montmorillonite from Marapi volcanic ash with a particle size of 301,9 nm and a porosity size of 151,6 nm. Thus, based on the results of the five characterizations carried out, it is known that the Marapi volcanic ash does contain complex montmorillonite.
Validity And Practicality of PjBL-Based Teaching Materials Environmental Pollution For Physics Phase E Rahmadini, Fadhilla; Darvina, Yenni; Gusnedi, Gusnedi; Yulia Sari, Silvi
Jurnal Pendidikan Tambusai Vol. 8 No. 1 (2024): April 2024
Publisher : LPPM Universitas Pahlawan Tuanku Tambusai, Riau, Indonesia

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.31004/jptam.v8i1.13528

Abstract

The purpose of this research is to test the validity and practicality of the project-based learning teaching materials that have been developed.. This research is research and development (R&D) with a model-4D development model. Data analysis uses Aiken V. The results of the validity test, gets a score was 0.89846 with valid criteria. Meanwhile, the results of the practicality test by 3 physics teachers obtained an average overall score of 93.25% using practical criteria, and the results of the practicality test by 19 students obtained an average overall score of 88.28% using practical criteria, so it can be concluded that the environmental pollution teaching materials for phase E project-based learning that have been developed have met the validity and practicality requirements and are suitable for use by teachers in teaching and for students in learning.
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

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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.
Analisis Pengaruh Variasi Massa Serat Pelepah Pisang Dengan Matrik Polypropylene (PP) Terhadap Konduktivitas Termal Dan Porositas Panel Komposit Afrizal, Afrizal; Darvina, Yenni; Amir, Harman; Hidayat, Rahmat
Jurnal Pendidikan Tambusai Vol. 8 No. 2 (2024)
Publisher : LPPM Universitas Pahlawan Tuanku Tambusai, Riau, Indonesia

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Abstract

Pemanasan global menyebabkan suhu di dalam bangunan tempat tinggal meningkat, yang dapat mengurangi kenyamanan penghuni rumah. Peningkatan suhu dalam ruangan disebabkan oleh faktor-faktor seperti kurangnya sirkulasi udara yang memadai dan penyerapan panas dari matahari oleh dinding serta atap bangunan. Jenis material yang digunakan pada permukaan bangunan sangat mempengaruhi perpindahan panas. Solusi dari permasalahan ini adalah dengan menggunakan papan insulasi panas yang dapat menghambat aliran panas dari luar ke dalam ruangan. Komposit yang terbuat dari serat pelepah pisang dan polypropylene sebagai matriks adalah alternatif yang ekonomis dan ramah lingkungan. Penelitian ini bertujuan untuk mengkaji pengaruh variasi massa polypropylene dan massa serat pelepah pisang terhadap konduktivitas termal serta porositas panel komposit, dan untuk memahami hubungan antara porositas dan konduktivitas termal panel komposit. Panel komposit dibuat dengan berbagai perbandingan massa polypropylene dan serat pelepah pisang, yaitu: variasi 1 (100%:0%), variasi 2 (90%:10%), variasi 3 (85%:15%), variasi 4 (80%:20%), variasi 5 (75%:25%), dan variasi 6 (70%:30%). Pengujian yang dilakukan mencakup konduktivitas termal menggunakan alat thermal conductivity apparatus dan porositas. Penelitian sebelumnya menunjukkan bahwa variasi dengan persentase polypropylene dan serat pelepah pisang 80%:20%, 75%:25%, dan 70%:30% memiliki nilai konduktivitas termal 0,0978 W/m°C, 0,0894 W/m°C, dan 0,0778 W/m°C, yang semuanya kurang dari 0,1 W/m°C, menjadikannya bahan isolator panas yang baik. Selain itu, semua variasi memiliki nilai porositas antara 1,09% hingga 1,7461%, yang kurang dari 25%, sehingga termasuk dalam kategori bahan non-pori. Hasil penelitian menunjukkan bahwa peningkatan massa serat dan penurunan massa matriks polypropylene, nilai konduktivitas termal menurun dan porositas meningkat. Dengan meningkatnya porositas, konduktivitas termal cenderung menurun.
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

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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.
Pengaruh Variasi Ukuran Partikel ZnO terhadap Morfologi Permukaan dan Sifat Optik pada Lapisan Tipis ZnO-GO Pertama, Indri Saputri; Jonuarti, Riri; Darvina, Yenni; Jhora, Fadhilla Ulfa
Jurnal Pendidikan Tambusai Vol. 8 No. 2 (2024)
Publisher : LPPM Universitas Pahlawan Tuanku Tambusai, Riau, Indonesia

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Abstract

Abstract
Co-Authors - Afrizal - Rahmi - Ramli - Ramli - Syakbaniah - Yulkifli - Yulkifli Abdul Azis Abdul Aziz Ade Aprilia Ade Usra Berli Afdatul Zikri Ahmad Fauzi Aifah Fauziah Akmam Akmam Alif Yulanda Putri Almunazar, Fauziyah Alqadri, Dheo Alwi Nofriandi Amali Putra Ambran Hartono amira tiara wulandari Andari Oktafiani Anisa Meysi Wardi Annisa Febriani, Annisa Anofa Liona Anwar, Suci Aprilia Cahaya Ari Arfandi arifaldi arifaldi Asfaha, Auzha Hira Asrad Hafizah Asrizal Asrizal Asrizal Atika Dwi Maharani Zuler Audia, Washilla Aulia, Mhd Reyfanza Aulia Azca Aryadiva Mahengga Azura Carolina Harsani Azzahra, Zakia Bella Salsa Bella Sukma Putri Chairunnas Chairunnas Cici Ramayanti Dara Putri Pratama Desnita Desra Yarsina Dicko Maulana Syahdan Diffa Azilia Dila Alhumaira Dola Afriyenti Edi Sanjaya Elsa Imelda Elsa Okta Memori Elsa Rahmayuni everly aberta Fadhila Ulfa Jhora Fadilla Septiani Fadillah Ulfah Fakhrur Rhozy Fani, Meylin Sir Fanny Rahmatina Rahim Fatni Mufit Fatni Mutfit Fauziyah, Faadhilah Febrian Syah Febrian, Nanda Festiyed Fio Adella Illahi Firda Annisa Fitrah Ayu fitri rahmi Fitria Murti Fran Surya Andi Fredy Pratama Frima Suci Agustia Fuja Novitra Gina Fadilah NST Gusnedi Gusnedi Gusnedi Gusnedi Gusnedi, - Gustika Yonanda Hamdi Rifai Hardina, Yuli Harman Amir Hasya Syahmi Hazrati Ashel Hersha Hanifa Hidayati Hidayati Hidayati Hidayati Hidayati Hidayati Hifzi, Zudiya Hilmi Rizki Anjani Hrp, Abdul Maulub Hufri Hufri Ihsania Ikrima Kinanti Ilahi, Fitratul Indah Safira Indah Septia Ningsih Indah Tri Handini Indri Syukra Innes Andriani Iryani Iryani Ismathul Dinny Jasmine, Alifa Jhora, Fadhila Jhora, Fadhila Ulfa Jhora, Fadhilla Ulfa Kasih Syirpia Khairunnisa Khairunnisa Kuwat Triyana Lestra, Dila Ayu Letmi Dwiridal Lidya Agraini Lucya Sinurat Lusi Oktavia Masril Masril Masril Masril Masril Masril Masril Masril masril masril Melani Alvino Miftahurrahmah Miftahurrahmah, Miftahurrahmah Muhammad Ikmal Muhammad Rivai Murtiani Murtiani Murtiani Murtiani Mustika, Dian Putri mutia faizah apriani Mutia Risma Mutia Yussavel Navis Nabila, Aliya Nadia Ardianti Nadia Ramadhanty Nadila Putri Bungsu Nadya Aztifa Nadya Yunestika Nawiyah, Nawiyah Nazifah, Naurah Nia Nursurila Nidya Yulfriska Nidya Yulfriska Novelia Prima Nur Anisa Nur Sahfitri Nurhasanah Nurhasanah Nurhijjah Tiur S Nurmala Sari Lubis Oktavia, Vini Onny Gustira Pakhrur Razi Pertama, Indri Saputri Pratama, Rayvol Dion Pratiwi Mailisa Prima Nora Ananda Puput Mulya Sari Pusri Mela Putra Adil Putra, Amali Putri Diana Putri Dwi Sundari Putri Rasti Ramadhani Radha Firaina Rahma Tilla Dwi Lestari Rahma Yeni Rahmadini, Fadhilla Rahmat Hidayat Rahmat Hidayat Rahmi Zulva Ramadhani, Dinda Ramli Ramli Ramli Ramli Ramli Ramli Ramli Ramli Ramli Ramli Ramli Ramli, - Rara Nur Rida M.Y Ratnawulan . Renol Afrizon Resti Novela Retna Junia Revi Febrina Sari Ria Monica Rifi Wasrika Rima Melani Putri Rio Anshari Riolin Putri Artiwi Riri Jonuarti Riri Raihannil Jannah Riyasni, Selma rizka fauziah Rizki Rizki Romizah Marta Salma Amalia As Shidiq Santika, Viera Alvio Sari, Mona Berlian Septia, Zahwa Setivawani, Andrisa Shinta Kumala Silmi Hidayatullah03 Silvi Trisna Silvi Yulia Sari Siti Riva Darwata Slivi Yulia Sari Solly Aryza Sonia Nur Riza Sovia Yulianti Srisa Oktaweri Suci Wahyuni Suherman, Dea Stivani Suryani Fadhilah Syafri, Syafri Syafriani - - Syafriani Syafriani Syafriani Syafriani Syafriani Syafriani Syafrinaldi Syafrinaldi Syahputra , Ilham Syair Nandi Tiwi Novalia Syahari Tri Agunaisy Tria Sukma Sandi Trio Junira Fernando Ulfa Jhora, Fadhila Ulfa Jhora, Fadhilla Ully Nuraidina Ummiatul Fitri Vanessa Febta Sindani Varadila Sahanaya wahyu dilla abdullah Wahyudil Hayat wahyuni hafnisyah Wahyuni Satria Dewi Widara, Rofifah Windri Suci Gaitari Yeni Mustika Sari Yogi Putra Yohandri Yohandri Bow Yolvi Oktaviani Yona Sri Mantia Yosi Febriani Yudha, Fauzan Syafril Yulhendri Yulhendri Yulia Febrina Yulia Sari, Silvi Yulkifi Yulkifi Yulkifli Yulkifli Yulkifli Yulkifli Yulkifli Yulkifli, Y Yunita Ela Saputri Yuri Yanti Yurnetti Yurnetti Yurnetti Yurnetti Yurnetti, Yurnetti Zakiya, Zara Zara Zakiya Zoni, Muhammad Ari Zulhendri Kamus Zulma, Degito