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All Journal Jurnal Ilmu Lingkungan Jurnal Penelitian Pendidikan IPA (JPPIPA) Journal of Physics and Its Applications Jurnal Ilmu Fisika UPEJ Unnes Physics Education Journal PRIMA: Journal of Community Empowering and Services Jurnal Fisika Indonesia Indonesian Journal of Electrical Engineering and Computer Science Physics Communication Airlangga Journal of Innovation Management Jurnal Pengabdian Masyarakat Bhinneka Jurnal Pemberdayaan Masyarakat Jurnal Pengabdian Masyarakat Bangsa Proceeding of International Conference on Humanity Education and Society
Lita Rahmasari
Universitas Sebelas Maret
Agriculture, Biological Sciences & Forestry Arts Humanities Astronomy Biochemistry, Genetics & Molecular Biology Chemical Engineering, Chemistry & Bioengineering Chemistry Civil Engineering, Building, Construction & Architecture Computer Science & IT Earth & Planetary Sciences Economics, Econometrics & Finance Education Energy Environmental Science Health Professions Industrial & Manufacturing Engineering Languange, Linguistic, Communication & Media Law, Crime, Criminology & Criminal Justice Materials Science & Nanotechnology Mathematics Medicine & Pharmacology Nursing Physics Public Health Social Sciences Other

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Instalasi Mesin Generator Ozon dalam Meningkatkan Kualitas Sayur Organik di Desa Gedangan - Boyolali Fanny Widadie; Nughtoh Arfawi Kurdhi; Lita Rahmasari
PRIMA: Journal of Community Empowering and Services Vol 7, No 1 (2023): June
Publisher : Universitas Sebelas Maret

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.20961/prima.v7i1.67370

Abstract

Installation of an Ozone Generator Machine to Improve the Quality of Organic Vegetables in Gedangan Village - Boyolali. The Utomo Jayan Farmers Group is an organic vegetable farmer group in Gedangan Village, Cepogo District, Boyolali Regency which has a major problem: the quality of vegetables. The vegetables produced by the group are quickly damaged, and many are returned by partners (buyers) due to needing to meet quality. The main purpose of this service activity is to assist in adopting post-harvest technology as an ozone generator to improve the quality of vegetables. Ozone technology can increase the shelf life of vegetables, prevent vegetables from spoiling quickly, reduce pesticide residues and harmful chemicals in the vegetables. The method of community service was conducted by socialization and active participation by involving all members of the farmer group. The results of this service activity were able to increase the shelf life of fresher vegetables within 20 days (red chilies), 14 days (tomatoes), 7 days (scallions), celery (9 days), and broccoli (5 days).
Eco-Friendly Sol-Gel Synthesis of Silver Nanoparticles using Morinda citrifolia Leaf Extract and PVP: Structural, Morphological and Antibacterial Properties Kiranda Dinata; Shinta Wulan Asih; Lita Rahmasari
Jurnal Ilmu Fisika Vol 18 No 2 (2026): September 2026
Publisher : Jurusan Fisika FMIPA Universitas Andalas

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.25077/jif.18.2.129-144.2026

Abstract

Silver nanoparticles (AgNPs) have strong potential as antibacterial agents, with effectiveness highly influenced by particle-size stability. This study synthesized AgNPs via a green sol-gel method using noni (Morinda citrifolia) leaf extract as a natural reducing agent and polyvinylpyrrolidone (PVP) as a capping agent. PVP concentrations of 0.5, 1.0, and 1.5 g were mixed with 25 mL noni extract and 25 mL double-distilled water. Characterization using UV–vis, XRD, FE-SEM/EDX, and FTIR showed decreasing UV–vis absorption peaks of 433, 412, 368 nm with increasing PVP content. XRD confirmed a face-centered cubic (FCC) crystal structure with >80% similarity to standard Ag patterns. FE-SEM/EDX indicated the presence of Ag, C, and O elements, and particle sizes remained stable at 16.8, 18.8, and 18.4 nm. The 0.5 g PVP sample produced the smallest particles and showed dominant O–H and C–H functional groups. It exhibited the strongest antibacterial activity, with inhibition zones of 12.5 mm (E. coli) and 12.0 mm (S. aureus). These results demonstrate that eco-friendly sol-gel-synthesized AgNPs using noni leaf extract and PVP exhibit promising antibacterial activity, positioning them as potential candidates for further development as antibacterial materials.
Green Synthesis of Silver Nanoparticles using Black Betel Leaf Extract with Polyvinyl Alcohol and Its Antibacterial Activity Lita Rahmasari; Iftitahul Khoiriyah; Jezzy Puspa Ayu Wardani; Dimas Rahadian Aji Muhammad
Journal of Physics and Its Applications Vol 8, No 3 (2026): August 2026
Publisher : Diponegoro University Semarang Indonesia

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.14710/jpa.v8i3.32197

Abstract

Black betel leaf extract contains reducing agents like flavonoids, which can reduce the size of silver particles to nanoscale. Meanwhile, Polyvinyl alcohol (PVA) is used to prevent the agglomeration of silver nanoparticles (AgNPs). This study aimed to determine the antibacterial activity of AgNPs synthesized from black betel leaf extract and PVA against Staphylococcus aureus and Escherichia coli bacteria. PVA was varied at concentrations of 0.5 g, 1 g, and 1.5 g in 25 mL of deionized water, which was then mixed with 25 mL of black betel leaf extract. AgNPs were produced through a green synthesis process using the sol-gel technique, involving extraction, synthesis, characterization, and data analysis. The resulting AgNPs were stable across variations in polymer mass, with maximum wavelength absorption ranging from 403 nm to 440 nm. Analysis showed that the AgNPs possessed a Face Centered Cubic (FCC) crystal structure with particle sizes between 12.4 nm and 14.7 nm. Furthermore, the AgNPs were surrounded by various organic molecules such as terpenoids, alcohols, ketones, aldehydes, and carboxylic acids. The most potent antibacterial nanoparticles were the AgNPs synthesized with 0.5 grams of PVA. These AgNPs demonstrated an inhibition zone of 13.9 mm against Escherichia coli and 11.3 mm against Staphylococcus aureus.
Development of an Inquiry-Based Physics Laboratory Module Integrating a Traditional Catapult for Teaching Energy Conservation Alvina Neratania; Lita Rahmasari; Sarwanto Sarwanto

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Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.46843/jpm.v5i3.855

Abstract

Direct formula-based instruction in physics often limits students' engagement in conceptual discovery and the development of their mathematical, scientific, and literacy skills. The catapult, as a traditional game, has the potential to serve as a contextual learning medium that illustrates physics concepts. This project seeks to create an inquiry-based physics laboratory module that incorporates the traditional catapult game to teach the law of conservation of energy, evaluate its feasibility, and analyze its applicability for 10th-grade students. This study utilizes a Research and Development methodology grounded in the Cennamo and Kalk model, encompassing the steps of definition, design, demonstration, development, and delivery. The result is a printed laboratory module that combines inquiry activities with local cultural contexts. The feasibility test findings were analyzed by professionals using Aiken's V, while practicality was evaluated through student response questionnaires. The findings reveal that the module demonstrated significant validity, as evidenced by an Aiken's V score exceeding the minimal permissible threshold, and considerable practicality. This module supports students in exploring the concept of energy conservation through inquiry-based experiments while promoting cultural literacy. Therefore, the developed module can serve as an innovative and relevant learning resource for students.
Co-Authors Abdul Ngalimus Salam Alvina Neratania Anif Jamaluddin Arifa, Aulia Dewanto Harjunowibowo Dimas Rahadian Aji Muhammad Dwi Putri Sabariasih, Dwi Putri Dwi Teguh Rahardjo Dwi Teguh Rahardjo Dyah Puspitasari Elvin Yusliana Ekawati Eunike Friska Defvi Fanny Widadie Fita Listiana Henny Setyaningsih, Henny Iftitahul Khoiriyah Ike Yuliastuti Jamzuri Jamzuri Jezzy Puspa Ayu Wardani Kiranda Dinata Mahardika, Dimas Pandu Mira Ayu Rahmawati Muhammad Khairul Annam Najahy Najahy Nidya Chitraningrum Nughtoh Arfawi Kurdhi Nugroho, Lilik Andre Nugroho, Panji Setyo Oktaberliana, Dyah Wahyu Prasetyawati, Farah Yuki Putri Syntia Monika Riyatun - Sarwanto Sarwanto Sarwanto Sarwanto Shinta Wulan Asih Sri Budiawanti Suharno Suharno Suharno Suharno Sukarmin Supurwoko Syamsuddin, Frendi Ihwan Ulwan, Rozin Fata Umi Muslikhah, Umi Wahyudi Nandana Munte Widha Sunarno Yulianto Agung Rezeki