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All Journal Jurnal Penelitian Sains Makara Journal of Science Schrödinger: Journal of Physics Education
Rodhiyah, Marathur
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Effect of Varying Chitosan Molecular Weights on the Morphology and Physical Characteristics of PVA/Chitosan Composite Hydrogels Sihombing, Yuan Alfinsyah; Luthfianti, Halida Rahmi; Waresindo, William Xaveriano; Rodhiyah, Marathur; Nafisah, Nur’aini; Hapidin, Dian Ahmad; Edikresnha, Dhewa; Khairurrijal, Khairurrijal
Makara Journal of Science Vol. 29, No. 3
Publisher : UI Scholars Hub

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

Abstract

We employed the innovative freeze–thaw method to investigate the effect of chitosan (CS) molecular weights incorporated into polyvinyl alcohol on the morphology and physical characteristics of the hydrogel. This study aimed to unravel the intricate relationships between CS molecular weight variations, CS concentration, and the number of freeze–thaw cycles (4 or 6 cycles) on hydrogel swelling degree and weight loss. Incorporating CS improved the hydrogel structure and enhanced its porosity, resulting in remarkable increases in swelling degree ranging from 2 to 6 times the initial weight. Higher molecular weight CS (310,000–375,000 Da) exhibited a lower swelling degree than medium molecular weight CS (190,000–310,000 Da), attributed to its ability to prevent crystal formation during the freeze–thaw process. Increased freeze–thaw cycles led to a decreased swelling degree, which indicated enhanced rigidity and stability due to more significant hydrogen bond formation with hydroxyl groups. Higher CS content amplified hydrogel weight loss, and additional cycles accentuated this effect, highlighting the challenge of maintaining an effective gel structure. CS with medium molecular weight emerged as the more suitable choice for applications demanding superior water absorption.
Review: Potensi Hidrogel Selulosa sebagai Media Enkapsulasi Senyawa Bioaktif Rodhiyah, Marathur; Naufal, Muhammad Risyad; Cahyati, Nilam; Nur'aini, Siti; Arandi, Tyas Al
Jurnal Penelitian Sains Vol 27, No 3 (2025)
Publisher : Faculty of Mathtmatics and Natural Sciences

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.56064/jps.v27i3.1289

Abstract

Hidrogel merupakan polimer struktur tiga dimensi yang memiliki kemampuan menyerap cairan. Hidrogel dapat dibuat menggunakan polimer sintetis seperti selulosa. Penggunaan selulosa tersebut didasarkan pada kelimpahan kandungannya pada berbagai tanaman yang ada di Indonesia. Proses pembuatan hidrogel dilakukan dengan menggunakan ikat silang fisika. Hidrogel yang dihasilkan menunjukkan karakteristik yang baik, meliputi nilai derajat pengembangan, kekuatan mekanik, dan biokompatibilitas. Namun, kekurangannya adalah hidrogel belum bisa dimanfaatkan secara optimal dalam bidang biomedis karena kurangnya aktivitas antibakteri yang memadai. Salah satu aplikasi biomedis yang menjadi perhatian adalah aplikasi penutup luka. Hal tersebut berkaitan dengan banyaknya kasus infeksi luka yang terjadi. Sehingga jika ingin digunakan sebagai aplikasi penutup luka, maka pada matrik hidrogel perlu ditambahkan senyawa bioaktif dari bahan alam. Ekstrak bahan alam yang digunakan harus memiliki kandungan senyawa bioaktif yang memiliki aktivitas antibakteri, antioksidan, dan anti inflamasi. Paper review ini menganalisis beberapa kandidat sumber senyawa bioaktif. Ekstrak biji mangga dapat dijadikan sebagai kandidat karena memiliki sifat-sifat tersebut. Selain itu pemilihan ekstrak biji mangga juga didasarkan pada keberlimpahannya di Indonesia. Sehingga dapat membantu mengatasi permasalahan pengolahan limbah menjadi material baru yang lebih bermanfaat.
Measuring CD Pit Spacing with a Laser: Applying Fundamental Physics Principles and the Diffraction Grating Method Naufal, Muhammad Risyad; Rodhiyah, Marathur
Schrödinger: Journal of Physics Education Vol. 6 No. 4 (2025): December
Publisher : Cahaya Ilmu Cendekia Publisher

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.37251/sjpe.v6i4.2281

Abstract

Purpose of the study: This study aimed to measure the distance between data pits on a Compact Disc (CD) by utilizing its reflective surface as a diffraction grating. When a laser beam strikes the CD, the alternating pits and lands create a diffraction pattern of bright and dark fringes. The pit spacing can then be determined from this pattern and compared with literature values. Methodology: A red laser was used as the light source, and the resulting diffraction pattern was analyzed using simple Python code based on the diffraction principle. This approach provides an efficient and low-cost method to perform quantitative analysis using readily available tools. Main Findings: The measured distance between pits on the Compact Disc was 1.607 ± 0.017 µm, with an accuracy error of 0.004%. The results closely matched reported literature values, though slight deviations may have arisen from parallax errors, the difficulty of identifying the laser’s exact reflection point, or ruler precision. From these results, it can be seen that a simple basic physics experiment can easily performed by students because the equipment and procedures are simple yet still produce good results. Novelty/Originality of this study: This work demonstrates that meaningful physics experiments can be conducted with everyday materials and simple instruments, offering a time- and cost-efficient way to explore fundamental concepts such as diffraction. The study highlights the potential of using familiar objects like compact discs to make physics learning more engaging and accessible for students and young researchers.
Co-Authors Arandi, Tyas Al Cahyati, Nilam Edikresnha, Dhewa Hapidin, Dian Ahmad Khairurrijal khairurrijal Luthfianti, Halida Rahmi Nafisah, Nur’aini Naufal, Muhammad Risyad Nur'Aini, Siti Waresindo, William Xaveriano Yuan Alfinsyah Sihombing