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All Journal Journal of Mathematical and Fundamental Sciences Makara Journal of Science JPM-AKA
Foliatini Foliatini
Department of Chemistry, Faculty of Mathematics and Natural Sciences, Universitas Indonesia, Depok 16424, Indonesia
Astronomy Chemistry Earth & Planetary Sciences Mathematics Physics Social Sciences

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The Synthesis of Alginate-Capped Silver Nanoparticles under Microwave Irradiation Foliatini Foliatini; Yoki Yulizar; Mas Ayu Elita Hafizah
Journal of Mathematical and Fundamental Sciences Vol. 47 No. 1 (2015)
Publisher : Institute for Research and Community Services (LPPM) ITB

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.5614/j.math.fund.sci.2015.47.1.3

Abstract

Synthesis of silver nanoparticles (Ag-NP) was successfully performed within a few minutes by microwave irradiation of the precursor salt (AgNO3) and alginate mixed solution in one pot. Herein, alginate molecules acted as both a reducing and stabilizing agent for the preparation of the silver nanoparticles. The obtained nanoparticles were characterized by ultraviolet-visible (UV-Vis) spectroscopy, particle size analysis (PSA), Fourier transform infrared spectroscopy (FTIR), and transmission electron microscopy (TEM). The pH and concentration ratio of the alginate/metal precursor salt greatly influenced the particle size and its distribution of Ag-NP. The higher the pH the higher the nucleation rate and the larger the electrostatic stabilization, while both of them were responsible for producing a smaller particle size and a narrower size distribution. A higher concentration ratio also yielded a smaller particle size and a narrower size distribution, but above the optimum ratio, the trend was conversely changed due to the reducing capability of the alginate, which was dominant above the optimum ratio, thus creating a high density of nuclei, allowing aggregation to occur. A lower ratio not only led to a higher tendency to produce larger particles, but also a higher probability of anisotropic particle shape formation due to the lack of reducing capability of the alginates.
Microwave-Assisted Synthesis of Alginate-Stabilized Gold Nanoparticles Foliatini, Foliatini; Yulizar, Yoki; Hafizah, Mas Ayu Elita
Makara Journal of Science Vol. 18, No. 4
Publisher : UI Scholars Hub

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during boreal summer to fall 2011. In this study, data from satellite observations and atmospheric reanalysis datasets
Polyvinyl Alcohol–Red Cabbage Nanofibers as pH-Responsive Freshness Sensors for Advanced Food Packaging Technology Foliatini, Foliatini; Wibowo, Singgih; Rochaeni, Henny; Suhartini, Suhartini; Fachrurrazie, Fachrurrazie; Prianditya, Arzzaq Imanda; Hadriansyah, Pradnadia Putri; Siregar, Naura Athira Putri; Nurpadilah, Novi; Alfiani, Putri; Rahim, Maudi; Sriwahyuni, Endah
Makara Journal of Science Vol. 28, No. 3
Publisher : UI Scholars Hub

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The development of innovative food packaging technologies, particularly those capable of monitoring freshness, has become increasingly important in the food industry. This research explores the development of a pH-responsive freshness sensor using polyvinyl alcohol–red cabbage (PVA/RC) nanofibers. The nanofibers are fabricated through the electrospinning technique and meticulously analyzed via scanning electron microscopy, Fourier-transform infrared (FTIR) spectroscopy, and differential scanning calorimetry (DSC). The results underscore the fine structure of the nanofiber matrix, with an average diameter of ~68 nm. FTIR analysis substantiates the presence of anthocyanin compounds from RC within the PVA/RC nanofibers, which confirms the integration of beneficial components into the nanofiber matrix. Moreover, DSC investigations reveal the outstanding thermal properties of PVA/RC, which demonstrates the resilience of the nanofibers to higher temperatures, with a melting point of ~223 °C. Notably, the PVA/RC nanofibers with a 3:1 ratio exhibit excellent thermal stability, although the color change due to pH fluctuations shifts toward transparency. This study lays down the foundation for future exploration and the potential for a diverse array of applications and material enhancements. The findings presented herein open up new opportunities for the use of PVA/RC nanofibers in the development of freshness sensors, heralding a new era in smart food packaging technology.
Pelatihan Penggunaan Alat Pemantau dan Pengontrol Suhu dan Kelembapan Berbasis Teknologi 4.0 di IKM Iman Batik Cirebon Foliatini, Foliatini; Rochaeni, Henny; Setyawati, Sri Redjeki; Nurdiani, Nurdiani; Aziz, Ilyas Taufik Abdul
Jurnal Pengabdian Masyarakat AKA Vol 4, No 1 (2024): Juni 2024
Publisher : Politeknik AKA Bogor

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.55075/jpm-aka.v4i1.231

Abstract

Kegiatan pengabdian kepada masyarakat (PKM) telah dilaksanakan di IKM Iman Batik Cirebon. Tujuan PKM adalah memberikan pengetahuan dan keterampilan tambahan kepada pelaku IKM Iman Batik terkait penggunaan alat pemantau dan pengontrol suhu dan kelembapan berbasis teknologi 4.0. Pelaksanaan kegiatan PKM diawali dengan survei pendahuluan untuk mengetahui permasalahan. Selanjutnya dilakukan sosialisasi dan pelatihan penggunaan alat pemantau dan pengontrol suhu dan kelembapan. Tahap terakhir kegiatan adalah evaluasi hasil kegiatan PKM. Kegiatan PKM menghasilkan alat pemantau dan pengontrol suhu dan kelembapan berbasis teknologi 4.0 yang dapat menyala secara otomatis saat kelembapan ruangan di atas 52% dan suhu ruangan di bawah 25 oC. Berdasarkan hasil kuisoner, kegiatan pelatihan yang telah dilakukan mendapatkan respon positif dan memberikan manfaat kepada IKM Iman Batik Cirebon.
Co-Authors Alfiani, Putri Aziz, Ilyas Taufik Abdul Fachrurrazie, Fachrurrazie Hadriansyah, Pradnadia Putri Mas Ayu Elita Hafizah Nurdiani Nurdiani, Nurdiani Nurpadilah, Novi Prianditya, Arzzaq Imanda Rahim, Maudi Rochaeni, Henny Setyawati, Sri Redjeki Singgih Wibowo, Singgih Siregar, Naura Athira Putri Sriwahyuni, Endah Suhartini Suhartini Yoki Yulizar Yoki Yulizar