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All Journal HAYATI Journal of Biosciences Reaktor Medical Journal of Indonesia Rekayasa Mesin Journal of Medical Physics and Biophysics Agrokreatif Jurnal Ilmiah Pengabdian kepada Masyarakat Science and Technology Indonesia Spektra: Jurnal Fisika dan Aplikasinya Indonesian Journal of Pure and Applied Chemistry Jurnal Teknik Pertanian Lampung (Journal of Agricultural Engineering) Jurnal Ilmu Fisika Jurnal Jamu Indonesia Indonesian Physical Review JURNAL Al-AZHAR INDONESIA SERI SAINS DAN TEKNOLOGI Jurnal Sains Materi Indonesia Indonesian Journal of Jamu
Yessie Widya Sari
Department Of Physic, Faculty Of Mathematics And Natural Sciences, IPB University, Bogor, Indonesia; Tropical Biopharmaca Research Center, IPB University, Bogor, Indonesia
Aerospace Engineering Agriculture, Biological Sciences & Forestry Astronomy Biochemistry, Genetics & Molecular Biology Chemical Engineering, Chemistry & Bioengineering Chemistry Computer Science & IT Control & Systems Engineering Earth & Planetary Sciences Education Electrical & Electronics Engineering Energy Engineering Environmental Science Health Professions Industrial & Manufacturing Engineering Materials Science & Nanotechnology Mechanical Engineering Medicine & Pharmacology Physics Public Health Other

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High-Concentration Synthesis of Ligand-Free Au and Ag Nanoparticles by Nanosecond Laser Ablation and Their Conversion to Au–Ag Alloy Nanoparticles via Femtosecond Laser Processing Siti Masyithah; Muhandis Shiddiq; Yessie Widya Sari
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.18.2.145-157.2026

Abstract

A laser processing strategy is presented for the high-concentration synthesis of ligand-free Au, Ag, and Au–Ag alloy nanoparticles. Monometallic Au and Ag nanoparticles were first synthesized independently by nanosecond pulsed laser ablation in liquid (PLAL), producing stable ligand-free colloids. The Au and Ag colloids were then mixed in an equimolar ratio and irradiated with femtosecond laser pulses to induce alloy formation without chemical stabilizers or reducing agents. Ultraviolet–visible (UV–vis) spectroscopy shows a single localized surface plasmon resonance peak that shifts from 400 nm (Ag) to 509 nm (Au), with the Au–Ag alloy peak located between the two, confirming alloy formation. Transmission electron microscopy (TEM) reveals spherical Au, Au–Ag alloy, and Ag nanoparticles with average diameters of 11.8 ± 8.1 nm, 18.8 ± 5.9 nm, and 20.3 ± 9.4 nm, respectively, with the alloy nanoparticles exhibiting a narrower size distribution. Zeta potential measurements of −36.4, −41.2, and −48.1 mV for Ag, Au, and Au–Ag nanoparticles indicate good colloidal stability, with the alloy nanoparticles showing the highest stability. This laser-based approach provides a chemical-free route for producing high-concentration noble metal and alloy nanoparticles with tunable plasmonic and colloidal properties.
Acoustic Panel from Coconut Fiber and Spent Coffee Ground as Sound-Absorbing Material for Sustainability Yessie Widya Sari; Pristy Nabila; Salsabilla Bayah; Annisa Azahra; Rohul Hartman; Angga Saputra
JURNAL Al-AZHAR INDONESIA SERI SAINS DAN TEKNOLOGI Vol. 11 No. 3 (2026): September 2026
Publisher : Universitas Al Azhar Indonesia

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.36722/sst.v11i3.5753

Abstract

  Conventional building materials are energy-intensive and generate substantial waste, motivating the valorization of agricultural by products into sustainable acoustic materials. This study developed an acoustic panel from Coconut Fiber (CF) and Spent Coffee Grounds (SCG) bound with a cassava starch-based adhesive, with SCG incorporated at 0%, 15%, and 30% (samples A1, A2, and A3, respectively). SCG addition increased panel density from 208.9 kg/m3 (A1) to 247.5 and 268.7 kg/m3 for A2 and A3. Tensile testing showed that SCG reduced the maximum stress while increasing the Young's modulus, indicating a trade-off between ductility and stiffness. Scanning electron microscopy revealed that SCG particles bridged the coconut fiber network, altering the pore structure and air-flow resistivity. Sound absorption coefficients measured across 250-5000 Hz using the impedance tube method showed that A2 (85% CF, 15% SCG) achieved the best overall performance, reaching coefficients of 0.86 at 500 Hz and 0.69 at 250 Hz and outperforming A1 and A3, particularly at low-to-mid frequencies. Excessive SCG in A3 reduced absorption due to increased density and reduced porosity. These findings demonstrate that CF-SCG composite panels are a promising, low-cost, biobased alternative to conventional acoustic materials and SCG for balancing sound absorption performance with sustainable resource valorization.
Correlation between Time Variation of Steam Distillation of Temu Hitam’s Rhizomes (Curcuma aeruginosa) and Antibacterial Activity of Essential Oil Fauziyatul Munawaroh; Widya Luthfiana; Irma Herawati Suparto; Yessie Widya Sari; Wulan Tri Wahyuni; Irmanida Batubara
Jurnal Jamu Indonesia Vol. 8 No. 3 (2023): Jurnal Jamu Indonesia
Publisher : Tropical Biopharmaca Research Center, IPB University

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.29244/jji.v8i3.345

Abstract

Distillation time can affect the extraction of essential oils such as the rhizome of temu hitam (Curcuma aeruginosa) which has been shown to have antibacterial activity. Therefore, this study aims to determine the optimum distillation time to produce temu hitam rhizome oil with the strongest antibacterial activity. The rhizomes of temu hitam were steam distilled with different length of time every 30 minutes for 4 hours to obtain essential oil and determined the compounds contained in them using gas chromatography-mass spectrometry. Antibacterial activity was determined by disc diffusion against Streptococcus mutans, Escherichia coli, and Staphylococcus aureus. The most dominant compounds present in essential oils are eucalyptol (34.89%), epicurzerenone (20.58%), and camphor (16.90%) based on the average peak of the total distillation time. The strongest antibacterial potency was obtained in the first 30 minutes of distillation for S. mutans and E. coli, and in the seventh 30 minutes of distillation for S. aureus.
Co-Authors Abdurrahman Bahtiar Agus Sukarto Wismogroho Agus Sukarto Wismogroho, Agus Sukarto Ahmed, Ifty Akhiruddin Maddu Akmal, Raihan Muhammad Aminatun Aminuddin Aminuddin Angga Saputra Angga Saputra Annisa Azahra Aprilianda, Aprilianda Aribah, Putri Arief Boediono Ary Mauliva Hada Putri Attar, Zia Rausyanfikr Azahra, Annisa Nur Bambang Sugeng Bayah, Salsabilla Permata Berry Juliandi Budiman, Ismail Cahayadi, Sigit Daru Charlena Cherly Firdharini Christina Winarti Dani Indrawati Berlianingtyas Dase Hunaefi Desi Alifia Putri Dimyati , Arbi Djaja Surya Atmadja Djarwani S. Soejoko Djarwani Soeharso Soejoko Dwi Seno Kuncoro Sihono Edi Supriadi Efriyana Kampai Elbersen, Wolter Faleh Setia Budi Fauji, Muhamad Iqbal Fauziyatul Munawaroh Firdharini, Cherly Gunawarman Hendrawan Laksono Husin Alatas Ibrahim Purawiardi Ilham Akbar Ibrahim Irma Herawati Suparto Irmanida Batubara Jayadi Jayadi Joni Prasetyo Julia, Siti Kiagus Dahlan laela Sari, laela Lubis, Lukmanda Evan Luthfiana, Widya Mersi Kurniati Mohamad Ikbal Hidayah Mohamad, Che Wan Sharifah Robiah Muhandis Shiddiq Muhdarina Munawaroh, Fauziyatul Munir, Ryaas Mishbachul Nabila, Pristy Tasya Noviani Rustanto Nurhayati, Retno Wahyu Nurizati Nurizati Nuzulia, Nur Aisyah Prima Zuldian Pristy Nabila Purawiardi , Ibrahim Raihan Muhammad Akmal Reza Pahlevi Rudianto Riano, Riza Rina Mardiana Rohul Hartman Rohul Rizki Mubaroq Hartman Salsabilla Bayah Sari, Mona Savitri Damayanti Serin Imsa Arizuni Setia Utami Dewi Sharly Claudia Alghai Sani Siti Masyithah Sulistioso Giat Sukaryo Sulistioso Giat Sukaryo, Sulistioso Giat Tanti Ardiyati Tri Suciati Wahyu Bambang Widayatno Wahyu Bambang Widayatno, Wahyu Bambang Widya Luthfiana Widyarani, Widyarani Wulan Islamia Wulan Tri Wahyuni Yusril Yusuf Yusril Yusuf Zahra Firda Santoso